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Posted to commits@thrift.apache.org by je...@apache.org on 2015/10/09 22:06:03 UTC

[6/7] thrift git commit: THRIFT-2905 Cocoa compiler should have option to produce "modern" Objective-C Client: Cocoa (ObjectiveC & Swift) Author: Kevin Wooten

http://git-wip-us.apache.org/repos/asf/thrift/blob/56e5b9b0/compiler/cpp/src/generate/t_cocoa_generator.cc
----------------------------------------------------------------------
diff --git a/compiler/cpp/src/generate/t_cocoa_generator.cc b/compiler/cpp/src/generate/t_cocoa_generator.cc
index a90c937..f8924bb 100644
--- a/compiler/cpp/src/generate/t_cocoa_generator.cc
+++ b/compiler/cpp/src/generate/t_cocoa_generator.cc
@@ -59,7 +59,16 @@ public:
 
     iter = parsed_options.find("async_clients");
     async_clients_ = (iter != parsed_options.end());
-
+      
+    iter = parsed_options.find("promise_kit");
+    promise_kit_ = (iter != parsed_options.end());
+      
+    iter = parsed_options.find("debug_descriptions");
+    debug_descriptions_ = (iter != parsed_options.end());
+    
+    iter = parsed_options.find("pods");
+    pods_ = (iter != parsed_options.end());
+      
     out_dir_base_ = "gen-cocoa";
   }
 
@@ -108,11 +117,13 @@ public:
   void generate_cocoa_struct_encode_with_coder_method(ofstream& out,
                                                       t_struct* tstruct,
                                                       bool is_exception);
+  void generate_cocoa_struct_copy_method(ofstream& out,
+                                         t_struct* tstruct,
+                                         bool is_exception);
   void generate_cocoa_struct_hash_method(ofstream& out, t_struct* tstruct);
-  void generate_cocoa_struct_is_equal_method(ofstream& out, t_struct* tstruct);
-  void generate_cocoa_struct_field_accessor_declarations(std::ofstream& out,
-                                                         t_struct* tstruct,
-                                                         bool is_exception);
+  void generate_cocoa_struct_is_equal_method(ofstream& out,
+                                             t_struct* tstruct,
+                                             bool is_exception);
   void generate_cocoa_struct_field_accessor_implementations(std::ofstream& out,
                                                             t_struct* tstruct,
                                                             bool is_exception);
@@ -122,9 +133,9 @@ public:
   void generate_cocoa_struct_validator(std::ofstream& out, t_struct* tstruct);
   void generate_cocoa_struct_description(std::ofstream& out, t_struct* tstruct);
 
-  std::string function_result_helper_struct_type(t_function* tfunction);
-  std::string function_args_helper_struct_type(t_function* tfunction);
-  void generate_function_helpers(t_function* tfunction);
+  std::string function_result_helper_struct_type(t_service *tservice, t_function* tfunction);
+  std::string function_args_helper_struct_type(t_service* tservice, t_function* tfunction);
+  void generate_function_helpers(t_service *tservice, t_function* tfunction);
 
   /**
    * Service-level generation functions
@@ -137,10 +148,17 @@ public:
   void generate_cocoa_service_client_async_interface(std::ofstream& out, t_service* tservice);
 
   void generate_cocoa_service_client_send_function_implementation(ofstream& out,
-                                                                  t_function* tfunction);
+                                                                  t_service* tservice,
+                                                                  t_function* tfunction,
+                                                                  bool needs_protocol);
   void generate_cocoa_service_client_send_function_invocation(ofstream& out, t_function* tfunction);
+  void generate_cocoa_service_client_send_async_function_invocation(ofstream& out,
+                                                                    t_function* tfunction,
+                                                                    string failureBlockName);
   void generate_cocoa_service_client_recv_function_implementation(ofstream& out,
-                                                                  t_function* tfunction);
+                                                                  t_service* tservice,
+                                                                  t_function* tfunction,
+                                                                  bool needs_protocol);
   void generate_cocoa_service_client_implementation(std::ofstream& out, t_service* tservice);
   void generate_cocoa_service_client_async_implementation(std::ofstream& out, t_service* tservice);
 
@@ -194,18 +212,25 @@ public:
   std::string cocoa_prefix();
   std::string cocoa_imports();
   std::string cocoa_thrift_imports();
-  std::string type_name(t_type* ttype, bool class_ref = false);
+  std::string type_name(t_type* ttype, bool class_ref = false, bool needs_mutable = false);
   std::string base_type_name(t_base_type* tbase);
-  std::string declare_field(t_field* tfield);
   std::string declare_property(t_field* tfield);
-  std::string function_signature(t_function* tfunction);
-  std::string async_function_signature(t_function* tfunction);
-  std::string argument_list(t_struct* tstruct);
+  std::string declare_property_isset(t_field* tfield);
+  std::string declare_property_unset(t_field* tfield);
+  std::string invalid_return_statement(t_function* tfunction);
+  std::string function_signature(t_function* tfunction, bool include_error);
+  std::string async_function_signature(t_function* tfunction, bool include_error);
+  std::string promise_function_signature(t_function* tfunction);
+  std::string argument_list(t_struct* tstruct, string protocol_name, bool include_error);
   std::string type_to_enum(t_type* ttype);
   std::string format_string_for_type(t_type* type);
+  std::string format_cast_for_type(t_type* type);
   std::string call_field_setter(t_field* tfield, std::string fieldName);
   std::string containerize(t_type* ttype, std::string fieldName);
   std::string decontainerize(t_field* tfield, std::string fieldName);
+  std::string decontainerize(t_type* ttype, std::string fieldName);
+  std::string getter_name(string field_name);
+  std::string setter_name(string field_name);
 
   bool type_can_be_null(t_type* ttype) {
     ttype = get_true_type(ttype);
@@ -217,6 +242,7 @@ public:
 private:
   std::string cocoa_prefix_;
   std::string constants_declarations_;
+  int error_constant_;
 
   /**
    * File streams
@@ -228,6 +254,9 @@ private:
   bool log_unexpected_;
   bool validate_required_;
   bool async_clients_;
+  bool promise_kit_;
+  bool debug_descriptions_;
+  bool pods_;
 };
 
 /**
@@ -240,7 +269,7 @@ void t_cocoa_generator::init_generator() {
   cocoa_prefix_ = program_->get_namespace("cocoa");
 
   // we have a .h header file...
-  string f_header_name = program_name_ + ".h";
+  string f_header_name = cocoa_prefix_ + capitalize(program_name_) + ".h";
   string f_header_fullname = get_out_dir() + f_header_name;
   f_header_.open(f_header_fullname.c_str());
 
@@ -249,13 +278,16 @@ void t_cocoa_generator::init_generator() {
   f_header_ << cocoa_imports() << cocoa_thrift_imports();
 
   // ...and a .m implementation file
-  string f_impl_name = get_out_dir() + program_name_ + ".m";
-  f_impl_.open(f_impl_name.c_str());
+  string f_impl_name = cocoa_prefix_ + capitalize(program_name_) + ".m";
+  string f_impl_fullname = get_out_dir() + f_impl_name;
+  f_impl_.open(f_impl_fullname.c_str());
 
   f_impl_ << autogen_comment() << endl;
 
   f_impl_ << cocoa_imports() << cocoa_thrift_imports() << "#import \"" << f_header_name << "\""
           << endl << endl;
+  
+  error_constant_ = 60000;
 }
 
 /**
@@ -273,25 +305,52 @@ string t_cocoa_generator::cocoa_imports() {
  * @return List of imports necessary for thrift runtime
  */
 string t_cocoa_generator::cocoa_thrift_imports() {
-  string result = string() + "#import \"TProtocol.h\"\n" + "#import \"TApplicationException.h\"\n"
-                  + "#import \"TProtocolException.h\"\n" 
-                  + "#import \"TProtocolUtil.h\"\n"
-                  + "#import \"TProcessor.h\"\n" 
-                  + "#import \"TObjective-C.h\"\n"
-                  + "#import \"TBase.h\"\n"
-                  + "#import \"TAsyncTransport.h\"\n"
-                  + "#import \"TProtocolFactory.h\"\n"
-                  + "#import \"TBaseClient.h\"\n" 
-                  + "\n";
+
+  vector<string> includes_list;
+  includes_list.push_back("TProtocol.h");
+  includes_list.push_back("TProtocolFactory.h");
+  includes_list.push_back("TApplicationError.h");
+  includes_list.push_back("TProtocolError.h");
+  includes_list.push_back("TProtocolUtil.h");
+  includes_list.push_back("TProcessor.h");
+  includes_list.push_back("TBase.h");
+  includes_list.push_back("TAsyncTransport.h");
+  includes_list.push_back("TBaseClient.h");
+
+  std::ostringstream includes;
+
+  vector<string>::const_iterator i_iter;
+  for (i_iter=includes_list.begin(); i_iter!=includes_list.end(); ++i_iter) {
+    includes << "#import ";
+    if (pods_) {
+      includes << "<Thrift/" << *i_iter << ">";
+    } else {
+      includes << "\"" << *i_iter << "\"";
+    }
+    includes << endl;
+  }
+  
+  includes << endl;
+  
+  if (promise_kit_) {
+    includes << "#import ";
+    if (pods_) {
+      includes << "<PromiseKit/PromiseKit.h>";
+    } else {
+      includes << "\"PromiseKit.h\"";
+    }
+    includes << endl;
+  }
 
   // Include other Thrift includes
-  const vector<t_program*>& includes = program_->get_includes();
-  for (size_t i = 0; i < includes.size(); ++i) {
-    result += "#import \"" + includes[i]->get_name() + ".h\"" + "\n";
+  const vector<t_program*>& other_includes = program_->get_includes();
+  for (size_t i = 0; i < other_includes.size(); ++i) {
+    includes << "#import \"" << other_includes[i]->get_name() << ".h\"" << endl;
   }
-  result += "\n";
+  
+  includes << endl;
 
-  return result;
+  return includes.str();
 }
 
 /**
@@ -309,20 +368,46 @@ void t_cocoa_generator::close_generator() {
  * @param ttypedef The type definition
  */
 void t_cocoa_generator::generate_typedef(t_typedef* ttypedef) {
+  if (ttypedef->get_type()->is_map()) {
+    t_map *map = (t_map *)ttypedef->get_type();
+    if (map->get_key_type()->is_struct()) {
+      f_header_ << indent() << "@class " << type_name(map->get_key_type(), true) << ";" << endl;
+    }
+    if (map->get_val_type()->is_struct()) {
+      f_header_ << indent() << "@class " << type_name(map->get_val_type(), true) << ";" << endl;
+    }
+  }
+  else if (ttypedef->get_type()->is_set()) {
+    t_set *set = (t_set *)ttypedef->get_type();
+    if (set->get_elem_type()->is_struct()) {
+      f_header_ << indent() << "@class " << type_name(set->get_elem_type(), true) << ";" << endl;
+    }
+  }
+  else if (ttypedef->get_type()->is_list()) {
+    t_list *list = (t_list *)ttypedef->get_type();
+    if (list->get_elem_type()->is_struct()) {
+      f_header_ << indent() << "@class " << type_name(list->get_elem_type(), true) << ";" << endl;
+    }
+  }
   f_header_ << indent() << "typedef " << type_name(ttypedef->get_type()) << " " << cocoa_prefix_
             << ttypedef->get_symbolic() << ";" << endl << endl;
+  if (ttypedef->get_type()->is_container()) {
+    f_header_ << indent() << "typedef " << type_name(ttypedef->get_type(), false, true) << " " << cocoa_prefix_
+              << "Mutable" << ttypedef->get_symbolic() << ";" << endl << endl;
+  }
 }
 
 /**
  * Generates code for an enumerated type. In Objective-C, this is
- * essentially the same as the thrift definition itself, using the
- * enum keyword in Objective-C.  For namespace purposes, the name of
- * the enum plus an underscore is prefixed onto each element.
+ * essentially the same as the thrift definition itself, instead using
+ * NS_ENUM keyword in Objective-C.  For namespace purposes, the name of
+ * the enum is prefixed to each element in keeping with Cocoa & Swift
+ * standards.
  *
  * @param tenum The enumeration
  */
 void t_cocoa_generator::generate_enum(t_enum* tenum) {
-  f_header_ << indent() << "enum " << cocoa_prefix_ << tenum->get_name() << " {" << endl;
+  f_header_ << indent() << "typedef NS_ENUM(SInt32, " << cocoa_prefix_ << tenum->get_name() << ") {" << endl;
   indent_up();
 
   vector<t_enum_value*> constants = tenum->get_constants();
@@ -334,7 +419,7 @@ void t_cocoa_generator::generate_enum(t_enum* tenum) {
     } else {
       f_header_ << "," << endl;
     }
-    f_header_ << indent() << tenum->get_name() << "_" << (*c_iter)->get_name();
+    f_header_ << indent() << cocoa_prefix_ << tenum->get_name() << (*c_iter)->get_name();
     f_header_ << " = " << (*c_iter)->get_value();
   }
 
@@ -343,36 +428,63 @@ void t_cocoa_generator::generate_enum(t_enum* tenum) {
 }
 
 /**
- * Generates a class that holds all the constants.  Primitive values
- * could have been placed outside this class, but I just put
- * everything in for consistency.
+ * Generates a class that holds all the constants.
  */
 void t_cocoa_generator::generate_consts(std::vector<t_const*> consts) {
   std::ostringstream const_interface;
-  string constants_class_name = cocoa_prefix_ + program_name_ + "Constants";
 
-  const_interface << "@interface " << constants_class_name << " : NSObject ";
-  scope_up(const_interface);
-  scope_down(const_interface);
+  const_interface << "FOUNDATION_EXPORT NSString *" << cocoa_prefix_ << capitalize(program_name_) << "ErrorDomain;" << endl
+                  << endl;
+  
+
+  bool needs_class = false;
 
-  // getter method for each constant defined.
+  // Public constants for base types & strings
   vector<t_const*>::iterator c_iter;
   for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
-    string name = (*c_iter)->get_name();
     t_type* type = (*c_iter)->get_type();
-    const_interface << "+ (" << type_name(type) << ") " << name << ";" << endl;
+    if (!type->is_container() && !type->is_struct()) {
+      const_interface << "FOUNDATION_EXPORT " << type_name(type) << " "
+                      << cocoa_prefix_ << capitalize((*c_iter)->get_name()) << ";" << endl;
+    }
+    else {
+      needs_class = true;
+    }
   }
+  
+  
+  string constants_class_name = cocoa_prefix_ + capitalize(program_name_) + "Constants";
+
+  if (needs_class) {
+
+    const_interface << "@interface " << constants_class_name << " : NSObject ";
+    scope_up(const_interface);
+    scope_down(const_interface);
 
-  const_interface << "@end";
+    // getter method for each constant defined.
+    for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
+      string name = (*c_iter)->get_name();
+      t_type* type = (*c_iter)->get_type();
+      if (type->is_container() || type->is_struct()) {
+        t_type* type = (*c_iter)->get_type();
+        const_interface << "+ (" << type_name(type) << ") " << name << ";" << endl;
+      }
+    }
+
+    const_interface << "@end";
+  }
 
   // this gets spit into the header file in ::close_generator
   constants_declarations_ = const_interface.str();
+  
+  f_impl_ << "NSString *" << cocoa_prefix_ << capitalize(program_name_) << "ErrorDomain = "
+          << "@\"" << cocoa_prefix_ << capitalize(program_name_) << "ErrorDomain\";" << endl << endl;
 
-  // static variables in the .m hold all constant values
+  // variables in the .m hold all simple constant values
   for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
     string name = (*c_iter)->get_name();
     t_type* type = (*c_iter)->get_type();
-    f_impl_ << "static " << type_name(type) << " " << cocoa_prefix_ << name;
+    f_impl_ << type_name(type) << " " << cocoa_prefix_ << name;
     if (!type->is_container() && !type->is_struct()) {
       f_impl_ << " = " << render_const_value(f_impl_, type, (*c_iter)->get_value());
     }
@@ -380,36 +492,40 @@ void t_cocoa_generator::generate_consts(std::vector<t_const*> consts) {
   }
   f_impl_ << endl;
 
-  f_impl_ << "@implementation " << constants_class_name << endl;
+  if (needs_class) {
+    f_impl_ << "@implementation " << constants_class_name << endl;
 
-  // initialize complex constants when the class is loaded
-  f_impl_ << "+ (void) initialize ";
-  scope_up(f_impl_);
+    // initialize complex constants when the class is loaded
+    f_impl_ << "+ (void) initialize ";
+    scope_up(f_impl_);
 
-  for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
-    if ((*c_iter)->get_type()->is_container() || (*c_iter)->get_type()->is_struct()) {
-      print_const_value(f_impl_,
-                        cocoa_prefix_ + (*c_iter)->get_name(),
-                        (*c_iter)->get_type(),
-                        (*c_iter)->get_value(),
-                        false,
-                        false);
-      f_impl_ << ";" << endl;
+    for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
+      if ((*c_iter)->get_type()->is_container() || (*c_iter)->get_type()->is_struct()) {
+        print_const_value(f_impl_,
+                          cocoa_prefix_ + (*c_iter)->get_name(),
+                          (*c_iter)->get_type(),
+                          (*c_iter)->get_value(),
+                          false,
+                          false);
+        f_impl_ << ";" << endl;
+      }
     }
-  }
-  scope_down(f_impl_);
-
-  // getter method for each constant
-  for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
-    string name = (*c_iter)->get_name();
-    t_type* type = (*c_iter)->get_type();
-    f_impl_ << "+ (" << type_name(type) << ") " << name;
-    scope_up(f_impl_);
-    indent(f_impl_) << "return " << cocoa_prefix_ << name << ";" << endl;
     scope_down(f_impl_);
-  }
 
-  f_impl_ << "@end" << endl << endl;
+    // getter method for each constant
+    for (c_iter = consts.begin(); c_iter != consts.end(); ++c_iter) {
+      string name = (*c_iter)->get_name();
+      t_type* type = (*c_iter)->get_type();
+      if (type->is_container() || type->is_struct()) {
+        f_impl_ << "+ (" << type_name(type) << ") " << name;
+        scope_up(f_impl_);
+        indent(f_impl_) << "return " << cocoa_prefix_ << name << ";" << endl;
+        scope_down(f_impl_);
+      }
+    }
+
+    f_impl_ << "@end" << endl << endl;
+  }
 }
 
 /**
@@ -441,51 +557,38 @@ void t_cocoa_generator::generate_xception(t_struct* txception) {
 void t_cocoa_generator::generate_cocoa_struct_interface(ofstream& out,
                                                         t_struct* tstruct,
                                                         bool is_exception) {
+  
+  if (is_exception) {
+    out << "enum {" << endl
+        << "  " << cocoa_prefix_ << capitalize(program_name_) << "Error" << tstruct->get_name() <<  " = -" << error_constant_++ << endl
+        << "};" << endl
+        << endl;
+  }
+  
   out << "@interface " << cocoa_prefix_ << tstruct->get_name() << " : ";
 
   if (is_exception) {
-    out << "NSException ";
+    out << "NSError ";
   } else {
     out << "NSObject ";
   }
-  out << "<TBase, NSCoding> ";
-
-  scope_up(out);
-
-  // members are protected.  this is redundant, but explicit.
-  //  f_header_ << endl << "@protected:" << endl;
-
-  const vector<t_field*>& members = tstruct->get_members();
-
-  // member varialbes
-  vector<t_field*>::const_iterator m_iter;
-  for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
-    out << indent() << declare_field(*m_iter) << endl;
-  }
-
-  if (members.size() > 0) {
-    out << endl;
-    // isset fields
-    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
-      indent(out) << "BOOL __" << (*m_iter)->get_name() << "_isset;" << endl;
-    }
-  }
-
-  scope_down(out);
+  out << "<TBase, NSCoding, NSCopying> " << endl;
+  
   out << endl;
 
   // properties
+  const vector<t_field*>& members = tstruct->get_members();
   if (members.size() > 0) {
-    out << "#if TARGET_OS_IPHONE || (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)"
-        << endl;
+    vector<t_field*>::const_iterator m_iter;
     for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
       out << indent() << declare_property(*m_iter) << endl;
+      out << indent() << declare_property_isset(*m_iter) << endl;
+      out << indent() << declare_property_unset(*m_iter) << endl;
+      out << endl;
     }
-    out << "#endif" << endl << endl;
   }
-
-  // default initializer
-  out << indent() << "- (id) init;" << endl;
+  
+  out << endl;
 
   // initializer for all fields
   if (!members.empty()) {
@@ -494,17 +597,6 @@ void t_cocoa_generator::generate_cocoa_struct_interface(ofstream& out,
   }
   out << endl;
 
-  // read and write
-  out << "- (void) read: (id <TProtocol>) inProtocol;" << endl;
-  out << "- (void) write: (id <TProtocol>) outProtocol;" << endl;
-  out << endl;
-
-  // validator
-  out << "- (void) validate;" << endl << endl;
-
-  // getters and setters
-  generate_cocoa_struct_field_accessor_declarations(out, tstruct, is_exception);
-
   out << "@end" << endl << endl;
 }
 
@@ -516,7 +608,7 @@ void t_cocoa_generator::generate_cocoa_struct_initializer_signature(ofstream& ou
                                                                     t_struct* tstruct) {
   const vector<t_field*>& members = tstruct->get_members();
   vector<t_field*>::const_iterator m_iter;
-  indent(out) << "- (id) initWith";
+  indent(out) << "- (instancetype) initWith";
   for (m_iter = members.begin(); m_iter != members.end();) {
     if (m_iter == members.begin()) {
       out << capitalize((*m_iter)->get_name());
@@ -532,41 +624,25 @@ void t_cocoa_generator::generate_cocoa_struct_initializer_signature(ofstream& ou
 }
 
 /**
- * Generate getter and setter declarations for all fields, plus an
- * IsSet getter.
- */
-void t_cocoa_generator::generate_cocoa_struct_field_accessor_declarations(ofstream& out,
-                                                                          t_struct* tstruct,
-                                                                          bool is_exception) {
-  (void)is_exception;
-  const vector<t_field*>& members = tstruct->get_members();
-  vector<t_field*>::const_iterator m_iter;
-  for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
-    out << indent() << "#if !__has_feature(objc_arc)" << endl;
-    out << indent() << "- (" << type_name((*m_iter)->get_type()) << ") "
-        << decapitalize((*m_iter)->get_name()) << ";" << endl;
-    out << indent() << "- (void) set" << capitalize((*m_iter)->get_name()) << ": ("
-        << type_name((*m_iter)->get_type()) << ") " << (*m_iter)->get_name() << ";" << endl;
-    out << indent() << "#endif" << endl;
-    out << indent() << "- (BOOL) " << (*m_iter)->get_name() << "IsSet;" << endl << endl;
-  }
-}
-
-/**
  * Generate the initWithCoder method for this struct so it's compatible with
  * the NSCoding protocol
  */
 void t_cocoa_generator::generate_cocoa_struct_init_with_coder_method(ofstream& out,
                                                                      t_struct* tstruct,
                                                                      bool is_exception) {
-  indent(out) << "- (id) initWithCoder: (NSCoder *) decoder" << endl;
+
+  indent(out) << "- (instancetype) initWithCoder: (NSCoder *) decoder" << endl;
   scope_up(out);
+  
   if (is_exception) {
     // NSExceptions conform to NSCoding, so we can call super
-    out << indent() << "self = [super initWithCoder: decoder];" << endl;
+    indent(out) << "self = [super initWithCoder: decoder];" << endl;
   } else {
-    out << indent() << "self = [super init];" << endl;
+    indent(out) << "self = [super init];" << endl;
   }
+  
+  indent(out) << "if (self) ";
+  scope_up(out);
 
   const vector<t_field*>& members = tstruct->get_members();
   vector<t_field*>::const_iterator m_iter;
@@ -576,9 +652,9 @@ void t_cocoa_generator::generate_cocoa_struct_init_with_coder_method(ofstream& o
     out << indent() << "if ([decoder containsValueForKey: @\"" << (*m_iter)->get_name() << "\"])"
         << endl;
     scope_up(out);
-    out << indent() << "__" << (*m_iter)->get_name() << " = ";
+    out << indent() << "_" << (*m_iter)->get_name() << " = ";
     if (type_can_be_null(t)) {
-      out << "[[decoder decodeObjectForKey: @\"" << (*m_iter)->get_name() << "\"] retain_stub];"
+      out << "[decoder decodeObjectForKey: @\"" << (*m_iter)->get_name() << "\"];"
           << endl;
     } else if (t->is_enum()) {
       out << "[decoder decodeIntForKey: @\"" << (*m_iter)->get_name() << "\"];" << endl;
@@ -608,9 +684,11 @@ void t_cocoa_generator::generate_cocoa_struct_init_with_coder_method(ofstream& o
             + t_base_type::t_base_name(tbase);
       }
     }
-    out << indent() << "__" << (*m_iter)->get_name() << "_isset = YES;" << endl;
+    out << indent() << "_" << (*m_iter)->get_name() << "IsSet = YES;" << endl;
     scope_down(out);
   }
+  
+  scope_down(out);
 
   out << indent() << "return self;" << endl;
   scope_down(out);
@@ -624,8 +702,10 @@ void t_cocoa_generator::generate_cocoa_struct_init_with_coder_method(ofstream& o
 void t_cocoa_generator::generate_cocoa_struct_encode_with_coder_method(ofstream& out,
                                                                        t_struct* tstruct,
                                                                        bool is_exception) {
+
   indent(out) << "- (void) encodeWithCoder: (NSCoder *) encoder" << endl;
   scope_up(out);
+  
   if (is_exception) {
     // NSExceptions conform to NSCoding, so we can call super
     out << indent() << "[super encodeWithCoder: encoder];" << endl;
@@ -636,40 +716,39 @@ void t_cocoa_generator::generate_cocoa_struct_encode_with_coder_method(ofstream&
 
   for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
     t_type* t = get_true_type((*m_iter)->get_type());
-    out << indent() << "if (__" << (*m_iter)->get_name() << "_isset)" << endl;
+    out << indent() << "if (_" << (*m_iter)->get_name() << "IsSet)" << endl;
     scope_up(out);
-    // out << indent() << "__" << (*m_iter)->get_name() << " = ";
     if (type_can_be_null(t)) {
-      out << indent() << "[encoder encodeObject: __" << (*m_iter)->get_name() << " forKey: @\""
+      out << indent() << "[encoder encodeObject: _" << (*m_iter)->get_name() << " forKey: @\""
           << (*m_iter)->get_name() << "\"];" << endl;
     } else if (t->is_enum()) {
-      out << indent() << "[encoder encodeInt: __" << (*m_iter)->get_name() << " forKey: @\""
+      out << indent() << "[encoder encodeInt: _" << (*m_iter)->get_name() << " forKey: @\""
           << (*m_iter)->get_name() << "\"];" << endl;
     } else {
       t_base_type::t_base tbase = ((t_base_type*)t)->get_base();
       switch (tbase) {
       case t_base_type::TYPE_BOOL:
-        out << indent() << "[encoder encodeBool: __" << (*m_iter)->get_name() << " forKey: @\""
+        out << indent() << "[encoder encodeBool: _" << (*m_iter)->get_name() << " forKey: @\""
             << (*m_iter)->get_name() << "\"];" << endl;
         break;
       case t_base_type::TYPE_BYTE:
-        out << indent() << "[encoder encodeInt: __" << (*m_iter)->get_name() << " forKey: @\""
+        out << indent() << "[encoder encodeInt: _" << (*m_iter)->get_name() << " forKey: @\""
             << (*m_iter)->get_name() << "\"];" << endl;
         break;
       case t_base_type::TYPE_I16:
-        out << indent() << "[encoder encodeInt: __" << (*m_iter)->get_name() << " forKey: @\""
+        out << indent() << "[encoder encodeInt: _" << (*m_iter)->get_name() << " forKey: @\""
             << (*m_iter)->get_name() << "\"];" << endl;
         break;
       case t_base_type::TYPE_I32:
-        out << indent() << "[encoder encodeInt32: __" << (*m_iter)->get_name() << " forKey: @\""
+        out << indent() << "[encoder encodeInt32: _" << (*m_iter)->get_name() << " forKey: @\""
             << (*m_iter)->get_name() << "\"];" << endl;
         break;
       case t_base_type::TYPE_I64:
-        out << indent() << "[encoder encodeInt64: __" << (*m_iter)->get_name() << " forKey: @\""
+        out << indent() << "[encoder encodeInt64: _" << (*m_iter)->get_name() << " forKey: @\""
             << (*m_iter)->get_name() << "\"];" << endl;
         break;
       case t_base_type::TYPE_DOUBLE:
-        out << indent() << "[encoder encodeDouble: __" << (*m_iter)->get_name() << " forKey: @\""
+        out << indent() << "[encoder encodeDouble: _" << (*m_iter)->get_name() << " forKey: @\""
             << (*m_iter)->get_name() << "\"];" << endl;
         break;
       default:
@@ -685,6 +764,38 @@ void t_cocoa_generator::generate_cocoa_struct_encode_with_coder_method(ofstream&
 }
 
 /**
+ * Generate the copy method for this struct
+ */
+void t_cocoa_generator::generate_cocoa_struct_copy_method(ofstream& out, t_struct* tstruct, bool is_exception) {
+  out << indent() << "- (instancetype) copyWithZone:(NSZone *)zone" << endl;
+  scope_up(out);
+  
+  if (is_exception) {
+    out << indent() << type_name(tstruct) << " val = [" << cocoa_prefix_ << tstruct->get_name() << " errorWithDomain: self.domain code: self.code userInfo: self.userInfo];" << endl;
+  } else {
+    out << indent() << type_name(tstruct) << " val = [" << cocoa_prefix_ << tstruct->get_name() << " new];" << endl;
+  }
+  
+  const vector<t_field*>& members = tstruct->get_members();
+  vector<t_field*>::const_iterator m_iter;
+  
+  for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+    t_type* t = get_true_type((*m_iter)->get_type());
+    if (type_can_be_null(t)) {
+      out << indent() << "val." << (*m_iter)->get_name() << " = [self." << (*m_iter)->get_name() << " copy];";
+    } else {
+      out << indent() << "val." << (*m_iter)->get_name() << " = self." << (*m_iter)->get_name() << ";";
+    }
+    out << endl;
+  }
+  
+  out << indent() << "return val;" << endl;
+  
+  scope_down(out);
+  out << endl;
+}
+
+/**
  * Generate the hash method for this struct
  */
 void t_cocoa_generator::generate_cocoa_struct_hash_method(ofstream& out, t_struct* tstruct) {
@@ -697,14 +808,14 @@ void t_cocoa_generator::generate_cocoa_struct_hash_method(ofstream& out, t_struc
 
   for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
     t_type* t = get_true_type((*m_iter)->get_type());
-    out << indent() << "hash = (hash * 31) ^ __" << (*m_iter)->get_name()
-        << "_isset ? 2654435761 : 0;" << endl;
-    out << indent() << "if (__" << (*m_iter)->get_name() << "_isset)" << endl;
+    out << indent() << "hash = (hash * 31) ^ _" << (*m_iter)->get_name()
+        << "IsSet ? 2654435761 : 0;" << endl;
+    out << indent() << "if (_" << (*m_iter)->get_name() << "IsSet)" << endl;
     scope_up(out);
     if (type_can_be_null(t)) {
-      out << indent() << "hash = (hash * 31) ^ [__" << (*m_iter)->get_name() << " hash];" << endl;
+      out << indent() << "hash = (hash * 31) ^ [_" << (*m_iter)->get_name() << " hash];" << endl;
     } else {
-      out << indent() << "hash = (hash * 31) ^ [@(__" << (*m_iter)->get_name() << ") hash];"
+      out << indent() << "hash = (hash * 31) ^ [@(_" << (*m_iter)->get_name() << ") hash];"
           << endl;
     }
     scope_down(out);
@@ -718,7 +829,7 @@ void t_cocoa_generator::generate_cocoa_struct_hash_method(ofstream& out, t_struc
 /**
  * Generate the isEqual method for this struct
  */
-void t_cocoa_generator::generate_cocoa_struct_is_equal_method(ofstream& out, t_struct* tstruct) {
+void t_cocoa_generator::generate_cocoa_struct_is_equal_method(ofstream& out, t_struct* tstruct, bool is_exception) {
   indent(out) << "- (BOOL) isEqual: (id) anObject" << endl;
   scope_up(out);
 
@@ -730,36 +841,47 @@ void t_cocoa_generator::generate_cocoa_struct_is_equal_method(ofstream& out, t_s
 
   string class_name = cocoa_prefix_ + tstruct->get_name();
 
-  indent(out) << "if (![anObject isKindOfClass:[" << class_name << " class]]) {" << endl;
-  indent_up();
-  indent(out) << "return NO;" << endl;
-  indent_down();
-  indent(out) << "}" << endl;
-
-  indent(out) << class_name << " *other = (" << class_name << " *)anObject;" << endl;
+  if (is_exception) {
+    indent(out) << "if (![super isEqual:anObject]) {" << endl;
+    indent_up();
+    indent(out) << "return NO;" << endl;
+    indent_down();
+    indent(out) << "}" << endl << endl;
+  }
+  else {
+    indent(out) << "if (![anObject isKindOfClass:[" << class_name << " class]]) {" << endl;
+    indent_up();
+    indent(out) << "return NO;" << endl;
+    indent_down();
+    indent(out) << "}" << endl;
+  }
 
   const vector<t_field*>& members = tstruct->get_members();
   vector<t_field*>::const_iterator m_iter;
 
-  for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
-    t_type* t = get_true_type((*m_iter)->get_type());
-    string name = (*m_iter)->get_name();
-    if (type_can_be_null(t)) {
-      out << indent() << "if ((__" << name << "_isset != other->__" << name << "_isset) ||" << endl
-          << indent() << "    "
-          << "(__" << name << "_isset && "
-          << "((__" << name << " || other->__" << name << ") && "
-          << "![__" << name << " isEqual:other->__" << name << "]))) {" << endl;
-    } else {
-      out << indent() << "if ((__" << name << "_isset != other->__" << name << "_isset) ||" << endl
-          << indent() << "    "
-          << "(__" << name << "_isset && "
-          << "(__" << name << " != other->__" << name << "))) {" << endl;
+  if (!members.empty()) {
+    indent(out) << class_name << " *other = (" << class_name << " *)anObject;" << endl;
+    
+    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+      t_type* t = get_true_type((*m_iter)->get_type());
+      string name = (*m_iter)->get_name();
+      if (type_can_be_null(t)) {
+        out << indent() << "if ((_" << name << "IsSet != other->_" << name << "IsSet) ||" << endl
+            << indent() << "    "
+            << "(_" << name << "IsSet && "
+            << "((_" << name << " || other->_" << name << ") && "
+            << "![_" << name << " isEqual:other->_" << name << "]))) {" << endl;
+      } else {
+        out << indent() << "if ((_" << name << "IsSet != other->_" << name << "IsSet) ||" << endl
+            << indent() << "    "
+            << "(_" << name << "IsSet && "
+            << "(_" << name << " != other->_" << name << "))) {" << endl;
+      }
+      indent_up();
+      indent(out) << "return NO;" << endl;
+      indent_down();
+      indent(out) << "}" << endl;
     }
-    indent_up();
-    indent(out) << "return NO;" << endl;
-    indent_down();
-    indent(out) << "}" << endl;
   }
 
   out << indent() << "return YES;" << endl;
@@ -785,10 +907,11 @@ void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream& out,
 
   // exceptions need to call the designated initializer on NSException
   if (is_exception) {
-    out << indent() << "- (id) init" << endl;
+    out << indent() << "- (instancetype) init" << endl;
     scope_up(out);
-    out << indent() << "return [super initWithName: @\"" << cocoa_prefix_ << tstruct->get_name()
-        << "\" reason: @\"unknown\" userInfo: nil];" << endl;
+    out << indent() << "return [super initWithDomain: " << cocoa_prefix_ << capitalize(program_name_) << "ErrorDomain" << endl
+        << indent() << "                        code: " << cocoa_prefix_ << capitalize(program_name_) << "Error" << tstruct->get_name() << endl
+        << indent() << "                    userInfo: nil];" << endl;
     scope_down(out);
     out << endl;
   } else {
@@ -796,12 +919,12 @@ void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream& out,
 
     // default initializer
     // setup instance variables with default values
-    indent(out) << "- (id) init" << endl;
+    indent(out) << "- (instancetype) init" << endl;
     scope_up(out);
     indent(out) << "self = [super init];" << endl;
+    indent(out) << "if (self)";
+    scope_up(out);
     if (members.size() > 0) {
-      out << "#if TARGET_OS_IPHONE || (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)"
-          << endl;
       for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
         t_type* t = get_true_type((*m_iter)->get_type());
         if ((*m_iter)->get_value() != NULL) {
@@ -813,8 +936,8 @@ void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream& out,
                             true);
         }
       }
-      out << "#endif" << endl;
     }
+    scope_down(out);
     indent(out) << "return self;" << endl;
     scope_down(out);
     out << endl;
@@ -830,17 +953,19 @@ void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream& out,
     } else {
       out << indent() << "self = [super init];" << endl;
     }
-
+    
+    indent(out) << "if (self)";
+    scope_up(out);
     for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
-      t_type* t = get_true_type((*m_iter)->get_type());
-      out << indent() << "__" << (*m_iter)->get_name() << " = ";
-      if (type_can_be_null(t)) {
-        out << "[" << (*m_iter)->get_name() << " retain_stub];" << endl;
+      out << indent() << "_" << (*m_iter)->get_name() << " = ";
+      if (get_true_type((*m_iter)->get_type())->is_container()) {
+        out << "[" << (*m_iter)->get_name() << " mutableCopy];" << endl;
       } else {
         out << (*m_iter)->get_name() << ";" << endl;
       }
-      out << indent() << "__" << (*m_iter)->get_name() << "_isset = YES;" << endl;
+      out << indent() << "_" << (*m_iter)->get_name() << "IsSet = YES;" << endl;
     }
+    scope_down(out);
 
     out << indent() << "return self;" << endl;
     scope_down(out);
@@ -853,24 +978,9 @@ void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream& out,
   generate_cocoa_struct_encode_with_coder_method(out, tstruct, is_exception);
   // hash and isEqual for NSObject
   generate_cocoa_struct_hash_method(out, tstruct);
-  generate_cocoa_struct_is_equal_method(out, tstruct);
-
-  // dealloc
-  if (!members.empty()) {
-    out << "- (void) dealloc" << endl;
-    scope_up(out);
-
-    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
-      t_type* t = get_true_type((*m_iter)->get_type());
-      if (type_can_be_null(t)) {
-        indent(out) << "[__" << (*m_iter)->get_name() << " release_stub];" << endl;
-      }
-    }
-
-    out << indent() << "[super dealloc_stub];" << endl;
-    scope_down(out);
-    out << endl;
-  }
+  generate_cocoa_struct_is_equal_method(out, tstruct, is_exception);
+  // copy for NSObject
+  generate_cocoa_struct_copy_method(out, tstruct, is_exception);
 
   // the rest of the methods
   generate_cocoa_struct_field_accessor_implementations(out, tstruct, is_exception);
@@ -892,7 +1002,7 @@ void t_cocoa_generator::generate_cocoa_struct_implementation(ofstream& out,
  * @param tstruct The struct definition
  */
 void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out, t_struct* tstruct) {
-  out << "- (void) read: (id <TProtocol>) inProtocol" << endl;
+  out << "- (BOOL) read: (id <TProtocol>) inProtocol error: (NSError *__autoreleasing *)__thriftError" << endl;
   scope_up(out);
 
   const vector<t_field*>& fields = tstruct->get_members();
@@ -900,11 +1010,11 @@ void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out, t_struct* ts
 
   // Declare stack tmp variables
   indent(out) << "NSString * fieldName;" << endl;
-  indent(out) << "int fieldType;" << endl;
-  indent(out) << "int fieldID;" << endl;
+  indent(out) << "SInt32 fieldType;" << endl;
+  indent(out) << "SInt32 fieldID;" << endl;
   out << endl;
 
-  indent(out) << "[inProtocol readStructBeginReturningName: NULL];" << endl;
+  indent(out) << "if (![inProtocol readStructBeginReturningName: NULL error: __thriftError]) return NO;" << endl;
 
   // Loop over reading in fields
   indent(out) << "while (true)" << endl;
@@ -912,11 +1022,11 @@ void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out, t_struct* ts
 
   // Read beginning field marker
   indent(out)
-      << "[inProtocol readFieldBeginReturningName: &fieldName type: &fieldType fieldID: &fieldID];"
+      << "if (![inProtocol readFieldBeginReturningName: &fieldName type: &fieldType fieldID: &fieldID error: __thriftError]) return NO;"
       << endl;
 
   // Check for field STOP marker and break
-  indent(out) << "if (fieldType == TType_STOP) { " << endl;
+  indent(out) << "if (fieldType == TTypeSTOP) { " << endl;
   indent_up();
   indent(out) << "break;" << endl;
   indent_down();
@@ -936,23 +1046,16 @@ void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out, t_struct* ts
 
     generate_deserialize_field(out, *f_iter, "fieldValue");
     indent(out) << call_field_setter(*f_iter, "fieldValue") << endl;
-    // if this is an allocated field, release it since the struct
-    // is now retaining it
-    if (type_can_be_null((*f_iter)->get_type())) {
-      // deserialized strings are autorelease, so don't release them
-      if (!(get_true_type((*f_iter)->get_type())->is_string())) {
-        indent(out) << "[fieldValue release_stub];" << endl;
-      }
-    }
 
     indent_down();
     out << indent() << "} else { " << endl;
     if (log_unexpected_) {
       out << indent() << "  NSLog(@\"%s: field ID %i has unexpected type %i.  Skipping.\", "
-                         "__PRETTY_FUNCTION__, fieldID, fieldType);" << endl;
+                         "__PRETTY_FUNCTION__, (int)fieldID, (int)fieldType);" << endl;
     }
-    out << indent() << "  [TProtocolUtil skipType: fieldType onProtocol: inProtocol];" << endl
-        << indent() << "}" << endl << indent() << "break;" << endl;
+    
+    out << indent() << "  if (![TProtocolUtil skipType: fieldType onProtocol: inProtocol error: __thriftError]) return NO;" << endl;
+    out << indent() << "}" << endl << indent() << "break;" << endl;
     indent_down();
   }
 
@@ -960,25 +1063,29 @@ void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out, t_struct* ts
   out << indent() << "default:" << endl;
   if (log_unexpected_) {
     out << indent() << "  NSLog(@\"%s: unexpected field ID %i with type %i.  Skipping.\", "
-                       "__PRETTY_FUNCTION__, fieldID, fieldType);" << endl;
+                       "__PRETTY_FUNCTION__, (int)fieldID, (int)fieldType);" << endl;
   }
-  out << indent() << "  [TProtocolUtil skipType: fieldType onProtocol: inProtocol];" << endl
-      << indent() << "  break;" << endl;
+
+  out << indent() << "  if (![TProtocolUtil skipType: fieldType onProtocol: inProtocol error: __thriftError]) return NO;" << endl;
+  
+  out << indent() << "  break;" << endl;
 
   scope_down(out);
 
   // Read field end marker
-  indent(out) << "[inProtocol readFieldEnd];" << endl;
+  indent(out) << "if (![inProtocol readFieldEnd: __thriftError]) return NO;" << endl;
 
   scope_down(out);
 
-  out << indent() << "[inProtocol readStructEnd];" << endl;
+  out << indent() << "if (![inProtocol readStructEnd: __thriftError]) return NO;" << endl;
 
   // performs various checks (e.g. check that all required fields are set)
   if (validate_required_) {
-    out << indent() << "[self validate];" << endl;
+    out << indent() << "if (![self validate: __thriftError]) return NO;" << endl;
   }
 
+  indent(out) << "return YES;" << endl;
+  
   indent_down();
   out << indent() << "}" << endl << endl;
 }
@@ -989,33 +1096,33 @@ void t_cocoa_generator::generate_cocoa_struct_reader(ofstream& out, t_struct* ts
  * @param tstruct The struct definition
  */
 void t_cocoa_generator::generate_cocoa_struct_writer(ofstream& out, t_struct* tstruct) {
-  out << indent() << "- (void) write: (id <TProtocol>) outProtocol {" << endl;
+  out << indent() << "- (BOOL) write: (id <TProtocol>) outProtocol error: (NSError *__autoreleasing *)__thriftError {" << endl;
   indent_up();
 
   string name = tstruct->get_name();
   const vector<t_field*>& fields = tstruct->get_members();
   vector<t_field*>::const_iterator f_iter;
 
-  out << indent() << "[outProtocol writeStructBeginWithName: @\"" << name << "\"];" << endl;
+  out << indent() << "if (![outProtocol writeStructBeginWithName: @\"" << name << "\" error: __thriftError]) return NO;" << endl;
 
   for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
-    out << indent() << "if (__" << (*f_iter)->get_name() << "_isset) {" << endl;
+    out << indent() << "if (_" << (*f_iter)->get_name() << "IsSet) {" << endl;
     indent_up();
     bool null_allowed = type_can_be_null((*f_iter)->get_type());
     if (null_allowed) {
-      out << indent() << "if (__" << (*f_iter)->get_name() << " != nil) {" << endl;
+      out << indent() << "if (_" << (*f_iter)->get_name() << " != nil) {" << endl;
       indent_up();
     }
 
-    indent(out) << "[outProtocol writeFieldBeginWithName: @\"" << (*f_iter)->get_name()
+    indent(out) << "if (![outProtocol writeFieldBeginWithName: @\"" << (*f_iter)->get_name()
                 << "\" type: " << type_to_enum((*f_iter)->get_type())
-                << " fieldID: " << (*f_iter)->get_key() << "];" << endl;
+                << " fieldID: " << (*f_iter)->get_key() << " error: __thriftError]) return NO;" << endl;
 
     // Write field contents
-    generate_serialize_field(out, *f_iter, "__" + (*f_iter)->get_name());
+    generate_serialize_field(out, *f_iter, "_" + (*f_iter)->get_name());
 
     // Write field closer
-    indent(out) << "[outProtocol writeFieldEnd];" << endl;
+    indent(out) << "if (![outProtocol writeFieldEnd: __thriftError]) return NO;" << endl;
 
     if (null_allowed) {
       scope_down(out);
@@ -1023,9 +1130,11 @@ void t_cocoa_generator::generate_cocoa_struct_writer(ofstream& out, t_struct* ts
     scope_down(out);
   }
   // Write the struct map
-  out << indent() << "[outProtocol writeFieldStop];" << endl << indent()
-      << "[outProtocol writeStructEnd];" << endl;
+  out << indent() << "if (![outProtocol writeFieldStop: __thriftError]) return NO;" << endl
+      << indent() << "if (![outProtocol writeStructEnd: __thriftError]) return NO;" << endl;
 
+  indent(out) << "return YES;" << endl;
+  
   indent_down();
   out << indent() << "}" << endl << endl;
 }
@@ -1038,14 +1147,14 @@ void t_cocoa_generator::generate_cocoa_struct_writer(ofstream& out, t_struct* ts
  * @param tstruct The struct definition
  */
 void t_cocoa_generator::generate_cocoa_struct_result_writer(ofstream& out, t_struct* tstruct) {
-  out << indent() << "- (void) write: (id <TProtocol>) outProtocol {" << endl;
+  out << indent() << "- (BOOL) write: (id <TProtocol>) outProtocol error: (NSError *__autoreleasing *)__thriftError {" << endl;
   indent_up();
 
   string name = tstruct->get_name();
   const vector<t_field*>& fields = tstruct->get_members();
   vector<t_field*>::const_iterator f_iter;
 
-  out << indent() << "[outProtocol writeStructBeginWithName: @\"" << name << "\"];" << endl;
+  out << indent() << "if (![outProtocol writeStructBeginWithName: @\"" << name << "\" error: __thriftError]) return NO;" << endl;
 
   bool first = true;
   for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
@@ -1056,24 +1165,24 @@ void t_cocoa_generator::generate_cocoa_struct_result_writer(ofstream& out, t_str
       out << " else if ";
     }
 
-    out << "(__" << (*f_iter)->get_name() << "_isset) {" << endl;
+    out << "(_" << (*f_iter)->get_name() << "IsSet) {" << endl;
     indent_up();
 
     bool null_allowed = type_can_be_null((*f_iter)->get_type());
     if (null_allowed) {
-      out << indent() << "if (__" << (*f_iter)->get_name() << " != nil) {" << endl;
+      out << indent() << "if (_" << (*f_iter)->get_name() << " != nil) {" << endl;
       indent_up();
     }
 
-    indent(out) << "[outProtocol writeFieldBeginWithName: @\"" << (*f_iter)->get_name()
+    indent(out) << "if (![outProtocol writeFieldBeginWithName: @\"" << (*f_iter)->get_name()
                 << "\" type: " << type_to_enum((*f_iter)->get_type())
-                << " fieldID: " << (*f_iter)->get_key() << "];" << endl;
+                << " fieldID: " << (*f_iter)->get_key() << " error: __thriftError]) return NO;" << endl;
 
     // Write field contents
-    generate_serialize_field(out, *f_iter, "__" + (*f_iter)->get_name());
+    generate_serialize_field(out, *f_iter, "_" + (*f_iter)->get_name());
 
     // Write field closer
-    indent(out) << "[outProtocol writeFieldEnd];" << endl;
+    indent(out) << "if (![outProtocol writeFieldEnd: __thriftError]) return NO;" << endl;
 
     if (null_allowed) {
       indent_down();
@@ -1084,9 +1193,12 @@ void t_cocoa_generator::generate_cocoa_struct_result_writer(ofstream& out, t_str
     indent(out) << "}";
   }
   // Write the struct map
-  out << endl << indent() << "[outProtocol writeFieldStop];" << endl << indent()
-      << "[outProtocol writeStructEnd];" << endl;
+  out << endl << indent() << "if (![outProtocol writeFieldStop: __thriftError]) return NO;"
+      << endl << indent() << "if (![outProtocol writeStructEnd: __thriftError]) return NO;"
+      << endl;
 
+  indent(out) << "return YES;" << endl;
+  
   indent_down();
   out << indent() << "}" << endl << endl;
 }
@@ -1098,7 +1210,7 @@ void t_cocoa_generator::generate_cocoa_struct_result_writer(ofstream& out, t_str
  * @param tstruct The struct definition
  */
 void t_cocoa_generator::generate_cocoa_struct_validator(ofstream& out, t_struct* tstruct) {
-  out << indent() << "- (void) validate {" << endl;
+  out << indent() << "- (BOOL) validate: (NSError *__autoreleasing *)__thriftError {" << endl;
   indent_up();
 
   const vector<t_field*>& fields = tstruct->get_members();
@@ -1108,13 +1220,19 @@ void t_cocoa_generator::generate_cocoa_struct_validator(ofstream& out, t_struct*
   for (f_iter = fields.begin(); f_iter != fields.end(); ++f_iter) {
     t_field* field = (*f_iter);
     if ((*f_iter)->get_req() == t_field::T_REQUIRED) {
-      out << indent() << "if (!__" << field->get_name() << "_isset) {" << endl << indent()
-          << "  @throw [TProtocolException exceptionWithName: @\"TProtocolException\"" << endl
-          << indent() << "                             reason: @\"Required field '"
-          << (*f_iter)->get_name() << "' is not set.\"];" << endl << indent() << "}" << endl;
+      out << indent() << "if (!_" << field->get_name() << "IsSet) ";
+      scope_up(out);
+      indent(out) << "if (__thriftError) ";
+      scope_up(out);
+      out << indent() << "*__thriftError = [NSError errorWithDomain: TProtocolErrorDomain" << endl
+          << indent() << "                                     code: TProtocolErrorUnknown" << endl
+          << indent() << "                                 userInfo: @{TProtocolErrorExtendedErrorKey: @(TProtocolExtendedErrorMissingRequiredField)," << endl
+          << indent() << "                                             TProtocolErrorFieldNameKey: @\"" << (*f_iter)->get_name() << "\"}];" << endl;
+      scope_down(out);
+      scope_down(out);
     }
   }
-
+  indent(out) << "return YES;" << endl;
   indent_down();
   out << indent() << "}" << endl << endl;
 }
@@ -1138,37 +1256,12 @@ void t_cocoa_generator::generate_cocoa_struct_field_accessor_implementations(ofs
     std::string cap_name = field_name;
     cap_name[0] = toupper(cap_name[0]);
 
-    // Simple getter
-    indent(out) << "- (" << type_name(type) << ") ";
-    out << field_name << " {" << endl;
-    indent_up();
-    if (!type_can_be_null(type)) {
-      indent(out) << "return __" << field_name << ";" << endl;
-    } else {
-      indent(out) << "return [[__" << field_name << " retain_stub] autorelease_stub];" << endl;
-    }
-    indent_down();
-    indent(out) << "}" << endl << endl;
-
     // Simple setter
-    indent(out) << "- (void) set" << cap_name << ": (" << type_name(type) << ") " << field_name
+    indent(out) << "- (void) set" << cap_name << ": (" << type_name(type, false, true) << ") " << field_name
                 << " {" << endl;
     indent_up();
-    if (!type_can_be_null(type)) {
-      indent(out) << "__" << field_name << " = " << field_name << ";" << endl;
-    } else {
-      indent(out) << "[" << field_name << " retain_stub];" << endl;
-      indent(out) << "[__" << field_name << " release_stub];" << endl;
-      indent(out) << "__" << field_name << " = " << field_name << ";" << endl;
-    }
-    indent(out) << "__" << field_name << "_isset = YES;" << endl;
-    indent_down();
-    indent(out) << "}" << endl << endl;
-
-    // IsSet
-    indent(out) << "- (BOOL) " << field_name << "IsSet {" << endl;
-    indent_up();
-    indent(out) << "return __" << field_name << "_isset;" << endl;
+    indent(out) << "_" << field_name << " = " << field_name << ";" << endl;
+    indent(out) << "_" << field_name << "IsSet = YES;" << endl;
     indent_down();
     indent(out) << "}" << endl << endl;
 
@@ -1176,10 +1269,9 @@ void t_cocoa_generator::generate_cocoa_struct_field_accessor_implementations(ofs
     indent(out) << "- (void) unset" << cap_name << " {" << endl;
     indent_up();
     if (type_can_be_null(type)) {
-      indent(out) << "[__" << field_name << " release_stub];" << endl;
-      indent(out) << "__" << field_name << " = nil;" << endl;
+      indent(out) << "_" << field_name << " = nil;" << endl;
     }
-    indent(out) << "__" << field_name << "_isset = NO;" << endl;
+    indent(out) << "_" << field_name << "IsSet = NO;" << endl;
     indent_down();
     indent(out) << "}" << endl << endl;
   }
@@ -1191,7 +1283,14 @@ void t_cocoa_generator::generate_cocoa_struct_field_accessor_implementations(ofs
  * @param tstruct The struct definition
  */
 void t_cocoa_generator::generate_cocoa_struct_description(ofstream& out, t_struct* tstruct) {
-  out << indent() << "- (NSString *) description {" << endl;
+  
+  // Allow use of debugDescription so the app can add description via a cateogory/extension
+  if (debug_descriptions_) {
+    out << indent() << "- (NSString *) debugDescription {" << endl;
+  }
+  else {
+    out << indent() << "- (NSString *) description {" << endl;
+  }
   indent_up();
 
   out << indent() << "NSMutableString * ms = [NSMutableString stringWithString: @\""
@@ -1208,8 +1307,8 @@ void t_cocoa_generator::generate_cocoa_struct_description(ofstream& out, t_struc
       indent(out) << "[ms appendString: @\"," << (*f_iter)->get_name() << ":\"];" << endl;
     }
     t_type* ttype = (*f_iter)->get_type();
-    indent(out) << "[ms appendFormat: @\"" << format_string_for_type(ttype) << "\", __"
-                << (*f_iter)->get_name() << "];" << endl;
+    indent(out) << "[ms appendFormat: @\"" << format_string_for_type(ttype) << "\", "
+                << format_cast_for_type(ttype) << "_" << (*f_iter)->get_name() << "];" << endl;
   }
   out << indent() << "[ms appendString: @\")\"];" << endl << indent()
       << "return [NSString stringWithString: ms];" << endl;
@@ -1247,23 +1346,35 @@ void t_cocoa_generator::generate_cocoa_service_helpers(t_service* tservice) {
   vector<t_function*> functions = tservice->get_functions();
   vector<t_function*>::iterator f_iter;
   for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
+    
     t_struct* ts = (*f_iter)->get_arglist();
-    generate_cocoa_struct_interface(f_impl_, ts, false);
-    generate_cocoa_struct_implementation(f_impl_, ts, false, false);
-    generate_function_helpers(*f_iter);
+    
+    string qname = function_args_helper_struct_type(tservice, *f_iter);
+    
+    t_struct qname_ts = t_struct(ts->get_program(), qname);
+
+    const vector<t_field*>& members = ts->get_members();
+    vector<t_field*>::const_iterator m_iter;
+    for (m_iter = members.begin(); m_iter != members.end(); ++m_iter) {
+      qname_ts.append(*m_iter);
+    }
+    
+    generate_cocoa_struct_interface(f_impl_, &qname_ts, false);
+    generate_cocoa_struct_implementation(f_impl_, &qname_ts, false, false);
+    generate_function_helpers(tservice, *f_iter);
   }
 }
 
-string t_cocoa_generator::function_result_helper_struct_type(t_function* tfunction) {
+string t_cocoa_generator::function_result_helper_struct_type(t_service *tservice, t_function* tfunction) {
   if (tfunction->is_oneway()) {
-    return capitalize(tfunction->get_name());
+    return tservice->get_name() + "_" + tfunction->get_name();
   } else {
-    return capitalize(tfunction->get_name()) + "_result";
+    return tservice->get_name() + "_" + tfunction->get_name() + "_result";
   }
 }
 
-string t_cocoa_generator::function_args_helper_struct_type(t_function* tfunction) {
-  return tfunction->get_name() + "_args";
+string t_cocoa_generator::function_args_helper_struct_type(t_service *tservice, t_function* tfunction) {
+  return tservice->get_name() + "_" + tfunction->get_name() + "_args";
 }
 
 /**
@@ -1271,14 +1382,14 @@ string t_cocoa_generator::function_args_helper_struct_type(t_function* tfunction
  *
  * @param tfunction The function
  */
-void t_cocoa_generator::generate_function_helpers(t_function* tfunction) {
+void t_cocoa_generator::generate_function_helpers(t_service *tservice, t_function* tfunction) {
   if (tfunction->is_oneway()) {
     return;
   }
 
   // create a result struct with a success field of the return type,
   // and a field for each type of exception thrown
-  t_struct result(program_, function_result_helper_struct_type(tfunction));
+  t_struct result(program_, function_result_helper_struct_type(tservice, tfunction));
   t_field success(tfunction->get_returntype(), "success", 0);
   if (!tfunction->get_returntype()->is_void()) {
     result.append(&success);
@@ -1307,7 +1418,7 @@ void t_cocoa_generator::generate_cocoa_service_protocol(ofstream& out, t_service
   vector<t_function*> functions = tservice->get_functions();
   vector<t_function*>::iterator f_iter;
   for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
-    out << "- " << function_signature(*f_iter) << ";"
+    out << "- " << function_signature(*f_iter, true) << ";"
         << "  // throws ";
     t_struct* xs = (*f_iter)->get_xceptions();
     const std::vector<t_field*>& xceptions = xs->get_members();
@@ -1332,7 +1443,10 @@ void t_cocoa_generator::generate_cocoa_service_async_protocol(ofstream& out, t_s
   vector<t_function*> functions = tservice->get_functions();
   vector<t_function*>::iterator f_iter;
   for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
-    out << "- " << async_function_signature(*f_iter) << ";" << endl;
+    out << "- " << async_function_signature(*f_iter, false) << ";" << endl;
+    if (promise_kit_) {
+      out << "- " << promise_function_signature(*f_iter) << ";" << endl;
+    }
   }
   out << "@end" << endl << endl;
 }
@@ -1345,7 +1459,7 @@ void t_cocoa_generator::generate_cocoa_service_async_protocol(ofstream& out, t_s
 void t_cocoa_generator::generate_cocoa_service_client_interface(ofstream& out,
                                                                 t_service* tservice) {
   out << "@interface " << cocoa_prefix_ << tservice->get_name() << "Client : TBaseClient <"
-      << cocoa_prefix_ << tservice->get_name() << "> ";
+      << cocoa_prefix_ << tservice->get_name() << "> " << endl;
 
   out << "- (id) initWithProtocol: (id <TProtocol>) protocol;" << endl;
   out << "- (id) initWithInProtocol: (id <TProtocol>) inProtocol outProtocol: (id <TProtocol>) "
@@ -1361,14 +1475,11 @@ void t_cocoa_generator::generate_cocoa_service_client_interface(ofstream& out,
 void t_cocoa_generator::generate_cocoa_service_client_async_interface(ofstream& out,
                                                                       t_service* tservice) {
   out << "@interface " << cocoa_prefix_ << tservice->get_name() << "ClientAsync : TBaseClient <"
-      << cocoa_prefix_ << tservice->get_name() << "Async> ";
-
-  scope_up(out);
-  out << indent() << "id <TAsyncTransport> asyncTransport;" << endl;
-  scope_down(out);
+      << cocoa_prefix_ << tservice->get_name() << "Async> " << endl
+      << endl;
 
-  out << "- (id) initWithProtocolFactory: (id <TProtocolFactory>) factory "
-         "transport: (id <TAsyncTransport>) transport;" << endl;
+  out << "- (id) initWithProtocolFactory: (id <TProtocolFactory>) protocolFactory "
+      << "transportFactory: (id <TAsyncTransportFactory>) transportFactory;" << endl;
   out << "@end" << endl << endl;
 }
 
@@ -1382,12 +1493,7 @@ void t_cocoa_generator::generate_cocoa_service_client_async_interface(ofstream&
 void t_cocoa_generator::generate_cocoa_service_server_interface(ofstream& out,
                                                                 t_service* tservice) {
   out << "@interface " << cocoa_prefix_ << tservice->get_name()
-      << "Processor : NSObject <TProcessor> ";
-
-  scope_up(out);
-  out << indent() << "id <" << cocoa_prefix_ << tservice->get_name() << "> mService;" << endl;
-  out << indent() << "NSDictionary * mMethodMap;" << endl;
-  scope_down(out);
+      << "Processor : NSObject <TProcessor> " << endl;
 
   out << "- (id) initWith" << tservice->get_name() << ": (id <" << cocoa_prefix_
       << tservice->get_name() << ">) service;" << endl;
@@ -1398,25 +1504,28 @@ void t_cocoa_generator::generate_cocoa_service_server_interface(ofstream& out,
 
 void t_cocoa_generator::generate_cocoa_service_client_send_function_implementation(
     ofstream& out,
-    t_function* tfunction) {
+    t_service *tservice,
+    t_function* tfunction,
+    bool needs_protocol) {
   string funname = tfunction->get_name();
 
-  t_function send_function(g_type_void,
+  t_function send_function(g_type_bool,
                            string("send_") + tfunction->get_name(),
                            tfunction->get_arglist());
 
-  string argsname = tfunction->get_name() + "_args";
+  string argsname = function_args_helper_struct_type(tservice, tfunction);
 
   // Open function
-  indent(out) << "- " << function_signature(&send_function) << endl;
+  indent(out) << "- (BOOL) send_" << tfunction->get_name() << argument_list(tfunction->get_arglist(), needs_protocol ? "outProtocol" : "", true) << endl;
   scope_up(out);
-
+  
   // Serialize the request
-  out << indent() << "[outProtocol writeMessageBeginWithName: @\"" << funname << "\""
-      << (tfunction->is_oneway() ? " type: TMessageType_ONEWAY" : " type: TMessageType_CALL")
-      << " sequenceID: 0];" << endl;
+  out << indent() << "if (![outProtocol writeMessageBeginWithName: @\"" << funname << "\""
+      << (tfunction->is_oneway() ? " type: TMessageTypeONEWAY" : " type: TMessageTypeCALL")
+      << " sequenceID: 0 error: __thriftError]) return NO;" << endl;
 
-  out << indent() << "[outProtocol writeStructBeginWithName: @\"" << argsname << "\"];" << endl;
+  out << indent() << "if (![outProtocol writeStructBeginWithName: @\"" << argsname
+                  << "\" error: __thriftError]) return NO;" << endl;
 
   // write out function parameters
   t_struct* arg_struct = tfunction->get_arglist();
@@ -1428,14 +1537,14 @@ void t_cocoa_generator::generate_cocoa_service_client_send_function_implementati
       out << indent() << "if (" << fieldName << " != nil)";
       scope_up(out);
     }
-    out << indent() << "[outProtocol writeFieldBeginWithName: @\"" << fieldName
+    out << indent() << "if (![outProtocol writeFieldBeginWithName: @\"" << fieldName
         << "\""
            " type: " << type_to_enum((*fld_iter)->get_type())
-        << " fieldID: " << (*fld_iter)->get_key() << "];" << endl;
+        << " fieldID: " << (*fld_iter)->get_key() << " error: __thriftError]) return NO;" << endl;
 
     generate_serialize_field(out, *fld_iter, fieldName);
 
-    out << indent() << "[outProtocol writeFieldEnd];" << endl;
+    out << indent() << "if (![outProtocol writeFieldEnd: __thriftError]) return NO;" << endl;
 
     if (type_can_be_null((*fld_iter)->get_type())) {
       indent_down();
@@ -1443,63 +1552,91 @@ void t_cocoa_generator::generate_cocoa_service_client_send_function_implementati
     }
   }
 
-  out << indent() << "[outProtocol writeFieldStop];" << endl;
-  out << indent() << "[outProtocol writeStructEnd];" << endl;
-  out << indent() << "[outProtocol writeMessageEnd];" << endl;
+  out << indent() << "if (![outProtocol writeFieldStop: __thriftError]) return NO;" << endl;
+  out << indent() << "if (![outProtocol writeStructEnd: __thriftError]) return NO;" << endl;
+  out << indent() << "if (![outProtocol writeMessageEnd: __thriftError]) return NO;" << endl;
+  out << indent() << "return YES;" << endl;
   scope_down(out);
   out << endl;
 }
 
 void t_cocoa_generator::generate_cocoa_service_client_recv_function_implementation(
     ofstream& out,
-    t_function* tfunction) {
-  t_struct noargs(program_);
-  t_function recv_function(tfunction->get_returntype(),
-                           string("recv_") + tfunction->get_name(),
-                           &noargs,
-                           tfunction->get_xceptions());
+    t_service* tservice,
+    t_function* tfunction,
+    bool needs_protocol) {
+
+  
   // Open function
-  indent(out) << "- " << function_signature(&recv_function) << endl;
+  indent(out) << "- (BOOL) recv_" << tfunction->get_name();
+  if (!tfunction->get_returntype()->is_void()) {
+    out << ": (" << type_name(tfunction->get_returntype(), false, true) << " *) result ";
+    if (needs_protocol) {
+      out << "protocol";
+    } else {
+      out << "error";
+    }
+  }
+  if (needs_protocol) {
+    out << ": (id<TProtocol>) inProtocol error";
+  }
+  out << ": (NSError *__autoreleasing *)__thriftError" << endl;
   scope_up(out);
 
   // TODO(mcslee): Message validation here, was the seqid etc ok?
 
   // check for an exception
-  out << indent() << "TApplicationException * x = [self checkIncomingMessageException];" << endl
-      << indent() << "if (x != nil)";
+  out << indent() << "NSError *incomingException = [self checkIncomingMessageException: inProtocol];" << endl
+      << indent() << "if (incomingException)";
+  scope_up(out);
+  out << indent() << "if (__thriftError)";
   scope_up(out);
-  out << indent() << "@throw x;" << endl;
+  out << indent() << "*__thriftError = incomingException;" << endl;
+  scope_down(out);
+  out << indent() << "return NO;" << endl;
   scope_down(out);
 
   // FIXME - could optimize here to reduce creation of temporary objects.
-  string resultname = function_result_helper_struct_type(tfunction);
-  out << indent() << cocoa_prefix_ << resultname << " * result = [[[" << cocoa_prefix_ << resultname
-      << " alloc] init] autorelease_stub];" << endl;
-  indent(out) << "[result read: inProtocol];" << endl;
-  indent(out) << "[inProtocol readMessageEnd];" << endl;
+  string resultname = function_result_helper_struct_type(tservice, tfunction);
+  out << indent() << cocoa_prefix_ << resultname << " * resulter = [" << cocoa_prefix_ << resultname << " new];" << endl;
+  indent(out) << "if (![resulter read: inProtocol error: __thriftError]) return NO;" << endl;
+  indent(out) << "if (![inProtocol readMessageEnd: __thriftError]) return NO;" << endl;
 
   // Careful, only return _result if not a void function
   if (!tfunction->get_returntype()->is_void()) {
-    out << indent() << "if ([result successIsSet]) {" << endl << indent()
-        << "  return [result success];" << endl << indent() << "}" << endl;
+    out << indent() << "if (resulter.successIsSet)";
+    scope_up(out);
+    out << indent() << "*result = resulter.success;" << endl;
+    out << indent() << "return YES;" << endl;
+    scope_down(out);
   }
 
   t_struct* xs = tfunction->get_xceptions();
   const std::vector<t_field*>& xceptions = xs->get_members();
   vector<t_field*>::const_iterator x_iter;
   for (x_iter = xceptions.begin(); x_iter != xceptions.end(); ++x_iter) {
-    out << indent() << "if ([result " << (*x_iter)->get_name() << "IsSet]) {" << endl << indent()
-        << "  @throw [result " << (*x_iter)->get_name() << "];" << endl << indent() << "}" << endl;
+    out << indent() << "if (resulter." << (*x_iter)->get_name() << "IsSet)";
+    scope_up(out);
+    out << indent() << "if (__thriftError)";
+    scope_up(out);
+    out << indent() << "*__thriftError = [resulter " << (*x_iter)->get_name() << "];" << endl;
+    scope_down(out);
+    out << indent() << "return NO;" << endl;
+    scope_down(out);
   }
 
   // If you get here it's an exception, unless a void function
   if (tfunction->get_returntype()->is_void()) {
-    indent(out) << "return;" << endl;
+    indent(out) << "return YES;" << endl;
   } else {
-    out << indent() << "@throw [TApplicationException exceptionWithType: "
-                       "TApplicationException_MISSING_RESULT" << endl << indent()
-        << "                                         reason: @\"" << tfunction->get_name()
-        << " failed: unknown result\"];" << endl;
+    out << indent() << "if (__thriftError)";
+    scope_up(out);
+    out << indent() << "*__thriftError = [NSError errorWithDomain: TApplicationErrorDomain" << endl
+        << indent() << "                                     code: TApplicationErrorMissingResult" << endl
+        << indent() << "                                 userInfo: @{TApplicationErrorMethodKey: @\""
+        << tfunction->get_name() << "\"}];" << endl;
+    scope_down(out);
+    out << indent() << "return NO;" << endl;
   }
 
   // Close function
@@ -1513,12 +1650,13 @@ void t_cocoa_generator::generate_cocoa_service_client_recv_function_implementati
  * @param tfunction The service to generate an implementation for
  */
 void t_cocoa_generator::generate_cocoa_service_client_send_function_invocation(
-    ofstream& out,
-    t_function* tfunction) {
+                                                                               ofstream& out,
+                                                                               t_function* tfunction) {
+  
   t_struct* arg_struct = tfunction->get_arglist();
   const vector<t_field*>& fields = arg_struct->get_members();
   vector<t_field*>::const_iterator fld_iter;
-  indent(out) << "[self send_" << tfunction->get_name();
+  out << indent() << "if (![self send_" << tfunction->get_name();
   bool first = true;
   for (fld_iter = fields.begin(); fld_iter != fields.end(); ++fld_iter) {
     string fieldName = (*fld_iter)->get_name();
@@ -1530,7 +1668,45 @@ void t_cocoa_generator::generate_cocoa_service_client_send_function_invocation(
       out << fieldName << ": " << fieldName;
     }
   }
-  out << "];" << endl;
+  if (!fields.empty()) {
+    out << " error";
+  }
+  out << ": __thriftError]) " << invalid_return_statement(tfunction) << endl;
+}
+
+/**
+ * Generates an invocation of a given 'send_' function.
+ *
+ * @param tfunction The service to generate an implementation for
+ */
+void t_cocoa_generator::generate_cocoa_service_client_send_async_function_invocation(
+                                                                                     ofstream& out,
+                                                                                     t_function* tfunction,
+                                                                                     string failureBlockName) {
+  
+  t_struct* arg_struct = tfunction->get_arglist();
+  const vector<t_field*>& fields = arg_struct->get_members();
+  vector<t_field*>::const_iterator fld_iter;
+  out << indent() << "if (![self send_" << tfunction->get_name();
+  bool first = true;
+  for (fld_iter = fields.begin(); fld_iter != fields.end(); ++fld_iter) {
+    string fieldName = (*fld_iter)->get_name();
+    out << " ";
+    if (first) {
+      first = false;
+      out << ": " << fieldName;
+    } else {
+      out << fieldName << ": " << fieldName;
+    }
+  }
+  if (!fields.empty()) {
+    out << " protocol";
+  }
+  out << ": protocol error: &thriftError]) ";
+  scope_up(out);
+  out << indent() << failureBlockName << "(thriftError);" << endl
+      << indent() << "return;" << endl;
+  scope_down(out);
 }
 
 /**
@@ -1540,7 +1716,20 @@ void t_cocoa_generator::generate_cocoa_service_client_send_function_invocation(
  */
 void t_cocoa_generator::generate_cocoa_service_client_implementation(ofstream& out,
                                                                      t_service* tservice) {
-  out << "@implementation " << cocoa_prefix_ << tservice->get_name() << "Client" << endl;
+  
+  string name = cocoa_prefix_ + tservice->get_name() + "Client";
+  
+  out << "@interface " << name << " () ";
+  scope_up(out);
+  out << endl;
+  out << indent() << "id<TProtocol> inProtocol;" << endl;
+  out << indent() << "id<TProtocol> outProtocol;" << endl;
+  out << endl;
+  scope_down(out);
+  out << endl;
+  out << "@end" << endl << endl;
+  
+  out << "@implementation " << name << endl;
 
   // initializers
   out << "- (id) initWithProtocol: (id <TProtocol>) protocol" << endl;
@@ -1553,8 +1742,11 @@ void t_cocoa_generator::generate_cocoa_service_client_implementation(ofstream& o
          "anOutProtocol" << endl;
   scope_up(out);
   out << indent() << "self = [super init];" << endl;
-  out << indent() << "inProtocol = [anInProtocol retain_stub];" << endl;
-  out << indent() << "outProtocol = [anOutProtocol retain_stub];" << endl;
+  out << indent() << "if (self) ";
+  scope_up(out);
+  out << indent() << "inProtocol = anInProtocol;" << endl;
+  out << indent() << "outProtocol = anOutProtocol;" << endl;
+  scope_down(out);
   out << indent() << "return self;" << endl;
   scope_down(out);
   out << endl;
@@ -1564,29 +1756,40 @@ void t_cocoa_generator::generate_cocoa_service_client_implementation(ofstream& o
   vector<t_function*>::const_iterator f_iter;
   for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
 
-    generate_cocoa_service_client_send_function_implementation(out, *f_iter);
+    generate_cocoa_service_client_send_function_implementation(out, tservice, *f_iter, false);
 
     if (!(*f_iter)->is_oneway()) {
-      generate_cocoa_service_client_recv_function_implementation(out, *f_iter);
+      generate_cocoa_service_client_recv_function_implementation(out, tservice, *f_iter, false);
     }
 
     // Open function
-    indent(out) << "- " << function_signature(*f_iter) << endl;
+    indent(out) << "- " << function_signature(*f_iter, true) << endl;
     scope_up(out);
     generate_cocoa_service_client_send_function_invocation(out, *f_iter);
 
-    out << indent() << "[[outProtocol transport] flush];" << endl;
+    out << indent() << "if (![[outProtocol transport] flush: __thriftError]) " << invalid_return_statement(*f_iter) << endl;
     if (!(*f_iter)->is_oneway()) {
-      out << indent();
-      if (!(*f_iter)->get_returntype()->is_void()) {
-        out << "return ";
+      if ((*f_iter)->get_returntype()->is_void()) {
+        out << indent() << "if (![self recv_" << (*f_iter)->get_name() << ": __thriftError]) return NO;" << endl;
+        out << indent() << "return YES;" << endl;
+      } else {
+        out << indent() << type_name((*f_iter)->get_returntype(), false, true) << " __result;" << endl
+            << indent() << "if (![self recv_" << (*f_iter)->get_name() << ": &__result error: __thriftError]) "
+            << invalid_return_statement(*f_iter) << endl;
+        if (type_can_be_null((*f_iter)->get_returntype())) {
+          out << indent() << "return __result;" << endl;
+        } else {
+          out << indent() << "return @(__result);" << endl;
+        }
       }
-      out << "[self recv_" << (*f_iter)->get_name() << "];" << endl;
+    }
+    else {
+      out << indent() << "return YES;" << endl;
     }
     scope_down(out);
     out << endl;
   }
-  indent_down();
+
   out << "@end" << endl << endl;
 }
 
@@ -1597,16 +1800,30 @@ void t_cocoa_generator::generate_cocoa_service_client_implementation(ofstream& o
  */
 void t_cocoa_generator::generate_cocoa_service_client_async_implementation(ofstream& out,
                                                                            t_service* tservice) {
-  out << "@implementation " << cocoa_prefix_ << tservice->get_name() << "ClientAsync" << endl
-      << endl << "- (id) initWithProtocolFactory: (id <TProtocolFactory>) factory "
-                 "transport: (id <TAsyncTransport>) transport;" << endl;
+  
+  string name = cocoa_prefix_ + tservice->get_name() + "ClientAsync";
+
+  out << "@interface " << name << " () ";
+  scope_up(out);
+  out << endl;
+  out << indent() << "id<TProtocolFactory> protocolFactory;" << endl;
+  out << indent() << "id<TAsyncTransportFactory> transportFactory;" << endl;
+  out << endl;
+  scope_down(out);
+  out << endl;
+  out << "@end" << endl << endl;
+  
+  
+  out << "@implementation " << name << endl
+      << endl << "- (id) initWithProtocolFactory: (id <TProtocolFactory>) aProtocolFactory "
+                 "transportFactory: (id <TAsyncTransportFactory>) aTransportFactory;" << endl;
 
   scope_up(out);
   out << indent() << "self = [super init];" << endl;
-  out << indent() << "inProtocol = [[factory newProtocolOnTransport:transport] retain_stub];"
-      << endl;
-  out << indent() << "outProtocol = inProtocol;" << endl;
-  out << indent() << "asyncTransport = transport;" << endl;
+  out << indent() << "if (self) {" << endl;
+  out << indent() << "  protocolFactory = aProtocolFactory;" << endl;
+  out << indent() << "  transportFactory = aTransportFactory;" << endl;
+  out << indent() << "}" << endl;
   out << indent() << "return self;" << endl;
   scope_down(out);
   out << endl;
@@ -1616,57 +1833,120 @@ void t_cocoa_generator::generate_cocoa_service_client_async_implementation(ofstr
   vector<t_function*>::const_iterator f_iter;
   for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
 
-    generate_cocoa_service_client_send_function_implementation(out, *f_iter);
+    generate_cocoa_service_client_send_function_implementation(out, tservice, *f_iter, true);
 
     if (!(*f_iter)->is_oneway()) {
-      generate_cocoa_service_client_recv_function_implementation(out, *f_iter);
+      generate_cocoa_service_client_recv_function_implementation(out, tservice, *f_iter, true);
     }
 
     // Open function
-    indent(out) << "- " << async_function_signature(*f_iter) << endl;
+    indent(out) << "- " << async_function_signature(*f_iter, false) << endl;
     scope_up(out);
-    indent(out) << "@try {" << endl;
-    indent_up();
-    generate_cocoa_service_client_send_function_invocation(out, *f_iter);
-    indent_down();
-    out << indent() << "} @catch(TException * texception) {" << endl;
-    indent_up();
-    out << indent() << "failureBlock(texception);" << endl << indent() << "return;" << endl;
-    indent_down();
-    indent(out) << "}" << endl;
-
-    out << indent() << "[asyncTransport flush:^{" << endl;
-    indent_up();
+    
+    out << indent() << "NSError *thriftError;" << endl
+        << indent() << "id<TAsyncTransport> transport = [transportFactory newTransport];" << endl
+        << indent() << "id<TProtocol> protocol = [protocolFactory newProtocolOnTransport:transport];" << endl
+        << endl;
+    
+    generate_cocoa_service_client_send_async_function_invocation(out, *f_iter, "failureBlock");
 
-    out << indent() << "@try {" << endl;
+    out << indent() << "[transport flushWithCompletion:^{" << endl;
     indent_up();
 
-    string recv_invocation = "[self recv_" + (*f_iter)->get_name() + "]";
-    if (!(*f_iter)->is_oneway() && (*f_iter)->get_returntype()->is_void()) {
-      out << indent() << recv_invocation << ";" << endl;
+    if (!(*f_iter)->is_oneway()) {
+      out << indent() << "NSError *thriftError;" << endl;
+      
+      if (!(*f_iter)->get_returntype()->is_void()) {
+        out << indent() << type_name((*f_iter)->get_returntype()) << " result;" << endl;
+      }
+      out << indent() << "if (![self recv_" << (*f_iter)->get_name();
+      if (!(*f_iter)->get_returntype()->is_void()) {
+        out << ": &result protocol";
+      }
+      out << ": protocol error: &thriftError]) ";
+      scope_up(out);
+      out << indent() << "failureBlock(thriftError);" << endl
+          << indent() << "return;" << endl;
+      scope_down(out);
     }
+    
     out << indent() << "responseBlock(";
     if (!(*f_iter)->is_oneway() && !(*f_iter)->get_returntype()->is_void()) {
-      out << recv_invocation;
+      out << "result";
     }
     out << ");" << endl;
 
     indent_down();
-
-    out << indent() << "} @catch(TException * texception) {" << endl;
-    indent_up();
-
-    out << indent() << "failureBlock(texception);" << endl;
-
-    indent_down();
-    out << indent() << "}" << endl;
-
-    indent_down();
+    
     out << indent() << "} failure:failureBlock];" << endl;
-
+    
     scope_down(out);
 
     out << endl;
+    
+    // Promise function
+    if (promise_kit_) {
+      
+      indent(out) << "- " << promise_function_signature(*f_iter) << endl;
+      scope_up(out);
+      
+      out << indent() << "return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolver) {" << endl;
+      indent_up();
+      
+      out << indent() << "NSError *thriftError;" << endl
+          << indent() << "id<TAsyncTransport> transport = [transportFactory newTransport];" << endl
+          << indent() << "id<TProtocol> protocol = [protocolFactory newProtocolOnTransport:transport];" << endl
+          << endl;
+      
+      generate_cocoa_service_client_send_async_function_invocation(out, *f_iter, "resolver");
+      
+      out << indent() << "[transport flushWithCompletion:^{" << endl;
+      indent_up();
+      
+      if (!(*f_iter)->is_oneway()) {
+        out << indent() << "NSError *thriftError;" << endl;
+        
+        if (!(*f_iter)->get_returntype()->is_void()) {
+          out << indent() << type_name((*f_iter)->get_returntype()) << " result;" << endl;
+        }
+        out << indent() << "if (![self recv_" << (*f_iter)->get_name();
+        if (!(*f_iter)->get_returntype()->is_void()) {
+          out << ": &result protocol";
+        }
+        out << ": protocol error: &thriftError]) ";
+        scope_up(out);
+        out << indent() << "resolver(thriftError);" << endl
+            << indent() << "return;" << endl;
+        scope_down(out);
+      }
+      
+      out << indent() << "resolver(";
+      if ((*f_iter)->is_oneway() || (*f_iter)->get_returntype()->is_void()) {
+        out << "@YES";
+      } else if (type_can_be_null((*f_iter)->get_returntype())) {
+        out << "result";
+      } else {
+        out << "@(result)";
+      }
+      out << ");" << endl;
+      
+      indent_down();
+      
+      out << indent() << "} failure:^(NSError *error) {" << endl;
+      indent_up();
+      out << indent() << "resolver(error);" << endl;
+      indent_down();
+      out << indent() << "}];" << endl;
+      
+      indent_down();
+      out << indent() << "}];" << endl;
+      
+      scope_down(out);
+      
+      out << endl;
+      
+    }
+    
   }
 
   out << "@end" << endl << endl;
@@ -1680,19 +1960,29 @@ void t_cocoa_generator::generate_cocoa_service_client_async_implementation(ofstr
  */
 void t_cocoa_generator::generate_cocoa_service_server_implementation(ofstream& out,
                                                                      t_service* tservice) {
-  out << "@implementation " << cocoa_prefix_ << tservice->get_name() << "Processor" << endl;
+  
+  string name = cocoa_prefix_ + tservice->get_name() + "Processor";
+  
+  out << "@interface " << name << " () ";
+  
+  scope_up(out);
+  out << indent() << "id <" << cocoa_prefix_ << tservice->get_name() << "> service;" << endl;
+  out << indent() << "NSDictionary * methodMap;" << endl;
+  scope_down(out);
+  
+  out << "@end" << endl << endl;
+  
+  out << "@implementation " << name << endl;
 
   // initializer
   out << endl;
-  out << "- (id) initWith" << tservice->get_name() << ": (id <" << cocoa_prefix_
-      << tservice->get_name() << ">) service" << endl;
+  out << "- (id) initWith" << tservice->get_name() << ": (id <" << cocoa_prefix_ << tservice->get_name() << ">) aService" << endl;
   scope_up(out);
   out << indent() << "self = [super init];" << endl;
-  out << indent() << "if (!self) {" << endl;
-  out << indent() << "  return nil;" << endl;
-  out << indent() << "}" << endl;
-  out << indent() << "mService = [service retain_stub];" << endl;
-  out << indent() << "mMethodMap = [[NSMutableDictionary dictionary] retain_stub];" << endl;
+  out << indent() << "if (self) ";
+  scope_up(out);
+  out << indent() << "service = aService;" << endl;
+  out << indent() << "methodMap = [NSMutableDictionary dictionary];" << endl;
 
   // generate method map for routing incoming calls
   vector<t_function*> functions = tservice->get_functions();
@@ -1700,16 +1990,15 @@ void t_cocoa_generator::generate_cocoa_service_server_implementation(ofstream& o
   for (f_iter = functions.begin(); f_iter != functions.end(); ++f_iter) {
     string funname = (*f_iter)->get_name();
     scope_up(out);
-    out << indent() << "SEL s = @selector(process_" << funname
-        << "_withSequenceID:inProtocol:outProtocol:);" << endl;
+    out << indent() << "SEL s = @selector(process_" << funname << "_withSequenceID:inProtocol:outProtocol:error:);" << endl;
     out << indent() << "NSMethodSignature * sig = [self methodSignatureForSelector: s];" << endl;
-    out << indent()
-        << "NSInvocation * invocation = [NSInvocation invocationWithMethodSignature: sig];" << endl;
+    out << indent() << "NSInvocation * invocation = [NSInvocation invocationWithMethodSignature: sig];" << endl;
     out << indent() << "[invocation setSelector: s];" << endl;
     out << indent() << "[invocation retainArguments];" << endl;
-    out << indent() << "[mMethodMap setValue: invocation forKey: @\"" << funname << "\"];" << endl;
+    out << indent() << "[methodMap setValue: invocation forKey: @\"" << funname << "\"];" << endl;
     scope_down(out);
   }
+  scope_down(out);
   out << indent() << "return self;" << endl;
   scope_down(out);
 
@@ -1718,33 +2007,36 @@ void t_cocoa_generator::generate_cocoa_service_server_implementation(ofstream& o
   out << endl;
   out << indent() << "- (id<" << cocoa_prefix_ << tservice->get_name() << ">) service" << endl;
   out << indent() << "{" << endl;
-  out << indent() << "  return [[mService retain_stub] autorelease_stub];" << endl;
+  out << indent() << "  return service;" << endl;
   out << indent() << "}" << endl;
 
   // implementation of the TProcess method, which dispatches the incoming call using the method map
   out << endl;
   out << indent() << "- (BOOL) processOnInputProtocol: (id <TProtocol>) inProtocol" << endl;
   out << indent() << "                 outputProtocol: (id <TProtocol>) outProtocol" << endl;
+  out << indent() << "                          error: (NSError *__autoreleasing *)__thriftError" << endl;
   out << indent() << "{" << endl;
   out << indent() << "  NSString * messageName;" << endl;
-  out << indent() << "  int messageType;" << endl;
-  out << indent() << "  int seqID;" << endl;
-  out << indent() << "  [inProtocol readMessageBeginReturningName: &messageName" << endl;
+  out << indent() << "  SInt32 messageType;" << endl;
+  out << indent() << "  SInt32 seqID;" << endl;
+  out << indent() << "  if (![inProtocol readMessageBeginReturningName: &messageName" << endl;
   out << indent() << "                                       type: &messageType" << endl;
-  out << indent() << "                                 sequenceID: &seqID];" << endl;
-  out << indent() << "  NSInvocation * invocation = [mMethodMap valueForKey: messageName];" << endl;
+  out << indent() << "                                 sequenceID: &seqID" << endl;
+  out << indent() << "                                      error: __thriftError]) return NO;" << endl;
+  out << indent() << "  NSInvocation * invocation = [methodMap valueForKey: messageName];" << endl;
   out << indent() << "  if (invocation == nil) {" << endl;
-  out << indent() << "    [TProtocolUtil skipType: TType_STRUCT onProtocol: inProtocol];" << endl;
-  out << indent() << "    [inProtocol readMessageEnd];" << endl;
-  out << indent() << "    TApplicationException * x = [TApplicationException exceptionWithType: "
-                     "TApplicationException_UNKNOWN_METHOD reason: [NSString stringWithFormat: "
-                     "@\"Invalid method name: '%@'\", messageName]];" << endl;
-  out << indent() << "    [outProtocol writeMessageBeginWithName: messageName" << endl;
-  out << indent() << "                                      type: TMessageType_EXCEPTION" << endl;
-  out << indent() << "                                sequenceID: seqID];" << endl;
-  out << indent() << "    [x write: outProtocol];" << endl;
-  out << indent() << "    [outProtocol writeMessageEnd];" << endl;
-  out << indent() << "    [[outProtocol transport] flush];" << endl;
+  out << indent() << "    if (![TProtocolUtil skipType: TTypeSTRUCT onProtocol: inProtocol error: __thriftError]) return NO;" << endl;
+  out << indent() << "    if (![inProtocol readMessageEnd: __thriftError]) return NO;" << endl;
+  out << indent() << "    NSError * x = [NSError errorWithDomain: TApplicationErrorDomain" << endl;
+  out << indent() << "                                      code: TApplicationErrorUnknownMethod" << endl;
+  out << indent() << "                                  userInfo: @{TApplicationErrorMethodKey: messageName}];" << endl;
+  out << indent() << "    if (![outProtocol writeMessageBeginWithName: messageName" << endl;
+  out << indent() << "                                           type: TMessageTypeEXC

<TRUNCATED>