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Posted to commits@directory.apache.org by el...@apache.org on 2018/01/19 22:44:42 UTC
svn commit: r1821721 - in
/directory/site/trunk/content/api/internal-design-guide:
2-general-structure.mdtext 5-network.mdtext images/ldapconnection.graphml
images/ldapconnection.png
Author: elecharny
Date: Fri Jan 19 22:44:42 2018
New Revision: 1821721
URL: http://svn.apache.org/viewvc?rev=1821721&view=rev
Log:
Added the network page
Added:
directory/site/trunk/content/api/internal-design-guide/images/ldapconnection.graphml
directory/site/trunk/content/api/internal-design-guide/images/ldapconnection.png (with props)
Modified:
directory/site/trunk/content/api/internal-design-guide/2-general-structure.mdtext
directory/site/trunk/content/api/internal-design-guide/5-network.mdtext
Modified: directory/site/trunk/content/api/internal-design-guide/2-general-structure.mdtext
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/internal-design-guide/2-general-structure.mdtext?rev=1821721&r1=1821720&r2=1821721&view=diff
==============================================================================
--- directory/site/trunk/content/api/internal-design-guide/2-general-structure.mdtext (original)
+++ directory/site/trunk/content/api/internal-design-guide/2-general-structure.mdtext Fri Jan 19 22:44:42 2018
@@ -27,73 +27,6 @@ Notice: Licensed to the Apache Software
The **Apache LDAP API** is split into many modules. Here is their hierarchy :
-<pre>
-LDAP API root
- |
- +-- all
- |
- +-- asn1
- | |
- | +-- api
- | |
- | +-- ber
- |
- +-- distribution
- |
- +-- dsml
- | |
- | +-- engine
- | |
- | +-- parser
- |
- +-- i18n
- |
- +-- integ
- |
- +-- integ-osgi
- |
- +-- ldap
- | |
- | +-- client
- | | |
- | | +-- all
- | | |
- | | +-- api
- | |
- | +-- codec
- | | |
- | | +-- core
- | | |
- | | +-- standalone
- | |
- | +-- extras
- | | |
- | | +-- aci
- | | |
- | | +-- codec
- | | |
- | | +-- codec-api
- | | |
- | | +--sp
- | | |
- | | +-- trigger
- | | |
- | | +-- util
- | |
- | +-- model
- | |
- | +-- net
- | | |
- | | +-- mina
- | |
- | +-- schema
- | |
- | +-- converter
- | |
- | +-- data
- |
- +-- util
-</pre>
* The **all** module is just a packaging module, gathering all the other modules in one single jar to simplify the work for those who want to use the API. One can import each module speparately, or the **all** module only. Note that it does not include the tests and integration modules (**integ**, **integ-osgi** and **distribution**)
Modified: directory/site/trunk/content/api/internal-design-guide/5-network.mdtext
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/internal-design-guide/5-network.mdtext?rev=1821721&r1=1821720&r2=1821721&view=diff
==============================================================================
--- directory/site/trunk/content/api/internal-design-guide/5-network.mdtext (original)
+++ directory/site/trunk/content/api/internal-design-guide/5-network.mdtext Fri Jan 19 22:44:42 2018
@@ -25,4 +25,166 @@ Notice: Licensed to the Apache Software
# 5 - Network
-TODO...
\ No newline at end of file
+The **Apache LDAP AP** is built on top of [**Apache MINA](http://mina.apache.org) which is a **NIO** framework.
+
+As **MINA** is fully asynchronous, it has some impact on the design of the **LDAP API**. Basically, we send requests, and we don't wait for responses, we get informed when the response is there. Most of the time, the **API** users will want to wait for a response, instead of leveraging the asyncrhonous aspect of the **API**: this is the reason we have a blocking **API**, based on the non-blocking implementation. We will explain the whole thing here.
+
+NOTE : **LDAP** protocol is based on **TCP**, we are not dealing with **UDP** at all.
+
+## Class hierarchy
+
+
+
+
+## MINA usage
+
+There are two aspects we need to consider when it comes to use **MINA** :
+
+* events processing
+* sending a message
+* receiving a message
+* encoding/decoding
+
+### Events processing
+
+**MINA** is an asynchronous framework, which means it's event based : you will receive events when something 'happens' (like, a message is received, etc). The events have to be processed by the **LDAP API**, and the **IoHandler** interface is listing all the events we have to process. Here they are :
+
+* _messageReceived_ : When a message has been fully received from the remote peer
+* _messageSent_ : When a message has been fully sent to the remote peer
+* _exceptionCaught_ : If we git an exception from the network layer
+* _inputClosed_ : When the _Input_ part of a TCP connection has been closed
+* _sessionClosed_ : When a Session is closed
+* _sessionCreated_ : When a Session is created
+* _sessionIdle_ : When a Session is idle
+* _sessionOpened_ : When a Session is opened
+
+The _session_ is created when you connect for the first time, it's atcive until it's closed. We are talking about a **TCP** session, not a **LDAP** session.
+
+So the _LdapNetworkConnection_ class must implement those methods.
+
+Regarding the _messageReceived/messageSent_ methods, it's important to know that we are talking about **FULL** **LDAP** messages, even if **TCP** does not guarantee that messages can't be fragmented : **MINA** deal with fragmentation.
+
+Actually, we only implement the _messageReceived_, _exceptionCaught_, _inputClose_, _sessionCreated_ and _sessionClosed_ methods, the other are handled by the _IoHandlerAdpater_ methods (which does nothing with it).
+
+### Sending a message
+
+There are two modes : **Synchronous** and **Asyncrhonous**. The methods are respectively described in the _LdapConnection_ interface and _LdapAsyncConnection_ interface. Actually, _synchronous_ methods are calling _asynchronous_ methods, which returns a _Future_ :
+
+ :::Java
+ /**
+ * {@inheritDoc}
+ */
+ @Override
+ public AddResponse add( AddRequest addRequest ) throws LdapException
+ {
+ ...
+
+ AddFuture addFuture = addAsync( addRequest );
+
+ // Get the result from the future
+ try
+ {
+ // Read the response, waiting for it if not available immediately
+ // Get the response, blocking
+ AddResponse addResponse = addFuture.get( timeout, TimeUnit.MILLISECONDS );
+
+ if ( addResponse == null )
+ {
+ // We didn't received anything : this is an error
+ LOG.error( "Add failed : timeout occurred" );
+ throw new LdapException( TIME_OUT_ERROR );
+ }
+
+ if ( addResponse.getLdapResult().getResultCode() == ResultCodeEnum.SUCCESS )
+ {
+ // Everything is fine, return the response
+ LOG.debug( "Add successful : {}", addResponse );
+ }
+ else
+ {
+ // We have had an error
+ LOG.debug( "Add failed : {}", addResponse );
+ }
+
+ return addResponse;
+ }
+ catch ( Exception ie )
+ {
+ // Catch all other exceptions
+ // Send an abandon request
+ if ( !addFuture.isCancelled() )
+ {
+ abandon( addRequest.getMessageId() );
+ }
+
+ throw new LdapException( NO_RESPONSE_ERROR, ie );
+ }
+ }
+
+You can see we wait until the timeout expired, or until we got the response, calling the _addAsync_ method, getting back a _Future_ and waiting on it.
+
+This method take a _AddRequest_ but we have other simpler flavors (see the **LDAP API** documentation).
+
+
+ :::Text
+ AddResponse ldapConnection.add( AddResquest )
+ |
+ +-- AddFuture addAsync( AddRequest )
+ | |
+ | +-- connect()
+ | | |
+ | | +-- createConnector()
+ | | | |
+ | | | +-- new NioSocketConnector()
+ | | | |
+ | | | +-- NioSocketConnector.getFilterChain().addLast( "ldapCodec", ldapProtocolFilter );
+ | | | |
+ | | | [+-- addSslFilter()]
+ | | | |
+ | | | +-- NioSocketConnector.setHandler( this )
+ | | |
+ | | +-- IoConnector.connect( address )
+ | |
+ | +-- checkSession()
+ | |
+ | +-- new AddFuture( LdapConnection, ID )
+ | |
+ | +-- addToFutureMap( ID, AddFuture )
+ | |
+ | +-- writeRequest( AddRequest )
+ | |
+ | +-- WriteFuture IoSession.write( request )
+ | |
+ | +-- WriteFuture.awaitUninterruptibly( 100 )
+ |
+ +-- AddFuture.get()
+
+Here, we first create a connection if we don't have one yet, and then we try to write the message to the remote server, and wait for the message to be sent. That means sending message is synchronous, while receiving is aysnchronous by default. (NOTE : This may change in the next version.)
+
+Once the request has been written, we do a _get_ on the returned _Future_. Either we get an _AddResponse_, or an error/timeout.
+
+### Receiving a message
+
+Once the _IoSession.write()_ method is called, we can assume the message has been sent to the remote server (sort of). The response will come as an event : _messageReceived()_, which is implemented in _LdapNetworkConnection_.
+
+Each **LDAP** message has a unique **ID**, and every sent message is associated with a _Future_. When the message is sent, we store a tuple <**ID**, **Future**> in a map, so when the response arrives, we just have to pull the _Future_ from the map using teh message **ID**. This is what we do in the _messageReceived()_ implementation. The response is enqueued in the _Future_ (we may have more than one, typically for **Search** operations).
+
+
+### Encoding/decoding
+
+Messages are encoded and decoded when we send or receive them. This is done by **MINA**, using a callback in the **LDAP API**. That means we configured **MINA** to process **LDAP** messages.
+
+The codec is inserted in **MINA** chain while connecting :
+
+ :::Java
+ /** The Ldap codec protocol filter */
+ private IoFilter ldapProtocolFilter = new ProtocolCodecFilter( codec.getProtocolCodecFactory() );
+
+ private void createConnector() throws LdapException
+ {
+ ...
+
+ // Add the codec to the chain
+ connector.getFilterChain().addLast( "ldapCodec", ldapProtocolFilter );
+
+So the _ProtocolCodecFilter_ class is responsible for initializing the codec (it's a **MINA** class), and here, we use a factory to inject the encoder and decoder instances. This factory is _LdapProtocolCodecFactory_.
\ No newline at end of file
Added: directory/site/trunk/content/api/internal-design-guide/images/ldapconnection.graphml
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/internal-design-guide/images/ldapconnection.graphml?rev=1821721&view=auto
==============================================================================
--- directory/site/trunk/content/api/internal-design-guide/images/ldapconnection.graphml (added)
+++ directory/site/trunk/content/api/internal-design-guide/images/ldapconnection.graphml Fri Jan 19 22:44:42 2018
@@ -0,0 +1,344 @@
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+ <!--Created by yEd 3.17-->
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