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Posted to commits@directory.apache.org by el...@apache.org on 2018/01/23 00:08:24 UTC
svn commit: r1821949 - in
/directory/site/trunk/content/api/internal-design-guide:
14-extended-operations.mdtext images/extended-request-decorator.graphml
images/extended-request-decorator.png
Author: elecharny
Date: Tue Jan 23 00:08:24 2018
New Revision: 1821949
URL: http://svn.apache.org/viewvc?rev=1821949&view=rev
Log:
Added the first part of the extended operation doco
Added:
directory/site/trunk/content/api/internal-design-guide/images/extended-request-decorator.graphml
directory/site/trunk/content/api/internal-design-guide/images/extended-request-decorator.png (with props)
Modified:
directory/site/trunk/content/api/internal-design-guide/14-extended-operations.mdtext
Modified: directory/site/trunk/content/api/internal-design-guide/14-extended-operations.mdtext
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/internal-design-guide/14-extended-operations.mdtext?rev=1821949&r1=1821948&r2=1821949&view=diff
==============================================================================
--- directory/site/trunk/content/api/internal-design-guide/14-extended-operations.mdtext (original)
+++ directory/site/trunk/content/api/internal-design-guide/14-extended-operations.mdtext Tue Jan 23 00:08:24 2018
@@ -24,4 +24,101 @@ Notice: Licensed to the Apache Software
# 14 - Extended Operations
-TODO...
\ No newline at end of file
+**Extended Operation** is a **LDAP** message which may content a payload. It is generally sent by the clinet, but the server can send a _ExtendedResponse_ as a response to any operation : the **Notice of Disconnection**.
+
+Here is the syntax for the extended Operation :
+
+ :::Text
+ ExtendedRequest ::= [APPLICATION 23] SEQUENCE {
+ requestName [0] LDAPOID,
+ requestValue [1] OCTET STRING OPTIONAL }
+
+ ExtendedResponse ::= [APPLICATION 24] SEQUENCE {
+ COMPONENTS OF LDAPResult,
+ responseName [10] LDAPOID OPTIONAL,
+ responseValue [11] OCTET STRING OPTIONAL }
+
+(the payload is the _requestValue_ or _responseValue_ part, which may be **BER** encoded).
+
+This message is routinely decoded as is by the standard **LDAP** message decoder, but the payload has to be decoded on its own.
+
+## Supported extended operations
+
+Currently, the **LDAP API** support the following extended operations :
+
+* _Cancel_ request and response ([RFC 3909](https://tools.ietf.org/html/rfc3909))
+* _CertGenerationRequest_ request and response, an **ApacheDS** specific operation in charge of generating a certificate
+* _GracefulDisconnect_ response, an **ApacheDS** specific operation used when the server is shutdown properly
+* _GracefulShutdown_ request and response, an **ApacheDS** specific operation used to shutdown the remote server properly
+* _PasswordModify_ request and response ([RFC 3062](https://tools.ietf.org/html/rfc3062))
+* _StartTls_ request and response ([RFC 4511](https://tools.ietf.org/html/rfc4511))
+* _StoredProcedure_ request and response, an **ApacheDS** specific operation used to execute a stored procedure on the server
+* _WhoAmI_ request and response ([RFC 4532](https://tools.ietf.org/html/rfc4532))
+
+
+## Encoding and decoding
+
+When the _requestValue_ part is present, it has to be encoded (when the client sends the request to the srrver) or decoded ( when the client receives the response from the server).
+
+### Decoding a request
+
+The payload is decoded on the fly when the request is processed during the _extendedRequest_ is being decoded. The _StoreExtendedRequestValue_ will store the _byte[]_ - if any - and depending on the operation, the specific request will decode the value. Here is the _action_ method for the _StoreExtendedRequestValue_ class :
+
+
+ :::Java
+ public void action( LdapMessageContainer<ExtendedRequestDecorator<?>> container ) throws DecoderException
+ {
+ // We can allocate the ExtendedRequest Object
+ ExtendedRequestDecorator<?> extendedRequest = container.getMessage();
+
+ // Get the Value and store it in the ExtendedRequest
+ TLV tlv = container.getCurrentTLV();
+
+ // We have to handle the special case of a 0 length matched
+ // value
+ if ( tlv.getLength() == 0 )
+ {
+ extendedRequest.setRequestValue( Strings.EMPTY_BYTES );
+ }
+ else
+ {
+ extendedRequest.setRequestValue( tlv.getValue().getData() );
+ }
+
+Each implementaion may have a _setRequestValue_ methd, overloading the parentclass. In this case, the value is decoded by the method.
+
+Here is an example of _setRequestValue_ implementation (for the _PasswordModifyRequest_ class) :
+
+ :::Java
+ public void setRequestValue( byte[] requestValue )
+ {
+ PasswordModifyRequestDecoder decoder = new PasswordModifyRequestDecoder();
+
+ try
+ {
+ if ( requestValue != null )
+ {
+ passwordModifyRequest = decoder.decode( requestValue );
+
+ this.requestValue = new byte[requestValue.length];
+ System.arraycopy( requestValue, 0, this.requestValue, 0, requestValue.length );
+ }
+ else
+ {
+ this.requestValue = null;
+ }
+ }
+ catch ( DecoderException e )
+ {
+ LOG.error( I18n.err( I18n.ERR_04165 ), e );
+ throw new RuntimeException( e );
+ }
+ }
+
+As we can see, the decoder is invoked if the _requestValye_ bytes is not null. It instanciate a _PasswordModifyRequest_.
+
+If there is no payload, the parent's method is invoked (which basically does nothing).
+
+Here is a schema showing which operation as a payload that needs to be decoded :
+
+
Added: directory/site/trunk/content/api/internal-design-guide/images/extended-request-decorator.graphml
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/internal-design-guide/images/extended-request-decorator.graphml?rev=1821949&view=auto
==============================================================================
--- directory/site/trunk/content/api/internal-design-guide/images/extended-request-decorator.graphml (added)
+++ directory/site/trunk/content/api/internal-design-guide/images/extended-request-decorator.graphml Tue Jan 23 00:08:24 2018
@@ -0,0 +1,344 @@
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+ <y:SmartNodeLabelModel distance="4.0"/>
+ </y:LabelModel>
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+ <y:SmartNodeLabelModel distance="4.0"/>
+ </y:LabelModel>
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