Session Support Example

The following code example shows how a DSML Services for Windows session is initiated, maintained, and terminated. For brevity, the actual DSML payload in the SOAP body is eliminated from the example.

Begin the session

To begin the session, the client indicates its intention by sending a BeginSession element in the SOAP header. The mustUnderstand attribute of the SOAP header must be set to 1. If a server does not support BeginSession, per the SOAP specification, it must return a SOAP fault before processing the SOAP body. If the server can establish the session, any DSML operations including the batchRequest envelope can run inside the session. If the server cannot establish a session, a SOAP fault will be returned and no DSML operation will be attempted.

Be aware that you can send an empty DSML payload, such as batchRequest/, with this request, but not an empty SOAP body without a DSML payload, such as SOAP-ENV:Body/. The following code example shows a valid envelope sending an empty payload:


<SOAP-ENV:Envelope
 xmlns:SOAP-ENV=http://schemas.xmlsoap.org/soap/envelope/>
    <SOAP-ENV:Header>
        <ad:BeginSession
         xmlns:ad="urn:schema-microsoft-com:activedirectory:dsmlv2"
         SOAP-ENV:mustUnderstand="1"/>
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
        <batchRequest/> 
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>


The server response

Under normal circumstances, the DSML V2 server/gateway will respond with the Session element and its associated SessionID. When a SessionID is established by the server, it remains constant throughout that particular session.

The server must respond by returning a SOAP fault if:

  • One or more errorResponse conditions occur.
  • The server declines to give a new session to a client.

The following code example shows how the server responds with the sessionID:


<SOAP-ENV:Envelope
 xmlns:SOAP-ENV=http://schemas.xmlsoap.org/soap/envelope/>
    <SOAP-ENV:Header>
        <ad:Session
         xmlns:ad="urn:schema-microsoft-com:activedirectory:dsmlv2"
         ad:SessionID="1534"/>
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
        <entity type="hellip"/> <!<entity type="mdash"/>DSML Payload Here --> 
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>



For each subsequent request, the client can send the sessionID obtained from the server. The client must still set the mustUnderstand SOAP attribute to 1, as shown in the following code example:


<SOAP-ENV:Envelope
 xmlns:SOAP-ENV=http://schemas.xmlsoap.org/soap/envelope/>
    <SOAP-ENV:Header>
        <ad:Session
         xmlns:ad="urn:schema-microsoft-com:activedirectory:dsmlv2"
         ad:SessionID="1534" 
         SOAP-ENV:mustUnderstand="1"/>
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
        <entity type="hellip"/> <!<entity type="mdash"/>DSML Payload Here --> 
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>


The server then processes the request that is running on the specified session. The server can, at any time, refuse to run the requested session. If the server refuses to run a session, it must send the SOAP fault response before processing any DSML operations.

If the server can run a requested session after processing the DSML operation, the server should send the same data as described earlier for the first server response.

End a session

To terminate the session, the client sends the EndSession request as shown in the following code example. This request instructs the server to terminate the session after processing the DSML operations. If there are any DSML operations to be processed, they must be running in the context of session to be terminated.


<SOAP-ENV:Envelope
 xmlns:SOAP-ENV=http://schemas.xmlsoap.org/soap/envelope/>
    <SOAP-ENV:Header>
        <ad:EndSession
         xmlns:ad="urn:schema-microsoft-com:activedirectory:dsmlv2"
         ad:SessionID="1534"
         SOAP-ENV:mustUnderstand="1"/>
    </SOAP-ENV:Header>
    <SOAP-ENV:Body>
        <entity type="hellip"/> <!<entity type="mdash"/>DSML Payload Here --> 
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>


The server acknowledges the EndSession request by returning the SessionID of the session that was terminated. If there is a DSML payload, the server will process the operations based on the SessionID before terminating it.

Rarely, the server can refuse to close the session. If the server cannot close the connection, for example, because of an invalid SessionID, it should respond as a SOAP fault. The server can also time-out and close idle sessions.

It is recommended that clients using a DSML V2 session do so conservatively. If the client no longer requires the session, it should terminate the session as soon as possible. However, the session should not be created and terminated repeatedly over a short period of time, because the resource cost of creating and maintaining sessions on the server side can be great.

Clients must also be prepared to start over from the beginning and resend the session request, by issuing BeginSession, if the server rejects the requested session.

 

 

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