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3.3.2 Sequence of Events

The following diagram shows the sequence of events for reliable messaging with TCP as the transport.

Reliable messaging with TCP as transport

Figure 18: Reliable messaging with TCP as transport

  1. The RM Source (RMS) sends a CreateSequence message, as specified in [WSRM1-1] section 3.4, to the RM Destination (RMD).

  2. The RMD sends a CreateSequenceResponse message, as specified in [WSRM1-1] section 3.4, to the RMS.

  3. The RMS sends the first message to the RMD with MessageNumber = 1 and an <AckRequested> element header block in the header to signal to the RMD that the RMS is requesting a <SequenceAcknowledgement> element to be returned, as specified in [WSRM1-1] section 3.3.

     <r:AckRequested>
    <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
 </r:AckRequested>
 <r:Sequence s:mustUnderstand="1">
    <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
    <r:MessageNumber>1</r:MessageNumber>
 </r:Sequence>

  4. The RMD responds with acknowledgement range = 1, 1 in a <SequenceAcknowledgement> element header block, as specified in [WSRM1-1] section 3.2.

     <r:SequenceAcknowledgement>
    <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
    <r:AcknowledgementRange Lower="1" Upper="1"/>
 </r:SequenceAcknowledgement>
 

  5. The RMS sends a second message to the RMD with MessageNumber = 2 and an <AckRequested> element header block in the header to signal to the RMD that the RMS is requesting that a <SequenceAcknowledgement> element be returned, as specified in [WSRM1-1] section 3.3.

      
 <r:AckRequested>
    <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
 </r:AckRequested>
 <r:Sequence s:mustUnderstand="1">
    <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
    <r:MessageNumber>2</r:MessageNumber>
 </r:Sequence>
 

  6. The RMD responds with acknowledgement range = 1, 2 in <SequenceAcknowledgement> element header block, as specified in [WSRM1-1] section 3.2.

      
 <r:SequenceAcknowledgement>
    <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
    <r:AcknowledgementRange Lower="1" Upper="2"/>
 </r:SequenceAcknowledgement>
 

  7. The RMS sends the last message to RMD with MessageNumber = 3 and an <AckRequested> element header block in the header to signal to the RMD that the RMS is requesting that a <SequenceAcknowledgement> element be returned, as in [WSRM1-1] section 3.3. It adds a <LastMessage> element in the sequence block to indicate to the RMD that this message is the last message in the sequence.

      
 <s:Envelope>
   <s:Header>
  
   <!-- ... -->
  
       <r:Sequence s:mustUnderstand="1">
          <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
          <r:MessageNumber>3</r:MessageNumber>
          <r:LastMessage />
       </r:Sequence>
       <a:Action s:mustUnderstand="1">
           http://schemas.xmlsoap.org/ws/2005/02/rm/LastMessage
       </a:Action>
       <a:To s:mustUnderstand="1">
           net.tcp://10.185.189.61:9000/servicemodelsamples/service
       </a:To>
    </s:Header>
    <s:Body />
 </s:Envelope>
 

  8. The RMD responds with an acknowledgement range = 1, 3 in the <SequenceAcknowledgement> element header block, as specified in [WSRM1-1] section 3.2.

      
 <r:SequenceAcknowledgement>
    <r:Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</r:Identifier>
    <r:AcknowledgementRange Lower="1" Upper="3"/>
 </r:SequenceAcknowledgement>
 

  9. After receiving acknowledgement of the last message, RMS sends a <TerminateSequence> element, as specified in [WSRM1-1] section 3.5.

     <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" 
             xmlns:a="http://www.w3.org/2005/08/addressing">
    <s:Header>
       <a:Action s:mustUnderstand="1">
           http://schemas.xmlsoap.org/ws/2005/02/rm/TerminateSequence
       </a:Action>
       <a:To s:mustUnderstand="1">
           net.tcp://10.185.189.61:9000/servicemodelsamples/service
       </a:To>
    </s:Header>
    <s:Body>
       <TerminateSequence xmlns="http://schemas.xmlsoap.org/ws/2005/02/rm">
          <Identifier>urn:uuid:cd8ea5a2-4867-45ed-bb39-46c4cab2213f</Identifier>
       </TerminateSequence>
    </s:Body>
 </s:Envelope>