Difference between revisions of "Common NetMsg Exchanges"

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This whole page needs to be redone with flow charts!
  
==Application Interconnect Handshake==
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Initial handshake:
This sequence of [[IBME_GeometryService#NetMsg_Class|NetMsg]] exchanges represents the communications between an external application (App M) attempting to connect to a running Geometry Service (App GS).  This sequence assumes success.
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* Server sends [GS Remote Nodename Set]
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* Client sends [GS Remote Nodename Set]
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* Client sends [NewSessionReqMsg] (login/passwd)
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* Server sends [SessionInfoMsg] (uuid of session)
  
===Main Sequence===
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Now ready to process
# App GS waits for incoming socket requests.
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# App M creates a socket connection to App GS.
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# App GS accepts the socket connection.
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# App M and App GS are now connected at the socket level.
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# App M sends a [[RemHostNameSET]] NetMsg to App GS.
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# App GS checks its [[RemHostName]] list for duplicates. '''(Alt #1)'''
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# App GS sends a [[RemHostNameSETOK]] NetMsg to App M.
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# App GS sends a [[RemHostNameSET]] NetMsg to App M.
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# App GS waits for App M to send a [[RemHostNameSETOK]] NetMsg.
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# App M sends a [[RemHostNameSETOK]] NetMsg.
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# App M is now connected to the Geometry Service network.
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# App M sends a [[NewSessionREQ]] NetMsg.
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# App GS creates a new Session.
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# App GS sends a [[NewSessionREQOK]] NetMsg.
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===Alt Sequence #1===
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:6a. App GS finds that the incoming Host is already on the HostList.  Either a duplicate name, or a duplicate connection. 
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:6b. App GS sends App M a [[RemHostNameSETFAIL]] NetMsg.
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:6c. App GS drops socket connection to App M.
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:6d. App M drops socket connection to App GS.
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==Application Request For Geometry==
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This sequence of NetMsg exchanges represents the communications between an external application (App M) as it requests Geometry from the Geometry Service (App GS).  This sequence assumes success and that both App M and App GS have completed the Application Interconnect Handshake.
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===Main Sequence===
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# App M sends a [[GeometryREQ]] NetMsg to App GS.
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# App GS finds the request Geometry. '''(Alt #1)'''
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# App GS sends App M a [[GeometryMANIFEST]] NetMsg.
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# App GS sends App M as many [[GeometryCHUNK]] NetMsgs as required in order to fulfill the [[GeometryMANIFEST]].
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===Alt Sequence #1===
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:2a. App GS does NOT find requested Geometry.
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:2b. App GS sends App M a [[GeometryREQFAIL]] NetMsg.
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Latest revision as of 14:25, 28 March 2011

This whole page needs to be redone with flow charts!

Initial handshake:

  • Server sends [GS Remote Nodename Set]
  • Client sends [GS Remote Nodename Set]
  • Client sends [NewSessionReqMsg] (login/passwd)
  • Server sends [SessionInfoMsg] (uuid of session)

Now ready to process