This sequence diagram shows the most important functions as being called between a UIPM, UCH, and TA, with regard to opening and closing a control session. Note that indentation reflects nesting of calls.

General remark:

• For simplicity, we assume that the UCH object itself is the UIPMListener and TAListener. In general, these might be separate objects.

Sequence of actions:

• A TA is loaded and registered with one or multiple targets. For details see diagram on Target Discovery above.
• A UIPM is loaded, initialized and receives notifications on discovered and discarded targets. For details see diagram on Target Discovery above.
• UCH calls TA: string getTargetName(string targetId)
• UCH calls TA: string[] getSocketNames(string targetName)
• UCH calls UIPM: void targetDiscovered(string targetId)
  • UIPM calls UCH: string getTargetName(string targetId)
  • UIPM calls UCH: string[] getSocketNames(string targetName)
  • UIPM calls UCH: string startUriService(IUIPM uipm, string scheme, int port, boolean portIsFlexible, string basePath, boolean basePathIsFlexible)
  • UIPM calls UCH: boolean addCompatibleUI(string targetId, string[] socketNames, string protocolShortName, string[] uris, Map protocolInfo)
• UCH receives a request from a controller with the UIPM's base URI.
• UCH calls UIPM: controllerRequest(Object request, Object response)
  • UIPM calls UCH: Map openSessionRequest(string targetId, string socketName, Map clientProps)
    • UCH calls TA: Map openSessionRequest(string targetId, string socketName, Map clientProps)
    • UCH calls TA: void sessionOpened(string targetId, string sessionIds, string socketName, Map clientProps)
• Note on UIPM: Any kind of activities on the session may occur. See diagram under Open Session Activities below.
• Note on UCH: UCH dispatches activities on the open session between UIPM and TA.
• Note on TA: TA maintains open session. See diagram under Open Session Activities below.
• UIPM calls UCH: long suspendSession(string sessionIds, long suggestedTimeout)
  • UCH calls TA: boolean suspendSessionRequest(string sessionIds)
  • UCH calls TA: long sessionSuspended(string sessionIds, long suggestedTimeout)
• Note on UIPM: No activities while the session is suspended.
• Note on UCH: No activities on suspended session.
• Note on TA: Session suspended during this time.
• UIPM calls UCH: boolean resumeSession(string sessionId)
  • UCH calls TA: boolean resumeSessionRequest(string sessionIds)
  • UCH calls TA: void sessionResumed(string sessionId)
• Note on TA: Session active again.
• Note on UCH: UCH dispatches activities between UIPM and TA.
• Note on UIPM: Any kind of activities on the active session.
• UIPM calls UCH: void closeSession(string sessionId)
  • UCH calls TA: void sessionClosed(string sessionId)
• UIPM calls UCH: void removeCompatibleUI(string[] uris]
• UIPM calls UCH: void stopUriService(string uri)
• At some point, no target is registered anymore with the TA, and it is unloaded. For details see diagram on Target Discovery above.
• At some point, the UIPM doesn't fit anymore for the available targets, and it is unloaded. For details see diagram on Target Discovery above.