This sequence diagram shows the most important functions as being called between a UIPM, UCH, TDM, and TA, when a new target is being discovered and, later, disappears again. Note that indentation reflects nesting of calls.

General remark:

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

Sequence of actions:

• A TDM is loaded (implementation-specific)
• UCH calls TDM: void init(ITDMListener tdmListener, Map tdmProps, Map uchProps)
• UCH calls TDM: void startDiscovery()
• TDM now constantly looking for new and disappearing targets.
• TDM calls UCH: string targetDiscovered(Map targetProps, Map taProps)
• TA is loaded for the target discovered. Note that the UCH may delay the instantiation of the TA until it gets an open session request from a UIPM for that target.
  • UCH calls TA: void init(ITAListener listener, Map taProps, Map uchProps)
    • TA calls UCH: boolean setValidation(ITA ta, boolean activate)
  • UCH calls TA: void registerTarget(string targetId, Map targetProps)
  • A UIPM gets loaded when it fits the set of available targets. See diagram on session management below for details.
  • UCH calls UIPM: void init(IUIPMListener uipmListener, Map uipmProps, Map uchProps)
  • UCH calls UIPM: void targetDiscovered(string targetId)
• TDM remembers the returned targetId.
• TA representing target. See Session Management diagram below.
• TDM calls UCH: void targetDiscarded(string targetId)
  • UCH calls UIPM: void targetDiscarded(string targetId)
    • UIPM calls UCH: void removeUIPM(IUIPM uipm)
      • UCH calls UIPM: void finalize()
  • UIPM is unloaded.
  • UCH calls TA: void unregisterTarget(string targetId)
    • TA calls UCH: void removeTA(ITA ta)
      • UCH calls TA: finalize()
  • TA is unloaded.
• UCH calls TDM: void stopDiscovery()
  • TDM calls UCH: void removeTDM(ITDM tdm)
    • UCH calls TDM: void finalize()
• TDM is unloaded.