Class ReliableIndicationHandler

java.lang.Object
org.sblim.cimclient.internal.wbem.indications.ReliableIndicationHandler

public class ReliableIndicationHandler extends Object
ReliableIndicationHandler is responsible for determining when to dispatch reliable indications, which includes queuing unexpected indications, caching all indications for the duration of their sequence identifier lifetime, and logging missing, duplicate and out-of-order indications. This functionality is based on the changes first introduced by DSP1054 v1.1. The handleIndication, areAllEmpty and processAll methods need to be synchronized because they are the entry points into ReliableIndicationHandler - the first is the public entry point that needs to be passed each and every reliable indication, the other two are only called by the DataManager thread and hence protected. All of the private methods are only called from one of the three synchronized methods. NOTE: ReliableIndicationHandler does NOT contain any logic for handling sequence number wrapping. It was deemed unnecessary because of the performance impact to each and every indication for a VERY rare occurrence: sequence numbers are longs (signed 64-bit integers) that are are supposed to start at 0, so even if the listener handled 1,000,00 indications per second, it would take over 292,471 years for the sequence number to wrap.
  • Constructor Details

    • ReliableIndicationHandler

      public ReliableIndicationHandler(CIMEventDispatcher pDispatcher, long pIdentiferLifetime)
      Constructs a ReliableIndicationHandler instance that uses the specified event dispatcher and sequence identifier lifetime to handle reliable indications.
      Parameters:
      pDispatcher - CIMEventDispatcher that does the actual indication dispatching.
      pIdentiferLifetime - Sequence identifier lifetime.
  • Method Details

    • areAllEmpty

      protected boolean areAllEmpty()
      Determines if both the indication delivery queue and sequence identifier cache are empty.
      Returns:
      true if both the indication delivery queue and sequence identifier cache are empty, false otherwise.
    • processAll

      protected void processAll()
      Processes both the indication delivery queue and sequence identifier cache.
    • handleIndication

      public void handleIndication(CIMInstance pIndication, String pId, InetAddress pInetAddress)
      Main worker routine for ReliableIndicationHandler. The indication is either sent directly to the CIMEventDispatcher or placed in the indication delivery queue to be dispatched later. All reliable indications are placed in the sequence identifier cache.
      Parameters:
      pIndication - Indication.
      pId - Indication destination URL.
      pInetAddress - Indication server IP.