Example #1
0
  void applyApplicationStateLocally(
      InetAddress addr, EndpointState localStatePtr, EndpointState remoteStatePtr) {
    Map<ApplicationState, VersionedValue> localAppStateMap = localStatePtr.getApplicationStateMap();

    for (Entry<ApplicationState, VersionedValue> remoteEntry :
        remoteStatePtr.getApplicationStateMap().entrySet()) {
      ApplicationState remoteKey = remoteEntry.getKey();
      VersionedValue remoteValue = remoteEntry.getValue();
      VersionedValue localValue = localAppStateMap.get(remoteKey);

      /* If state doesn't exist locally for this key then just apply it */
      if (localValue == null) {
        localStatePtr.addApplicationState(remoteKey, remoteValue);
        doNotifications(addr, remoteKey, remoteValue);
        continue;
      }

      int remoteGeneration = remoteStatePtr.getHeartBeatState().getGeneration();
      int localGeneration = localStatePtr.getHeartBeatState().getGeneration();
      assert remoteGeneration
          >= localGeneration; // SystemTable makes sure we never generate a smaller generation on
                              // start

      /* If the remoteGeneration is greater than localGeneration then apply state blindly */
      if (remoteGeneration > localGeneration) {
        localStatePtr.addApplicationState(remoteKey, remoteValue);
        doNotifications(addr, remoteKey, remoteValue);
        continue;
      }

      /* If the generations are the same then apply state if the remote version is greater than local version. */
      if (remoteGeneration == localGeneration) {
        int remoteVersion = remoteValue.version;
        int localVersion = localValue.version;

        if (remoteVersion > localVersion) {
          localStatePtr.addApplicationState(remoteKey, remoteValue);
          doNotifications(addr, remoteKey, remoteValue);
        }
      }
    }
  }
Example #2
0
  EndpointState getStateForVersionBiggerThan(InetAddress forEndpoint, int version) {
    EndpointState epState = endpointStateMap_.get(forEndpoint);
    EndpointState reqdEndpointState = null;

    if (epState != null) {
      /*
       * Here we try to include the Heart Beat state only if it is
       * greater than the version passed in. It might happen that
       * the heart beat version maybe lesser than the version passed
       * in and some application state has a version that is greater
       * than the version passed in. In this case we also send the old
       * heart beat and throw it away on the receiver if it is redundant.
       */
      int localHbVersion = epState.getHeartBeatState().getHeartBeatVersion();
      if (localHbVersion > version) {
        reqdEndpointState = new EndpointState(epState.getHeartBeatState());
        if (logger_.isTraceEnabled())
          logger_.trace(
              "local heartbeat version "
                  + localHbVersion
                  + " greater than "
                  + version
                  + " for "
                  + forEndpoint);
      }
      /* Accumulate all application states whose versions are greater than "version" variable */
      for (Entry<ApplicationState, VersionedValue> entry :
          epState.getApplicationStateMap().entrySet()) {
        VersionedValue value = entry.getValue();
        if (value.version > version) {
          if (reqdEndpointState == null) {
            reqdEndpointState = new EndpointState(epState.getHeartBeatState());
          }
          final ApplicationState key = entry.getKey();
          if (logger_.isTraceEnabled()) logger_.trace("Adding state " + key + ": " + value.value);
          reqdEndpointState.addApplicationState(key, value);
        }
      }
    }
    return reqdEndpointState;
  }
Example #3
0
 public void addLocalApplicationState(ApplicationState state, VersionedValue value) {
   EndpointState epState = endpointStateMap_.get(localEndpoint_);
   assert epState != null;
   epState.addApplicationState(state, value);
 }