Examples of org.xmlBlaster.util.queue.I_Queue

org.xmlBlaster.util.queue.I_Queue
The Interface which all queues (persistent queues and cache queues) must implement. Note on shared store (or single point of persistence). In most cases the storage of the raw data for the queues is done centrally, for example in a database or on a file system or on the Ram. We call this space which is shared by all queues a 'shared store' or in case of persistent queues 'single point of persistence'. On this space each queue is represented by a 'persistent queue entity' (which in case of a DB could be a Table). In such a design it is theoretically possible to have two queues (two java objects on the same- or on different JVM) which point to the same persistent queue entity. It should be avoided to have that happen simultaneously since wether the persistent queue entity, nor the two objects have knowledge of each other. This could lead to unexpected and undesired results in case the queues store part of the information on cache.
As an example for sorting see org.xmlBlaster.util.queuemsg.MsgQueueEntry#compare(I_QueueEntry)

All methods are reentrant and thread safe
@author michele@laghi.eu @author xmlBlaster@marcelruff.info


   /**
    * Put the given message entry into the queue
    */
   public final void queueMessage(MsgQueueEntry entry) throws XmlBlasterException {
      I_Queue sessionQueue = this.sessionQueue;
      if (!hasCallback() || sessionQueue == null) {
         if (log.isLoggable(Level.FINE)) log.fine(ME+": Queing PtP message without having configured a callback to the client, the client needs to reconnect with a valid callback address later");
         //if (!connectQos.getSessionName().isPubSessionIdUser()) { // client has specified its own publicSessionId (> 0)
         //   throw new XmlBlasterException(glob, ErrorCode.USER_CONFIGURATION, ME, "No callback server is configured, can't callback client to send message " + entry.getKeyOid());
         //}
      }
      if (getPublicSessionId() < 0 && entry.isPersistent()) {
         entry.setPersistent(false);
         if (!this.transientWarn) {
            log.warning(ME+": Handling persistent messages in callback queue as transient as we have a login session with a negative public session id (we can't reconnect to same queue after restart)");
            this.transientWarn = true;
         }
      }
      sessionQueue.put(entry, I_Queue.USE_PUT_INTERCEPTOR);


      I_Checkpoint cp = glob.getCheckpointPlugin();
      if (cp != null) {
         cp.passingBy(I_Checkpoint.CP_UPDATE_QUEUE_ADD, entry.getMsgUnit(),
                  this.getSessionName(), null);

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      if (newConnectQos.getData().getClientProperty(Constants.CLIENTPROPERTY_REMOTEPROPERTIES, false)) {
          mergeRemoteProperties(newConnectQos.getData().getClientProperties());
      }


      CbQueueProperty cbQueueProperty = newConnectQos.getSessionCbQueueProperty();
      I_Queue sessionQueue = this.sessionQueue;
      if (sessionQueue != null) sessionQueue.setProperties(cbQueueProperty);
      if (wantsCallbacks && hasCallback()) {
         DispatchManager dispatchManager = this.dispatchManager;
         if (dispatchManager != null) {
            dispatchManager.updateProperty(cbQueueProperty.getCallbackAddresses());
            log.info(ME+": Successfully reconfigured callback address with new settings, other reconfigurations are not yet implemented");

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   public void changed(I_Storage storage, long numEntries, long numBytes, boolean isShutdown) {
      if (isShutdown) return;
      SubjectInfo subjectInfo = getSubjectInfo();
      boolean hasSubjectEntries = (subjectInfo == null) ? false : subjectInfo.getSubjectQueue().getNumOfEntries() > 0;
      if (lastNumEntries != numEntries) {
         I_Queue sessionQueue = this.sessionQueue;
         long max = (sessionQueue == null) ? 0 : sessionQueue.getMaxNumOfEntries();
         if (hasSubjectEntries && numEntries < max && lastNumEntries > numEntries) {
            if (log.isLoggable(Level.FINE)) log.fine(ME+": SessionQueue has emptied from " + lastNumEntries +
                           " to " + numEntries + " entries, calling SubjectInfoShuffler.shuffle()");
            this.glob.getSubjectInfoShuffler().shuffle(subjectInfo);
         }

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      }
      else {
         sb.append(offset).append(Constants.INDENT).append("<DispatchManager id='NULL'/>");
      }


      I_Queue sessionQueue = this.sessionQueue;
      if (sessionQueue != null) {
         sb.append(sessionQueue.toXml(extraOffset+Constants.INDENT));
      }
      sb.append(offset).append("</SessionInfo>");


      return sb.toString();
   }

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      if (this.sessionQueue == null) return 0L;
      return this.sessionQueue.getNumOfBytes();
   }


   public final long getCbQueueBytesCache() {
      I_Queue sq = this.sessionQueue;
      if (sq == null) return 0L;
      if (sq instanceof CacheQueueInterceptorPlugin) {
         CacheQueueInterceptorPlugin cq = (CacheQueueInterceptorPlugin)sq;
         I_Queue tq = cq.getTransientQueue();
         if (tq != null) return tq.getNumOfBytes();
         return 0L;
      }
      return -1L;
   }

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      }
      return -1L;
   }


   public final long getCbQueueNumMsgsCache() {
      I_Queue sq = this.sessionQueue;
      if (sq == null) return 0L;
      if (sq instanceof CacheQueueInterceptorPlugin) {
         CacheQueueInterceptorPlugin cq = (CacheQueueInterceptorPlugin)sq;
         I_Queue tq = cq.getTransientQueue();
         if (tq != null) return tq.getNumOfEntries();
         return 0L;
      }
      return -1L;
   }

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      if (this.sessionQueue == null) return 0L;
      return this.sessionQueue.getMaxNumOfEntries();
   }


   public final long getCbQueueMaxMsgsCache() {
      I_Queue sq = this.sessionQueue;
      if (sq == null) return 0L;
      if (sq instanceof CacheQueueInterceptorPlugin) {
          CacheQueueInterceptorPlugin cq = (CacheQueueInterceptorPlugin)sq;
          I_Queue tq = cq.getTransientQueue();
          if (tq != null) return tq.getMaxNumOfEntries();
          return 0L;
      }
      return -1L;
   }

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         throw new Exception(e.toString());
      }
   }


   public long clearCallbackQueue() {
      I_Queue sessionQueue = this.sessionQueue;
      return (sessionQueue==null) ? 0L : sessionQueue.clear();
   }

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      I_Queue sessionQueue = this.sessionQueue;
      return (sessionQueue==null) ? 0L : sessionQueue.clear();
   }


   public long removeFromCallbackQueue(long numOfEntries) throws XmlBlasterException {
      I_Queue sessionQueue = this.sessionQueue;
      return (sessionQueue==null) ? 0L : sessionQueue.removeNum(numOfEntries);
   }

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