Examples of org.xmlBlaster.util.queue.ReturnDataHolder

org.xmlBlaster.util.queue.ReturnDataHolder
DataHolder Object to hold the return data of methods used in the different implementations of the I_Queue and their helper classes. @author Marcel Ruff @author Michele Laghi

   private final ReturnDataHolder processResultSetForDeleting(ResultSet rs, int numOfEntries, long numOfBytes,
         List<Long> retL)
      throws SQLException, XmlBlasterException {


      if (log.isLoggable(Level.FINER)) log.finer("processResultSetForDeleting invoked");
      ReturnDataHolder ret = new ReturnDataHolder();
      long currentAmount = 0L;
      while ( (rs.next()) && ((ret.countEntries < numOfEntries) || (numOfEntries < 0)) &&
         ((ret.countBytes < numOfBytes) || (numOfBytes < 0))) {
         currentAmount = rs.getLong(2);
         if ( (numOfBytes < 0) || (ret.countBytes+currentAmount < numOfBytes) || (ret.countEntries == 0)) {

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   public ReturnDataHolder getAndDeleteLowest(StorageId storageId, int numOfEntries, long numOfBytes,
      int maxPriority, long minUniqueId, boolean leaveOne, boolean doDelete) throws XmlBlasterException {


      String queueName = storageId.getStrippedId();
      if (log.isLoggable(Level.FINER)) log.finer("Entering");
      ReturnDataHolder ret = new ReturnDataHolder();


      if (!this.isConnected) {
         if (log.isLoggable(Level.FINE))
            log.fine("Currently not possible. No connection to the DB");
         return ret;

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    */
   public ReturnDataHolder deleteFirstEntries(String queueName, long numOfEntries, long amount)
      throws XmlBlasterException {
      if (log.isLoggable(Level.FINER)) log.finer("Entering");


      ReturnDataHolder ret = new ReturnDataHolder();
      if (!this.isConnected) {
         if (log.isLoggable(Level.FINE))
            log.fine("Currently not possible. No connection to the DB");
         return ret;
      }

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      if (limitEntry != null) {
         minUniqueId = limitEntry.getUniqueId();
         maxPriority = limitEntry.getPriority();
      }


      ReturnDataHolder ret = null;
      synchronized(this.modificationMonitor) {
         try {
            ret = this.manager.getAndDeleteLowest(getStorageId(), numOfEntries, numOfBytes, maxPriority, minUniqueId, leaveOne, true);
            this.numOfBytes -= ret.countBytes;
            this.numOfEntries -= ret.countEntries;

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      if (limitEntry != null) {
         minUniqueId = limitEntry.getUniqueId();
         maxPriority = limitEntry.getPriority();
      }


      ReturnDataHolder ret = this.manager.getAndDeleteLowest(getStorageId(), numOfEntries, numOfBytes, maxPriority, minUniqueId, leaveOne, false);
      return ret.list;
   }

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    * This method does not block.
    * @return Number of messages erased (0 or 1)
    * @throws XmlBlasterException if the underlying implementation gets an exception.
    */
   public int remove() throws XmlBlasterException {
      ReturnDataHolder ret = null;
      synchronized(this.modificationMonitor) {
         try {
            ret = this.manager.deleteFirstEntries(getStorageId().getStrippedId(), 1, -1L);
            this.numOfEntries -= (int)ret.countEntries;
            this.numOfBytes -= ret.countBytes;

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    * @return Number of entries erased
    * @throws XmlBlasterException if the underlying implementation gets an exception.
    */
   public long removeNum(long numOfEntries) throws XmlBlasterException {
      if (numOfEntries == 0) return 0L;
      ReturnDataHolder ret = null;
      synchronized(this.modificationMonitor) {
         try {
            ret = this.manager.deleteFirstEntries(getStorageId().getStrippedId(), numOfEntries, numOfBytes);
            this.numOfEntries -= (int)ret.countEntries;
            this.numOfBytes -= ret.countBytes;

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   /**
    * Clears everything and removes the queue (i.e. frees the associated table)
    */
   public long clear() {
      try {
         ReturnDataHolder ret = this.manager.deleteFirstEntries(getStorageId().getStrippedId(), -1, -1L);
         this.numOfEntries = 0L;
         this.numOfBytes = 0L;
         this.numOfPersistentEntries = 0L;
         this.numOfPersistentBytes = 0L;
         this.storageSizeListenerHelper.invokeStorageSizeListener();

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      if (limitEntry != null) {
         minUniqueId = limitEntry.getUniqueId();
         maxPriority = limitEntry.getPriority();
      }


      ReturnDataHolder ret = null;
      synchronized(this.modificationMonitor) {
         try {
            ret = databaseAccessor.getAndDeleteLowest(xbStore, numEntries, numBytes, maxPriority, minUniqueId, leaveOne, true, this);
            numOfBytes -= ret.countBytes;
            numOfEntries -= ret.countEntries;

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      if (limitEntry != null) {
         minUniqueId = limitEntry.getUniqueId();
         maxPriority = limitEntry.getPriority();
      }


      ReturnDataHolder ret = databaseAccessor.getAndDeleteLowest(xbStore, numEntries, numBytes, maxPriority, minUniqueId, leaveOne, false, this);
      return ret.list;
   }

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