Examples of com.sun.sgs.service.DataService

com.sun.sgs.service.DataService
Provides facilities for services to manage access to shared, persistent objects. In addition to the methods provided by {@link DataManager}, this interface includes methods for an additional set of service bindings. These service bindings are intended to by used by services to support their needs to store objects persistently. The objects associated with service bindings are independent of the objects bound through methods defined on DataManager. Services should insure that they use unique names for service bindings by using their class or package name as the prefix for the name.


  /**
   * Constructs an event queue for the specified {@code sessionImpl}.
   */
  EventQueue(ClientSessionImpl sessionImpl) {
      DataService dataService =
    sessionImpl.sessionService.getDataService();
      sessionRef = dataService.createReference(sessionImpl);
      queueRef = dataService.createReference(
    new ManagedQueue<SessionEvent>());
      writeBufferAvailable = sessionImpl.writeBufferCapacity;
  }

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    }
    return;
      }


      ManagedQueue<SessionEvent> eventQueue = getQueue();
      DataService dataService =
    ClientSessionServiceImpl.getInstance().getDataService();
      
      for (int i = 0; i < sessionService.eventsPerTxn; i++) {
    SessionEvent event = eventQueue.poll();
    if (event == null) {
        // no more events
        // TBD: should the session's task queue for servicing
        // events be cleared?
        return;
    }


    logger.log(Level.FINEST, "processing event:{0}", event);


                int cost = event.getCost();
    if (cost > 0) {
        // TBD: this update is costly.
        dataService.markForUpdate(this);
        writeBufferAvailable += cost;
        if (logger.isLoggable(Level.FINEST)) {
            logger.log(Level.FINEST,
           "{0} cleared reservation of " +
           "{1,number,#} bytes, leaving {2,number,#}",

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  /* -- Implement ManagedObjectRemoval -- */


  /** {@inheritDoc} */
  public void removingObject() {
      try {
    DataService dataService =
        ClientSessionServiceImpl.getInstance().getDataService();
    dataService.removeObject(queueRef.get());
      } catch (ObjectNotFoundException e) {
    // already removed.
      }
  }

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      lastKey = nodePrefix;
  }


  /** {@inheritDoc} */
  public void run() {
      DataService dataService =
    ClientSessionServiceImpl.getInstance().getDataService();
      // TBD: this could use a BindingKeyedMap.
      String key = dataService.nextServiceBoundName(lastKey);
      if (key != null && key.startsWith(nodePrefix)) {
    TaskService taskService =
        ClientSessionServiceImpl.getTaskService();
    taskService.scheduleTask(
        new CleanupDisconnectedSessionTask(key));

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      this.key = key;
  }


  /** {@inheritDoc} */
  public void run() {
      DataService dataService =
    ClientSessionServiceImpl.getInstance().getDataService();
      ClientSessionImpl sessionImpl =
    (ClientSessionImpl) dataService.getServiceBinding(key);
      sessionImpl.notifyListenerAndRemoveSession(
    dataService, false, true);
  }

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      if (savedMessages.isEmpty()) {
    // Saved messages no longer exist, so "cancel" periodic task.
    return;
      } else {
    // Remove messages saved past their expiration time.
    DataService dataService = getDataService();
    TaskManager taskManager = AppContext.getTaskManager();
    Iterator<ChannelMessageInfo> iter =
        savedMessages.values().iterator();
    while (taskManager.shouldContinue() && iter.hasNext()) {
        ChannelMessageInfo messageInfo = iter.next();
        if (messageInfo.isExpired()) {
      if (logger.isLoggable(Level.FINEST)) {
          logger.log(
        Level.FINEST,
        "Removing saved message, channel:{0} " +
        "timestamp:{1}", channelRefId,
        messageInfo.timestamp);
      }
      iter.remove();
      dataService.removeObject(messageInfo);
        } else {
      break;
        }
    }
    if (!savedMessages.isEmpty()) {

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  SgsTestNode node = new SgsTestNode(
      "TestKernelSetAccessCoordinator", null, properties);
        Identity taskOwner = node.getProxy().getCurrentOwner();
        TransactionScheduler txnScheduler =
      node.getSystemRegistry().getComponent(TransactionScheduler.class);
  final DataService dataService = node.getDataService();
  txnScheduler.runTask(
      new TestAbstractKernelRunnable() {
    public void run() throws Exception {
        dataService.setBinding("a", new DummyManagedObject());
    }
      }, taskOwner);
  assertTrue(MyAccessCoordinator.getUsed());
  node.shutdown(false);
    }

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  /**
   * Constructs an event queue for the specified {@code channel}.
   */
  EventQueue(ChannelImpl channel) {
      DataService dataService = getDataService();
      channelRef = dataService.createReference(channel);
      queueRef = dataService.createReference(
    new ManagedQueue<ChannelEvent>());
      writeBufferAvailable = channel.getWriteBufferCapacity();
  }

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  Properties props = getNodeProps();
  props.setProperty(DataServiceImplClass + ".detect.modifications",
        String.valueOf(detectMods));
  props.setProperty("com.sun.sgs.txn.timeout", "10000");
  serverNode = new SgsTestNode("TestDataServicePerformance", null, props);
  final DataService service = serverNode.getDataService();
        TransactionScheduler txnScheduler = serverNode.getSystemRegistry().
            getComponent(TransactionScheduler.class);
        Identity taskOwner = serverNode.getProxy().getCurrentOwner();
        txnScheduler.runTask(new TestAbstractKernelRunnable() {
                public void run() {
                    service.setBinding("counters", new Counters(items));
                }}, taskOwner);
        for (int r = 0; r < repeat; r++) {
            long start = System.currentTimeMillis();
            for (int c = 0; c < count; c++) {
                txnScheduler.runTask(new TestAbstractKernelRunnable() {
                        public void run() throws Exception {
                            Counters counters =
                                (Counters) service.getBinding("counters");
                            for (int i = 0; i < items; i++) {
                                counters.get(i);
                            }
                        }}, taskOwner);
            }

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    @Test
    public void testReadForUpdate() throws Exception {
  Properties props = getNodeProps();
  props.setProperty("com.sun.sgs.txn.timeout", "10000");
  serverNode = new SgsTestNode("TestDataServicePerformance", null, props);
  final DataService service = serverNode.getDataService();
        TransactionScheduler txnScheduler = serverNode.getSystemRegistry().
            getComponent(TransactionScheduler.class);
        Identity taskOwner = serverNode.getProxy().getCurrentOwner();
        txnScheduler.runTask(new TestAbstractKernelRunnable() {
                public void run() {
                    service.setBinding("counters", new Counters(items));
                }}, taskOwner);
        for (int r = 0; r < repeat; r++) {
            long start = System.currentTimeMillis();
            for (int c = 0; c < count; c++) {
                txnScheduler.runTask(new TestAbstractKernelRunnable() {
                        public void run() throws Exception {
                            Counters counters =
                                (Counters) service.getBinding("counters");
                            for (int i = 0; i < items; i++) {
                                counters.getForUpdate(i);
                            }
                        }}, taskOwner);
            }

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