Examples of com.sun.sgs.kernel.TransactionScheduler

com.sun.sgs.kernel.TransactionScheduler
This interface is used to schedule transactional tasks for immediate, delayed, or periodic execution. Transactional tasks are short-lived: typically on the order of a few 10s of milliseconds) and not longer than the value of the property {@code com.sun.sgs.txn.timeout}. All tasks run through an implementation of {@code TransactionScheduler} will runtransactionally, and may be re-tried in the event of failure.
Many methods will make a best effort to schedule a given task to run, but based on the policy of the implementation, the task and its owner, may be unable to accept the given task. In this case {@code TaskRejectedException}is thrown. To ensure that a task will be accepted, methods are provided to get a {@code TaskReservation}. This is especially useful for {@code Service}methods working within a transaction that need to ensure that a task will be accepted before they can commit.
If the result of running a task via the {@code reserveTask} or{@code scheduleTask} methods is an {@code Exception} which implements{@code ExceptionRetryStatus}, then its {@code shouldRetry} method iscalled to decide if the task should be re-tried. It is up to the scheduler implementation's policy to decide how and when tasks are re-run, but all failing tasks run through a {@code TransactionScheduler} that wish to bere-tried will eventually be re-run given available resources.
Note that re-try is handled slightly differently for {@code runTask}. See the documentation on that method for more details.

  properties.setProperty(ACCESS_COORDINATOR_PROPERTY,
             MyAccessCoordinator.class.getName());
  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);

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        String.valueOf(detectMods));
  props.setProperty(DataStoreImplClass + ".flush.to.disk",
        String.valueOf(flush));
  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++) {
                                Counter counter = counters.get(i);

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  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);

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    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);

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    public void testMarkForUpdate() 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");
          DataManager dataManager =
        AppContext.getDataManager();

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  throws Exception
    {
  if (node == null) {
      node = serverNode;
  }
  TransactionScheduler nodeTxnScheduler =
      node.getSystemRegistry().getComponent(TransactionScheduler.class);
  Identity nodeTaskOwner =
      node.getProxy().getCurrentOwner();
  nodeTxnScheduler.runTask(task, nodeTaskOwner);
    }

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        public TestService(Properties properties, 
                    ComponentRegistry systemRegistry,
                    TransactionProxy txnProxy)
            throws Exception
        {
            TransactionScheduler transactionScheduler =
                systemRegistry.getComponent(TransactionScheduler.class);


            transactionScheduler.runTask(
    new AbstractKernelRunnable("UseStartupContext") {
        public void run() {
                        DataManager data = AppContext.getDataManager();
                        System.out.println("Data manager is " + data);
        } },  txnProxy.getCurrentOwner());

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        }
    }}, taskOwner);


      for (int i = 0; i < iterations; i++) {
    for (SgsTestNode node : nodes) {
        TransactionScheduler localTxnScheduler = 
      node.getSystemRegistry().
          getComponent(TransactionScheduler.class);
        Identity identity = node.getProxy().getCurrentOwner();
        localTxnScheduler.scheduleTask(
            new TestAbstractKernelRunnable() {
          public void run() {
        DataManager dataManager =
            AppContext.getDataManager();
        Counter counter;

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  SgsTestNode node, final DummyClient client, final int numMessages,
  final int offset)
  throws Exception
    {
  System.err.println("sending messages to client [" + client.name + "]");
        TransactionScheduler transactionScheduler = 
            node.getSystemRegistry(). getComponent(TransactionScheduler.class);
  for (int i = 0; i < numMessages; i++) {
      final int x = i + offset;
      transactionScheduler.runTask(new TestAbstractKernelRunnable() {
    public void run() {
        ClientSession session = (ClientSession)
      AppContext.getDataManager().getBinding(client.name);
      ByteBuffer buf = ByteBuffer.allocate(4);
      buf.putInt(x).flip();

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            server.getWatchdogService().reportFailure(node.getNodeId(), 
                    WatchdogService.class.getName());


            // The server node that reported the remote 
            // failure should be unaffected
            TransactionScheduler sched = server.getSystemRegistry().
                    getComponent(TransactionScheduler.class);
            Identity own = server.getProxy().getCurrentOwner();
            sched.runTask(new TestAbstractKernelRunnable() {
                public void run() throws Exception {
                    assertTrue(server.getWatchdogService().isLocalNodeAlive());
                }
            }, own);


            try {
                // The node should have failed
                sched = node.getSystemRegistry().
                        getComponent(TransactionScheduler.class);
                own = node.getProxy().getCurrentOwner();
                sched.runTask(new TestAbstractKernelRunnable() {
                    public void run() throws Exception {
                        if (node.getWatchdogService().isLocalNodeAlive()) {
                            fail("Expected watchdogService.isLocalNodeAlive() " +
                                    "to return false");
                        }

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Related Classes of com.sun.sgs.kernel.TransactionScheduler

com.sun.sgs.test.impl.kernel.TestKernelSetAccessCoordinator

com.sun.sgs.test.impl.kernel.TestKernelStartupContext$TestService

com.sun.sgs.test.impl.service.channel.AbstractChannelServiceTest

com.sun.sgs.test.impl.service.data.TestDataServicePerformance

com.sun.sgs.test.impl.service.session.TestClientSessionServiceImplv4

com.sun.sgs.test.impl.service.watchdog.TestWatchdogServiceImpl

com.sun.sgs.test.util.TestSgsTestNode

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