Examples of edu.emory.mathcs.backport.java.util.concurrent.Callable

Package edu.emory.mathcs.backport.java.util.concurrent

Examples of edu.emory.mathcs.backport.java.util.concurrent.Callable

edu.emory.mathcs.backport.java.util.concurrent.Callable
A task that returns a result and may throw an exception. Implementors define a single method with no arguments called call.
The Callable interface is similar to {@link java.lang.Runnable}, in that both are designed for classes whose instances are potentially executed by another thread. A Runnable, however, does not return a result and cannot throw a checked exception.
The {@link Executors} class contains utility methods toconvert from other common forms to Callable classes. @see Executor @since 1.5 @author Doug Lea

            if( fullCheckpoint ) {                
                Iterator iterator = queues.values().iterator();
                while (iterator.hasNext()) {
                    try {
                        final JournalMessageStore ms = (JournalMessageStore) iterator.next();
                        FutureTask task = new FutureTask(new Callable() {
                            public Object call() throws Exception {
                                return ms.checkpoint();
                            }});
                        futureTasks.add(task);
                        checkpointExecutor.execute(task);                        
                    }
                    catch (Exception e) {
                        log.error("Failed to checkpoint a message store: " + e, e);
                    }
                }
            }


            Iterator iterator = topics.values().iterator();
            while (iterator.hasNext()) {
                try {
                    final JournalTopicMessageStore ms = (JournalTopicMessageStore) iterator.next();
                    FutureTask task = new FutureTask(new Callable() {
                        public Object call() throws Exception {
                            return ms.checkpoint();
                        }});
                    futureTasks.add(task);
                    checkpointExecutor.execute(task);

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            if( fullCheckpoint ) {                
                Iterator iterator = queues.values().iterator();
                while (iterator.hasNext()) {
                    try {
                        final RapidMessageStore ms = (RapidMessageStore) iterator.next();
                        FutureTask task = new FutureTask(new Callable() {
                            public Object call() throws Exception {
                                return ms.checkpoint();
                            }});
                        futureTasks.add(task);
                        checkpointExecutor.execute(task);                        
                    }
                    catch (Exception e) {
                        log.error("Failed to checkpoint a message store: " + e, e);
                    }
                }
            }


            Iterator iterator = topics.values().iterator();
            while (iterator.hasNext()) {
                try {
                    final RapidTopicMessageStore ms = (RapidTopicMessageStore) iterator.next();
                    FutureTask task = new FutureTask(new Callable() {
                        public Object call() throws Exception {
                            return ms.checkpoint();
                        }});
                    futureTasks.add(task);
                    checkpointExecutor.execute(task);

View Full Code Here

            if( fullCheckpoint ) {                
                Iterator iterator = queues.values().iterator();
                while (iterator.hasNext()) {
                    try {
                        final QuickJournalMessageStore ms = (QuickJournalMessageStore) iterator.next();
                        FutureTask task = new FutureTask(new Callable() {
                            public Object call() throws Exception {
                                return ms.checkpoint();
                            }});
                        futureTasks.add(task);
                        checkpointExecutor.execute(task);                        
                    }
                    catch (Exception e) {
                        log.error("Failed to checkpoint a message store: " + e, e);
                    }
                }
            }


            Iterator iterator = topics.values().iterator();
            while (iterator.hasNext()) {
                try {
                    final QuickJournalTopicMessageStore ms = (QuickJournalTopicMessageStore) iterator.next();
                    FutureTask task = new FutureTask(new Callable() {
                        public Object call() throws Exception {
                            return ms.checkpoint();
                        }});
                    futureTasks.add(task);
                    checkpointExecutor.execute(task);

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        final CountDownLatch sampleTimeDone = new CountDownLatch(1);


        final AtomicInteger producedMessages = new AtomicInteger(0);
        final AtomicInteger receivedMessages = new AtomicInteger(0);


        final Callable producer = new Callable() {
            public Object call() throws JMSException, InterruptedException {
                Connection connection = factory.createConnection();
                connections.add(connection);
                Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
                MessageProducer producer = session.createProducer(destination);
                producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);
                BytesMessage message = session.createBytesMessage();
                message.writeBytes(new byte[1024]);
                connection.start();
                connectionsEstablished.release();


                while (!sampleTimeDone.await(0, TimeUnit.MILLISECONDS)) {
                    producer.send(message);
                    producedMessages.incrementAndGet();
                }


                connection.close();
                workerDone.release();
                return null;
            }
        };


        final Callable consumer = new Callable() {
            public Object call() throws JMSException, InterruptedException {
                Connection connection = factory.createConnection();
                connections.add(connection);
                Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
                MessageConsumer consumer = session.createConsumer(destination);


                consumer.setMessageListener(new MessageListener() {
                    public void onMessage(Message msg) {
                        receivedMessages.incrementAndGet();
                    }
                });
                connection.start();


                connectionsEstablished.release();
                sampleTimeDone.await();


                connection.close();
                workerDone.release();
                return null;
            }
        };


        final Throwable workerError[] = new Throwable[1];
        for (int i = 0; i < PRODUCER_COUNT; i++) {
            new Thread("Producer:" + i) {
                public void run() {
                    try {
                        producer.call();
                    } catch (Throwable e) {
                        e.printStackTrace();
                        workerError[0] = e;
                    }
                }
            }.start();
        }


        for (int i = 0; i < CONSUMER_COUNT; i++) {
            new Thread("Consumer:" + i) {
                public void run() {
                    try {
                        consumer.call();
                    } catch (Throwable e) {
                        e.printStackTrace();
                        workerError[0] = e;
                    }
                }

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                overflowNotificationTime -= OVERFLOW_RENOTIFICATION_DELAY;
                
            } else {
                
                try {
                    final FutureTask result = new FutureTask(new Callable() {
                        public Object call() throws Exception {
                            return queuedActivateNextLogFile();
                        }});
                    executor.execute(result);
                    Location location = (Location) result.get();

View Full Code Here

            }
        }


        // Run this in the queued executor thread.
        try {
            final FutureTask result = new FutureTask(new Callable() {
                public Object call() throws Exception {
                    return queuedGetNextRecordLocation((Location) lastLocation);
                }});
            executor.execute(result);
            return (Location) result.get();

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     */
    public Packet read(final RecordLocation l) throws IOException, InvalidRecordLocationException {
        final Location location = (Location) l;
        // Run this in the queued executor thread.
        try {
            final FutureTask result = new FutureTask(new Callable() {
                public Object call() throws Exception {
                    return file.readPacket(location);
                }});
            executor.execute(result);
            return (Packet) result.get();

View Full Code Here

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Related Classes of edu.emory.mathcs.backport.java.util.concurrent.Callable

org.apache.activeio.journal.active.JournalImpl

org.apache.activemq.JmsBenchmark

org.apache.activemq.store.journal.JournalPersistenceAdapter

org.apache.activemq.store.journal.QuickJournalPersistenceAdapter

org.apache.activemq.store.rapid.RapidPersistenceAdapter

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