Example usage for java.util.concurrent Executors newSingleThreadExecutor

List of usage examples for java.util.concurrent Executors newSingleThreadExecutor

  1. HOME
  2. Java
  3. java
  4. java.util.concurrent.*
  5. Executors
  6. newSingleThreadExecutor

Introduction

In this page you can find the example usage for java.util.concurrent Executors newSingleThreadExecutor.

Prototype

public static ExecutorService newSingleThreadExecutor()

Source Link

Document

Creates an Executor that uses a single worker thread operating off an unbounded queue.

Usage

From source file:edu.lternet.pasta.dml.util.DocumentDownloadUtil.java

public InputStream downloadDocument(final String id, final EcogridEndPointInterface endpoint) throws Exception {

    init();//from w w w  .  j ava 2  s .  co m

    log.debug("starting the download");

    ExecutorService service = Executors.newSingleThreadExecutor();
    service.execute(new Runnable() {
        public void run() {
            long startTime = System.currentTimeMillis();

            try {
                if (endpoint instanceof AuthenticatedEcogridEndPointInterface) {
                    AuthenticatedQueryServiceGetToStreamClient authenticatedEcogridClient = new AuthenticatedQueryServiceGetToStreamClient(
                            new URL(((AuthenticatedEcogridEndPointInterface) endpoint)
                                    .getMetacatAuthenticatedEcogridEndPoint()));
                    authenticatedEcogridClient.get(id,
                            ((AuthenticatedEcogridEndPointInterface) endpoint).getSessionId(), outputStream);
                } else {
                    QueryServiceGetToStreamClient ecogridClient = new QueryServiceGetToStreamClient(
                            new URL(endpoint.getMetacatEcogridEndPoint()));
                    ecogridClient.get(id, outputStream);
                }
                outputStream.close();

                long endTime = System.currentTimeMillis();
                log.debug((endTime - startTime) + " ms to download document data");

                log.debug("Done downloading id=" + id);

            } catch (Exception e) {
                log.error("Error getting document from ecogrid: " + e.getMessage());
                e.printStackTrace();
            }

        }
    });

    //wait for the download to complete
    service.shutdown();
    service.awaitTermination(0, TimeUnit.SECONDS);

    log.debug("done with the download");

    return inputStream;

}

From source file:com.github.brandtg.switchboard.FileLogAggregator.java

/**
 * An agent that aggregates logs from multiple sources and multiplexes them.
 *
 * @param sources//from  ww  w .  j  a v a 2s.  c o m
 *  A set of source switchboard servers from which to pull logs
 * @param separator
 *  The line delimiter (after this is reached, lines will be output to outputStream)
 * @param outputStream
 *  OutputStream to which all multiplexed logs are piped
 */
public FileLogAggregator(Set<InetSocketAddress> sources, char separator, OutputStream outputStream)
        throws IOException {
    this.separator = separator;
    this.outputStream = outputStream;
    this.isShutdown = new AtomicBoolean(true);
    this.eventExecutors = new NioEventLoopGroup();
    this.logReceivers = new HashMap<>();
    this.inputStreams = new HashMap<>();
    this.listener = new Object();
    this.muxExecutor = Executors.newSingleThreadExecutor();
    this.stringBuffers = new HashMap<>();

    for (InetSocketAddress source : sources) {
        PipedOutputStream pos = new PipedOutputStream();
        PipedInputStream pis = new PipedInputStream(pos);
        LogReceiver logReceiver = new LogReceiver(new InetSocketAddress(0), eventExecutors, pos);
        logReceiver.registerListener(listener);
        logReceivers.put(source, logReceiver);
        inputStreams.put(source, pis);
        stringBuffers.put(source, new StringBuffer());
    }
}

From source file:edu.lternet.pasta.dml.download.DocumentHandler.java

public InputStream downloadDocument() throws Exception {

    log.info("starting the download");

    boolean success = true;

    final String id = docId;
    final EcogridEndPointInterface endpoint = ecogridEndPointInterface;

    ExecutorService service = Executors.newSingleThreadExecutor();
    service.execute(new Runnable() {
        public void run() {
            long startTime = System.currentTimeMillis();

            //get from the ecogrid
            try {
                if (ecogridEndPointInterface instanceof AuthenticatedEcogridEndPointInterface) {
                    AuthenticatedQueryServiceGetToStreamClient authenticatedEcogridClient = new AuthenticatedQueryServiceGetToStreamClient(
                            new URL(((AuthenticatedEcogridEndPointInterface) endpoint)
                                    .getMetacatAuthenticatedEcogridEndPoint()));
                    authenticatedEcogridClient.get(id,
                            ((AuthenticatedEcogridEndPointInterface) endpoint).getSessionId(), outputStream);
                } else {
                    QueryServiceGetToStreamClient ecogridClient = new QueryServiceGetToStreamClient(
                            new URL(endpoint.getMetacatEcogridEndPoint()));
                    ecogridClient.get(id, outputStream);
                }/*  w  w w. j  a v  a2s. co  m*/
                outputStream.close();
                long endTime = System.currentTimeMillis();
                log.debug((endTime - startTime) + " ms to download: " + docId);
                log.debug("Done downloading id=" + id);

            } catch (Exception e) {
                log.error("Error getting document from ecogrid: " + e.getMessage());
                e.printStackTrace();
            }

        }
    });

    //wait for the download to complete
    service.shutdown();
    service.awaitTermination(0, TimeUnit.SECONDS);

    return inputStream;
}

From source file:org.sample.asyncserver.MyResource.java

@GET
public void getList(@Suspended final AsyncResponse ar) {
    ar.setTimeoutHandler(new TimeoutHandler() {

        @Override//from   w w w.jav a 2  s .  c o  m
        public void handleTimeout(AsyncResponse ar) {
            ar.resume("Operation timed out");
        }
    });
    ar.setTimeout(4000, TimeUnit.MILLISECONDS);

    ar.register(new MyCompletionCallback());
    ar.register(new MyConnectionCallback());

    Executors.newSingleThreadExecutor().submit(new Runnable() {

        @Override
        public void run() {
            try {
                Thread.sleep(3000);
                ar.resume(response[0]);
            } catch (InterruptedException ex) {

            }
        }

    });
}

From source file:com.meltmedia.cadmium.core.worker.CoordinatedWorkerImpl.java

public CoordinatedWorkerImpl() {
    pool = Executors.newSingleThreadExecutor();
    listener = this;
}

From source file:org.apache.streams.datasift.example.StreamsApiApplication.java

@Override
public void run(StreamsApiConfiguration configuration, Environment environment) throws Exception {

    this.configuration = configuration;

    provider = new DatasiftWebhookResource();

    executor = Executors.newSingleThreadExecutor();

    executor.execute(new StreamsLocalRunner());

    Thread.sleep(10000);//from ww  w .j a  va2s  .  c  o m

    environment.jersey().register(provider);

}

From source file:pzalejko.iot.hardware.home.core.app.Application.java

/**
 * Starts all services.//ww  w . j  av a  2  s  .  c  o  m
 * <p>
 * NOTE: When this method is done then the application can be closed.
 *
 * @throws ExecutionException if a task cannot be started.
 * @throws InterruptedException if a task has been interrupted.
 */
public void start() throws ExecutionException, InterruptedException {
    LOG.debug(LogMessages.STARTING_APPLICATION);

    taskExecutor.executeRepeatable(temperatureTask, temperatureTask.getReadFrequency());
    taskExecutor.execute(remoteLedControlTask);
    taskExecutor.execute(ledAlertTask);

    final ExecutorService executor = Executors.newSingleThreadExecutor();
    executor.submit(shutDownTask).get();
}

From source file:de.dfki.iui.mmds.scxml.engine.SCXMLEngineActivator.java

public static void sendScxmlOnExitEvent(final String id, final TransitionTarget state) {
    if (getEventAdmin() == null)
        return;/*from   w w  w .j  av  a 2s.  c  o  m*/
    Executors.newSingleThreadExecutor().execute(new Runnable() {
        @Override
        public void run() {
            getEventAdmin().sendEvent(new SCXMLOnExitEvent(id, state));
        }
    });
}

From source file:biz.fstechnology.micro.server.jms.AbstractJmsService.java

/**
 * @see javax.jms.MessageListener#onMessage(javax.jms.Message)
 *///from   w  w w  .  j ava 2  s  .com
@Override
public void onMessage(Message message) {
    try {
        ExecutorService executor = Executors.newSingleThreadExecutor();

        if (((ObjectMessage) message).getObject() instanceof Result) {
            // no op
            return;
        }
        Request<?> request = (Request<?>) ((ObjectMessage) message).getObject(); // cast hell...
        Future<Request<?>> preProcessFuture = executor.submit(() -> onPreProcessRequest(request));

        Future<Result<?>> resultFuture = executor.submit(() -> processRequest(preProcessFuture.get()));

        Future<Result<?>> postProcessFuture = executor
                .submit(() -> onPostProcessRequest(request, resultFuture.get()));
        executor.shutdown();

        Result<?> result = postProcessFuture.get();

        ResponseMessageCreator messageCreator = new ResponseMessageCreator();
        messageCreator.setContents(result);
        messageCreator.setRequestId(message.getJMSCorrelationID());

        replyProducer.send(message.getJMSReplyTo(), messageCreator.createMessage(session));

    } catch (JMSException | InterruptedException | ExecutionException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        Result<Object> result = new Result<>(e);
        try {
            ResponseMessageCreator messageCreator = new ResponseMessageCreator();
            messageCreator.setContents(result);
            messageCreator.setRequestId(message.getJMSCorrelationID());

            replyProducer.send(message.getJMSReplyTo(), messageCreator.createMessage(session));
        } catch (JmsException | JMSException e1) {
            e1.printStackTrace();
        }
    }
}

From source file:com.google.code.guice.repository.testing.junit.general.UserRepositoryTest.java

@Test
public void testRepo() throws Exception {
    userRepository.deleteAll();//w ww. j  a v  a  2  s  .c  o  m
    userRepository.someCustomMethod(new User("one", "two", 42));

    userRepository.deleteInactiveUsers();
    userRepository.deleteOtherUsers();

    userRepository.deleteAll();
    assertEquals("Invalid repository size", 0, userRepository.count());

    userRepository.save(new User("john", "smith", 42));
    userRepository.save(new User("alex", "johns", 33));
    userRepository.save(new User("sam", "brown", 22));
    assertEquals("Invalid repository size", 3, userRepository.count());

    assertNotNull("User not found", userRepository.findUserByName("john"));

    Page<User> users = userRepository.findAll(new PageRequest(0, 100));
    assertEquals("Invalid requested page size", 3, users.getNumberOfElements());

    ExecutorService executorService = Executors.newSingleThreadExecutor();
    executorService.invokeAll(Arrays.asList(Executors.callable(new Runnable() {
        @Override
        public void run() {
            try {
                logger.info("Start concurrent thread");
                UserRepository anotherRepo = userRepository;
                logger.info("count");
                assertEquals("Invalid repository size", 3, anotherRepo.count());
                logger.info("save");
                anotherRepo.save(new User(UUID.randomUUID().toString(), UUID.randomUUID().toString(), 10));
                assertEquals("Invalid repository size", 4, anotherRepo.count());
                logger.info("Stored 4");
            } catch (Exception e) {
                logger.error("Error", e);
            }
        }
    })));

    logger.info("After");
    assertEquals("Invalid repository size", 4, userRepository.count());
    userRepository.deleteAll();
    assertEquals("Invalid repository size", 0, userRepository.count());

    userRepository.someCustomMethod(new User("john", "smith", 42));
}