Example usage for java.util.concurrent Executors newFixedThreadPool

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

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

Introduction

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

Prototype

public static ExecutorService newFixedThreadPool(int nThreads)

Source Link

Document

Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue.

Usage

From source file:com.num.mobiperf.AccountSelector.java

public AccountSelector(Context context) {
    this.context = context;
    this.checkinExecutor = Executors.newFixedThreadPool(1);
    //this.phoneUtils = PhoneUtils.getPhoneUtils();
}

From source file:kafka.deploy.utils.command.CommandRemoteOperation.java

/**
 * Executes the given commands in parallel on the remote hosts and
 * aggregates the results for the caller.
 * //  www  . j a  v  a  2s  .co  m
 * @param hostNameCommandLineMap Map with a key is the external host name
 *        and the value is the command line to execute remotely on that host
 * 
 * @return List of result types as dictated by the subclass
 * 
 * @throws RemoteOperationException Thrown on error invoking the command on
 *         one or more clients.
 */
protected void execute(Map<String, String> hostNameCommandLineMap) throws RemoteOperationException {

    ExecutorService threadPool = Executors.newFixedThreadPool(hostNameCommandLineMap.size());
    List<Future<?>> futures = new ArrayList<Future<?>>();

    for (Map.Entry<String, String> entry : hostNameCommandLineMap.entrySet()) {
        String hostName = entry.getKey();
        String commandLine = entry.getValue();

        if (logger.isDebugEnabled())
            logger.debug("Command to execute: " + commandLine);

        List<String> commandArgs = parse(commandLine);
        UnixCommand command = new UnixCommand(hostName, commandArgs);
        Callable<?> callable = getCallable(command);
        Future<?> future = threadPool.submit(callable);
        futures.add(future);
    }

    // Build up a list of all the results and/or capture the errors as they
    // occur.
    try {
        StringBuilder errors = new StringBuilder();

        for (Future<?> future : futures) {
            Throwable t = null;

            try {
                future.get();
            } catch (ExecutionException ex) {
                t = ex.getCause();
            } catch (Exception e) {
                t = e;
            }

            if (t != null) {
                if (logger.isWarnEnabled())
                    logger.warn(t, t);

                if (errors.length() > 0)
                    errors.append("; ");

                errors.append(t.getMessage());
            }
        }

        if (errors.length() > 0)
            throw new RemoteOperationException(errors.toString());
    } finally {
        threadPool.shutdown();

        try {
            threadPool.awaitTermination(60, TimeUnit.SECONDS);
        } catch (InterruptedException e) {
            if (logger.isWarnEnabled())
                logger.warn(e, e);
        }
    }
}

From source file:com.otz.transport.consumer.dispatcher.FunnelEventDispatcher.java

@PostConstruct
public void init() {
    if (loadedPlugins.getNames().contains(FUNNEL)) {
        String numberOfThreads = environment
                .getProperty(environment.getActiveProfiles()[0] + SERVICES + FUNNEL);

        int dispatchersCount = Integer.parseInt(numberOfThreads);

        executorService = Executors.newFixedThreadPool(dispatchersCount);

        //subscriptions.
        for (int i = 0; i < dispatchersCount; i++) {
            FunnelEventRunnable funnelEventRunnable = new FunnelEventRunnable(this, kafkaProperties, 200);
            listeners.add(funnelEventRunnable);
            executorService.submit(funnelEventRunnable);
        }/*from  w w  w  .j a va  2s .co m*/

    }
}

From source file:com.vmware.photon.controller.cloudstore.xenon.entity.IpLeaseServiceTest.java

@BeforeSuite
public void beforeSuite() throws Throwable {
    host = BasicServiceHost.create();// www .j a  va 2s.co m
    ServiceHostUtils.startFactoryServices(host, CloudStoreServiceGroup.FACTORY_SERVICES_MAP);

    StaticServerSet serverSet = new StaticServerSet(
            new InetSocketAddress(host.getPreferredAddress(), host.getPort()));
    xenonClient = new XenonRestClient(serverSet, Executors.newFixedThreadPool(128),
            Executors.newScheduledThreadPool(1), host);
    xenonClient.start();
}

From source file:com.vmware.photon.controller.cloudstore.xenon.entity.DhcpSubnetServiceTest.java

@BeforeSuite
public void beforeSuite() throws Throwable {
    host = BasicServiceHost.create();//from  www  . j a va2s . co m
    ServiceHostUtils.startFactoryServices(host, CloudStoreServiceGroup.FACTORY_SERVICES_MAP);

    StaticServerSet serverSet = new StaticServerSet(
            new InetSocketAddress(host.getPreferredAddress(), host.getPort()));
    xenonClient = new XenonRestClient(serverSet, Executors.newFixedThreadPool(128),
            Executors.newScheduledThreadPool(1));
    xenonClient.start();
}

From source file:org.kordamp.javatrove.example01.AppModule.java

protected void bindExecutorService() {
    bind(ExecutorService.class).toInstance(Executors.newFixedThreadPool(1));
}

From source file:com.lovejoy777sarootool.rootool.preview.IconPreview.java

public IconPreview(Activity activity) {
    mContext = activity;/* ww  w  .j  a v a  2 s.c  o m*/
    mWidth = (int) mContext.getResources().getDimension(R.dimen.item_height);
    cache = new ConcurrentHashMap<String, Bitmap>();
    pool = Executors.newFixedThreadPool(5);
    mResources = activity.getResources();
    pm = mContext.getPackageManager();

    if (mMimeTypeIconCache == null) {
        mMimeTypeIconCache = new DrawableLruCache<String>();
    }
}

From source file:eu.freme.bpt.service.AbstractService.java

public void run(final FailurePolicy failurePolicy, final int nrThreads, final Callback callback) {
    logger.info("Running service {}", this.getClass().getName());
    ExecutorService executorService = Executors.newFixedThreadPool(nrThreads);
    Unirest.setTimeouts(30000, 300000); // TODO: configurable?
    while (ioIterator.hasNext()) {
        final IO io = ioIterator.next();

        executorService.submit(() -> {
            try (final InputStream inputStream = io.getInputStream();
                    final OutputStream outputStream = io.getOutputStream()) {
                byte[] input = IOUtils.toByteArray(inputStream);
                HttpResponse<InputStream> response = Unirest.post(endpoint).headers(headers)
                        .queryString(parameters).body(input).asBinary();
                if (response.getStatus() == 200) {
                    logger.debug("Request alright.");
                    try (InputStream responseInput = response.getBody()) {
                        IOUtils.copy(responseInput, outputStream);
                        callback.onTaskComplete(io.getInputFile(), io.getOutputFile());
                    } catch (IOException e) {
                        logger.error("Error while writing response.", e);
                        callback.onTaskFails(io.getInputFile(), io.getOutputFile(),
                                "Error while writing response. " + e.getMessage());
                        if (!failurePolicy.check()) {
                            System.exit(3);
                        }/*from w ww .  ja  v a  2s.co m*/
                    }
                } else {
                    String body = IOUtils.toString(response.getBody());
                    String msg = "Error response from service " + endpoint + ": Status " + response.getStatus()
                            + ": " + response.getStatusText() + " - " + body;
                    logger.error(msg);
                    callback.onTaskFails(io.getInputFile(), io.getOutputFile(), msg);
                    if (!failurePolicy.check()) {
                        System.exit(3);
                    }
                }
            } catch (Exception e) {
                logger.error("Request to {} failed." + endpoint, e);
                callback.onTaskFails(io.getInputFile(), io.getOutputFile(),
                        "Request to " + endpoint + " failed. " + e.getMessage());
                if (!failurePolicy.check()) {
                    System.exit(3);
                }
            }
        });
    }
    executorService.shutdown();
    try {
        executorService.awaitTermination(1, TimeUnit.DAYS);
    } catch (InterruptedException e) {
        logger.warn("Waiting on termination interrupted.");
    }
    callback.onBatchComplete();
}

From source file:com.otz.transport.consumer.dispatcher.HipchatEventDispatcher.java

@PostConstruct
public void init() {
    if (loadedPlugins.getNames().contains(HIPCHAT)) {
        String numberOfThreads = environment
                .getProperty(environment.getActiveProfiles()[0] + SERVICES + HIPCHAT);

        int dispatchersCount = Integer.parseInt(numberOfThreads);

        executorService = Executors.newFixedThreadPool(dispatchersCount);

        //subscriptions.
        for (int i = 0; i < dispatchersCount; i++) {
            HtipchatNotificationRunnable htipchatNotificationRunnable = new HtipchatNotificationRunnable(this,
                    kafkaProperties, 200);
            listeners.add(htipchatNotificationRunnable);
            executorService.submit(htipchatNotificationRunnable);
        }//from ww w .ja  v  a  2s.c om

    }
}

From source file:com.predic8.membrane.examples.tests.integration.OAuth2RaceCondition.java

@Test
public void testSessionIdStateRaceCondition() throws Exception {
    HttpClient hc = HttpClientBuilder.create().build();

    login(hc);/*from ww  w. j a v a 2 s  . co m*/
    System.out.println("Logged in");
    ExecutorService executor = Executors.newFixedThreadPool(2);
    for (int i = 0; i < 10; i++) {

        //            HttpClient hc1 = HttpClientBuilder.create().build();
        //            login(hc1);
        Future<Exception>[] results = new Future[2];

        int parallelReqs = 2;
        CountDownLatch cdl = new CountDownLatch(parallelReqs);

        for (int j = 0; j < parallelReqs; j++) {
            final int fj = j;
            results[j] = executor.submit(() -> {
                try {
                    int uri = (fj % 2 == 0 ? 1 : 2);
                    String url = "http://localhost:2011/test" + uri;
                    HttpGet get = new HttpGet(url);
                    //setNoRedirects(get);
                    cdl.countDown();
                    cdl.await();
                    try (CloseableHttpResponse getRes = (CloseableHttpResponse) hc.execute(get)) {
                        assertEquals(200, getRes.getStatusLine().getStatusCode());
                        String resText = EntityUtils.toString(getRes.getEntity(), "UTF-8");
                        System.out.println("Called: Test" + uri + ".\nActual: " + resText);
                        assertTrue(resText.contains(Integer.toString(uri)));
                    }
                    return null;
                } catch (Exception e) {
                    return e;
                }
            });
        }
        for (int j = 0; j < parallelReqs; j++) {
            results[j].get();
        }

        for (int j = 0; j < parallelReqs; j++) {
            Exception e = results[j].get();
            if (e != null)
                throw new RuntimeException(e);
        }

    }
    executor.shutdown();
}