Example usage for java.util.concurrent Callable Callable

List of usage examples for java.util.concurrent Callable Callable

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Introduction

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

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Callable

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Usage

From source file:com.rogiel.httpchannel.http.Request.java

public Future<HttpResponse> requestAsync() throws IOException {
    return ctx.threadPool.submit(new Callable<HttpResponse>() {
        @Override/*ww w.j ava  2 s.c o  m*/
        public HttpResponse call() throws Exception {
            return request();
        }
    });
}

From source file:com.linkedin.pinot.common.segment.fetcher.HttpSegmentFetcher.java

@Override
public void fetchSegmentToLocal(final String uri, final File tempFile) throws Exception {
    RetryPolicies.exponentialBackoffRetryPolicy(_retryCount, _retryWaitMs, 5).attempt(new Callable<Boolean>() {
        @Override//ww w . j  a  v a  2  s . com
        public Boolean call() throws Exception {
            try {
                int statusCode = _httpClient.downloadFile(new URI(uri), tempFile);
                _logger.info(
                        "Downloaded file from: {} to: {}; Length of downloaded file: {}; Response status code: {}",
                        uri, tempFile, tempFile.length(), statusCode);
                return true;
            } catch (HttpErrorStatusException e) {
                int statusCode = e.getStatusCode();
                if (statusCode >= 500) {
                    // Temporary exception
                    _logger.warn("Caught temporary exception while downloading file from: {}, will retry", uri,
                            e);
                    return false;
                } else {
                    // Permanent exception
                    _logger.error("Caught permanent exception while downloading file from: {}, won't retry",
                            uri, e);
                    throw e;
                }
            } catch (Exception e) {
                _logger.warn("Caught temporary exception while downloading file from: {}, will retry", uri, e);
                return false;
            }
        }
    });
}

From source file:aos.camel.JavaFutureTest.java

@Test
public void testFutureWithDone() throws Exception {
    // this is the task we want to execute async
    // usually the task is something that takes
    // some time to do
    Callable<String> task = new Callable<String>() {
        public String call() throws Exception {
            // do something that takes some time
            LOG.info("Starting to process task");
            Thread.sleep(5000);/*from  w  w w.  j  a  v  a2 s.c o  m*/
            LOG.info("Task is now done");
            return "Camel rocks";
        }
    };

    // this is the thread pool we will use
    ExecutorService executor = Executors.newCachedThreadPool();

    // now submit the task to the thread pool
    // and get the Future handle back so we can later get the result
    LOG.info("Submitting task to ExecutorService");
    Future<String> future = executor.submit(task);
    LOG.info("Task submitted and we got a Future handle");

    // test when we are done
    boolean done = false;
    while (!done) {
        done = future.isDone();
        LOG.info("Is the task done? " + done);
        if (!done) {
            Thread.sleep(2000);
        }
    }

    // and get the answer
    String answer = future.get();
    LOG.info("The answer is: " + answer);
}

From source file:cherry.foundation.mail.SendMailBatchTest.java

@Test
public void testNormal() throws Exception {

    final File shutdownTrigger = new File("./shutdownTrigger.txt");
    shutdownTrigger.deleteOnExit();/*from   ww w .j a  v a 2 s .  c  o m*/
    Callable<Boolean> callable = new Callable<Boolean>() {
        @Override
        public Boolean call() {
            try (FileOutputStream os = new FileOutputStream(shutdownTrigger)) {
                return true;
            } catch (IOException ex) {
                return false;
            }
        }
    };

    ScheduledExecutorService service = Executors.newScheduledThreadPool(1);
    ScheduledFuture<Boolean> future = service.schedule(callable, 5L, TimeUnit.SECONDS);

    SendMailBatch batch = create(1000L, shutdownTrigger, false);
    ExitStatus status = batch.execute();

    assertEquals(ExitStatus.NORMAL, status);
    assertTrue(future.get().booleanValue());
    assertFalse(shutdownTrigger.exists());

    verify(bizDateTime, atLeastOnce()).now();
    verify(mailSendHandler, atLeastOnce()).listMessage((LocalDateTime) eq(null));
    verify(mailSendHandler, atLeastOnce()).sendMessage(eq(1L));
    verify(mailSendHandler, atLeastOnce()).sendMessage(eq(2L));
    verify(mailSendHandler, atLeastOnce()).sendMessage(eq(3L));
}

From source file:no.ntnu.idi.socialhitchhiking.map.RouteProvider.java

/**
 * Returning a {@link MapRoute}, containing data that is retrieved from Google Maps.
 * //w w  w  .  ja  v  a  2  s . c o  m
 * @param fromLat The latitude where the route starts.
 * @param fromLon The longitude where the route starts.
 * @param toLat The latitude where the route ends.
 * @param toLon The latitude where the route ends.
 * @return Returns a {@link MapRoute} containing all the map data needed for showing a route in a map view.
 * @throws MalformedURLException 
 * @throws ParserConfigurationException
 * @throws SAXException
 * @throws IOException
 * @throws XmlPullParserException 
 */
public static MapRoute getRoute(double fromLat, double fromLon, double toLat, double toLon,
        final boolean drawable) throws MalformedURLException, IOException, XmlPullParserException {
    final String url = RouteProvider.getUrl(fromLat, fromLon, toLat, toLon);
    ExecutorService executor = Executors.newSingleThreadExecutor();

    Callable<MapRoute> callable = new Callable<MapRoute>() {
        @Override
        public MapRoute call() throws ClientProtocolException, IOException, XmlPullParserException {
            InputStream is = RouteProvider.getConnectionInputStream(url);

            MapRoute temp = new MapRoute();
            temp = RouteProvider.getRoute(is, drawable);
            return temp;
        }
    };
    Future<MapRoute> future = executor.submit(callable);
    MapRoute ret;
    try {
        ret = future.get();
    } catch (InterruptedException e) {
        ret = null;
    } catch (ExecutionException e) {
        // TODO Auto-generated catch block
        ret = null;
    }
    executor.shutdown();
    return ret;

}

From source file:com.microsoft.windowsazure.management.scheduler.SchedulerIntegrationTestBase.java

protected static void createSchedulerManagementService() throws Exception {
    Configuration config = createConfiguration();
    config.setProperty(ApacheConfigurationProperties.PROPERTY_RETRY_HANDLER,
            new DefaultHttpRequestRetryHandler());
    schedulerManagementClient = SchedulerManagementService.create(config);
    addClient((ServiceClient<?>) schedulerManagementClient, new Callable<Void>() {
        @Override/*w ww  .  j a v a  2 s  .  c o m*/
        public Void call() throws Exception {
            createSchedulerManagementService();
            return null;
        }
    });
}

From source file:com.netflix.curator.framework.recipes.barriers.TestDistributedBarrier.java

@Test
public void testServerCrash() throws Exception {
    final int TIMEOUT = 1000;

    final CuratorFramework client = CuratorFrameworkFactory.builder().connectString(server.getConnectString())
            .connectionTimeoutMs(TIMEOUT).retryPolicy(new RetryOneTime(1)).build();
    try {/*  w w  w .j a v a  2 s. c o  m*/
        client.start();

        final DistributedBarrier barrier = new DistributedBarrier(client, "/barrier");
        barrier.setBarrier();

        final ExecutorService service = Executors.newSingleThreadExecutor();
        Future<Object> future = service.submit(new Callable<Object>() {
            @Override
            public Object call() throws Exception {
                Thread.sleep(TIMEOUT / 2);
                server.stop();
                return null;
            }
        });

        barrier.waitOnBarrier(TIMEOUT * 2, TimeUnit.SECONDS);
        future.get();
        Assert.fail();
    } catch (KeeperException.ConnectionLossException expected) {
        // expected
    } finally {
        client.close();
    }
}

From source file:com.github.jknack.handlebars.cache.GuavaTemplateCache.java

@Override
public Template get(final TemplateSource source, final Parser parser) throws IOException {
    notNull(source, "The source is required.");
    notNull(parser, "The parser is required.");
    try {/*ww w. j  a v a  2 s  .  co  m*/
        return cache.get(source, new Callable<Template>() {
            @Override
            public Template call() throws IOException {
                return parser.parse(source);
            }
        });
    } catch (ExecutionException ex) {
        throw launderThrowable(source, ex.getCause());
    }
}

From source file:org.apache.lucene.replicator.http.HttpReplicator.java

@Override
public SessionToken checkForUpdate(String currVersion) throws IOException {
    String[] params = null;//from   w  w w . j  a v  a  2s .  co  m
    if (currVersion != null) {
        params = new String[] { ReplicationService.REPLICATE_VERSION_PARAM, currVersion };
    }
    final HttpResponse response = executeGET(ReplicationAction.UPDATE.name(), params);
    return doAction(response, new Callable<SessionToken>() {
        @Override
        public SessionToken call() throws Exception {
            final DataInputStream dis = new DataInputStream(responseInputStream(response));
            try {
                if (dis.readByte() == 0) {
                    return null;
                } else {
                    return new SessionToken(dis);
                }
            } finally {
                dis.close();
            }
        }
    });
}

From source file:org.zenoss.zep.dao.impl.DaoUtilsTest.java

@Test
public void testDeadlockRetryNestedException() throws Exception {
    final AtomicInteger i = new AtomicInteger();
    final int returnVal = new Random().nextInt();
    int result = DaoUtils.deadlockRetry(new Callable<Integer>() {
        @Override//from w w  w. j a  v a2s.  co m
        public Integer call() throws Exception {
            if (i.incrementAndGet() < 5) {
                throw new RuntimeException(new DeadlockLoserDataAccessException("My fake exception", null));
            }
            return returnVal;
        }
    });
    assertEquals(i.get(), 5);
    assertEquals(result, returnVal);
}