Example usage for java.util.concurrent Executors newSingleThreadScheduledExecutor

Introduction

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

Prototype

public static ScheduledExecutorService newSingleThreadScheduledExecutor(ThreadFactory threadFactory) 

Source Link

Document

Creates a single-threaded executor that can schedule commands to run after a given delay, or to execute periodically.

Usage

From source file:org.apache.nifi.registry.provider.flow.git.GitFlowMetaData.java

void startPushThread() {
    // If successfully loaded, start pushing thread if necessary.
    if (isEmpty(remoteToPush)) {
        return;//from  ww  w  .j  a  v a2  s .  c  o m
    }

    final ThreadFactory threadFactory = new BasicThreadFactory.Builder().daemon(true)
            .namingPattern(getClass().getSimpleName() + " Push thread").build();

    // Use scheduled fixed delay to control the minimum interval between push activities.
    // The necessity of executing push is controlled by offering messages to the pushQueue.
    // If multiple commits are made within this time window, those are pushed by a single push execution.
    final ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor(threadFactory);
    executorService.scheduleWithFixedDelay(() -> {

        final Long offeredTimestamp;
        try {
            offeredTimestamp = pushQueue.take();
        } catch (InterruptedException e) {
            logger.warn("Waiting for push request has been interrupted due to {}", e.getMessage(), e);
            return;
        }

        logger.debug("Took a push request sent at {} to {}...", offeredTimestamp, remoteToPush);
        final PushCommand pushCommand = new Git(gitRepo).push().setRemote(remoteToPush);
        if (credentialsProvider != null) {
            pushCommand.setCredentialsProvider(credentialsProvider);
        }

        try {
            final Iterable<PushResult> pushResults = pushCommand.call();
            for (PushResult pushResult : pushResults) {
                logger.debug(pushResult.getMessages());
            }
        } catch (GitAPIException e) {
            logger.error(format("Failed to push commits to %s due to %s", remoteToPush, e), e);
        }

    }, 10, 10, TimeUnit.SECONDS);
}

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From source file:org.openecomp.sdc.be.dao.titan.TitanGraphClient.java

/**
 * This method will be invoked ONLY on init time in case Titan storage is
 * down./*from   w w  w . ja  v  a  2  s . com*/
 */
private void startReconnectTask() {
    this.reconnectTask = new ReconnectTask();
    // Initialize a single threaded scheduler
    this.reconnectScheduler = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() {
        @Override
        public Thread newThread(Runnable r) {
            return new Thread(r, "Titan-Reconnect-Task");
        }
    });

    logger.info("Scheduling reconnect task {} with interval of {} seconds", reconnectTask, reconnectInterval);
    reconnectFuture = this.reconnectScheduler.scheduleAtFixedRate(this.reconnectTask, 0, this.reconnectInterval,
            TimeUnit.SECONDS);
}

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From source file:com.clustercontrol.agent.custom.CommandCollector.java

@Override
public void start() {
    // determine startup delay (using monitorId for random seed)
    int delay = new Random(config.getMonitorId().hashCode()).nextInt(config.getInterval());

    // determine startup time
    ////w ww  . j  a  v a2s  .c  o m
    // example)
    //   delay : 15 [sec]
    //   interval : 300 [sec]
    //   now : 2000-1-1 00:00:10
    //   best startup : 2000-1-1 00:00:15
    long now = HinemosTime.currentTimeMillis();
    long startup = config.getInterval() * (now / config.getInterval()) + delay;
    startup = startup > now ? startup : startup + config.getInterval();

    log.info("scheduling command collector. (" + this + ", startup = "
            + String.format("%1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS", new Date(startup)) + ", interval = "
            + config.getInterval() + " [msec])");

    // initialize scheduler thread
    _scheduler = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() {
        private volatile int _count = 0;

        @Override
        public Thread newThread(Runnable r) {
            return new Thread(r, "CommandCollectorScheduler-" + _count++);
        }
    });

    // start scheduler
    // when agent startup. this is called twice. first execution is after interval to avoid double execution.
    _scheduler.scheduleWithFixedDelay(this, startup - now, config.getInterval(), TimeUnit.MILLISECONDS);
}

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From source file:org.codice.ddf.opensearch.source.OpenSearchSource.java

private void updateScheduler() {
    LOGGER.debug("Setting availability poll task for {} minute(s) on Source {}", pollInterval, getId());

    isAvailable = false;//from www .ja va2 s  .com

    if (scheduler != null) {
        LOGGER.debug("Cancelling availability poll task on Source {}", getId());
        scheduler.shutdownNow();
    }

    scheduler = Executors.newSingleThreadScheduledExecutor(
            StandardThreadFactoryBuilder.newThreadFactory("openSearchSourceThread"));

    scheduler.scheduleWithFixedDelay(new Runnable() {
        private boolean availabilityCheck() {
            LOGGER.debug("Checking availability for source {} ", getId());
            try {
                final WebClient client = factory.getWebClient();
                final Response response = client.head();
                return response != null && !(response.getStatus() >= 404 || response.getStatus() == 402);
            } catch (Exception e) {
                LOGGER.debug("Web Client was unable to connect to endpoint.", e);
                return false;
            }
        }

        @Override
        public void run() {
            isAvailable = availabilityCheck();
        }
    }, 1, pollInterval.longValue() * 60L, TimeUnit.SECONDS);
}

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From source file:org.apache.pulsar.broker.PulsarService.java

public PulsarService(ServiceConfiguration config, Optional<WorkerService> functionWorkerService) {
    // Validate correctness of configuration
    PulsarConfigurationLoader.isComplete(config);

    state = State.Init;/*  w  w  w.  ja  v a 2 s . c  o m*/
    this.bindAddress = ServiceConfigurationUtils.getDefaultOrConfiguredAddress(config.getBindAddress());
    this.advertisedAddress = advertisedAddress(config);
    this.webServiceAddress = webAddress(config);
    this.webServiceAddressTls = webAddressTls(config);
    this.brokerServiceUrl = brokerUrl(config);
    this.brokerServiceUrlTls = brokerUrlTls(config);
    this.brokerVersion = PulsarBrokerVersionStringUtils.getNormalizedVersionString();
    this.config = config;
    this.shutdownService = new MessagingServiceShutdownHook(this);
    this.loadManagerExecutor = Executors
            .newSingleThreadScheduledExecutor(new DefaultThreadFactory("pulsar-load-manager"));
    this.functionWorkerService = functionWorkerService;
}

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From source file:com.numenta.core.service.DataService.java

@Override
public void onCreate() {
    super.onCreate();
    Log.i(TAG, "Service started");
    AlarmReceiver alarm = new AlarmReceiver();
    alarm.startAlarm(getApplicationContext());

    // Initialize thread pools
    _timer = Executors.newSingleThreadScheduledExecutor(TIMER_THREAD_FACTORY);
    _ioThreadPool = Executors.newFixedThreadPool(IOTHREAD_POOL_SIZE, IO_THREAD_FACTORY);
    _workerPool = Executors.newCachedThreadPool(WORKER_THREAD_FACTORY);// Executors.newFixedThreadPool(WORKER_POOL_SIZE);

    // Optimize HTTP connection by keeping the HTTP connections alive and
    // reusing them
    System.getProperties().setProperty("sun.net.http.errorstream.enableBuffering", "true");
    System.getProperties().setProperty("http.maxConnections", String.valueOf(HTTP_CONNECTION_POOL_SIZE));

    startScheduledTasks();//from w w w . j  av  a2s.  c o m

    // Start Metric Data Sync Service
    _dataSyncService = HTMApplication.getInstance().createDataSyncService(this);
    _dataSyncService.start();

    // TODO: Start Notification Service, taking into account prefs
    _notificationService = HTMApplication.getInstance().createNotificationService(this);
    _notificationService.start();
}

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From source file:com.numenta.core.service.GrokService.java

@Override
public void onCreate() {
    super.onCreate();
    Log.i(TAG, "Service started");
    AlarmReceiver alarm = new AlarmReceiver();
    alarm.startAlarm(getApplicationContext());

    // Initialize thread pools
    _timer = Executors.newSingleThreadScheduledExecutor(TIMER_THREAD_FACTORY);
    _ioThreadPool = Executors.newFixedThreadPool(IOTHREAD_POOL_SIZE, IO_THREAD_FACTORY);
    _workerPool = Executors.newCachedThreadPool(WORKER_THREAD_FACTORY);// Executors.newFixedThreadPool(WORKER_POOL_SIZE);

    // Optimize HTTP connection by keeping the HTTP connections alive and
    // reusing them
    System.getProperties().setProperty("sun.net.http.errorstream.enableBuffering", "true");
    System.getProperties().setProperty("http.maxConnections", String.valueOf(HTTP_CONNECTION_POOL_SIZE));

    startScheduledTasks();//ww  w  .j  a  va 2 s . c  om

    // Start Metric Data Sync Service
    _dataSyncService = GrokApplication.getInstance().createDataSyncService(this);
    _dataSyncService.start();

    // TODO: Start Notification Service, taking into account prefs
    _notificationService = GrokApplication.getInstance().createNotificationService(this);
    _notificationService.start();
}

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From source file:ws.wamp.jawampa.WampRouter.java

WampRouter(Map<String, RealmConfig> realms) {

    // Populate the realms from the configuration
    this.realms = new HashMap<String, Realm>();
    for (Map.Entry<String, RealmConfig> e : realms.entrySet()) {
        Realm info = new Realm(e.getValue());
        this.realms.put(e.getKey(), info);
    }//from  w w  w .ja va  2 s  .co m

    // Create an eventloop and the RX scheduler on top of it
    this.eventLoop = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() {
        @Override
        public Thread newThread(Runnable r) {
            Thread t = new Thread(r, "WampRouterEventLoop");
            t.setDaemon(true);
            return t;
        }
    });
    this.scheduler = Schedulers.from(eventLoop);

    idleChannels = new HashSet<IConnectionController>();
}

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From source file:gobblin.yarn.GobblinYarnAppLauncher.java

public GobblinYarnAppLauncher(Config config, YarnConfiguration yarnConfiguration) throws IOException {
    this.config = config;

    this.applicationName = config.getString(GobblinYarnConfigurationKeys.APPLICATION_NAME_KEY);
    this.appQueueName = config.getString(GobblinYarnConfigurationKeys.APP_QUEUE_KEY);

    String zkConnectionString = config.getString(GobblinClusterConfigurationKeys.ZK_CONNECTION_STRING_KEY);
    LOGGER.info("Using ZooKeeper connection string: " + zkConnectionString);

    this.helixManager = HelixManagerFactory.getZKHelixManager(
            config.getString(GobblinClusterConfigurationKeys.HELIX_CLUSTER_NAME_KEY),
            GobblinClusterUtils.getHostname(), InstanceType.SPECTATOR, zkConnectionString);

    this.yarnConfiguration = yarnConfiguration;
    this.yarnConfiguration.set("fs.automatic.close", "false");
    this.yarnClient = YarnClient.createYarnClient();
    this.yarnClient.init(this.yarnConfiguration);

    this.fs = config.hasPath(ConfigurationKeys.FS_URI_KEY)
            ? FileSystem.get(URI.create(config.getString(ConfigurationKeys.FS_URI_KEY)), this.yarnConfiguration)
            : FileSystem.get(this.yarnConfiguration);
    this.closer.register(this.fs);

    this.applicationStatusMonitor = Executors.newSingleThreadScheduledExecutor(
            ExecutorsUtils.newThreadFactory(Optional.of(LOGGER), Optional.of("GobblinYarnAppStatusMonitor")));
    this.appReportIntervalMinutes = config
            .getLong(GobblinYarnConfigurationKeys.APP_REPORT_INTERVAL_MINUTES_KEY);

    this.appMasterJvmArgs = config.hasPath(GobblinYarnConfigurationKeys.APP_MASTER_JVM_ARGS_KEY)
            ? Optional.of(config.getString(GobblinYarnConfigurationKeys.APP_MASTER_JVM_ARGS_KEY))
            : Optional.<String>absent();

    this.sinkLogRootDir = new Path(config.getString(GobblinYarnConfigurationKeys.LOGS_SINK_ROOT_DIR_KEY));

    this.maxGetApplicationReportFailures = config
            .getInt(GobblinYarnConfigurationKeys.MAX_GET_APP_REPORT_FAILURES_KEY);

    this.emailNotificationOnShutdown = config
            .getBoolean(GobblinYarnConfigurationKeys.EMAIL_NOTIFICATION_ON_SHUTDOWN_KEY);
}

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From source file:org.apache.pulsar.broker.loadbalance.impl.SimpleLoadManagerImpl.java

public SimpleLoadManagerImpl() {
    scheduler = Executors
            .newSingleThreadScheduledExecutor(new DefaultThreadFactory("pulsar-simple-load-manager"));
    this.sortedRankings.set(new TreeMap<>());
    this.currentLoadReports = new HashMap<>();
    this.resourceUnitRankings = new HashMap<>();
    this.loadBalancingMetrics.set(Lists.newArrayList());
    this.realtimeResourceQuotas.set(new HashMap<>());
    this.realtimeAvgResourceQuota = new ResourceQuota();
    placementStrategy = new WRRPlacementStrategy();
    bundleGainsCache = new HashSet<>();
    bundleLossesCache = new HashSet<>();
    brokerCandidateCache = new HashSet<>();
    availableBrokersCache = new HashSet<>();
    brokerToNamespaceToBundleRange = new HashMap<>();
}

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