Example usage for java.util List wait

Introduction

In this page you can find the example usage for java.util List wait.

Prototype

public final void wait() throws InterruptedException 

Source Link

Document

Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Usage

From source file:org.camunda.bpm.ext.sdk.impl.workers.PollTasksRunnable.java

protected void acquire() {
    final List<WorkerRegistrationImpl> registrations = workerManager.getRegistrations();
    final MultiPollRequestDto request = new MultiPollRequestDto();
    final Map<String, Worker> workerMap = new HashMap<String, Worker>();

    request.clear();//from w w  w.  j  av  a2 s.  c om
    workerMap.clear();

    synchronized (registrations) {
        int numOfRegistrations = registrations.size();

        if (numOfRegistrations == 0) {
            try {
                registrations.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
                // TODO
            }
        }

        for (WorkerRegistrationImpl registration : registrations) {
            request.topics.add(new PollInstructionDto(registration.getTopicName(), registration.getLockTime(),
                    registration.getVariableNames()));
            workerMap.put(registration.getTopicName(), registration.getWorker());
        }

    }

    int tasksAcquired = 0;

    try {
        tasksAcquired = poll(request, workerMap);
    } catch (Exception e) {
        LOG.exceptionDuringPoll(e);
    }

    if (tasksAcquired == 0) {
        try {
            // back-off
            backoffStrategy.run();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    } else {
        backoffStrategy.reset();
    }
}

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From source file:com.ccc.crest.core.client.CrestClient.java

public ClientElement getFreeClient(List<ClientElement> from) {
    ClientElement client = null;//from  w  w  w . jav  a 2  s  . c  o m
    synchronized (from) {
        boolean found = false;
        do {
            for (ClientElement cliente : from)
                if (!cliente.inuse.get()) {
                    cliente.inuse.set(true);
                    client = cliente;
                    found = true;
                    break;
                }
            if (found)
                break;
            try {
                from.wait();
            } catch (InterruptedException e) {
                log.warn("unexpected wakeup", e);
            }
        } while (true);

    }
    return client;
}

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From source file:org.commonreality.participant.impl.RequestableObjectManagerDelegate.java

/**
 * get a free identifier that is keyed on key. this may block if none are
 * available/*  w ww .j  a  v a 2  s . c o m*/
 * 
 * @param key
 * @return
 */
final public IIdentifier getFreeIdentifier(Object key) {
    /*
     * first get the keyed list
     */
    List<IIdentifier> keyedIdentifiers = getKeyedCollection(key);

    IIdentifier rtn = null;
    boolean mustRequest = false;
    synchronized (keyedIdentifiers) {
        // don't actually request from within the sync.
        mustRequest = keyedIdentifiers.size() == 0;
    }

    if (mustRequest)
        request(key);

    synchronized (keyedIdentifiers) {
        try {
            while (keyedIdentifiers.size() == 0)
                keyedIdentifiers.wait();
        } catch (InterruptedException ie) {
            if (LOGGER.isDebugEnabled())
                LOGGER.debug("Interrupted while waiting for free identifier");
        }

        if (keyedIdentifiers.size() != 0)
            rtn = keyedIdentifiers.remove(0);

        mustRequest = keyedIdentifiers.size() <= _requestMore;
    }
    // don't request from within the synch
    if (mustRequest)
        request(key);

    if (LOGGER.isDebugEnabled())
        LOGGER.debug("Returning new requested id " + rtn);
    return rtn;
}

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