Example usage for java.util.concurrent.locks ReentrantLock ReentrantLock

Introduction

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

Prototype

public ReentrantLock(boolean fair) 

Source Link

Document

Creates an instance of ReentrantLock with the given fairness policy.

Usage

From source file:Main.java

public static void main(String[] args) {
    int[] runningThreads = { 0 };
    int[] taskcount = { 10 };
    Lock myLock = new ReentrantLock(true);
    int maxThreadQty = 3;
    while ((taskcount[0] > 0) && (runningThreads[0] < maxThreadQty)) {
        myLock.lock();//from  www. j  a va2 s  .  co  m
        runningThreads[0]++;
        myLock.unlock();
        new Thread("T") {
            public void run() {
                myLock.lock();
                taskcount[0]--;
                runningThreads[0]--;
                myLock.unlock();
            }
        }.start();
    }
}

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From source file:eu.riscoss.server.DBConnector.java

private static void lock(String domain) {

    ReentrantLock lock = locks.get(domain);

    if (lock == null) {
        lock = new ReentrantLock(true);
        locks.put(domain, lock);//from  ww w.  j  av a  2  s  .c  o  m
    }

    System.out.println("'" + domain + "' locked by " + Thread.currentThread());
    //      Thread.dumpStack();
    lock.lock();
}

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From source file:cherry.foundation.numbering.SimpleNumberingStore.java

@Override
public synchronized long loadAndLock(String numberName) {
    Lock lock = lockMap.get(numberName);
    if (lock == null) {
        lock = new ReentrantLock(true);
        lockMap.put(numberName, lock);//from   www  .  j  a v  a  2s .  c  om
    }
    lock.lock();
    return currentValueMap.get(numberName).longValue();
}

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From source file:org.jenkinsci.plugins.mesos.MesosRetentionStrategy.java

private void readResolve() {
    computerCheckLock = new ReentrantLock(false);
}

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From source file:org.springframework.integration.store.MessageGroupQueue.java

public MessageGroupQueue(MessageGroupStore messageGroupStore, Object groupId) {
    this(messageGroupStore, groupId, DEFAULT_CAPACITY, new ReentrantLock(true));
}

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From source file:org.springframework.integration.store.MessageGroupQueue.java

public MessageGroupQueue(MessageGroupStore messageGroupStore, Object groupId, int capacity) {
    this(messageGroupStore, groupId, capacity, new ReentrantLock(true));
}

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From source file:massbank.svn.SVNOperation.java

public SVNOperation(String repoDirName, String wcName) throws SVNException {
    repoDirName = SVNUtils.escapeDirName(repoDirName);

    String repoURL = SVNServiceManager.SVN_BASE_URL;
    if (wcName.equals(WC_OPEN_DATA)) {
        repoURL += "OpenData/record/" + repoDirName;
    } else {//w  w w.  j  ava  2 s.  c o m
        repoURL += "BackupData/" + repoDirName;
    }
    this.workCopyPath = SVNUtils.getWorkCopyPath(repoDirName, wcName);
    if (!rlockList.containsKey(this.workCopyPath)) {
        this.rlock = new ReentrantLock(true);
        this.rlockList.put(this.workCopyPath, this.rlock);
    } else {
        this.rlock = this.rlockList.get(this.workCopyPath);
    }
    //      logger.severe("** LOCK:" + this.workCopyPath);
    this.rlock.lock();

    this.svnClient = new SVNClientWrapper(repoURL, this.workCopyPath);
    if (wcName.equals(WC_BACKUP_UPLOAD) || wcName.equals(WC_OPEN_DATA)) {
        checkout();
    }
    this.ipAddress = SVNUtils.getLocalIPAddress();
}

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From source file:com.github.horrorho.liquiddonkey.cloud.Authenticator.java

Authenticator(String id, String password, Auth auth) {
    this(id, password, new ReentrantLock(false), Token.from(auth), null);
}

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From source file:io.fabric8.maven.core.service.PortForwardService.java

/**
 * Forwards a port to the newest pod matching the given selector.
 * If another pod is created, it forwards connections to the new pod once it's ready.
 *//*w w w  .j av a 2s .c  o m*/
public Closeable forwardPortAsync(final Logger externalProcessLogger, final LabelSelector podSelector,
        final int remotePort, final int localPort) throws Fabric8ServiceException {

    final Lock monitor = new ReentrantLock(true);
    final Condition podChanged = monitor.newCondition();
    final Pod[] nextForwardedPod = new Pod[1];

    final Thread forwarderThread = new Thread() {
        @Override
        public void run() {

            Pod currentPod = null;
            Closeable currentPortForward = null;

            try {
                monitor.lock();

                while (true) {
                    if (podEquals(currentPod, nextForwardedPod[0])) {
                        podChanged.await();
                    } else {
                        Pod nextPod = nextForwardedPod[0]; // may be null
                        try {
                            monitor.unlock();
                            // out of critical section

                            if (currentPortForward != null) {
                                log.info("Closing port-forward from pod %s",
                                        KubernetesHelper.getName(currentPod));
                                currentPortForward.close();
                                currentPortForward = null;
                            }

                            if (nextPod != null) {
                                log.info("Starting port-forward to pod %s", KubernetesHelper.getName(nextPod));
                                currentPortForward = forwardPortAsync(externalProcessLogger,
                                        KubernetesHelper.getName(nextPod), remotePort, localPort);
                            } else {
                                log.info("Waiting for a pod to become ready before starting port-forward");
                            }
                            currentPod = nextPod;
                        } finally {
                            monitor.lock();
                        }
                    }

                }

            } catch (InterruptedException e) {
                log.debug("Port-forwarding thread interrupted", e);
                Thread.currentThread().interrupt();
            } catch (Exception e) {
                log.warn("Error while port-forwarding to pod", e);
            } finally {
                monitor.unlock();

                if (currentPortForward != null) {
                    try {
                        currentPortForward.close();
                    } catch (Exception e) {
                    }
                }
            }
        }
    };

    // Switching forward to the current pod if present
    Pod newPod = getNewestPod(podSelector);
    nextForwardedPod[0] = newPod;

    final Watch watch = KubernetesClientUtil.withSelector(kubernetes.pods(), podSelector, log)
            .watch(new Watcher<Pod>() {

                @Override
                public void eventReceived(Action action, Pod pod) {
                    monitor.lock();
                    try {
                        List<Pod> candidatePods;
                        if (nextForwardedPod[0] != null) {
                            candidatePods = new LinkedList<>();
                            candidatePods.add(nextForwardedPod[0]);
                            candidatePods.add(pod);
                        } else {
                            candidatePods = Collections.singletonList(pod);
                        }
                        Pod newPod = getNewestPod(candidatePods); // may be null
                        if (!podEquals(nextForwardedPod[0], newPod)) {
                            nextForwardedPod[0] = newPod;
                            podChanged.signal();
                        }
                    } finally {
                        monitor.unlock();
                    }
                }

                @Override
                public void onClose(KubernetesClientException e) {
                    // don't care
                }
            });

    forwarderThread.start();

    final Closeable handle = new Closeable() {
        @Override
        public void close() throws IOException {
            try {
                watch.close();
            } catch (Exception e) {
            }
            try {
                forwarderThread.interrupt();
                forwarderThread.join(15000);
            } catch (Exception e) {
            }
        }
    };
    Runtime.getRuntime().addShutdownHook(new Thread() {
        @Override
        public void run() {
            try {
                handle.close();
            } catch (Exception e) {
                // suppress
            }
        }
    });

    return handle;
}

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From source file:net.sf.jasperreports.web.servlets.AsyncJasperPrintAccessor.java

/**
 * Create a report accessor./*w w  w .  ja  v a2  s  . c om*/
 * 
 * @param fillHandle the asynchronous fill handle used by this accessor
 */
public AsyncJasperPrintAccessor(FillHandle fillHandle) {
    this.fillHandle = fillHandle;
    lock = new ReentrantLock(true);
    pageCondition = lock.newCondition();

    fillHandle.addListener(this);
    fillHandle.addFillListener(this);
}

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