Example usage for java.lang Thread holdsLock

Introduction

In this page you can find the example usage for java.lang Thread holdsLock.

Prototype

public static native boolean holdsLock(Object obj);

Source Link

Document

Returns true if and only if the current thread holds the monitor lock on the specified object.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    Object o = new Object();

    System.out.println(Thread.holdsLock(o));
    synchronized (o) {
        System.out.println(Thread.holdsLock(o));
    }//from   w  w  w. j a va2 s. co m
}

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From source file:Main.java

/**
 * Wait on the given object for the specified number of milliseconds.
 * This method will return the actual amount of time that was waited.
 * The current thread must hold the lock on the given object. 
 *///from ww w.j a  v  a2 s . co m
public static long wait(Object o, long timeout) {
    long start = System.currentTimeMillis();
    if (Thread.holdsLock(o)) {
        try {
            o.wait(timeout);
        } catch (InterruptedException e) {
        }
    }
    return System.currentTimeMillis() - start;
}

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From source file:Main.java

/**
 * Wait on the given object indefinitely. This method will return false
 * if an error occured while waiting. The current thread must hold the 
 * lock on the given object. /*from  w  w  w.j  av a 2  s.  c  o  m*/
 */
public static boolean wait(Object o) {
    if (Thread.holdsLock(o)) {
        try {
            o.wait();
            return true;
        } catch (InterruptedException e) {
            return false;
        }
    }
    return false;
}

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From source file:ThreadDemo.java

public void run() {

    System.out.println("Holds Lock = " + Thread.holdsLock(this));

    synchronized (this) {
        System.out.println("Holds Lock = " + Thread.holdsLock(this));
    }//  w  w w .j a va2  s. c  o  m
}

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From source file:Main.java

private static boolean isKnownRoot(X509Certificate root) throws NoSuchAlgorithmException, KeyStoreException {
    assert Thread.holdsLock(sLock);

    // Could not find the system key store. Conservatively report false.
    if (sSystemKeyStore == null)
        return false;

    // Check the in-memory cache first; avoid decoding the anchor from disk
    // if it has been seen before.
    Pair<X500Principal, PublicKey> key = new Pair<X500Principal, PublicKey>(root.getSubjectX500Principal(),
            root.getPublicKey());//from w  ww.j  a  v a2  s.c  om

    if (sSystemTrustAnchorCache.contains(key))
        return true;

    // Note: It is not sufficient to call sSystemKeyStore.getCertificiateAlias. If the server
    // supplies a copy of a trust anchor, X509TrustManagerExtensions returns the server's
    // version rather than the system one. getCertificiateAlias will then fail to find an anchor
    // name. This is fixed upstream in https://android-review.googlesource.com/#/c/91605/
    //
    // TODO(davidben): When the change trickles into an Android release, query sSystemKeyStore
    // directly.

    // System trust anchors are stored under a hash of the principal. In case of collisions,
    // a number is appended.
    String hash = hashPrincipal(root.getSubjectX500Principal());
    for (int i = 0; true; i++) {
        String alias = hash + '.' + i;
        if (!new File(sSystemCertificateDirectory, alias).exists())
            break;

        Certificate anchor = sSystemKeyStore.getCertificate("system:" + alias);
        // It is possible for this to return null if the user deleted a trust anchor. In
        // that case, the certificate remains in the system directory but is also added to
        // another file. Continue iterating as there may be further collisions after the
        // deleted anchor.
        if (anchor == null)
            continue;

        if (!(anchor instanceof X509Certificate)) {
            // This should never happen.
            String className = anchor.getClass().getName();
            Log.e(TAG, "Anchor " + alias + " not an X509Certificate: " + className);
            continue;
        }

        // If the subject and public key match, this is a system root.
        X509Certificate anchorX509 = (X509Certificate) anchor;
        if (root.getSubjectX500Principal().equals(anchorX509.getSubjectX500Principal())
                && root.getPublicKey().equals(anchorX509.getPublicKey())) {
            sSystemTrustAnchorCache.add(key);
            return true;
        }
    }

    return false;
}

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From source file:com.chiorichan.event.EventBus.java

/**
 * Calls an event with the given details.<br>
 * This method only synchronizes when the event is not asynchronous.
 * /*w  w  w .  j  ava 2 s.c o m*/
 * @param event
 *            Event details
 */
public void callEvent(Event event) {
    try {
        if (event.isAsynchronous()) {
            if (Thread.holdsLock(this)) {
                throw new IllegalStateException(event.getEventName()
                        + " cannot be triggered asynchronously from inside synchronized code.");
            }
            if (Loader.getConsole().isPrimaryThread()) {
                throw new IllegalStateException(event.getEventName()
                        + " cannot be triggered asynchronously from primary server thread.");
            }
            fireEvent(event);
        } else {
            synchronized (this) {
                fireEvent(event);
            }
        }
    } catch (EventException ex) {

    }
}

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From source file:com.chiorichan.event.EventBus.java

/**
 * Calls an event with the given details.<br>
 * This method only synchronizes when the event is not asynchronous.
 * //  w w w. j  av a 2s.  c  o  m
 * @param event
 *            Event details
 * @throws EventException
 */
public void callEventWithException(Event event) throws EventException {
    if (event.isAsynchronous()) {
        if (Thread.holdsLock(this)) {
            throw new IllegalStateException(event.getEventName()
                    + " cannot be triggered asynchronously from inside synchronized code.");
        }
        if (Loader.getConsole().isPrimaryThread()) {
            throw new IllegalStateException(
                    event.getEventName() + " cannot be triggered asynchronously from primary server thread.");
        }
        fireEvent(event);
    } else {
        synchronized (this) {
            fireEvent(event);
        }
    }
}

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From source file:eu.udig.catalog.jgrass.utils.JGrassCatalogUtilities.java

/**
 * Reload the service, to which the location refers to. This is ment to be used when new maps
 * are added inside a mapset and the catalog doesn't care to see them. So the tree has to be
 * reloaded./*  w w w .j a  v  a2s  .  com*/
 * 
 * @param locationPath the path to the affected location
 * @param monitor the progress monitor
 */
public static void refreshJGrassService(String locationPath, final IProgressMonitor monitor) {

    System.out.println("Lock on locationPath = " + Thread.holdsLock(locationPath));
    synchronized (locationPath) {

        /*
         * if the catalog is active, refresh the location in the catalog window
         */
        ID id = null;
        if (JGrassPlugin.getDefault() != null) {
            File locationFile = new File(locationPath);
            try {
                id = new ID(locationFile.toURI().toURL());
            } catch (MalformedURLException e) {
                e.printStackTrace();
                return;
            }
        } else {
            return;
        }
        /*
         * test code to make the catalog understand that the map should be added
         */
        final ICatalog catalog = CatalogPlugin.getDefault().getLocalCatalog();
        final JGrassService originalJGrassService = catalog.getById(JGrassService.class, id, monitor);

        /*
         * create the same service
         */
        if (originalJGrassService == null)
            return;
        final URL ID = originalJGrassService.getIdentifier();
        Map<String, Serializable> connectionParams = originalJGrassService.getConnectionParams();
        IServiceFactory locator = CatalogPlugin.getDefault().getServiceFactory();
        final List<IService> rereadService = locator.acquire(ID, connectionParams);

        /*
         * replace the service
         */
        if (rereadService.size() > 0) {
            Runnable refreshCatalogRunner = new Runnable() {
                public void run() {
                    final IService newJGrassService = rereadService.get(0);
                    catalog.remove(originalJGrassService);
                    catalog.add(newJGrassService);
                }
            };

            new Thread(refreshCatalogRunner).start();
        }
    }
}

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From source file:com.vmware.aurora.vc.vcservice.VcService.java

private void setService(ServiceContents service, VcConnectionStatusChangeEvent eventType) {
    AuAssert.check(Thread.holdsLock(this));
    /*/*from www. j a  v  a2  s.c  o  m*/
     * Always log an event for an initial attempt: both VcContext is
     * initialized for the first time and this session gets its first life.
     * Otherwise, log an an event only if a service state change has been
     * detected to avoid event storms when VC is persistently down.
     */
    if (eventType != null && ((VcContext.getGenCount() == 1 && curGenCount == 1) || this.service != service)) {
        VcContext.triggerEvent(eventType, serviceName);
    }
    this.service = service;
}

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From source file:it.unibo.alchemist.boundary.monitors.Generic2DDisplay.java

private void update(final Environment<T> env, final Time time) {
    if (Thread.holdsLock(env)) {
        if (envHasMobileObstacles(env)) {
            loadObstacles(env);//from ww  w.  j av  a  2 s  .c o  m
        }
        lasttime = time.toDouble();
        currentEnv = env;
        accessData();
        positions.clear();
        neighbors.clear();
        env.getNodes().parallelStream().forEach(node -> {
            positions.put(node, env.getPosition(node));
            try {
                neighbors.put(node, env.getNeighborhood(node).clone());
            } catch (Exception e) {
                L.error("Unable to clone neighborhood for " + node, e);
            }
        });
        releaseData();
        repaint();
    } else {
        throw new IllegalStateException("Only the simulation thread can dictate GUI updates");
    }
}

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