Examples of java.util.concurrent.locks.Lock.lock()

java.util.concurrent.locks.Lock.lock()
Acquires the lock.
If the lock is not available then the current thread becomes disabled for thread scheduling purposes and lies dormant until the lock has been acquired.
Implementation Considerations
A {@code Lock} implementation may be able to detect erroneous useof the lock, such as an invocation that would cause deadlock, and may throw an (unchecked) exception in such circumstances. The circumstances and the exception type must be documented by that {@code Lock} implementation.

     * Container (if any); otherwise return <code>null</code>.
     */
    @Override
    public Cluster getCluster() {
        Lock readLock = clusterLock.readLock();
        readLock.lock();
        try {
            if (cluster != null)
                return cluster;


            if (parent != null)

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    /*
     * Provide access to just the cluster component attached to this container.
     */
    protected Cluster getClusterInternal() {
        Lock readLock = clusterLock.readLock();
        readLock.lock();
        try {
            return cluster;
        } finally {
            readLock.unlock();
        }

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    @Override
    public void setCluster(Cluster cluster) {


        Cluster oldCluster = null;
        Lock writeLock = clusterLock.writeLock();
        writeLock.lock();
        try {
            // Change components if necessary
            oldCluster = this.cluster;
            if (oldCluster == cluster)
                return;

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    @Override
    public Realm getRealm() {


        Lock l = realmLock.readLock();
        try {
            l.lock();
            if (realm != null)
                return (realm);
            if (parent != null)
                return (parent.getRealm());
            return null;

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    protected Realm getRealmInternal() {
        Lock l = realmLock.readLock();
        try {
            l.lock();
            return realm;
        } finally {
            l.unlock();
        }
    }

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    public void setRealm(Realm realm) {


        Lock l = realmLock.writeLock();


        try {
            l.lock();


            // Change components if necessary
            Realm oldRealm = this.realm;
            if (oldRealm == realm)
                return;

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    @Override
    public Loader getLoader() {
        Lock readLock = loaderLock.readLock();
        readLock.lock();
        try {
            return loader;
        } finally {
            readLock.unlock();
        }

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    @Override
    public void setLoader(Loader loader) {


        Lock writeLock = loaderLock.writeLock();
        writeLock.lock();
        Loader oldLoader = null;
        try {
            // Change components if necessary
            oldLoader = this.loader;
            if (oldLoader == loader)

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    @Override
    public Manager getManager() {
        Lock readLock = managerLock.readLock();
        readLock.lock();
        try {
            return manager;
        } finally {
            readLock.unlock();
        }

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    @Override
    public void setManager(Manager manager) {


        Lock writeLock = managerLock.writeLock();
        writeLock.lock();
        Manager oldManager = null;
        try {
            // Change components if necessary
            oldManager = this.manager;
            if (oldManager == manager)

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