Examples of com.google.common.util.concurrent.Monitor$Guard

com.google.common.util.concurrent.Monitor

A boolean condition for which a thread may wait. A {@code Guard} is associated with a single{@code Monitor}.

An implementation of this interface must ensure the following:

Calling {@code isSatisfied()} must be thread-safe with its monitor occupied, because themonitor may check the guard at arbitrary times from a thread occupying the monitor.
Calling {@code isSatisfied()} must not itself have the effect of altering the return valueof this or any other guard's {@code isSatisfied()} method.
No thread that is not occupying the monitor may cause the value returned by {@code isSatisfied()} to change from true to false.
If any thread that is not occupying the monitor causes the value returned by {@code isSatisfied()} to change from false to true, {@link Monitor#reevaluateGuards()} must be calledin order to notify any waiting threads.

If a {@code Guard} is passed into any method of a {@code Monitor} other than the one it isassociated with, an {@link IllegalMonitorStateException} is thrown. @since Guava release 10

        stringLocks = CacheBuilder.newBuilder().build(new LockCacheLoader());
    }




    public void lock(Object name) {
        Monitor lock;
        synchronized (stringLocks) {
            lock = stringLocks.getUnchecked(name);
        }
        lock.enter();
    }

        }
        lock.enter();
    }


    public void unlock(Object name) {
        Monitor lock;
        synchronized (stringLocks) {
            lock = stringLocks.getUnchecked(name);
        }
        lock.leave();
    }

        }
        lock.leave();
    }


    public boolean tryLock(Object name) {
        Monitor lock;
        synchronized (stringLocks) {
            lock = stringLocks.getUnchecked(name);
        }
        return lock.tryEnter();
    }

     * A simple Guava cache loader implementation for generating object-based locks
     */
    private static class LockCacheLoader extends CacheLoader<Object,Monitor> {
        @Override
        public Monitor load(Object key) throws Exception {
            return new Monitor();
        }

Examples of com.google.common.util.concurrent.Monitor$Guard

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