Example usage for com.google.common.testing GcFinalization awaitClear

Introduction

In this page you can find the example usage for com.google.common.testing GcFinalization awaitClear.

Prototype

public static void awaitClear(final WeakReference<?> ref) 

Source Link

Document

Waits until the given weak reference is cleared, invoking the garbage collector as necessary to try to ensure that this will happen.

Usage

From source file:com.google.inject.internal.WeakKeySetUtils.java

public static void awaitClear(WeakReference<?> ref) {
    // GcFinalization *should* do it, but doesn't work well in practice...
    // so we put a second latch and wait for a ReferenceQueue to tell us.
    Object data = ref.get();//  w ww.j  a v a  2  s.c om
    ReferenceQueue<Object> queue = null;
    WeakReference extraRef = null;
    if (data != null) {
        queue = new ReferenceQueue<Object>();
        extraRef = new WeakReference<Object>(data, queue);
        data = null;
    }
    GcFinalization.awaitClear(ref);
    if (queue != null) {
        try {
            assertSame("queue didn't return ref in time", extraRef, queue.remove(5000));
        } catch (IllegalArgumentException e) {
            throw new RuntimeException(e);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }
    }
}

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