Examples with ReferenceQueue java.lang.ref.ReferenceQueue used on opensource projects

Example 6 with ReferenceQueue

use of java.lang.ref.ReferenceQueue in project jdk8u_jdk by JetBrains.

the class JpegWriterLeakTest method main.

public static void main(String[] args) {
    final ReferenceQueue<ImageWriter> queue = new ReferenceQueue<>();
    final ArrayList<Reference<? extends ImageWriter>> refs = new ArrayList<>();
    int count = 2;
    do {
        ImageWriter writer = ImageIO.getImageWritersByFormatName("jpeg").next();
        final WeakReference<? extends ImageWriter> ref = new WeakReference<>(writer, queue);
        refs.add(ref);
        try {
            final ImageOutputStream os = ImageIO.createImageOutputStream(new ByteArrayOutputStream());
            writer.setOutput(os);
            writer.write(getImage());
        // NB: dispose() or reset() workarounds the problem.
        } catch (IOException e) {
        } finally {
            writer = null;
        }
        count--;
    } while (count > 0);
    System.out.println("Wait for GC...");
    final long testTimeOut = 60000L;
    final long startTime = System.currentTimeMillis();
    while (!refs.isEmpty()) {
        // check for the test timeout
        final long now = System.currentTimeMillis();
        if (now - startTime > testTimeOut) {
            System.out.println();
            throw new RuntimeException("Test FAILED.");
        }
        System.gc();
        try {
            System.out.print(".");
            Thread.sleep(1000);
        } catch (InterruptedException e) {
        }
        ;
        Reference<? extends ImageWriter> r = queue.poll();
        if (r != null) {
            System.out.println("Got reference: " + r);
            refs.remove(r);
        }
    }
    System.out.println("Test PASSED.");
}

Example 7 with ReferenceQueue

use of java.lang.ref.ReferenceQueue in project jackrabbit by apache.

the class SessionGarbageCollectedTest method testSessionsGetGarbageCollected.

public void testSessionsGetGarbageCollected() throws RepositoryException {
    ArrayList<WeakReference<Session>> list = new ArrayList<WeakReference<Session>>();
    ReferenceQueue<Session> detect = new ReferenceQueue<Session>();
    Error error = null;
    try {
        for (int i = 0; ; i++) {
            Session s = getHelper().getReadWriteSession();
            // eat  a lot of memory so it gets garbage collected quickly
            // (or quickly runs out of memory)
            Node n = s.getRootNode().addNode("n" + i);
            n.setProperty("x", new String(new char[1000000]));
            list.add(new WeakReference<Session>(s, detect));
            if (detect.poll() != null) {
                break;
            }
        }
    } catch (OutOfMemoryError e) {
        error = e;
    }
    for (int i = 0; i < list.size(); i++) {
        Reference<Session> ref = list.get(i);
        Session s = ref.get();
        if (s != null) {
            s.logout();
        }
    }
    if (error != null) {
        throw error;
    }
}

Example 8 with ReferenceQueue

use of java.lang.ref.ReferenceQueue in project robovm by robovm.

the class ReferenceTest method test_isEnqueued.

/**
     * java.lang.ref.Reference#isEnqueued()
     */
public void test_isEnqueued() {
    ReferenceQueue rq = new ReferenceQueue();
    obj = new Object();
    Reference ref = new SoftReference(obj, rq);
    assertTrue("Should start off not enqueued.", !ref.isEnqueued());
    ref.enqueue();
    assertTrue("Should now be enqueued.", ref.isEnqueued());
    ref.enqueue();
    assertTrue("Should still be enqueued.", ref.isEnqueued());
    rq.poll();
    // This fails ...
    assertTrue("Should now be not enqueued.", !ref.isEnqueued());
}

Example 9 with ReferenceQueue

use of java.lang.ref.ReferenceQueue in project robovm by robovm.

the class ReferenceTest method test_get_WeakReference.

public void test_get_WeakReference() throws Exception {
    // Test the general/overall functionality of Reference.
    ReferenceQueue<Object> queue = new ReferenceQueue<Object>();
    r = newWeakReference(queue);
    FinalizationTester.induceFinalization();
    // RoboVM note: Don't wait indefinitely.
    Reference ref = queue.remove(10 * 1000);
    assertNotNull("Object not enqueued.", ref);
    assertSame("Unexpected ref1", ref, r);
    assertNull("Object could not be reclaimed1.", r.get());
    r = newWeakReference(queue);
    FinalizationTester.induceFinalization();
    // wait for the reference queue thread to enqueue the newly-finalized object
    Thread.yield();
    Thread.sleep(200);
    ref = queue.poll();
    assertNotNull("Object not enqueued.", ref);
    assertSame("Unexpected ref2", ref, r);
    assertNull("Object could not be reclaimed.", ref.get());
    assertNull("Object could not be reclaimed.", r.get());
}

Example 10 with ReferenceQueue

use of java.lang.ref.ReferenceQueue in project robovm by robovm.

the class SoftReferenceTest method test_ConstructorLjava_lang_ObjectLjava_lang_ref_ReferenceQueue.

/**
     * java.lang.ref.SoftReference#SoftReference(java.lang.Object,
     *        java.lang.ref.ReferenceQueue)
     */
public void test_ConstructorLjava_lang_ObjectLjava_lang_ref_ReferenceQueue() {
    ReferenceQueue rq = new ReferenceQueue();
    bool = new Boolean(true);
    try {
        SoftReference sr = new SoftReference(bool, rq);
        assertTrue("Initialization failed.", ((Boolean) sr.get()).booleanValue());
    } catch (Exception e) {
        fail("Exception during test : " + e.getMessage());
    }
    boolean exception = false;
    try {
        new SoftReference(bool, null);
    } catch (NullPointerException e) {
        exception = true;
    }
    assertTrue("Should not throw NullPointerException", !exception);
}