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/*
* Copyright (C) 2011 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package libcore.java.lang.ref;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
public final class FinalizeTest extends TestCase {
public void testFinalizeIsCalled() throws Exception {
AtomicBoolean finalized = new AtomicBoolean();
createFinalizableObject(finalized);
FinalizationTester.induceFinalization();
if (!finalized.get()) {
fail("object not yet finalized");
}
}
/**
* Test verifies that runFinalization() does not mess up objects
* that should be finalized later on. http://b/6907299
*/
public void testInducedFinalization() throws Exception {
AtomicBoolean finalized1 = new AtomicBoolean();
AtomicBoolean finalized2 = new AtomicBoolean();
createFinalizableObject(finalized1);
createFinalizableObject(finalized2);
FinalizationTester.induceFinalization();
if (!finalized1.get() || !finalized2.get()) {
fail("not yet finalized: " + finalized1.get() + " " + finalized2.get());
}
}
/** Do not inline this method; that could break non-precise GCs. See FinalizationTester. */
private X createFinalizableObject(final AtomicBoolean finalized) {
X result = new X() {
@Override protected void finalize() throws Throwable {
super.finalize();
finalized.set(true);
}
};
FinalizationTester.induceFinalization();
// Dance around a bit to discourage dx from realizing that 'result' is no longer live.
boolean wasFinalized = finalized.get();
if (wasFinalized) {
fail("finalizer called early"); // ...because 'result' is still live until we return.
}
// But we don't actually want to return 'result' because then we'd have to worry about
// the caller accidentally keeping it live.
return wasFinalized ? result : null;
}
static class X {}
// http://b/issue?id=2136462
public void testBackFromTheDead() throws Exception {
try {
new ConstructionFails();
} catch (AssertionError expected) {
}
FinalizationTester.induceFinalization();
assertTrue("object whose constructor threw was not finalized", ConstructionFails.finalized);
}
static class ConstructionFails {
private static boolean finalized;
ConstructionFails() {
throw new AssertionError();
}
@Override protected void finalize() throws Throwable {
finalized = true;
}
}
/**
* The finalizer watch dog exits the VM if any object takes more than 10 s
* to finalize. Check that objects near that limit are okay.
*/
public void testWatchdogDoesNotFailForObjectsThatAreNearTheDeadline() throws Exception {
CountDownLatch latch = new CountDownLatch(5);
createSlowFinalizer( 1, latch);
createSlowFinalizer(1000, latch);
createSlowFinalizer(2000, latch);
createSlowFinalizer(4000, latch);
createSlowFinalizer(8000, latch);
FinalizationTester.induceFinalization();
latch.await();
}
public void createSlowFinalizer(final long millis, final CountDownLatch latch) {
new Object() {
@Override protected void finalize() throws Throwable {
System.out.println("finalize sleeping " + millis + " ms");
Thread.sleep(millis);
latch.countDown();
}
};
}
/**
* Make sure that System.runFinalization() returns even if the finalization
* queue is never completely empty. http://b/4193517
*/
public void testSystemRunFinalizationReturnsEvenIfQueueIsNonEmpty() throws Exception {
AtomicInteger count = new AtomicInteger();
AtomicBoolean keepGoing = new AtomicBoolean(true);
createChainedFinalizer(count, keepGoing);
FinalizationTester.induceFinalization();
keepGoing.set(false);
assertTrue(count.get() > 0);
}
public void createChainedFinalizer(final AtomicInteger counter, final AtomicBoolean keepGoing) {
new Object() {
@Override protected void finalize() throws Throwable {
int count = counter.incrementAndGet();
System.out.println(count);
if (keepGoing.get()) {
createChainedFinalizer(counter, keepGoing); // recursive!
}
System.gc();
FinalizationTester.enqueueReferences();
}
};
}
}
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