/*
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 6602600
* @run main/othervm -Xmx8m BasicCancelTest
* @summary Check effectiveness of RemoveOnCancelPolicy
*/
import java.util.concurrent.*;
import java.util.Random;
/**
* Simple timer cancellation test. Submits tasks to a scheduled executor
* service and immediately cancels them.
*/
public class BasicCancelTest {
void checkShutdown(final ExecutorService es) {
final Runnable nop = new Runnable() {public void run() {}};
try {
if (new Random().nextBoolean()) {
check(es.isShutdown());
if (es instanceof ThreadPoolExecutor)
check(((ThreadPoolExecutor) es).isTerminating()
|| es.isTerminated());
THROWS(RejectedExecutionException.class,
new F(){void f(){es.execute(nop);}});
}
} catch (Throwable t) { unexpected(t); }
}
void checkTerminated(final ThreadPoolExecutor tpe) {
try {
checkShutdown(tpe);
check(tpe.getQueue().isEmpty());
check(tpe.isTerminated());
check(! tpe.isTerminating());
equal(tpe.getActiveCount(), 0);
equal(tpe.getPoolSize(), 0);
equal(tpe.getTaskCount(), tpe.getCompletedTaskCount());
check(tpe.awaitTermination(0, TimeUnit.SECONDS));
} catch (Throwable t) { unexpected(t); }
}
void test(String[] args) throws Throwable {
final ScheduledThreadPoolExecutor pool =
new ScheduledThreadPoolExecutor(1);
// Needed to avoid OOME
pool.setRemoveOnCancelPolicy(true);
final long moreThanYouCanChew = Runtime.getRuntime().freeMemory() / 4;
System.out.printf("moreThanYouCanChew=%d%n", moreThanYouCanChew);
Runnable noopTask = new Runnable() { public void run() {}};
for (long i = 0; i < moreThanYouCanChew; i++)
pool.schedule(noopTask, 10, TimeUnit.MINUTES).cancel(true);
pool.shutdown();
check(pool.awaitTermination(1L, TimeUnit.DAYS));
checkTerminated(pool);
equal(pool.getTaskCount(), 0L);
equal(pool.getCompletedTaskCount(), 0L);
}
//--------------------- Infrastructure ---------------------------
volatile int passed = 0, failed = 0;
void pass() {passed++;}
void fail() {failed++; Thread.dumpStack();}
void fail(String msg) {System.err.println(msg); fail();}
void unexpected(Throwable t) {failed++; t.printStackTrace();}
void check(boolean cond) {if (cond) pass(); else fail();}
void equal(Object x, Object y) {
if (x == null ? y == null : x.equals(y)) pass();
else fail(x + " not equal to " + y);}
public static void main(String[] args) throws Throwable {
new BasicCancelTest().instanceMain(args);}
void instanceMain(String[] args) throws Throwable {
try {test(args);} catch (Throwable t) {unexpected(t);}
System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
if (failed > 0) throw new AssertionError("Some tests failed");}
abstract class F {abstract void f() throws Throwable;}
void THROWS(Class<? extends Throwable> k, F... fs) {
for (F f : fs)
try {f.f(); fail("Expected " + k.getName() + " not thrown");}
catch (Throwable t) {
if (k.isAssignableFrom(t.getClass())) pass();
else unexpected(t);}}
}