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/*
* Copyright (C) 2011 The Guava Authors
*
* 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 com.google.common.util.concurrent;
import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static junit.framework.Assert.fail;
import com.google.common.testing.TearDown;
import com.google.common.testing.TearDownAccepter;
import java.util.concurrent.TimeUnit;
import java.util.logging.Logger;
/**
* Utilities for performing thread interruption in tests
*
* @author Kevin Bourrillion
* @author Chris Povirk
*/
final class InterruptionUtil {
private static final Logger logger =
Logger.getLogger(InterruptionUtil.class.getName());
/**
* Runnable which will interrupt the target thread repeatedly when run.
*/
private static final class Interruptenator implements Runnable {
private final long everyMillis;
private final Thread interruptee;
private volatile boolean shouldStop = false;
Interruptenator(Thread interruptee, long everyMillis) {
this.everyMillis = everyMillis;
this.interruptee = interruptee;
}
@Override
public void run() {
while (true) {
try {
Thread.sleep(everyMillis);
} catch (InterruptedException e) {
// ok. just stop sleeping.
}
if (shouldStop) {
break;
}
interruptee.interrupt();
}
}
void stopInterrupting() {
shouldStop = true;
}
}
/**
* Interrupts the current thread after sleeping for the specified delay.
*/
static void requestInterruptIn(final long time, final TimeUnit unit) {
checkNotNull(unit);
final Thread interruptee = Thread.currentThread();
new Thread(new Runnable() {
@Override
public void run() {
try {
unit.sleep(time);
} catch (InterruptedException wontHappen) {
throw new AssertionError(wontHappen);
}
interruptee.interrupt();
}
}).start();
}
static void repeatedlyInterruptTestThread(
long interruptPeriodMillis, TearDownAccepter tearDownAccepter) {
final Interruptenator interruptingTask =
new Interruptenator(Thread.currentThread(), interruptPeriodMillis);
final Thread interruptingThread = new Thread(interruptingTask);
interruptingThread.start();
tearDownAccepter.addTearDown(new TearDown() {
@Override public void tearDown() throws Exception {
interruptingTask.stopInterrupting();
interruptingThread.interrupt();
joinUninterruptibly(interruptingThread, 2500, MILLISECONDS);
Thread.interrupted();
if (interruptingThread.isAlive()) {
// This will be hidden by test-output redirection:
logger.severe(
"InterruptenatorTask did not exit; future tests may be affected");
/*
* This won't do any good under JUnit 3, but I'll leave it around in
* case we ever switch to JUnit 4:
*/
fail();
}
}
});
}
// TODO(cpovirk): promote to Uninterruptibles, and add untimed version
private static void joinUninterruptibly(
Thread thread, long timeout, TimeUnit unit) {
boolean interrupted = false;
try {
long remainingNanos = unit.toNanos(timeout);
long end = System.nanoTime() + remainingNanos;
while (true) {
try {
// TimeUnit.timedJoin() treats negative timeouts just like zero.
NANOSECONDS.timedJoin(thread, remainingNanos);
return;
} catch (InterruptedException e) {
interrupted = true;
remainingNanos = end - System.nanoTime();
}
}
} finally {
if (interrupted) {
Thread.currentThread().interrupt();
}
}
}
}
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