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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.devtools.build.lib.shell;
import static com.google.common.truth.Truth.assertWithMessage;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests of the interaction of Thread.interrupt and Command.execute.
*
* Read http://www.ibm.com/developerworks/java/library/j-jtp05236/
* for background material.
*
* NOTE: This test is dependent on thread timings. Under extreme machine load
* it's possible that this test could fail spuriously or intermittently. In
* that case, adjust the timing constants to increase the tolerance.
*/
@RunWith(JUnit4.class)
public class InterruptibleTest {
private final Thread mainThread = Thread.currentThread();
// Interrupt main thread after 1 second. Hopefully by then /bin/sleep
// should be running.
private final Thread interrupter = new Thread() {
@Override
public void run() {
try {
Thread.sleep(1000); // 1 sec
} catch (InterruptedException e) {
throw new IllegalStateException("Unexpected interrupt!");
}
mainThread.interrupt();
}
};
private Command command;
@Before
public final void startInterrupter() throws Exception {
Thread.interrupted(); // side effect: clear interrupted status
assertWithMessage("Unexpected interruption!").that(mainThread.isInterrupted()).isFalse();
// We interrupt after 1 sec, so this gives us plenty of time for the library to notice the
// subprocess exit.
this.command = new Command(new String[] { "/bin/sleep", "20" });
interrupter.start();
}
@After
public final void waitForInterrupter() throws Exception {
interrupter.join();
Thread.interrupted(); // Clear interrupted status, or else other tests may fail.
}
/**
* Test that interrupting a thread in an "uninterruptible" Command.execute
* preserves the thread's interruptible status, and does not terminate the
* subprocess.
*/
@Test
public void testUninterruptibleCommandRunsToCompletion() throws Exception {
command.execute();
// The interrupter thread should have exited about 1000ms ago.
assertWithMessage("Interrupter thread is still alive!").that(interrupter.isAlive()).isFalse();
// The interrupter thread should have set the main thread's interrupt flag.
assertWithMessage("Main thread was not interrupted during command execution!")
.that(mainThread.isInterrupted())
.isTrue();
}
}
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