/*
* Copyright (C) 2015 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 java.net.URLClassLoader;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Future;
import junit.framework.TestCase;
/**
* Tests for {@link AbstractFuture} with the cancellation cause system property set
*/
public class AbstractFutureCancellationCauseTest extends TestCase {
private ClassLoader oldClassLoader;
private URLClassLoader classReloader;
@Override protected void setUp() throws Exception {
// Load the "normal" copy of SettableFuture and related classes.
SettableFuture<?> unused = SettableFuture.create();
// Hack to load AbstractFuture et. al. in a new classloader so that it re-reads the cancellation
// cause system property. This allows us to run with both settings of the property in one jvm
// without resorting to even crazier hacks to reset static final boolean fields.
System.setProperty("guava.concurrent.generate_cancellation_cause", "true");
final String concurrentPackage = SettableFuture.class.getPackage().getName();
classReloader =
new URLClassLoader(((URLClassLoader) SettableFuture.class.getClassLoader()).getURLs()) {
@Override public Class<?> loadClass(String name) throws ClassNotFoundException {
if (name.startsWith(concurrentPackage)) {
return super.findClass(name);
}
return super.loadClass(name);
}
};
oldClassLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(classReloader);
}
@Override
protected void tearDown() throws Exception {
classReloader.close();
Thread.currentThread().setContextClassLoader(oldClassLoader);
System.clearProperty("guava.concurrent.generate_cancellation_cause");
}
public void testCancel_notDoneNoInterrupt() throws Exception {
Future<?> future = newFutureInstance();
assertTrue(future.cancel(false));
assertTrue(future.isCancelled());
assertTrue(future.isDone());
try {
future.get();
fail("Expected CancellationException");
} catch (CancellationException e) {
assertNotNull(e.getCause());
}
}
public void testCancel_notDoneInterrupt() throws Exception {
Future<?> future = newFutureInstance();
assertTrue(future.cancel(true));
assertTrue(future.isCancelled());
assertTrue(future.isDone());
try {
future.get();
fail("Expected CancellationException");
} catch (CancellationException e) {
assertNotNull(e.getCause());
}
}
private Future<?> newFutureInstance() throws Exception {
return (Future<?>)
classReloader.loadClass(SettableFuture.class.getName()).getMethod("create").invoke(null);
}
}