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/*
* 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 static com.google.common.truth.Truth.assertThat;
import java.lang.reflect.Method;
import java.net.URLClassLoader;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CancellationException;
import java.util.concurrent.Executor;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import javax.annotation.concurrent.GuardedBy;
import junit.framework.TestCase;
/** Tests for {@link AbstractFuture} with the cancellation cause system property set */
@AndroidIncompatible // custom classloading
public class AbstractFutureCancellationCauseTest extends TestCase {
private ClassLoader oldClassLoader;
private URLClassLoader classReloader;
private Class<?> settableFutureClass;
private Class<?> abstractFutureClass;
@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(ClassPathUtil.getClassPathUrls()) {
@GuardedBy("loadedClasses")
final Map<String, Class<?>> loadedClasses = new HashMap<>();
@Override
public Class<?> loadClass(String name) throws ClassNotFoundException {
if (name.startsWith(concurrentPackage)
// Use other classloader for ListenableFuture, so that the objects can interact
&& !ListenableFuture.class.getName().equals(name)) {
synchronized (loadedClasses) {
Class<?> toReturn = loadedClasses.get(name);
if (toReturn == null) {
toReturn = super.findClass(name);
loadedClasses.put(name, toReturn);
}
return toReturn;
}
}
return super.loadClass(name);
}
};
oldClassLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(classReloader);
abstractFutureClass = classReloader.loadClass(AbstractFuture.class.getName());
settableFutureClass = classReloader.loadClass(SettableFuture.class.getName());
}
@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());
assertNull(tryInternalFastPathGetFailure(future));
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());
assertNull(tryInternalFastPathGetFailure(future));
try {
future.get();
fail("Expected CancellationException");
} catch (CancellationException e) {
assertNotNull(e.getCause());
}
}
public void testSetFuture_misbehavingFutureDoesNotThrow() throws Exception {
ListenableFuture<String> badFuture =
new ListenableFuture<String>() {
@Override
public boolean cancel(boolean interrupt) {
return false;
}
@Override
public boolean isDone() {
return true;
}
@Override
public boolean isCancelled() {
return true; // BAD!!
}
@Override
public String get() {
return "foo"; // BAD!!
}
@Override
public String get(long time, TimeUnit unit) {
return "foo"; // BAD!!
}
@Override
public void addListener(Runnable runnable, Executor executor) {
executor.execute(runnable);
}
};
Future<?> future = newFutureInstance();
future
.getClass()
.getMethod(
"setFuture",
future.getClass().getClassLoader().loadClass(ListenableFuture.class.getName()))
.invoke(future, badFuture);
try {
future.get();
fail();
} catch (CancellationException expected) {
assertThat(expected).hasCauseThat().isInstanceOf(IllegalArgumentException.class);
assertThat(expected).hasCauseThat().hasMessageThat().contains(badFuture.toString());
}
}
private Future<?> newFutureInstance() throws Exception {
return (Future<?>) settableFutureClass.getMethod("create").invoke(null);
}
private Throwable tryInternalFastPathGetFailure(Future<?> future) throws Exception {
Method tryInternalFastPathGetFailureMethod =
abstractFutureClass.getDeclaredMethod("tryInternalFastPathGetFailure");
tryInternalFastPathGetFailureMethod.setAccessible(true);
return (Throwable) tryInternalFastPathGetFailureMethod.invoke(future);
}
}
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