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/*
* Copyright (C) 2007 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.eventbus;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.testing.EqualsTester;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import junit.framework.TestCase;
/**
* Tests for {@link Subscriber}.
*
* @author Cliff Biffle
* @author Colin Decker
*/
public class SubscriberTest extends TestCase {
private static final Object FIXTURE_ARGUMENT = new Object();
private EventBus bus;
private boolean methodCalled;
private Object methodArgument;
@Override
protected void setUp() throws Exception {
bus = new EventBus();
methodCalled = false;
methodArgument = null;
}
public void testCreate() {
Subscriber s1 = Subscriber.create(bus, this, getTestSubscriberMethod("recordingMethod"));
assertThat(s1).isInstanceOf(Subscriber.SynchronizedSubscriber.class);
// a thread-safe method should not create a synchronized subscriber
Subscriber s2 = Subscriber.create(bus, this, getTestSubscriberMethod("threadSafeMethod"));
assertThat(s2).isNotInstanceOf(Subscriber.SynchronizedSubscriber.class);
}
public void testInvokeSubscriberMethod_basicMethodCall() throws Throwable {
Method method = getTestSubscriberMethod("recordingMethod");
Subscriber subscriber = Subscriber.create(bus, this, method);
subscriber.invokeSubscriberMethod(FIXTURE_ARGUMENT);
assertTrue("Subscriber must call provided method", methodCalled);
assertTrue(
"Subscriber argument must be exactly the provided object.",
methodArgument == FIXTURE_ARGUMENT);
}
public void testInvokeSubscriberMethod_exceptionWrapping() throws Throwable {
Method method = getTestSubscriberMethod("exceptionThrowingMethod");
Subscriber subscriber = Subscriber.create(bus, this, method);
try {
subscriber.invokeSubscriberMethod(FIXTURE_ARGUMENT);
fail("Subscribers whose methods throw must throw InvocationTargetException");
} catch (InvocationTargetException expected) {
assertThat(expected).hasCauseThat().isInstanceOf(IntentionalException.class);
}
}
public void testInvokeSubscriberMethod_errorPassthrough() throws Throwable {
Method method = getTestSubscriberMethod("errorThrowingMethod");
Subscriber subscriber = Subscriber.create(bus, this, method);
try {
subscriber.invokeSubscriberMethod(FIXTURE_ARGUMENT);
fail("Subscribers whose methods throw Errors must rethrow them");
} catch (JudgmentError expected) {
}
}
public void testEquals() throws Exception {
Method charAt = String.class.getMethod("charAt", int.class);
Method concat = String.class.getMethod("concat", String.class);
new EqualsTester()
.addEqualityGroup(
Subscriber.create(bus, "foo", charAt), Subscriber.create(bus, "foo", charAt))
.addEqualityGroup(Subscriber.create(bus, "bar", charAt))
.addEqualityGroup(Subscriber.create(bus, "foo", concat))
.testEquals();
}
private Method getTestSubscriberMethod(String name) {
try {
return getClass().getDeclaredMethod(name, Object.class);
} catch (NoSuchMethodException e) {
throw new AssertionError();
}
}
/**
* Records the provided object in {@link #methodArgument} and sets {@link #methodCalled}. This
* method is called reflectively by Subscriber during tests, and must remain public.
*
* @param arg argument to record.
*/
@Subscribe
public void recordingMethod(Object arg) {
assertFalse(methodCalled);
methodCalled = true;
methodArgument = arg;
}
@Subscribe
public void exceptionThrowingMethod(Object arg) throws Exception {
throw new IntentionalException();
}
/** Local exception subclass to check variety of exception thrown. */
class IntentionalException extends Exception {
private static final long serialVersionUID = -2500191180248181379L;
}
@Subscribe
public void errorThrowingMethod(Object arg) {
throw new JudgmentError();
}
@Subscribe
@AllowConcurrentEvents
public void threadSafeMethod(Object arg) {}
/** Local Error subclass to check variety of error thrown. */
class JudgmentError extends Error {
private static final long serialVersionUID = 634248373797713373L;
}
}
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