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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 com.google.common.collect.Lists;
import junit.framework.TestCase;
import java.util.List;
import java.util.concurrent.Executor;
/**
* Test case for {@link AsyncEventBus}.
*
* @author Cliff Biffle
*/
public class AsyncEventBusTest extends TestCase {
private static final String EVENT = "Hello";
/** The executor we use to fake asynchronicity. */
private FakeExecutor executor;
private AsyncEventBus bus;
@Override protected void setUp() throws Exception {
super.setUp();
executor = new FakeExecutor();
bus = new AsyncEventBus(executor);
}
public void testBasicDistribution() {
StringCatcher catcher = new StringCatcher();
bus.register(catcher);
// We post the event, but our Executor will not deliver it until instructed.
bus.post(EVENT);
List<String> events = catcher.getEvents();
assertTrue("No events should be delivered synchronously.",
events.isEmpty());
// Now we find the task in our Executor and explicitly activate it.
List<Runnable> tasks = executor.getTasks();
assertEquals("One event dispatch task should be queued.", 1, tasks.size());
tasks.get(0).run();
assertEquals("One event should be delivered.", 1, events.size());
assertEquals("Correct string should be delivered.", EVENT, events.get(0));
}
/**
* An {@link Executor} wanna-be that simply records the tasks it's given.
* Arguably the Worst Executor Ever.
*
* @author cbiffle
*
*/
public static class FakeExecutor implements Executor {
List<Runnable> tasks = Lists.newArrayList();
@Override
public void execute(Runnable task) {
tasks.add(task);
}
public List<Runnable> getTasks() {
return tasks;
}
}
}
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