/*
* Copyright 2002-2010 the original author or 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 org.springframework.integration.dispatcher;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;
import org.springframework.integration.MessageRejectedException;
import org.springframework.integration.handler.ServiceActivatingHandler;
import org.springframework.messaging.support.GenericMessage;
import org.springframework.integration.message.TestHandlers;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageDeliveryException;
import org.springframework.messaging.MessageHandler;
/**
* @author Mark Fisher
*/
public class FailOverDispatcherTests {
@Test
public void singleMessage() throws InterruptedException {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final CountDownLatch latch = new CountDownLatch(1);
dispatcher.addHandler(createConsumer(TestHandlers.countDownHandler(latch)));
dispatcher.dispatch(new GenericMessage<String>("test"));
latch.await(500, TimeUnit.MILLISECONDS);
assertEquals(0, latch.getCount());
}
@Test
public void pointToPoint() throws InterruptedException {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final CountDownLatch latch = new CountDownLatch(1);
final AtomicInteger counter1 = new AtomicInteger();
final AtomicInteger counter2 = new AtomicInteger();
dispatcher.addHandler(createConsumer(TestHandlers.countingCountDownHandler(counter1, latch)));
dispatcher.addHandler(createConsumer(TestHandlers.countingCountDownHandler(counter2, latch)));
dispatcher.dispatch(new GenericMessage<String>("test"));
latch.await(500, TimeUnit.MILLISECONDS);
assertEquals(0, latch.getCount());
assertEquals("only 1 handler should have received the message", 1, counter1.get() + counter2.get());
}
@Test
public void noDuplicateSubscriptions() {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final AtomicInteger counter = new AtomicInteger();
MessageHandler target = new CountingTestEndpoint(counter, false);
dispatcher.addHandler(target);
dispatcher.addHandler(target);
try {
dispatcher.dispatch(new GenericMessage<String>("test"));
}
catch (Exception e) {
// ignore
}
assertEquals("target should not have duplicate subscriptions", 1, counter.get());
}
@Test
public void removeConsumerBeforeSend() {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final AtomicInteger counter = new AtomicInteger();
MessageHandler target1 = new CountingTestEndpoint(counter, false);
MessageHandler target2 = new CountingTestEndpoint(counter, false);
MessageHandler target3 = new CountingTestEndpoint(counter, false);
dispatcher.addHandler(target1);
dispatcher.addHandler(target2);
dispatcher.addHandler(target3);
dispatcher.removeHandler(target2);
try {
dispatcher.dispatch(new GenericMessage<String>("test"));
}
catch (Exception e) {
// ignore
}
assertEquals(2, counter.get());
}
@Test
public void removeConsumerBetweenSends() {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final AtomicInteger counter = new AtomicInteger();
MessageHandler target1 = new CountingTestEndpoint(counter, false);
MessageHandler target2 = new CountingTestEndpoint(counter, false);
MessageHandler target3 = new CountingTestEndpoint(counter, false);
dispatcher.addHandler(target1);
dispatcher.addHandler(target2);
dispatcher.addHandler(target3);
try {
dispatcher.dispatch(new GenericMessage<String>("test1"));
}
catch (Exception e) {
// ignore
}
assertEquals(3, counter.get());
dispatcher.removeHandler(target2);
try {
dispatcher.dispatch(new GenericMessage<String>("test2"));
}
catch (Exception e) {
// ignore
}
assertEquals(5, counter.get());
dispatcher.removeHandler(target1);
try {
dispatcher.dispatch(new GenericMessage<String>("test3"));
}
catch (Exception e) {
// ignore
}
assertEquals(6, counter.get());
}
@Test(expected = MessageDeliveryException.class)
public void removeConsumerLastTargetCausesDeliveryException() {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final AtomicInteger counter = new AtomicInteger();
MessageHandler target = new CountingTestEndpoint(counter, false);
dispatcher.addHandler(target);
try {
dispatcher.dispatch(new GenericMessage<String>("test1"));
}
catch (Exception e) {
// ignore
}
assertEquals(1, counter.get());
dispatcher.removeHandler(target);
dispatcher.dispatch(new GenericMessage<String>("test2"));
}
@Test
public void firstHandlerReturnsTrue() {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final AtomicInteger counter = new AtomicInteger();
MessageHandler target1 = new CountingTestEndpoint(counter, true);
MessageHandler target2 = new CountingTestEndpoint(counter, false);
MessageHandler target3 = new CountingTestEndpoint(counter, false);
dispatcher.addHandler(target1);
dispatcher.addHandler(target2);
dispatcher.addHandler(target3);
assertTrue(dispatcher.dispatch(new GenericMessage<String>("test")));
assertEquals("only the first target should have been invoked", 1, counter.get());
}
@Test
public void middleHandlerReturnsTrue() {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final AtomicInteger counter = new AtomicInteger();
MessageHandler target1 = new CountingTestEndpoint(counter, false);
MessageHandler target2 = new CountingTestEndpoint(counter, true);
MessageHandler target3 = new CountingTestEndpoint(counter, false);
dispatcher.addHandler(target1);
dispatcher.addHandler(target2);
dispatcher.addHandler(target3);
assertTrue(dispatcher.dispatch(new GenericMessage<String>("test")));
assertEquals("first two targets should have been invoked", 2, counter.get());
}
@Test
public void allHandlersReturnFalse() {
UnicastingDispatcher dispatcher = new UnicastingDispatcher();
final AtomicInteger counter = new AtomicInteger();
MessageHandler target1 = new CountingTestEndpoint(counter, false);
MessageHandler target2 = new CountingTestEndpoint(counter, false);
MessageHandler target3 = new CountingTestEndpoint(counter, false);
dispatcher.addHandler(target1);
dispatcher.addHandler(target2);
dispatcher.addHandler(target3);
try {
assertFalse(dispatcher.dispatch(new GenericMessage<String>("test")));
}
catch (Exception e) {
// ignore
}
assertEquals("each target should have been invoked", 3, counter.get());
}
private static ServiceActivatingHandler createConsumer(Object object) {
return new ServiceActivatingHandler(object);
}
private static class CountingTestEndpoint implements MessageHandler {
private final AtomicInteger counter;
private final boolean shouldAccept;
CountingTestEndpoint(AtomicInteger counter, boolean shouldAccept) {
this.counter = counter;
this.shouldAccept = shouldAccept;
}
public void handleMessage(Message<?> message) {
this.counter.incrementAndGet();
if (!this.shouldAccept) {
throw new MessageRejectedException(message, "intentional test failure");
}
}
}
}