/*
* Copyright 2002-2016 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.message;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import org.springframework.messaging.Message;
/**
* Factory for handler beans that are useful for testing.
*
* @author Mark Fisher
*/
@SuppressWarnings("unused")
public abstract class TestHandlers {
/**
* Create a handler that always returns null.
*/
public final static Object nullHandler() {
return new Object() {
public Message<?> handle(Message<?> message) {
return null;
}
};
}
/**
* Create a handler that simply returns the {@link Message} it receives.
*/
public final static Object echoHandler() {
return new Object() {
public Message<?> handle(Message<?> message) {
return message;
}
};
}
/**
* Create a handler that increments the provided counter.
*/
public final static Object countingHandler(final AtomicInteger counter) {
return new Object() {
public Message<?> handle(Message<?> message) {
counter.incrementAndGet();
return null;
}
};
}
/**
* Create a handler that counts down on the provided latch.
*/
public final static Object countDownHandler(final CountDownLatch latch) {
return new Object() {
public Message<?> handle(Message<?> message) {
latch.countDown();
return null;
}
};
}
/**
* Create a handler that counts down on the provided latch
* and also increments the provided counter.
*/
public final static Object countingCountDownHandler(final AtomicInteger counter, final CountDownLatch latch) {
return new Object() {
public Message<?> handle(Message<?> message) {
counter.incrementAndGet();
latch.countDown();
return null;
}
};
}
}