/*
* Copyright 2006-2007 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.batch.integration.item;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.util.Arrays;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemWriter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.integration.annotation.MessageEndpoint;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.annotation.Splitter;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
/**
* Test case showing the use of a MessagingGateway to provide an ItemWriter or
* ItemProcessor to Spring Batch that is hooked directly into a Sprng
* Integration MessageChannel.
*
* @author Dave Syer
*
*/
@ContextConfiguration
@RunWith(SpringJUnit4ClassRunner.class)
public class MessagingGatewayIntegrationTests {
@Autowired
private ItemProcessor<String, String> processor;
@Autowired
private ItemWriter<String> writer;
/**
* Just for the sake of being able to make assertions.
*/
@Autowired
private EndService service;
/**
* Just for the sake of being able to make assertions.
*/
@Autowired
private SplitService splitter;
@Test
public void testProcessor() throws Exception {
String result = processor.process("foo");
assertEquals("foo: 0: 1", result);
assertNull(processor.process("filter"));
}
@Test
public void testWriter() throws Exception {
writer.write(Arrays.asList("foo", "bar", "spam"));
assertEquals(3, splitter.count);
assertEquals(3, service.count);
}
/**
* This service is wrapped into an ItemProcessor and used to transform
* items. This is where the main business processing could take place in a
* real application. To suppress output the service activator can just
* return null (same as an ItemProcessor) but remember to set the reply
* timeout in the gateway.
*
* @author Dave Syer
*
*/
@MessageEndpoint
public static class Activator {
private int count;
@ServiceActivator
public String transform(String input) {
if (input.equals("filter")) {
return null;
}
return input + ": " + (count++);
}
}
/**
* The Splitter is wrapped into an ItemWriter and used to relay items to its
* output channel. This one is completely trivial, it just passes the items
* on as they are. More complex splitters might filter or enhance the items
* before passing them on.
*
* @author Dave Syer
*
*/
@MessageEndpoint
public static class SplitService {
// Just for assertions in the test case
private int count;
@Splitter
public List<String> split(List<String> input) {
count += input.size();
return input;
}
}
/**
* This is just used to trap the messages sent by the ItemWriter and make an
* assertion about them in the the test case. In a real application this
* would be the output stage and/or business processing.
*
* @author Dave Syer
*
*/
@MessageEndpoint
public static class EndService {
private int count;
@ServiceActivator
public void service(String input) {
count++;
return;
}
}
}