Added initial version of RequestReplyTemplate (INT-86).

spring-integration-core/src/test/java/org/springframework/integration/channel/RequestReplyTemplateTests.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2002-2007 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.integration.channel;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.Test;
+
+import org.springframework.integration.bus.MessageBus;
+import org.springframework.integration.handler.MessageHandler;
+import org.springframework.integration.handler.ReplyHandler;
+import org.springframework.integration.message.Message;
+import org.springframework.integration.message.MessageHeader;
+import org.springframework.integration.message.StringMessage;
+import org.springframework.integration.scheduling.Subscription;
+
+/**
+ * @author Mark Fisher
+ */
+public class RequestReplyTemplateTests {
+
+	private final SimpleChannel requestChannel = new SimpleChannel();
+
+
+	public RequestReplyTemplateTests() {
+		MessageHandler testHandler = new MessageHandler() {
+			public Message<?> handle(Message<?> message) {
+				return new StringMessage(message.getPayload().toString().toUpperCase());
+			}		
+		};
+		MessageBus bus = new MessageBus();
+		bus.registerChannel("requestChannel", requestChannel);
+		bus.registerHandler("testHandler", testHandler, new Subscription(requestChannel));
+		bus.start();
+	}
+
+
+	@Test
+	public void testSynchronousRequestReply() {
+		RequestReplyTemplate template = new RequestReplyTemplate(requestChannel);
+		Message<?> reply = template.request(new StringMessage("test"));
+		assertEquals("TEST", reply.getPayload());
+	}
+
+	@Test
+	public void testAsynchronousRequestAndReply() throws InterruptedException {
+		final List<String> replies = new ArrayList<String>(3);
+		final CountDownLatch latch = new CountDownLatch(3);
+		ReplyHandler replyHandler = new ReplyHandler() {
+			public void handle(Message<?> replyMessage, MessageHeader originalMessageHeader) {
+				replies.add((String) replyMessage.getPayload());
+				latch.countDown();
+			}
+		};
+		RequestReplyTemplate template = new RequestReplyTemplate(requestChannel);
+		template.request(new StringMessage("test1"), replyHandler);
+		template.request(new StringMessage("test2"), replyHandler);
+		template.request(new StringMessage("test3"), replyHandler);
+		latch.await(1000, TimeUnit.MILLISECONDS);
+		assertEquals(0, latch.getCount());
+		assertTrue(replies.contains("TEST1"));
+		assertTrue(replies.contains("TEST2"));
+		assertTrue(replies.contains("TEST3"));
+	}
+
+}