Added an implementation of MessageHandler for routing messages. Supports either ChannelResolver or ChannelNameResolver strategy.

spring-integration-core/src/test/java/org/springframework/integration/router/RoutingMessageHandlerTests.java

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+/*
+ * 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.router;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+
+import org.springframework.integration.MessageHandlingException;
+import org.springframework.integration.MessagingConfigurationException;
+import org.springframework.integration.channel.ChannelRegistry;
+import org.springframework.integration.channel.DefaultChannelRegistry;
+import org.springframework.integration.channel.MessageChannel;
+import org.springframework.integration.channel.PointToPointChannel;
+import org.springframework.integration.message.Message;
+import org.springframework.integration.message.StringMessage;
+
+/**
+ * @author Mark Fisher
+ */
+public class RoutingMessageHandlerTests {
+
+	@Test
+	public void testRoutingWithChannelResolver() {
+		final PointToPointChannel channel = new PointToPointChannel();
+		ChannelResolver channelResolver = new ChannelResolver() {
+			public MessageChannel resolve(Message<?> message) {
+				return channel;
+			}
+		};
+		RoutingMessageHandler router = new RoutingMessageHandler();
+		router.setChannelResolver(channelResolver);
+		router.afterPropertiesSet();
+		Message<String> message = new StringMessage("123", "test");
+		router.handle(message);
+		Message<?> result = channel.receive(25);
+		assertNotNull(result);
+		assertEquals("test", result.getPayload());
+	}
+
+	@Test
+	public void testRoutingWithChannelNameResolver() {
+		ChannelNameResolver channelNameResolver = new ChannelNameResolver() {
+			public String resolve(Message<?> message) {
+				return "testChannel";
+			}
+		};
+		PointToPointChannel channel = new PointToPointChannel();
+		ChannelRegistry channelRegistry = new DefaultChannelRegistry();
+		channelRegistry.registerChannel("testChannel", channel);
+		RoutingMessageHandler router = new RoutingMessageHandler();
+		router.setChannelNameResolver(channelNameResolver);
+		router.setChannelRegistry(channelRegistry);
+		router.afterPropertiesSet();
+		Message<String> message = new StringMessage("123", "test");
+		router.handle(message);
+		Message<?> result = channel.receive(25);
+		assertNotNull(result);
+		assertEquals("test", result.getPayload());
+	}
+
+	@Test(expected=MessagingConfigurationException.class)
+	public void testConfiguringBothChannelResolverAndChannelNameResolverIsNotAllowed() {
+		ChannelResolver channelResolver = new ChannelResolver() {
+			public MessageChannel resolve(Message<?> message) {
+				return new PointToPointChannel();
+			}
+		};
+		ChannelNameResolver channelNameResolver = new ChannelNameResolver() {
+			public String resolve(Message<?> message) {
+				return "";
+			}
+		};
+		RoutingMessageHandler router = new RoutingMessageHandler();
+		router.setChannelResolver(channelResolver);		
+		router.setChannelNameResolver(channelNameResolver);
+		router.afterPropertiesSet();
+	}
+
+	@Test(expected=MessageHandlingException.class)
+	public void testChannelResolutionFailure() {
+		ChannelResolver channelResolver = new ChannelResolver() {
+			public MessageChannel resolve(Message<?> message) {
+				return null;
+			}
+		};
+		RoutingMessageHandler router = new RoutingMessageHandler();
+		router.setChannelResolver(channelResolver);
+		router.afterPropertiesSet();
+		Message<String> message = new StringMessage("123", "test");
+		router.handle(message);
+	}
+
+	@Test(expected=MessageHandlingException.class)
+	public void testChannelNameResolutionFailure() {
+		ChannelNameResolver channelNameResolver = new ChannelNameResolver() {
+			public String resolve(Message<?> message) {
+				return "noSuchChannel";
+			}
+		};
+		PointToPointChannel channel = new PointToPointChannel();
+		ChannelRegistry channelRegistry = new DefaultChannelRegistry();
+		channelRegistry.registerChannel("testChannel", channel);
+		RoutingMessageHandler router = new RoutingMessageHandler();
+		router.setChannelNameResolver(channelNameResolver);
+		router.setChannelRegistry(channelRegistry);
+		router.afterPropertiesSet();
+		Message<String> message = new StringMessage("123", "test");
+		router.handle(message);
+	}
+
+}