INT-911, Created MessageHandling infrastructure around Gateway so it could be included in the <chain>

org.springframework.integration/src/test/java/org/springframework/integration/gateway/GatewayInvokingMessaheHandlerTests-context.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
+		http://www.springframework.org/schema/integration http://www.springframework.org/schema/integration/spring-integration-2.0.xsd"
+	xmlns:si="http://www.springframework.org/schema/integration">
+	
+	<si:gateway id="simpleGateway"
+				default-request-channel="inputA" 
+				default-reply-channel="inputB"
+				service-interface="org.springframework.integration.gateway.GatewayInvokingMessaheHandlerTests$SimpleGateway"/>
+
+	<si:publish-subscribe-channel id="inputA" />
+	<si:publish-subscribe-channel id="inputB" />
+	<si:publish-subscribe-channel id="inputC" />
+
+	<si:chain input-channel="inputA" output-channel="inputB">
+		<si:header-enricher>
+			<si:header name="foo" value="foo" />
+		</si:header-enricher>
+		<si:service-activator>
+			<bean class="org.springframework.integration.gateway.GatewayInvokingMessaheHandlerTests$SimpleService" />
+		</si:service-activator>
+		<si:gateway default-request-channel="inputC"/>  
+	</si:chain>
+	
+	
+	
+	<si:chain input-channel="inputC">
+		<si:header-enricher>
+			<si:header name="name" value="oleg" />
+		</si:header-enricher>
+		<si:service-activator>
+			<bean class="org.springframework.integration.gateway.GatewayInvokingMessaheHandlerTests$SimpleService" />
+		</si:service-activator>
+	</si:chain>
+
+</beans>

org.springframework.integration/src/test/java/org/springframework/integration/gateway/GatewayInvokingMessaheHandlerTests.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2002-2008 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.gateway;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.integration.channel.SubscribableChannel;
+import org.springframework.integration.core.Message;
+import org.springframework.integration.message.MessageDeliveryException;
+import org.springframework.integration.message.MessageHandler;
+import org.springframework.integration.message.MessageHandlingException;
+import org.springframework.integration.message.MessageRejectedException;
+import org.springframework.integration.message.StringMessage;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+/**
+ * TODO - insert COMMENT
+ * @author Oleg Zhurakousky
+ * @since 2.0
+ */
+@ContextConfiguration
+@RunWith(SpringJUnit4ClassRunner.class)
+public class GatewayInvokingMessaheHandlerTests {
+	@Autowired
+	@Qualifier("inputA")
+	SubscribableChannel channel;
+	
+	@Autowired
+	@Qualifier("simpleGateway")
+	SimpleGateway gateway;
+	
+	@Autowired
+	@Qualifier("inputB")
+	SubscribableChannel output;
+
+	@Test
+	public void validateGatewayInTheChainViaChannel(){	
+		output.subscribe(new MessageHandler() {
+			public void handleMessage(Message<?> message)
+					throws MessageRejectedException, MessageHandlingException,
+					MessageDeliveryException {
+				Assert.assertEquals("echo:echo:hello", message.getPayload());
+				Assert.assertEquals("foo", message.getHeaders().get("foo"));
+				Assert.assertEquals("oleg", message.getHeaders().get("name"));
+			}
+		});
+		channel.send(new StringMessage("hello"));
+	}
+	@Test
+	public void validateGatewayInTheChainViaAnotherGateway(){	
+		output.subscribe(new MessageHandler() {
+			public void handleMessage(Message<?> message)
+					throws MessageRejectedException, MessageHandlingException,
+					MessageDeliveryException {
+				Assert.assertEquals("echo:echo:hello", message.getPayload());
+				Assert.assertEquals("foo", message.getHeaders().get("foo"));
+				Assert.assertEquals("oleg", message.getHeaders().get("name"));
+			}
+		});
+		String result = gateway.sendRecieve("hello");
+		Assert.assertEquals("echo:echo:hello", result);
+	}
+	
+	public static interface SimpleGateway{
+		public String sendRecieve(String str);
+	}
+	
+	public static class SimpleService {
+		public String echo(String str){
+			return "echo:" + str;
+		}
+	}
+}