Added namespace support for a 'bridge' element that simply connects any input-channel to any output-channel. This enables the conversion between PollableChannels and SubscribableChannels and also provides throttling capabilities based on the polling interval (or cron-expression) and 'max-messages-per-poll' settings (INT-193).

org.springframework.integration/src/test/java/org/springframework/integration/config/xml/BridgeParserTests-context.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans:beans xmlns="http://www.springframework.org/schema/integration"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:beans="http://www.springframework.org/schema/beans"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans
+			http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
+			http://www.springframework.org/schema/integration
+			http://www.springframework.org/schema/integration/spring-integration-1.0.xsd">
+
+	<channel id="pollableChannel">
+		<queue/>
+	</channel>
+
+	<channel id="output1">
+		<queue/>
+	</channel>
+
+	<channel id="subscribableChannel"/>
+
+	<channel id="output2">
+		<queue/>
+	</channel>
+
+	<bridge input-channel="pollableChannel" output-channel="output1">
+		<poller max-messages-per-poll="2">
+			<interval-trigger interval="3000"/>
+		</poller>
+	</bridge>
+
+	<bridge input-channel="subscribableChannel" output-channel="output2"/>
+
+</beans:beans>

org.springframework.integration/src/test/java/org/springframework/integration/config/xml/BridgeParserTests.java

@@ -0,0 +1,71 @@
+/*
+ * 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.config.xml;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.integration.channel.PollableChannel;
+import org.springframework.integration.core.Message;
+import org.springframework.integration.core.MessageChannel;
+import org.springframework.integration.message.StringMessage;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.AbstractJUnit4SpringContextTests;
+
+/**
+ * @author Mark Fisher
+ */
+@ContextConfiguration
+public class BridgeParserTests extends AbstractJUnit4SpringContextTests {
+
+	@Autowired
+	@Qualifier("pollableChannel")
+	private PollableChannel pollableChannel;
+
+	@Autowired
+	@Qualifier("subscribableChannel")
+	private MessageChannel subscribableChannel;
+
+	@Autowired
+	@Qualifier("output1")
+	private PollableChannel output1;
+
+	@Autowired
+	@Qualifier("output2")
+	private PollableChannel output2;
+
+
+	@Test
+	public void pollableChannel() {
+		Message<?> message = new StringMessage("test1");
+		this.pollableChannel.send(message);
+		Message<?> reply = this.output1.receive(1000);
+		assertEquals(message, reply);
+	}
+
+	@Test
+	public void subscribableChannel() {
+		Message<?> message = new StringMessage("test2");
+		this.subscribableChannel.send(message);
+		Message<?> reply = this.output2.receive(0);
+		assertEquals(message, reply);
+	}
+
+}