Add "addresses" to RabbitProperties

If user sets addresses it supercedes anything that was set in host
or port (same as in the native ConnectionFactory).

Fixes gh-524

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitAutoConfiguration.java

@@ -98,9 +98,13 @@ public class RabbitAutoConfiguration {
 
 		@Bean
 		public ConnectionFactory rabbitConnectionFactory(RabbitProperties config) {
-			CachingConnectionFactory factory = new CachingConnectionFactory(
+			CachingConnectionFactory factory = new CachingConnectionFactory();
-					config.getHost());
+			String addresses = config.getAddresses();
+			factory.setAddresses(addresses);
+			if (config.getHost() != null) {
+				factory.setHost(config.getHost());
 				factory.setPort(config.getPort());
+			}
 			if (config.getUsername() != null) {
 				factory.setUsername(config.getUsername());
 			}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitProperties.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.autoconfigure.amqp;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.util.StringUtils;
 
 /**
  * Configuration properties for Rabbit.
@@ -36,19 +37,44 @@ public class RabbitProperties {
 
 	private String virtualHost;
 
+	private String addresses;
+
 	private boolean dynamic = true;
 
 	public String getHost() {
+		if (this.addresses == null) {
 			return this.host;
 		}
+		String[] hosts = StringUtils.delimitedListToStringArray(this.addresses, ":");
+		if (hosts.length == 2) {
+			return hosts[0];
+		}
+		return null;
+	}
 
 	public void setHost(String host) {
 		this.host = host;
 	}
 
 	public int getPort() {
+		if (this.addresses == null) {
 			return this.port;
 		}
+		String[] hosts = StringUtils.delimitedListToStringArray(this.addresses, ":");
+		if (hosts.length >= 2) {
+			return Integer
+					.valueOf(StringUtils.commaDelimitedListToStringArray(hosts[1])[0]);
+		}
+		return this.port;
+	}
+
+	public String getAddresses() {
+		return this.addresses == null ? this.host + ":" + this.port : this.addresses;
+	}
+
+	public void setAddresses(String addresses) {
+		this.addresses = addresses;
+	}
 
 	public void setPort(int port) {
 		this.port = port;

spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/amqp/RabbitPropertiesTests.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2012-2013 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.boot.autoconfigure.amqp;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author Dave Syer
+ */
+public class RabbitPropertiesTests {
+
+	private RabbitProperties properties = new RabbitProperties();
+
+	@Test
+	public void addressesNotSet() {
+		assertEquals("localhost", this.properties.getHost());
+		assertEquals(5672, this.properties.getPort());
+	}
+
+	@Test
+	public void addressesSingleValued() {
+		this.properties.setAddresses("myhost:9999");
+		assertEquals("myhost", this.properties.getHost());
+		assertEquals(9999, this.properties.getPort());
+	}
+
+	@Test
+	public void addressesDoubleValued() {
+		this.properties.setAddresses("myhost:9999,otherhost:1111");
+		assertEquals(null, this.properties.getHost());
+		assertEquals(9999, this.properties.getPort());
+	}
+
+}