Expose JMS message listener container ids

Issue: SPR-13633

spring-jms/src/main/java/org/springframework/jms/config/JmsListenerEndpointRegistry.java

@@ -19,6 +19,7 @@ package org.springframework.jms.config;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -68,12 +69,21 @@ public class JmsListenerEndpointRegistry implements DisposableBean, SmartLifecyc
 	 * @param id the id of the container
 	 * @return the container or {@code null} if no container with that id exists
 	 * @see JmsListenerEndpoint#getId()
+	 * @see #getListenerContainerIds()
 	 */
 	public MessageListenerContainer getListenerContainer(String id) {
 		Assert.notNull(id, "Container identifier must not be null");
 		return this.listenerContainers.get(id);
 	}
 
+	/**
+	 * Return the ids of the managed {@link MessageListenerContainer} instance(s).
+	 * @see #getListenerContainer(String)
+	 */
+	public Set<String> getListenerContainerIds() {
+		return Collections.unmodifiableSet(this.listenerContainers.keySet());
+	}
+
 	/**
 	 * Return the managed {@link MessageListenerContainer} instance(s).
 	 */

spring-jms/src/test/java/org/springframework/jms/annotation/AbstractJmsAnnotationDrivenTests.java

@@ -169,6 +169,8 @@ public abstract class AbstractJmsAnnotationDrivenTests {
 
 		JmsListenerEndpointRegistry customRegistry =
 				context.getBean("customRegistry", JmsListenerEndpointRegistry.class);
+		assertEquals("Wrong number of containers in the registry", 2,
+				customRegistry.getListenerContainerIds().size());
 		assertEquals("Wrong number of containers in the registry", 2,
 				customRegistry.getListenerContainers().size());
 		assertNotNull("Container with custom id on the annotation should be found",

spring-jms/src/test/java/org/springframework/jms/config/JmsListenerEndpointRegistrarTests.java

 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 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.
@@ -76,6 +76,7 @@ public class JmsListenerEndpointRegistrarTests {
 		registrar.afterPropertiesSet();
 		assertNotNull("Container not created", registry.getListenerContainer("some id"));
 		assertEquals(1, registry.getListenerContainers().size());
+		assertEquals("some id", registry.getListenerContainerIds().iterator().next());
 	}
 
 	@Test
@@ -98,6 +99,7 @@ public class JmsListenerEndpointRegistrarTests {
 		registrar.afterPropertiesSet();
 		assertNotNull("Container not created", registry.getListenerContainer("myEndpoint"));
 		assertEquals(1, registry.getListenerContainers().size());
+		assertEquals("myEndpoint", registry.getListenerContainerIds().iterator().next());
 	}
 
 }