AMQP-796: Fix Admin Transaction

JIRA: https://jira.spring.io/browse/AMQP-796

If an admin uses a transactional `RabbitTemplate` it will start a transaction.
If the connection was opened due to a `RabbitTemplate` operation it should participate
in the same transaction.
Previously, the template used a second channel and treated it as a local transaction.

Also fix the `RabbitAdmin` so it does no work if there is nothing to declare.

# Conflicts:
#	spring-rabbit/src/main/java/org/springframework/amqp/rabbit/core/RabbitAdmin.java
#	spring-rabbit/src/test/java/org/springframework/amqp/rabbit/core/RabbitAdminDeclarationTests.java
#	spring-rabbit/src/test/java/org/springframework/amqp/rabbit/core/RabbitAdminTests.java
#	spring-rabbit/src/test/java/org/springframework/amqp/rabbit/core/RabbitTemplateTests.java

* Remove `RabbitTemplateTests` changes since they are not related to
the current state of the `RabbitAdmin`: the `RabbitTemplate`-based
constructor has been introduced since version `2.0`

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/connection/ConnectionFactoryUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -138,6 +138,18 @@ private static RabbitResourceHolder doGetTransactionalResourceHolder(ConnectionF
 			channel = ConsumerChannelRegistry.getConsumerChannel(connectionFactory);
 			if (channel == null && connection == null) {
 				connection = resourceFactory.createConnection();
+				if (resourceHolder == null) {
+					/*
+					 * While creating a connection, a connection listener might have created a
+					 * transactional channel and bound it to the transaction.
+					 */
+					resourceHolder = (RabbitResourceHolder) TransactionSynchronizationManager
+							.getResource(connectionFactory);
+					if (resourceHolder != null) {
+						channel = resourceHolder.getChannel();
+						resourceHolderToUse = resourceHolder;
+					}
+				}
 				resourceHolderToUse.addConnection(connection);
 			}
 			if (channel == null) {

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/core/RabbitAdmin.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -497,6 +497,10 @@ else if (declarable instanceof Binding) {
 			}
 		}
 
+		if (exchanges.size() == 0 && queues.size() == 0 && bindings.size() == 0) {
+			this.logger.debug("Nothing to declare");
+			return;
+		}
 		this.rabbitTemplate.execute(new ChannelCallback<Object>() {
 			@Override
 			public Object doInRabbit(Channel channel) throws Exception {

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/core/RabbitAdminDeclarationTests.java

@@ -21,9 +21,12 @@
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.fail;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.BDDMockito.willReturn;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyBoolean;
 import static org.mockito.Matchers.anyMap;
+import static org.mockito.Matchers.anyString;
 import static org.mockito.Matchers.eq;
 import static org.mockito.Matchers.isNull;
 import static org.mockito.Mockito.doAnswer;
@@ -55,6 +58,7 @@
 import org.springframework.amqp.rabbit.connection.Connection;
 import org.springframework.amqp.rabbit.connection.ConnectionFactory;
 import org.springframework.amqp.rabbit.connection.ConnectionListener;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -115,11 +119,14 @@ public void testNoDeclareWithCachedConnections() throws Exception {
 		final List<Channel> mockChannels = new ArrayList<Channel>();
 
 		doAnswer(new Answer<com.rabbitmq.client.Connection>() {
+
 			private int connectionNumber;
+
 			@Override
 			public com.rabbitmq.client.Connection answer(InvocationOnMock invocation) throws Throwable {
 				com.rabbitmq.client.Connection connection = mock(com.rabbitmq.client.Connection.class);
 				doAnswer(new Answer<Channel>() {
+
 					private int channelNumber;
 
 					@Override
@@ -154,7 +161,7 @@ public Channel answer(InvocationOnMock invocation) throws Throwable {
 		ccf.createConnection().close();
 		ccf.destroy();
 
-		assertEquals("Admin should not have created a channel", 0,  mockChannels.size());
+		assertEquals("Admin should not have created a channel", 0, mockChannels.size());
 	}
 
 	@Test
@@ -234,7 +241,7 @@ public Object answer(InvocationOnMock invocation) throws Throwable {
 
 		verify(channel, never()).queueDeclare(eq("foo"), anyBoolean(), anyBoolean(), anyBoolean(), any(Map.class));
 		verify(channel, never())
-			.exchangeDeclare(eq("bar"), eq("direct"), anyBoolean(), anyBoolean(), anyBoolean(), any(Map.class));
+				.exchangeDeclare(eq("bar"), eq("direct"), anyBoolean(), anyBoolean(), anyBoolean(), any(Map.class));
 		verify(channel, never()).queueBind(eq("foo"), eq("bar"), eq("foo"), any(Map.class));
 	}
 
@@ -275,7 +282,7 @@ public Object answer(InvocationOnMock invocation) throws Throwable {
 
 		verify(channel, never()).queueDeclare(eq("foo"), anyBoolean(), anyBoolean(), anyBoolean(), any(Map.class));
 		verify(channel, never())
-			.exchangeDeclare(eq("bar"), eq("direct"), anyBoolean(), anyBoolean(), anyBoolean(), any(Map.class));
+				.exchangeDeclare(eq("bar"), eq("direct"), anyBoolean(), anyBoolean(), anyBoolean(), any(Map.class));
 		verify(channel, never()).queueBind(eq("foo"), eq("bar"), eq("foo"), any(Map.class));
 	}
 
@@ -293,7 +300,7 @@ public void testJavaConfig() throws Exception {
 				.queueDeclare(eq("foo"), anyBoolean(), anyBoolean(), anyBoolean(), isNull(Map.class));
 		verify(Config.channel2, never())
 				.exchangeDeclare(eq("bar"), eq("direct"), anyBoolean(), anyBoolean(),
-								anyBoolean(), anyMap());
+						anyBoolean(), anyMap());
 		verify(Config.channel2, never()).queueBind(eq("foo"), eq("bar"), eq("foo"), anyMap());
 		context.close();
 	}
@@ -308,7 +315,7 @@ public void testAddRemove() {
 		assertEquals(2, queue.getDeclaringAdmins().size());
 		queue.setAdminsThatShouldDeclare(admin1);
 		assertEquals(1, queue.getDeclaringAdmins().size());
-		queue.setAdminsThatShouldDeclare(new Object[] {null});
+		queue.setAdminsThatShouldDeclare(new Object[] { null });
 		assertEquals(0, queue.getDeclaringAdmins().size());
 		queue.setAdminsThatShouldDeclare(admin1, admin2);
 		assertEquals(2, queue.getDeclaringAdmins().size());
@@ -331,6 +338,26 @@ public void testAddRemove() {
 		}
 	}
 
+	@Test
+	public void testNoOpWhenNothingToDeclare() throws Exception {
+		com.rabbitmq.client.ConnectionFactory cf = mock(com.rabbitmq.client.ConnectionFactory.class);
+		com.rabbitmq.client.Connection connection = mock(com.rabbitmq.client.Connection.class);
+		Channel channel = mock(Channel.class, "channel1");
+		given(channel.isOpen()).willReturn(true);
+		willReturn(connection).given(cf).newConnection(any(ExecutorService.class), anyString());
+		given(connection.isOpen()).willReturn(true);
+		given(connection.createChannel()).willReturn(channel);
+		CachingConnectionFactory ccf = new CachingConnectionFactory(cf);
+		ccf.setExecutor(mock(ExecutorService.class));
+		RabbitTemplate rabbitTemplate = new RabbitTemplate(ccf);
+		RabbitAdmin admin = new RabbitAdmin(rabbitTemplate.getConnectionFactory());
+		ApplicationContext ac = mock(ApplicationContext.class);
+		admin.setApplicationContext(ac);
+		admin.afterPropertiesSet();
+		ccf.createConnection();
+		verify(connection, never()).createChannel();
+	}
+
 	@Configuration
 	public static class Config {
 

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/core/RabbitAdminTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2018 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.

spring-rabbit/src/test/java/org/springframework/amqp/rabbit/core/RabbitTemplatePublisherCallbacksIntegrationTests.java

@@ -268,6 +268,7 @@ public void confirm(CorrelationData correlationData, boolean ack, String cause)
 			@Override
 			public void run() {
 				templateWithConfirmsEnabled.execute(new ChannelCallback<Object>() {
+
 					@Override
 					public Object doInRabbit(Channel channel) throws Exception {
 						try {
@@ -325,6 +326,7 @@ public void testPublisherReturns() throws Exception {
 		final CountDownLatch latch = new CountDownLatch(1);
 		final List<Message> returns = new ArrayList<Message>();
 		templateWithReturnsEnabled.setReturnCallback(new ReturnCallback() {
+
 			@Override
 			public void returnedMessage(Message message, int replyCode,
 					String replyText, String exchange, String routingKey) {
@@ -345,6 +347,7 @@ public void testPublisherReturnsWithMandatoryExpression() throws Exception {
 		final CountDownLatch latch = new CountDownLatch(1);
 		final List<Message> returns = new ArrayList<Message>();
 		templateWithReturnsEnabled.setReturnCallback(new ReturnCallback() {
+
 			@Override
 			public void returnedMessage(Message message, int replyCode,
 					String replyText, String exchange, String routingKey) {
@@ -434,6 +437,7 @@ public void confirm(CorrelationData correlationData, boolean ack, String cause)
 			@Override
 			public void run() {
 				template.execute(new ChannelCallback<Object>() {
+
 					@Override
 					public Object doInRabbit(Channel channel) throws Exception {
 						try {
@@ -443,9 +447,9 @@ public Object doInRabbit(Channel channel) throws Exception {
 							Thread.currentThread().interrupt();
 						}
 						template.doSend(channel, "", ROUTE,
-							new SimpleMessageConverter().toMessage("message", new MessageProperties()),
-							false,
-							new CorrelationData("def"));
+								new SimpleMessageConverter().toMessage("message", new MessageProperties()),
+								false,
+								new CorrelationData("def"));
 						threadSentLatch.countDown();
 						return null;
 					}
@@ -488,10 +492,12 @@ public void testPublisherConfirmNotReceivedAged() throws Exception {
 
 		final AtomicInteger count = new AtomicInteger();
 		doAnswer(new Answer<Object>() {
+
 			@Override
 			public Object answer(InvocationOnMock invocation) throws Throwable {
 				return count.incrementAndGet();
-			} }).when(mockChannel).getNextPublishSeqNo();
+			}
+		}).when(mockChannel).getNextPublishSeqNo();
 
 		CachingConnectionFactory ccf = new CachingConnectionFactory(mockConnectionFactory);
 		ccf.setPublisherConfirms(true);
@@ -533,6 +539,7 @@ public void testPublisherConfirmMultiple() throws Exception {
 
 		final AtomicInteger count = new AtomicInteger();
 		doAnswer(new Answer<Object>() {
+
 			@Override
 			public Object answer(InvocationOnMock invocation) throws Throwable {
 				return count.incrementAndGet();
@@ -580,6 +587,7 @@ public void testPublisherConfirmMultipleWithTwoListeners() throws Exception {
 
 		final AtomicInteger count = new AtomicInteger();
 		doAnswer(new Answer<Object>() {
+
 			@Override
 			public Object answer(InvocationOnMock invocation) throws Throwable {
 				return count.incrementAndGet();
@@ -681,6 +689,7 @@ public void confirm(CorrelationData correlationData, boolean ack, String cause)
 			}
 		});
 		Executors.newSingleThreadExecutor().execute(new Runnable() {
+
 			@Override
 			public void run() {
 				template.convertAndSend(ROUTE, (Object) "message", new CorrelationData("abc"));
@@ -689,6 +698,7 @@ public void run() {
 			}
 		});
 		Executors.newSingleThreadExecutor().execute(new Runnable() {
+
 			@Override
 			public void run() {
 				try {
@@ -921,7 +931,8 @@ public void run() {
 					try {
 						template.convertAndSend(ROUTE, (Object) "message", new CorrelationData("abc"));
 					}
-					catch (AmqpException e) { }
+					catch (AmqpException e) {
+					}
 				}
 				sentAll.countDown();
 			}