GH-9695: Replace AMQP tx-size with batch-size

Fixes: #9695
Issue link: #9695

The `txSize` in the `SimpleMessageListenerContainer` has been replaced with more reasonable `batchSize`.
Spring Integration XML support for AMQP module has missed to fix this change: we didn't have a respective test.

* Deprecate `tx-size` (will be removed in `6.5`) XML attribute for the `<amqp:inbound-channel-adapter>`
and introduce `batch-size`
* Cover with the tests
* Fix docs from `tx-size` to `batch-size`

**Auto-cherry-pick to `6.3.x`**

spring-integration-amqp/src/main/java/org/springframework/integration/amqp/config/AbstractAmqpInboundAdapterParser.java

@@ -59,6 +59,7 @@ abstract class AbstractAmqpInboundAdapterParser extends AbstractSingleBeanDefini
 			"receive-timeout",
 			"shutdown-timeout",
 			"tx-size",
+			"batch-size",
 			"missing-queues-fatal"
 	};
 
@@ -154,7 +155,13 @@ private BeanDefinition buildListenerContainer(Element element, ParserContext par
 		}
 		builder.addConstructorArgReference(connectionFactoryRef);
 		for (String attributeName : CONTAINER_VALUE_ATTRIBUTES) {
-			IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, attributeName);
+			// TODO remove 'tx-size' in 6.5
+			if ("tx-size".equals(attributeName)) {
+				IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, attributeName, "batchSize");
+			}
+			else {
+				IntegrationNamespaceUtils.setValueIfAttributeDefined(builder, element, attributeName);
+			}
 		}
 		for (String attributeName : CONTAINER_REFERENCE_ATTRIBUTES) {
 			IntegrationNamespaceUtils.setReferenceIfAttributeDefined(builder, element, attributeName);

spring-integration-amqp/src/main/resources/org/springframework/integration/amqp/config/spring-integration-amqp.xsd

@@ -969,7 +969,7 @@ standard headers to also be mapped. To map all non-standard headers the 'NON_STA
 				<xsd:documentation>
 					Acknowledge Mode for the MessageListenerContainer; default 'AUTO'
 					meaning the adapter automatically acknowledges the message(s)
-					according to the tx-size.
+					according to the batch-size.
 				</xsd:documentation>
 			</xsd:annotation>
 			<xsd:simpleType>
@@ -1039,7 +1039,7 @@ standard headers to also be mapped. To map all non-standard headers the 'NON_STA
 					<xsd:documentation>
 						Specifies how many messages to send to each consumer in a single request. Often this can be set
 						quite high
-						to improve throughput. It should be greater than or equal to the tx-size value.
+						to improve throughput. It should be greater than or equal to the batch-size value.
 					</xsd:documentation>
 				</xsd:appinfo>
 			</xsd:annotation>
@@ -1117,10 +1117,23 @@ standard headers to also be mapped. To map all non-standard headers the 'NON_STA
 			<xsd:annotation>
 				<xsd:appinfo>
 					<xsd:documentation>
+						[DEPRECATED]
 						How many messages to process in a single transaction (if the channel is transactional). For best
 						results it should be
 						less than or equal to the prefetch count.
 						Not allowed when 'consumers-per-queue' is set.
+						Deprecated in favor of 'batch-size'.
+					</xsd:documentation>
+				</xsd:appinfo>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="batch-size" type="xsd:string">
+			<xsd:annotation>
+				<xsd:appinfo>
+					<xsd:documentation>
+						How many messages to process in a single request.
+						For best results it should be less than or equal to the prefetch count.
+						Not allowed when 'consumers-per-queue' is set.
 					</xsd:documentation>
 				</xsd:appinfo>
 			</xsd:annotation>

spring-integration-amqp/src/test/java/org/springframework/integration/amqp/config/AmqpInboundChannelAdapterParserTests-context.xml

@@ -1,14 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xmlns:amqp="http://www.springframework.org/schema/integration/amqp"
-	xmlns:int="http://www.springframework.org/schema/integration"
-	xmlns:rabbit="http://www.springframework.org/schema/rabbit"
-	xmlns:context="http://www.springframework.org/schema/context"
-	xmlns:util="http://www.springframework.org/schema/util"
-	xsi:schemaLocation="http://www.springframework.org/schema/integration/amqp https://www.springframework.org/schema/integration/amqp/spring-integration-amqp.xsd
+	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	   xmlns:amqp="http://www.springframework.org/schema/integration/amqp"
+	   xmlns:int="http://www.springframework.org/schema/integration"
+	   xmlns:context="http://www.springframework.org/schema/context"
+	   xmlns:util="http://www.springframework.org/schema/util"
+	   xsi:schemaLocation="http://www.springframework.org/schema/integration/amqp https://www.springframework.org/schema/integration/amqp/spring-integration-amqp.xsd
 		http://www.springframework.org/schema/integration https://www.springframework.org/schema/integration/spring-integration.xsd
-		http://www.springframework.org/schema/rabbit https://www.springframework.org/schema/rabbit/spring-rabbit.xsd
 		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
 		http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd
 		http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
@@ -20,32 +18,34 @@
 	</util:properties>
 
 	<amqp:inbound-channel-adapter id="rabbitInbound" queue-names="inboundchanneladapter.test.1"
-			batch-mode="EXTRACT_PAYLOADS"/>
+								  batch-mode="EXTRACT_PAYLOADS" tx-size="2"/>
 
 	<amqp:inbound-channel-adapter id="autoStartFalse" queue-names="inboundchanneladapter.test.2"
-		auto-startup="false" phase="123" acknowledge-mode="${ackMode}" missing-queues-fatal="false" />
+								  auto-startup="false" phase="123" acknowledge-mode="${ackMode}"
+								  missing-queues-fatal="false"
+								  batch-size="3"/>
 
 	<amqp:inbound-channel-adapter id="withHeaderMapperStandardAndCustomHeaders"
-		channel="requestChannel" queue-names="inboundchanneladapter.test.2"
-		auto-startup="false" phase="123"
-		mapped-request-headers="foo*, STANDARD_REQUEST_HEADERS"/>
+								  channel="requestChannel" queue-names="inboundchanneladapter.test.2"
+								  auto-startup="false" phase="123"
+								  mapped-request-headers="foo*, STANDARD_REQUEST_HEADERS"/>
 
 	<amqp:inbound-channel-adapter id="withHeaderMapperOnlyCustomHeaders"
-		channel="requestChannel" queue-names="inboundchanneladapter.test.2"
-		auto-startup="false" phase="123"
-		mapped-request-headers="foo*"/>
+								  channel="requestChannel" queue-names="inboundchanneladapter.test.2"
+								  auto-startup="false" phase="123"
+								  mapped-request-headers="foo*"/>
 
 	<amqp:inbound-channel-adapter id="withHeaderMapperNothingToMap"
-		channel="requestChannel" queue-names="inboundchanneladapter.test.2"
-		auto-startup="false" phase="123"
-		mapped-request-headers=""/>
+								  channel="requestChannel" queue-names="inboundchanneladapter.test.2"
+								  auto-startup="false" phase="123"
+								  mapped-request-headers=""/>
 
 	<amqp:inbound-channel-adapter id="withHeaderMapperDefaultMapping"
-		channel="requestChannel" queue-names="inboundchanneladapter.test.2"
-		auto-startup="false" phase="123"/>
+								  channel="requestChannel" queue-names="inboundchanneladapter.test.2"
+								  auto-startup="false" phase="123"/>
 
 	<amqp:inbound-channel-adapter id="dmlc" queue-names="inboundchanneladapter.test.2" consumers-per-queue="2"
-		auto-startup="false" />
+								  auto-startup="false"/>
 
 	<int:channel id="requestChannel">
 		<int:queue/>

spring-integration-amqp/src/test/java/org/springframework/integration/amqp/config/AmqpInboundChannelAdapterParserTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -16,8 +16,7 @@
 
 package org.springframework.integration.amqp.config;
 
-import org.junit.Test;
-import org.junit.runner.RunWith;
+import org.junit.jupiter.api.Test;
 
 import org.springframework.amqp.core.AcknowledgeMode;
 import org.springframework.amqp.core.Message;
@@ -37,10 +36,10 @@
 import org.springframework.integration.channel.QueueChannel;
 import org.springframework.integration.test.util.TestUtils;
 import org.springframework.test.annotation.DirtiesContext;
-import org.springframework.test.context.ContextConfiguration;
-import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 
 /**
  * @author Mark Fisher
@@ -49,8 +48,7 @@
  *
  * @since 2.1
  */
-@ContextConfiguration
-@RunWith(SpringJUnit4ClassRunner.class)
+@SpringJUnitConfig
 @DirtiesContext
 public class AmqpInboundChannelAdapterParserTests {
 
@@ -71,6 +69,8 @@ public void verifyIdAsChannel() {
 				.isInstanceOf(SimpleMessageListenerContainer.class);
 		assertThat(TestUtils.getPropertyValue(adapter, "batchMode", BatchMode.class))
 				.isEqualTo(BatchMode.EXTRACT_PAYLOADS);
+		assertThat(TestUtils.getPropertyValue(adapter, "messageListenerContainer.batchSize", Integer.class))
+				.isEqualTo(2);
 	}
 
 	@Test
@@ -95,6 +95,8 @@ public void verifyLifeCycle() {
 				.isEqualTo(AcknowledgeMode.NONE);
 		assertThat(TestUtils.getPropertyValue(adapter, "messageListenerContainer.missingQueuesFatal", Boolean.class))
 				.isFalse();
+		assertThat(TestUtils.getPropertyValue(adapter, "messageListenerContainer.batchSize", Integer.class))
+				.isEqualTo(3);
 	}
 
 	@Test
@@ -216,14 +218,13 @@ public void withHeaderMapperDefaultMapping() throws Exception {
 
 	@Test
 	public void testInt2971HeaderMapperAndMappedHeadersExclusivity() {
-		try {
-			new ClassPathXmlApplicationContext("AmqpInboundChannelAdapterParserTests-headerMapper-fail-context.xml",
-					this.getClass()).close();
-		}
-		catch (BeanDefinitionParsingException e) {
-			assertThat(e.getMessage().startsWith("Configuration problem: The 'header-mapper' attribute " +
-					"is mutually exclusive with 'mapped-request-headers' or 'mapped-reply-headers'")).isTrue();
-		}
+		assertThatExceptionOfType(BeanDefinitionParsingException.class)
+				.isThrownBy(() ->
+						new ClassPathXmlApplicationContext(
+								"AmqpInboundChannelAdapterParserTests-headerMapper-fail-context.xml",
+								getClass()))
+				.withMessageStartingWith("Configuration problem: The 'header-mapper' attribute " +
+						"is mutually exclusive with 'mapped-request-headers' or 'mapped-reply-headers'");
 	}
 
 }

src/reference/antora/modules/ROOT/pages/amqp.adoc

@@ -32,7 +32,7 @@ The following adapters are available:
 * xref:amqp/inbound-gateway.adoc[Inbound Gateway]
 * xref:amqp/outbound-channel-adapter.adoc[Outbound Channel Adapter]
 * xref:amqp/outbound-gateway.adoc[Outbound Gateway]
-* xref:amqp-async-outbound-gateway[Async Outbound Gateway]
+* xref:amqp/async-outbound-gateway.adoc[Async Outbound Gateway]
 * xref:amqp/rmq-streams.adoc#rmq-stream-inbound-channel-adapter[RabbitMQ Stream Queue Inbound Channel Adapter]
 * xref:amqp/rmq-streams.adoc#rmq-stream-outbound-channel-adapter[RabbitMQ Stream Queue Outbound Channel Adapter]
 

src/reference/antora/modules/ROOT/pages/amqp/inbound-channel-adapter.adoc

@@ -87,7 +87,7 @@ XML::
                                   task-executor=""                <22>
                                   transaction-attribute=""        <23>
                                   transaction-manager=""          <24>
-                                  tx-size=""                      <25>
+                                  batch-size=""                   <25>
                                   consumers-per-queue             <26>
                                   batch-mode="MESSAGES"/>         <27>
 
@@ -146,7 +146,7 @@ By default, this value is `Integer.MAX_VALUE`, meaning that this container start
 Optional.
 <17> Tells the AMQP broker how many messages to send to each consumer in a single request.
 Often, you can set this value high to improve throughput.
-It should be greater than or equal to the transaction size (see the `tx-size` attribute, later in this list).
+It should be greater than or equal to the transaction size (see the `batch-size` attribute, later in this list).
 Optional (defaults to `1`).
 <18> Receive timeout in milliseconds.
 Optional (defaults to `1000`).
@@ -173,7 +173,7 @@ If the `channelTransacted` flag is `false`, no transaction semantics apply to th
 For further information, see
 https://docs.spring.io/spring-amqp/reference/html/%255Freference.html#%5Ftransactions[Transactions with Spring AMQP].
 Optional.
-<25> Tells the `SimpleMessageListenerContainer` how many messages to process in a single transaction (if the channel is transactional).
+<25> Tells the `SimpleMessageListenerContainer` how many messages to process in a single request.
 For best results, it should be less than or equal to the value set in `prefetch-count`.
 Not allowed when 'consumers-per-queue' is set.
 Optional (defaults to `1`).

src/reference/antora/modules/ROOT/pages/amqp/inbound-gateway.adoc

@@ -10,7 +10,7 @@ Java DSL::
 +
 [source, java, role="primary"]
 ----
-@Bean // return the upper cased payload
+@Bean // return the upper-cased payload
 public IntegrationFlow amqpInboundGateway(ConnectionFactory connectionFactory) {
     return IntegrationFlow.from(Amqp.inboundGateway(connectionFactory, "foo"))
             .transform(String.class, String::toUpperCase)