Add API to settle a batch of messages

pom.xml

@@ -266,6 +266,13 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>io.dropwizard.metrics</groupId>
+            <artifactId>metrics-core</artifactId>
+            <version>4.2.29</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
     <dependencyManagement>
@@ -490,6 +497,7 @@
                 <configuration>
                     <java>
                         <excludes>
+                            <exclude>src/main/java/com/rabbitmq/client/amqp/impl/FastUtil*.java</exclude>
                             <exclude>src/test/java/com/rabbitmq/client/amqp/docs/*.java</exclude>
                             <exclude>src/test/java/SanityCheck.java</exclude>
                         </excludes>

src/docs/asciidoc/usage.adoc

@@ -26,6 +26,21 @@ include::{test-examples}/Api.java[tag=connection-settings]
 <1> Use the `guest` user by default
 <2> Use the `admin` user for this connection
 
+=== Settling Messages in Batch
+
+.Settling messages in batch
+[source,java,indent=0]
+--------
+include::{test-examples}/Api.java[tag=settling-message-in-batch]
+--------
+<1> Declare batch context property
+<2> Create a new batch context instance
+<3> Add the current message context to the batch context if processing is successful
+<4> Settle the batch context once it contains 10 messages
+<5> Reset the batch context
+<6> Discard the current message context if processing fails
+
+
 === Subscription Listener
 
 The client provides a `SubscriptionListener` interface callback to add behavior before a subscription is created.

src/main/java/com/rabbitmq/client/amqp/Consumer.java

@@ -134,5 +134,45 @@ interface Context {
      *     in RabbitMQ</a>
      */
     void requeue(Map<String, Object> annotations);
+
+    /**
+     * Create a batch context to accumulate message contexts and settle them at once.
+     *
+     * <p>The message context the batch context is created from is <b>not</b> added to the batch
+     * context.
+     *
+     * @return the created batch context
+     */
+    BatchContext batch(int batchSizeHint);
+  }
+
+  /**
+   * Context to accumulate message contexts and settle them at once.
+   *
+   * <p>A {@link BatchContext} is also a {@link Context}: the same methods are available to settle
+   * the messages.
+   *
+   * <p>Only "simple" (not batch) message contexts can be added to a batch context. Calling {@link
+   * Context#batch()} on a batch context returns the instance itself.
+   *
+   * @see <a
+   *     href="https://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-transport-v1.0-os.html#type-disposition">AMQP
+   *     1.0 Disposition performative</a>
+   */
+  interface BatchContext extends Context {
+
+    /**
+     * Add a message context to the batch context.
+     *
+     * @param context the message context to add
+     */
+    void add(Context context);
+
+    /**
+     * Get the current number of message contexts in the batch context.
+     *
+     * @return current number of message contexts in the batch
+     */
+    int size();
   }
 }