/*
* Copyright 2013-2014 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.cloud.aws.messaging.listener;
import java.util.concurrent.Future;
/**
* Acknowledgment interface that can be injected as parameter into a listener method. The purpose of this acknowledgment
* is to provide a way for the listener methods to acknowledge the reception and processing of a message. The call to
* the {@link Acknowledgment#acknowledge} method triggers some implementation specific clean up tasks like removing a
* message from the SQS queue. The {@link Acknowledgment#acknowledge} method returns a {@link Future} as the acknowledgment can
* involve some asynchronous request to an AWS API.
*
* @author Alain Sahli
* @since 1.1
*/
public interface Acknowledgment {
/**
* The call to this method acknowledges the caller that the listener method has finished the processing of the message
* and triggers some implementation specific clean up tasks like removing a message from the SQS queue.
*
* @return a {@link Future} as the acknowledgment can involve some asynchronous request (i.e. request to an AWS API).
*/
Future<?> acknowledge();
}