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Jakarta Messaging describes a means for Java applications to create, send, and receive messages via loosely coupled, reliable asynchronous communication services.

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/*
 * Copyright (c) 1997, 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package javax.jms;

/**
 * A {@code MessageListener} object is used to receive asynchronously delivered messages.
 *
 * 
 * Each session must ensure that it passes messages serially to the listener. This means that a listener assigned to one
 * or more consumers of the same session can assume that the {@code onMessage} method is not called with the next
 * message until the session has completed the last call.
 *
 * @version JMS 2.0
 * @since JMS 1.0
 *
 */
public interface MessageListener {

    /**
     * Passes a message to the listener.
     *
     * @param message the message passed to the listener
     */
    void onMessage(Message message);
}