javax.jms.DeliveryMode Maven / Gradle / Ivy
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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;
/**
* The delivery modes supported by the Jakarta Messaging API are {@code PERSISTENT} and {@code NON_PERSISTENT}.
*
*
* A client marks a message as persistent if it feels that the application will have problems if the message is lost in
* transit. A client marks a message as non-persistent if an occasional lost message is tolerable. Clients use delivery
* mode to tell a Jakarta Messaging provider how to balance message transport reliability with throughput.
*
*
* Delivery mode covers only the transport of the message to its destination. Retention of a message at the destination
* until its receipt is acknowledged is not guaranteed by a {@code PERSISTENT} delivery mode. Clients should assume that
* message retention policies are set administratively. Message retention policy governs the reliability of message
* delivery from destination to message consumer. For example, if a client's message storage space is exhausted, some
* messages may be dropped in accordance with a site-specific message retention policy.
*
*
* A message is guaranteed to be delivered once and only once by a Jakarta Messaging provider if the delivery mode of the message is
* {@code PERSISTENT} and if the destination has a sufficient message retention policy.
*
* @version Jakarta Messaging 2.0
* @since JMS 1.0
*/
public interface DeliveryMode {
/**
* This is the lowest-overhead delivery mode because it does not require that the message be logged to stable storage.
* The level of Jakarta Messaging provider failure that causes a {@code NON_PERSISTENT} message to be lost is not defined.
*
*
* A Jakarta Messaging provider must deliver a {@code NON_PERSISTENT} message with an at-most-once guarantee. This means that it may
* lose the message, but it must not deliver it twice.
*/
int NON_PERSISTENT = 1;
/**
* This delivery mode instructs the Jakarta Messaging provider to log the message to stable storage as part of the client's send
* operation. Only a hard media failure should cause a {@code PERSISTENT} message to be lost.
*/
int PERSISTENT = 2;
}