javax.jms.DeliveryMode Maven / Gradle / Ivy
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package javax.jms;
/** The delivery modes supported by the JMS API are PERSISTENT and
* 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
* JMS 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 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 JMS provider if the delivery mode of the message is
* PERSISTENT
* and if the destination has a sufficient message retention policy.
*
*
*
* @version 1.0 - 7 August 1998
* @author Mark Hapner
* @author Rich Burridge
*/
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 JMS provider
* failure that causes a NON_PERSISTENT message to be lost is
* not defined.
*
*
A JMS provider must deliver a NON_PERSISTENT message
* with an
* at-most-once guarantee. This means that it may lose the message, but it
* must not deliver it twice.
*/
static final int NON_PERSISTENT = 1;
/** This delivery mode instructs the JMS provider to log the message to stable
* storage as part of the client's send operation. Only a hard media
* failure should cause a PERSISTENT message to be lost.
*/
static final int PERSISTENT = 2;
}