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package javax.jms;

 * The delivery modes supported by the JMS API are <CODE>PERSISTENT</CODE> and
 * <P>
 * 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.
 * <P>
 * 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</CODE> 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.
 * <P>
 * A message is guaranteed to be delivered once and only once by a JMS provider
 * if the delivery mode of the message is <CODE>PERSISTENT</CODE> 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 <CODE>NON_PERSISTENT</CODE> message to be lost is
   * not defined.
   * <P>
   * A JMS provider must deliver a <CODE>NON_PERSISTENT</CODE> 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 <CODE>PERSISTENT</CODE> message to be lost.

  static final int PERSISTENT = 2;
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