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Java 2 Platform EE v1.3: Interface DeliveryMode
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javax.jms</FONT>
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Interface DeliveryMode</H2>
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<DT>public interface <B>DeliveryMode</B></DL>
<P>
The delivery modes supported by the JMS API are <CODE>PERSISTENT</CODE> and
<CODE>NON_PERSISTENT</CODE>.
<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.
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/DeliveryMode.html#NON_PERSISTENT">NON_PERSISTENT</A></B></CODE>
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This is the lowest-overhead delivery mode because it does not require
that the message be logged to stable storage.</TD>
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<CODE>static int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/DeliveryMode.html#PERSISTENT">PERSISTENT</A></B></CODE>
<BR>
This delivery mode instructs the JMS provider to log the message to stable
storage as part of the client's send operation.</TD>
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<A NAME="NON_PERSISTENT"><!-- --></A><H3>
NON_PERSISTENT</H3>
<PRE>
public static final int <B>NON_PERSISTENT</B></PRE>
<DL>
<DD>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.</DL>
<HR>
<A NAME="PERSISTENT"><!-- --></A><H3>
PERSISTENT</H3>
<PRE>
public static final int <B>PERSISTENT</B></PRE>
<DL>
<DD>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.</DL>
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