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| <h2 title="Interface DeliveryMode" class="title">Interface DeliveryMode</h2> |
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| <pre>public interface <span class="typeNameLabel">DeliveryMode</span></pre> |
| <div class="block">The delivery modes supported by the Jakarta Messaging 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 Jakarta Messaging 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 Jakarta Messaging provider if the delivery mode of the message is |
| <code>PERSISTENT</code> and if the destination has a sufficient message retention policy.</div> |
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| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>JMS 1.0</dd> |
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| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/jms/DeliveryMode.html#NON_PERSISTENT">NON_PERSISTENT</a></span></code> |
| <div class="block">This is the lowest-overhead delivery mode because it does not require that the message be logged to stable storage.</div> |
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| <td class="colFirst"><code>static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/jms/DeliveryMode.html#PERSISTENT">PERSISTENT</a></span></code> |
| <div class="block">This delivery mode instructs the Jakarta Messaging provider to log the message to stable storage as part of the client's send |
| operation.</div> |
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| <h4>NON_PERSISTENT</h4> |
| <pre>static final int NON_PERSISTENT</pre> |
| <div class="block">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</code> message to be lost is not defined. |
| |
| <p> |
| A Jakarta Messaging 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.</div> |
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| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../constant-values.html#jakarta.jms.DeliveryMode.NON_PERSISTENT">Constant Field Values</a></dd> |
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| <h4>PERSISTENT</h4> |
| <pre>static final int PERSISTENT</pre> |
| <div class="block">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</code> message to be lost.</div> |
| <dl> |
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| <dd><a href="../../constant-values.html#jakarta.jms.DeliveryMode.PERSISTENT">Constant Field Values</a></dd> |
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