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| <h2 title="Interface QueueBrowser" class="title">Interface QueueBrowser</h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd>java.lang.AutoCloseable</dd> |
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| <pre>public interface <span class="typeNameLabel">QueueBrowser</span> |
| extends java.lang.AutoCloseable</pre> |
| <div class="block">A client uses a <code>QueueBrowser</code> object to look at messages on a queue without removing them. |
| |
| <p> |
| The <code>getEnumeration</code> method returns a <code>java.util.Enumeration</code> that is used to scan the queue's messages. |
| It may be an enumeration of the entire content of a queue, or it may contain only the messages matching a message |
| selector. |
| |
| <p> |
| Messages may be arriving and expiring while the scan is done. The Jakarta Messaging API does not require the content of an |
| enumeration to be a static snapshot of queue content. Whether these changes are visible or not depends on the JMS |
| provider. |
| <p> |
| A message must not be returned by a <code>QueueBrowser</code> before its delivery time has been reached. |
| |
| <p> |
| A <code>QueueBrowser</code> can be created from either a <code>Session</code> or a <code>QueueSession</code>.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>JMS 1.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../jakarta/jms/Session.html#createBrowser-jakarta.jms.Queue-"><code>Session.createBrowser(jakarta.jms.Queue)</code></a>, |
| <a href="../../jakarta/jms/QueueSession.html#createBrowser-jakarta.jms.Queue-"><code>QueueSession.createBrowser(jakarta.jms.Queue)</code></a>, |
| <a href="../../jakarta/jms/QueueReceiver.html" title="interface in jakarta.jms"><code>QueueReceiver</code></a></dd> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/jms/QueueBrowser.html#close--">close</a></span>()</code> |
| <div class="block">Closes the <code>QueueBrowser</code>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>java.util.Enumeration</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/jms/QueueBrowser.html#getEnumeration--">getEnumeration</a></span>()</code> |
| <div class="block">Gets an enumeration for browsing the current queue messages in the order they would be received.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/jms/QueueBrowser.html#getMessageSelector--">getMessageSelector</a></span>()</code> |
| <div class="block">Gets this queue browser's message selector expression.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../jakarta/jms/Queue.html" title="interface in jakarta.jms">Queue</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/jms/QueueBrowser.html#getQueue--">getQueue</a></span>()</code> |
| <div class="block">Gets the queue associated with this queue browser.</div> |
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| <h4>getQueue</h4> |
| <pre><a href="../../jakarta/jms/Queue.html" title="interface in jakarta.jms">Queue</a> getQueue() |
| throws <a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></pre> |
| <div class="block">Gets the queue associated with this queue browser.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the queue</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></code> - if the Jakarta Messaging provider fails to get the queue associated with this browser due to some internal |
| error.</dd> |
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| <h4>getMessageSelector</h4> |
| <pre>java.lang.String getMessageSelector() |
| throws <a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></pre> |
| <div class="block">Gets this queue browser's message selector expression.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>this queue browser's message selector, or null if no message selector exists for the message consumer (that |
| is, if the message selector was not set or was set to null or the empty string)</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></code> - if the Jakarta Messaging provider fails to get the message selector for this browser due to some internal |
| error.</dd> |
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| <h4>getEnumeration</h4> |
| <pre>java.util.Enumeration getEnumeration() |
| throws <a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></pre> |
| <div class="block">Gets an enumeration for browsing the current queue messages in the order they would be received.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an enumeration for browsing the messages</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></code> - if the Jakarta Messaging provider fails to get the enumeration for this browser due to some internal error.</dd> |
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| <h4>close</h4> |
| <pre>void close() |
| throws <a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></pre> |
| <div class="block">Closes the <code>QueueBrowser</code>. |
| |
| <p> |
| Since a provider may allocate some resources on behalf of a QueueBrowser outside the Java virtual machine, clients |
| should close them when they are not needed. Relying on garbage collection to eventually reclaim these resources may |
| not be timely enough.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>close</code> in interface <code>java.lang.AutoCloseable</code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../jakarta/jms/JMSException.html" title="class in jakarta.jms">JMSException</a></code> - if the Jakarta Messaging provider fails to close this browser due to some internal error.</dd> |
| </dl> |
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