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Java 2 Platform EE v1.3: Interface MessageConsumer
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javax.jms</FONT>
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Interface MessageConsumer</H2>
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<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../javax/jms/QueueReceiver.html">QueueReceiver</A>, <A HREF="../../javax/jms/TopicSubscriber.html">TopicSubscriber</A></DD>
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<DT>public interface <B>MessageConsumer</B></DL>
<P>
A client uses a <CODE>MessageConsumer</CODE> object to receive messages
from a destination. A <CODE>MessageConsumer</CODE> object is created by
passing a <CODE>Destination</CODE> object to a message-consumer creation
method supplied by a session.
<P><CODE>MessageConsumer</CODE> is the parent interface for all message
consumers.
<P>A message consumer can be created with a message selector. A message
selector allows
the client to restrict the messages delivered to the message consumer to
those that match the selector.
<P>A client may either synchronously receive a message consumer's messages
or have the consumer asynchronously deliver them as they arrive.
<P>For synchronous receipt, a client can request the next message from a
message consumer using one of its <CODE>receive</CODE> methods. There are
several variations of <CODE>receive</CODE> that allow a
client to poll or wait for the next message.
<P>For asynchronous delivery, a client can register a
<CODE>MessageListener</CODE> object with a message consumer.
As messages arrive at the message consumer, it delivers them by calling the
<CODE>MessageListener</CODE>'s <CODE>onMessage</CODE> method.
<P>It is a client programming error for a <CODE>MessageListener</CODE> to
throw an exception.
<P>
<DL>
<DT><B>See Also: </B><DD><A HREF="../../javax/jms/QueueReceiver.html"><CODE>QueueReceiver</CODE></A>,
<A HREF="../../javax/jms/TopicSubscriber.html"><CODE>TopicSubscriber</CODE></A>,
<A HREF="../../javax/jms/Session.html"><CODE>Session</CODE></A></DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MessageConsumer.html#close()">close</A></B>()</CODE>
<BR>
Closes the message consumer.</TD>
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<CODE> <A HREF="../../javax/jms/MessageListener.html">MessageListener</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MessageConsumer.html#getMessageListener()">getMessageListener</A></B>()</CODE>
<BR>
Gets the message consumer's <CODE>MessageListener</CODE>.</TD>
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<CODE> java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MessageConsumer.html#getMessageSelector()">getMessageSelector</A></B>()</CODE>
<BR>
Gets this message consumer's message selector expression.</TD>
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<CODE> <A HREF="../../javax/jms/Message.html">Message</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MessageConsumer.html#receive()">receive</A></B>()</CODE>
<BR>
Receives the next message produced for this message consumer.</TD>
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<CODE> <A HREF="../../javax/jms/Message.html">Message</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MessageConsumer.html#receive(long)">receive</A></B>(long timeout)</CODE>
<BR>
Receives the next message that arrives within the specified
timeout interval.</TD>
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<CODE> <A HREF="../../javax/jms/Message.html">Message</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MessageConsumer.html#receiveNoWait()">receiveNoWait</A></B>()</CODE>
<BR>
Receives the next message if one is immediately available.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../javax/jms/MessageConsumer.html#setMessageListener(javax.jms.MessageListener)">setMessageListener</A></B>(<A HREF="../../javax/jms/MessageListener.html">MessageListener</A> listener)</CODE>
<BR>
Sets the message consumer's <CODE>MessageListener</CODE>.</TD>
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