source: branches/objectmq_old/lib/rabbitmq-java-client-javadoc-3.0.1/com/rabbitmq/client/QueueingConsumer.html

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5<!-- Generated by javadoc (build 1.6.0_18) on Tue Dec 11 11:47:09 GMT 2012 -->
6<TITLE>
7QueueingConsumer
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90com.rabbitmq.client</FONT>
91<BR>
92Class QueueingConsumer</H2>
93<PRE>
94java.lang.Object
95  <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html" title="class in com.rabbitmq.client">com.rabbitmq.client.DefaultConsumer</A>
96      <IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.rabbitmq.client.QueueingConsumer</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../com/rabbitmq/client/Consumer.html" title="interface in com.rabbitmq.client">Consumer</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>QueueingConsumer</B><DT>extends <A HREF="../../../com/rabbitmq/client/DefaultConsumer.html" title="class in com.rabbitmq.client">DefaultConsumer</A></DL>
104</PRE>
105
106<P>
107Convenience class: an implementation of <A HREF="../../../com/rabbitmq/client/Consumer.html" title="interface in com.rabbitmq.client"><CODE>Consumer</CODE></A> with
108 straightforward blocking semantics.
109
110 The general pattern for using QueueingConsumer is as follows:
111
112 <pre>
113 // Create connection and channel.
114 <A HREF="../../../com/rabbitmq/client/ConnectionFactory.html" title="class in com.rabbitmq.client"><CODE>ConnectionFactory</CODE></A> factory = new ConnectionFactory();
115 Connection conn = factory.newConnection();
116 <A HREF="../../../com/rabbitmq/client/Channel.html" title="interface in com.rabbitmq.client"><CODE>Channel</CODE></A> ch1 = conn.createChannel();
117
118 // Declare a queue and bind it to an exchange.
119 String queueName = ch1.queueDeclare().<A HREF="../../../com/rabbitmq/client/AMQP.Queue.DeclareOk.html#getQueue()"><CODE>getQueue</CODE></A>();
120 ch1.<A HREF="../../../com/rabbitmq/client/Channel.html#queueBind(java.lang.String, java.lang.String, java.lang.String)"><CODE>queueBind</CODE></A>(queueName, exchangeName, queueName);
121
122 // Create the QueueingConsumer and have it consume from the queue
123 QueueingConsumer consumer = new <A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#QueueingConsumer(com.rabbitmq.client.Channel)"><CODE>QueueingConsumer</CODE></A>(ch1);
124 ch1.<A HREF="../../../com/rabbitmq/client/Channel.html#basicConsume(java.lang.String, com.rabbitmq.client.Consumer)"><CODE>basicConsume</CODE></A>(queueName, false, consumer);
125
126 // Process deliveries
127 while (/* some condition * /) {
128     <A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client"><CODE>QueueingConsumer.Delivery</CODE></A> delivery = consumer.<A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#nextDelivery()"><CODE>nextDelivery</CODE></A>();
129     // process delivery
130     ch1.<A HREF="../../../com/rabbitmq/client/Channel.html#basicAck(long, boolean)"><CODE>basicAck</CODE></A>(delivery.<A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html#getEnvelope()"><CODE>getEnvelope</CODE></A>().<A HREF="../../../com/rabbitmq/client/Envelope.html#getDeliveryTag()"><CODE>getDeliveryTag</CODE></A>(), false);
131 }
132 </pre>
133
134
135 <p>For a more complete example, see LogTail in the <code>test/src/com/rabbitmq/examples</code>
136 directory of the source distribution.</p>
137 <p/>
138 <b>deprecated</b> <i><code>QueueingConsumer</code> was introduced to allow
139 applications to overcome a limitation in the way <code>Connection</code>
140 managed threads and consumer dispatching. When <code>QueueingConsumer</code>
141 was introduced, callbacks to <code>Consumers</code> were made on the
142 <code>Connection's</code> thread. This had two main drawbacks. Firstly, the
143 <code>Consumer</code> could stall the processing of all
144 <code>Channels</code> on the <code>Connection</code>. Secondly, if a
145 <code>Consumer</code> made a recursive synchronous call into its
146 <code>Channel</code> the client would deadlock.
147 <p/>
148 <code>QueueingConsumer</code> provided client code with an easy way to
149 obviate this problem by queueing incoming messages and processing them on
150 a separate, application-managed thread.
151 <p/>
152 The threading behaviour of <code>Connection</code> and <code>Channel</code>
153 has been changed so that each <code>Channel</code> uses a distinct thread
154 for dispatching to <code>Consumers</code>. This prevents
155 <code>Consumers</code> on one <code>Channel</code> holding up
156 <code>Consumers</code> on another and it also prevents recursive calls from
157 deadlocking the client.
158 <p/>
159 As such, it is now safe to implement <code>Consumer</code> directly or
160 to extend <code>DefaultConsumer</code>.</i>
161<P>
162
163<P>
164<HR>
165
166<P>
167<!-- ======== NESTED CLASS SUMMARY ======== -->
168
169<A NAME="nested_class_summary"><!-- --></A>
170<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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172<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
173<B>Nested Class Summary</B></FONT></TH>
174</TR>
175<TR BGCOLOR="white" CLASS="TableRowColor">
176<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
177<CODE>static&nbsp;class</CODE></FONT></TD>
178<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client">QueueingConsumer.Delivery</A></B></CODE>
179
180<BR>
181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Encapsulates an arbitrary message - simple "bean" holder structure.</TD>
182</TR>
183</TABLE>
184&nbsp;
185<!-- ======== CONSTRUCTOR SUMMARY ======== -->
186
187<A NAME="constructor_summary"><!-- --></A>
188<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
189<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
190<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
191<B>Constructor Summary</B></FONT></TH>
192</TR>
193<TR BGCOLOR="white" CLASS="TableRowColor">
194<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#QueueingConsumer(com.rabbitmq.client.Channel)">QueueingConsumer</A></B>(<A HREF="../../../com/rabbitmq/client/Channel.html" title="interface in com.rabbitmq.client">Channel</A>&nbsp;ch)</CODE>
195
196<BR>
197&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
198</TR>
199<TR BGCOLOR="white" CLASS="TableRowColor">
200<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#QueueingConsumer(com.rabbitmq.client.Channel, java.util.concurrent.BlockingQueue)">QueueingConsumer</A></B>(<A HREF="../../../com/rabbitmq/client/Channel.html" title="interface in com.rabbitmq.client">Channel</A>&nbsp;ch,
201                 java.util.concurrent.BlockingQueue&lt;<A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client">QueueingConsumer.Delivery</A>&gt;&nbsp;q)</CODE>
202
203<BR>
204&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
205</TR>
206</TABLE>
207&nbsp;
208<!-- ========== METHOD SUMMARY =========== -->
209
210<A NAME="method_summary"><!-- --></A>
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212<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
213<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
214<B>Method Summary</B></FONT></TH>
215</TR>
216<TR BGCOLOR="white" CLASS="TableRowColor">
217<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
218<CODE>&nbsp;void</CODE></FONT></TD>
219<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#handleCancel(java.lang.String)">handleCancel</A></B>(java.lang.String&nbsp;consumerTag)</CODE>
220
221<BR>
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No-op implementation of <A HREF="../../../com/rabbitmq/client/Consumer.html#handleCancel(java.lang.String)"><CODE>Consumer.handleCancel(String)</CODE></A></TD>
223</TR>
224<TR BGCOLOR="white" CLASS="TableRowColor">
225<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
226<CODE>&nbsp;void</CODE></FONT></TD>
227<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])">handleDelivery</A></B>(java.lang.String&nbsp;consumerTag,
228               <A HREF="../../../com/rabbitmq/client/Envelope.html" title="class in com.rabbitmq.client">Envelope</A>&nbsp;envelope,
229               <A HREF="../../../com/rabbitmq/client/AMQP.BasicProperties.html" title="class in com.rabbitmq.client">AMQP.BasicProperties</A>&nbsp;properties,
230               byte[]&nbsp;body)</CODE>
231
232<BR>
233&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No-op implementation of <A HREF="../../../com/rabbitmq/client/Consumer.html#handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])"><CODE>Consumer.handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])</CODE></A>.</TD>
234</TR>
235<TR BGCOLOR="white" CLASS="TableRowColor">
236<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
237<CODE>&nbsp;void</CODE></FONT></TD>
238<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)">handleShutdownSignal</A></B>(java.lang.String&nbsp;consumerTag,
239                     <A HREF="../../../com/rabbitmq/client/ShutdownSignalException.html" title="class in com.rabbitmq.client">ShutdownSignalException</A>&nbsp;sig)</CODE>
240
241<BR>
242&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No-op implementation of <A HREF="../../../com/rabbitmq/client/Consumer.html#handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)"><CODE>Consumer.handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)</CODE></A>.</TD>
243</TR>
244<TR BGCOLOR="white" CLASS="TableRowColor">
245<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
246<CODE>&nbsp;<A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client">QueueingConsumer.Delivery</A></CODE></FONT></TD>
247<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#nextDelivery()">nextDelivery</A></B>()</CODE>
248
249<BR>
250&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Main application-side API: wait for the next message delivery and return it.</TD>
251</TR>
252<TR BGCOLOR="white" CLASS="TableRowColor">
253<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
254<CODE>&nbsp;<A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client">QueueingConsumer.Delivery</A></CODE></FONT></TD>
255<TD><CODE><B><A HREF="../../../com/rabbitmq/client/QueueingConsumer.html#nextDelivery(long)">nextDelivery</A></B>(long&nbsp;timeout)</CODE>
256
257<BR>
258&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Main application-side API: wait for the next message delivery and return it.</TD>
259</TR>
260</TABLE>
261&nbsp;<A NAME="methods_inherited_from_class_com.rabbitmq.client.DefaultConsumer"><!-- --></A>
262<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
263<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
264<TH ALIGN="left"><B>Methods inherited from class com.rabbitmq.client.<A HREF="../../../com/rabbitmq/client/DefaultConsumer.html" title="class in com.rabbitmq.client">DefaultConsumer</A></B></TH>
265</TR>
266<TR BGCOLOR="white" CLASS="TableRowColor">
267<TD><CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#getChannel()">getChannel</A>, <A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#getConsumerTag()">getConsumerTag</A>, <A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleCancelOk(java.lang.String)">handleCancelOk</A>, <A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleConsumeOk(java.lang.String)">handleConsumeOk</A>, <A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleRecoverOk(java.lang.String)">handleRecoverOk</A></CODE></TD>
268</TR>
269</TABLE>
270&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
271<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
272<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
273<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
274</TR>
275<TR BGCOLOR="white" CLASS="TableRowColor">
276<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
277</TR>
278</TABLE>
279&nbsp;
280<P>
281
282<!-- ========= CONSTRUCTOR DETAIL ======== -->
283
284<A NAME="constructor_detail"><!-- --></A>
285<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
286<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
287<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
288<B>Constructor Detail</B></FONT></TH>
289</TR>
290</TABLE>
291
292<A NAME="QueueingConsumer(com.rabbitmq.client.Channel)"><!-- --></A><H3>
293QueueingConsumer</H3>
294<PRE>
295public <B>QueueingConsumer</B>(<A HREF="../../../com/rabbitmq/client/Channel.html" title="interface in com.rabbitmq.client">Channel</A>&nbsp;ch)</PRE>
296<DL>
297</DL>
298<HR>
299
300<A NAME="QueueingConsumer(com.rabbitmq.client.Channel, java.util.concurrent.BlockingQueue)"><!-- --></A><H3>
301QueueingConsumer</H3>
302<PRE>
303public <B>QueueingConsumer</B>(<A HREF="../../../com/rabbitmq/client/Channel.html" title="interface in com.rabbitmq.client">Channel</A>&nbsp;ch,
304                        java.util.concurrent.BlockingQueue&lt;<A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client">QueueingConsumer.Delivery</A>&gt;&nbsp;q)</PRE>
305<DL>
306</DL>
307
308<!-- ============ METHOD DETAIL ========== -->
309
310<A NAME="method_detail"><!-- --></A>
311<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
312<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
313<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
314<B>Method Detail</B></FONT></TH>
315</TR>
316</TABLE>
317
318<A NAME="handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)"><!-- --></A><H3>
319handleShutdownSignal</H3>
320<PRE>
321public void <B>handleShutdownSignal</B>(java.lang.String&nbsp;consumerTag,
322                                 <A HREF="../../../com/rabbitmq/client/ShutdownSignalException.html" title="class in com.rabbitmq.client">ShutdownSignalException</A>&nbsp;sig)</PRE>
323<DL>
324<DD><B>Description copied from class: <CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)">DefaultConsumer</A></CODE></B></DD>
325<DD>No-op implementation of <A HREF="../../../com/rabbitmq/client/Consumer.html#handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)"><CODE>Consumer.handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)</CODE></A>.
326<P>
327<DD><DL>
328<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/rabbitmq/client/Consumer.html#handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)">handleShutdownSignal</A></CODE> in interface <CODE><A HREF="../../../com/rabbitmq/client/Consumer.html" title="interface in com.rabbitmq.client">Consumer</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleShutdownSignal(java.lang.String, com.rabbitmq.client.ShutdownSignalException)">handleShutdownSignal</A></CODE> in class <CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html" title="class in com.rabbitmq.client">DefaultConsumer</A></CODE></DL>
329</DD>
330<DD><DL>
331<DT><B>Parameters:</B><DD><CODE>consumerTag</CODE> - the <i>consumer tag</i> associated with the consumer<DD><CODE>sig</CODE> - a <A HREF="../../../com/rabbitmq/client/ShutdownSignalException.html" title="class in com.rabbitmq.client"><CODE>ShutdownSignalException</CODE></A> indicating the reason for the shut down</DL>
332</DD>
333</DL>
334<HR>
335
336<A NAME="handleCancel(java.lang.String)"><!-- --></A><H3>
337handleCancel</H3>
338<PRE>
339public void <B>handleCancel</B>(java.lang.String&nbsp;consumerTag)
340                  throws java.io.IOException</PRE>
341<DL>
342<DD><B>Description copied from class: <CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleCancel(java.lang.String)">DefaultConsumer</A></CODE></B></DD>
343<DD>No-op implementation of <A HREF="../../../com/rabbitmq/client/Consumer.html#handleCancel(java.lang.String)"><CODE>Consumer.handleCancel(String)</CODE></A>
344<P>
345<DD><DL>
346<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/rabbitmq/client/Consumer.html#handleCancel(java.lang.String)">handleCancel</A></CODE> in interface <CODE><A HREF="../../../com/rabbitmq/client/Consumer.html" title="interface in com.rabbitmq.client">Consumer</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleCancel(java.lang.String)">handleCancel</A></CODE> in class <CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html" title="class in com.rabbitmq.client">DefaultConsumer</A></CODE></DL>
347</DD>
348<DD><DL>
349<DT><B>Parameters:</B><DD><CODE>consumerTag</CODE> - the defined consumer tag (client- or server-generated)
350<DT><B>Throws:</B>
351<DD><CODE>java.io.IOException</CODE></DL>
352</DD>
353</DL>
354<HR>
355
356<A NAME="handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])"><!-- --></A><H3>
357handleDelivery</H3>
358<PRE>
359public void <B>handleDelivery</B>(java.lang.String&nbsp;consumerTag,
360                           <A HREF="../../../com/rabbitmq/client/Envelope.html" title="class in com.rabbitmq.client">Envelope</A>&nbsp;envelope,
361                           <A HREF="../../../com/rabbitmq/client/AMQP.BasicProperties.html" title="class in com.rabbitmq.client">AMQP.BasicProperties</A>&nbsp;properties,
362                           byte[]&nbsp;body)
363                    throws java.io.IOException</PRE>
364<DL>
365<DD><B>Description copied from class: <CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])">DefaultConsumer</A></CODE></B></DD>
366<DD>No-op implementation of <A HREF="../../../com/rabbitmq/client/Consumer.html#handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])"><CODE>Consumer.handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])</CODE></A>.
367<P>
368<DD><DL>
369<DT><B>Specified by:</B><DD><CODE><A HREF="../../../com/rabbitmq/client/Consumer.html#handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])">handleDelivery</A></CODE> in interface <CODE><A HREF="../../../com/rabbitmq/client/Consumer.html" title="interface in com.rabbitmq.client">Consumer</A></CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html#handleDelivery(java.lang.String, com.rabbitmq.client.Envelope, com.rabbitmq.client.AMQP.BasicProperties, byte[])">handleDelivery</A></CODE> in class <CODE><A HREF="../../../com/rabbitmq/client/DefaultConsumer.html" title="class in com.rabbitmq.client">DefaultConsumer</A></CODE></DL>
370</DD>
371<DD><DL>
372<DT><B>Parameters:</B><DD><CODE>consumerTag</CODE> - the <i>consumer tag</i> associated with the consumer<DD><CODE>envelope</CODE> - packaging data for the message<DD><CODE>properties</CODE> - content header data for the message<DD><CODE>body</CODE> - the message body (opaque, client-specific byte array)
373<DT><B>Throws:</B>
374<DD><CODE>java.io.IOException</CODE> - if the consumer encounters an I/O error while processing the message<DT><B>See Also:</B><DD><A HREF="../../../com/rabbitmq/client/Envelope.html" title="class in com.rabbitmq.client"><CODE>Envelope</CODE></A></DL>
375</DD>
376</DL>
377<HR>
378
379<A NAME="nextDelivery()"><!-- --></A><H3>
380nextDelivery</H3>
381<PRE>
382public <A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client">QueueingConsumer.Delivery</A> <B>nextDelivery</B>()
383                                       throws java.lang.InterruptedException,
384                                              <A HREF="../../../com/rabbitmq/client/ShutdownSignalException.html" title="class in com.rabbitmq.client">ShutdownSignalException</A>,
385                                              <A HREF="../../../com/rabbitmq/client/ConsumerCancelledException.html" title="class in com.rabbitmq.client">ConsumerCancelledException</A></PRE>
386<DL>
387<DD>Main application-side API: wait for the next message delivery and return it.
388<P>
389<DD><DL>
390
391<DT><B>Returns:</B><DD>the next message
392<DT><B>Throws:</B>
393<DD><CODE>java.lang.InterruptedException</CODE> - if an interrupt is received while waiting
394<DD><CODE><A HREF="../../../com/rabbitmq/client/ShutdownSignalException.html" title="class in com.rabbitmq.client">ShutdownSignalException</A></CODE> - if the connection is shut down while waiting
395<DD><CODE><A HREF="../../../com/rabbitmq/client/ConsumerCancelledException.html" title="class in com.rabbitmq.client">ConsumerCancelledException</A></CODE> - if this consumer is cancelled while waiting</DL>
396</DD>
397</DL>
398<HR>
399
400<A NAME="nextDelivery(long)"><!-- --></A><H3>
401nextDelivery</H3>
402<PRE>
403public <A HREF="../../../com/rabbitmq/client/QueueingConsumer.Delivery.html" title="class in com.rabbitmq.client">QueueingConsumer.Delivery</A> <B>nextDelivery</B>(long&nbsp;timeout)
404                                       throws java.lang.InterruptedException,
405                                              <A HREF="../../../com/rabbitmq/client/ShutdownSignalException.html" title="class in com.rabbitmq.client">ShutdownSignalException</A>,
406                                              <A HREF="../../../com/rabbitmq/client/ConsumerCancelledException.html" title="class in com.rabbitmq.client">ConsumerCancelledException</A></PRE>
407<DL>
408<DD>Main application-side API: wait for the next message delivery and return it.
409<P>
410<DD><DL>
411<DT><B>Parameters:</B><DD><CODE>timeout</CODE> - timeout in millisecond
412<DT><B>Returns:</B><DD>the next message or null if timed out
413<DT><B>Throws:</B>
414<DD><CODE>java.lang.InterruptedException</CODE> - if an interrupt is received while waiting
415<DD><CODE><A HREF="../../../com/rabbitmq/client/ShutdownSignalException.html" title="class in com.rabbitmq.client">ShutdownSignalException</A></CODE> - if the connection is shut down while waiting
416<DD><CODE><A HREF="../../../com/rabbitmq/client/ConsumerCancelledException.html" title="class in com.rabbitmq.client">ConsumerCancelledException</A></CODE> - if this consumer is cancelled while waiting</DL>
417</DD>
418</DL>
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