<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">Based on Ben and Alexis's discussion, I came up with the following logic. Let me know if you guys see any flaw in it. I use two exchanges; one for one-to-one chat and another for multi-user chat. Clients will use Java. I create one queue per user. Effectively, there will be two queues per chat. <br><br><br><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><meta name="ProgId" content="Word.Document"><meta name="Generator" content="Microsoft Word 11"><meta name="Originator" content="Microsoft Word 11"><link rel="File-List" href="file:///C:%5CDOCUME%7E1%5CMRAMAM%7E1%5CLOCALS%7E1%5CTemp%5Cmsohtml1%5C01%5Cclip_filelist.xml"><!--[if gte mso 9]><xml>
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<p class="MsoNormal"><b style=""><u>One-to-one chat:<o:p></o:p></u></b></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When the user wants to send the message use SimpleProducer
class. For every 10 seconds, run SimpleConsumer class to see if there are any
messages in the queue.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>SimpleProducer:<o:p></o:p></u></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Publish the message in the window with the user’s name </p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Connect to channel</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Declare exchange named “direct”</p>
<p class="MsoNormal">Create queuename equivalent to the friend’s user name. </p>
<p class="MsoNormal">Routing key is the same as the queuename.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Do channel..basicPublish to publish the message to the
friend.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If message is not acknowledged, show error as
“<friendname> is offline”.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>SimpleConsumer:<o:p></o:p></u></p>
<p class="MsoNormal"><u><o:p><span style="text-decoration: none;"><br></span></o:p></u></p>
<p class="MsoNormal">Set noAck to false</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Do channel.basicGet for the queuename “<username>”</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If message is received successfully, do channel.basicAck to
acknowledge the receipt of the message.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Publish the incoming message with the friend’s name</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b style=""><u>Multi-user chat:<o:p></o:p></u></b></p>
<p class="MsoNormal">When the user wants to send the message use
SimpleProducerMulti class. For every 10 seconds, run SimpleConsumerMulti class
to see if there are any messages in the queue.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>SimpleProducerMulti:<o:p></o:p></u></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Connect to channel</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Declare exchange named “multiuser”</p>
<p class="MsoNormal">Create queuename as “multiuserqueue”</p>
<p class="MsoNormal">Routing key is the same as the queuename.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Do channel.basicPublish to publish the message to
multiuserqueue.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If message is not acknowledged, show error as “server is
offline”.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><u>SimpleConsumerMulti:<o:p></o:p></u></p>
<p class="MsoNormal"><u><o:p><span style="text-decoration: none;"><br></span></o:p></u></p>
<p class="MsoNormal">Set noAck to false</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Use QueueingConsumer class </p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Do channel.basicConsume for the queuename “<username>”</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If message is received successfully, do channel.basicAck to
acknowledge the receipt of the message.</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Publish the incoming message with the author’s name.</p>
<br><br>-- Thanks, Ram<br></div><br>
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