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From conflue...@apache.org
Subject [CONF] Apache Camel > Multicast
Date Wed, 15 Jul 2009 08:36:00 GMT
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     <h2><a href="http://cwiki.apache.org/confluence/display/CAMEL/Multicast">Multicast</a></h2>
     <h4>Page <b>edited</b> by             <a href="http://cwiki.apache.org/confluence/display/~davsclaus">Claus
Ibsen</a>
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         <h3><a name="Multicast-Multicast"></a>Multicast</h3>
<p>The Multicast allows to route the same message to a number of endpoints and process
them in a different way. The main difference between the Multicast and Splitter is that Splitter
will split the message into several pieces but the Multicast will not modify the request message.</p>

<h4><a name="Multicast-Example"></a>Example</h4>

<p>The following example shows how to take a request from the <b>direct:a</b>
endpoint , then multicast these request to <b>direct:x</b>, <b>direct:y</b>,
<b>direct:z</b>.</p>

<p><b>Using the <a href="/confluence/display/CAMEL/Fluent+Builders" title="Fluent
Builders">Fluent Builders</a></b></p>
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<textarea name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">from("direct:a").multicast().to("direct:x",
"direct:y", "direct:z");</textarea>
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<p>If you want to aggregate the whatever the incoming messages or outgoing messages
within the <b>multicast</b>, here is an example</p>

<p><b>Using the <a href="/confluence/display/CAMEL/Fluent+Builders" title="Fluent
Builders">Fluent Builders</a></b></p>
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<textarea name="newcodemacro" class="java:nocontrols:nogutter" rows="10" readonly="readonly">//
The message will be sent parallelly to the endpoints
from("direct:parallel")
    .multicast(new BodyOutAggregatingStrategy(), true).executorService(tpExecutor)
        .to("direct:x", "direct:y", "direct:z");
// Multicast the message in a sequential way
from("direct:sequential").multicast(new BodyOutAggregatingStrategy()).to("direct:x", "direct:y",
"direct:z");

from("direct:x").process(new AppendingProcessor("x")).to("direct:aggregator");
from("direct:y").process(new AppendingProcessor("y")).to("direct:aggregator");
from("direct:z").process(new AppendingProcessor("z")).to("direct:aggregator");

from("direct:aggregator").aggregate(header("cheese"), new BodyInAggregatingStrategy()).
        completionPredicate(property(Exchange.AGGREGATED_SIZE).isEqualTo(3)).to("mock:result");</textarea>
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<p>For further examples of this pattern in use you could look at one of the <a href="http://svn.apache.org/viewvc/camel/trunk/camel-core/src/test/java/org/apache/camel/processor/MultiCastAggregatorTest.java?view=markup"
rel="nofollow">junit test case</a></p>

<h4><a name="Multicast-UsingThisPattern"></a>Using This Pattern</h4>

<p>If you would like to use this EIP Pattern then please read the <a href="/confluence/display/CAMEL/Getting+Started"
title="Getting Started">Getting Started</a>, you may also find the <a href="/confluence/display/CAMEL/Architecture"
title="Architecture">Architecture</a> useful particularly the description of <a
href="/confluence/display/CAMEL/Endpoint" title="Endpoint">Endpoint</a> and <a
href="/confluence/display/CAMEL/URIs" title="URIs">URIs</a>. Then you could try out
some of the <a href="/confluence/display/CAMEL/Examples" title="Examples">Examples</a>
first before trying this pattern out.</p> 

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