2003-06-19 20:11:37 +02:00
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<title>Smack: Processing Incoming Packets - Jive Software</title>
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<div class="header">
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Processing Incoming Packets
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« <a href="index.html">Table of Contents</a>
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<p>
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Smack provides a flexible framework for processing incoming packets using two constructs:
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<ul>
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<li><tt>org.jivesoftware.smack.PacketCollector</tt> -- a class that lets you
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synchronously wait for new packets.
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<li><tt>org.jivesoftware.smack.PacketListener</tt> -- an interface for asynchronously
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notifying you of incoming packets.
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</ul>
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A packet listener is used for event style programming, while a packet collector has a
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result queue of packets that you can do polling and blocking operations on. So, a packet
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listener is useful when you want to take some action whenever a packet happens to come in,
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while a packet collector is useful when you want to wait for a specific packet to come
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through. Packet collectors and listeners can be created using an <tt>XMPPConnection</tt> object.<p>
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The <tt>org.jivesoftware.smack.filter.PacketFilter</tt> interface determines which
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specific packets will be delivered to a <tt>PacketCollector</tt> or <tt>PacketListener</tt>.
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Many pre-defined filters can be found in the <tt>org.jivesoftware.smack.filter</tt> package.
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<p>
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The following code snippet demonstrates registering both a packet collector and a packet
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listener:<p>
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<div class="code"><pre>
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<font color="gray"><i>// Create a packet filter to listen for new messages from a particular</i></font>
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<font color="gray"><i>// user. We use an AndFilter to combine two other filters.</i></font>
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2003-07-14 16:10:14 +02:00
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PacketFilter filter = new AndFilter(new PacketTypeFilter(<b>Message.class</b>),
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2003-06-19 20:11:37 +02:00
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new FromContainsFilter(<font color="green">"mary@jivesoftware.com"</font>));
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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<font color="gray"><i>// First, register a packet collector using the filter we created.</i></font>
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PacketCollector myCollector = connection.createPacketCollector(filter);
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<font color="gray"><i>// Normally, you'd do something with the collector, like wait for new packets.</i></font>
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<font color="gray"><i>// Next, create a packet listener. We use an anonymous inner class for brevity.</i></font>
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PacketListener myListener = new PacketListener() {
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<b>public</b> <b>void</b> processPacket(Packet packet) {
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<font color="gray"><i>// Do something with the incoming packet here.</i></font>
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}
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};
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<font color="gray"><i>// Register the listener.</i></font>
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connection.addPacketListener(myListener, filter);
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</pre></div><p>
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<p class="subheader">
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Standard Packet Filters
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</p>
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A rich set of packet filters are included with Smack, or you can create your own filters by coding
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to the <tt>PacketFilter</tt> interface. The default set of filters includes:
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<ul>
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<li> <tt>PacketTypeFilter</tt> -- filters for packets that are a particular Class type.
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<li> <tt>PacketIDFilter</tt> -- filters for packets with a particular packet ID.
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<li> <tt>ThreadFilter</tt> -- filters for message packets with a parituclar thread ID.
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<li> <tt>ToContainsFilter</tt> -- filters for packets that are sent to a particular address.
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<li> <tt>FromContainsFilter</tt> -- filters for packets that are sent to a particular address.
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<li> <tt>PacketExtensionFilter</tt> -- filters for packets that have a particular packet extension.
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<li> <tt>AndFilter</tt> -- implements the logical AND operation over two filters.
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<li> <tt>OrFilter</tt> -- implements the logical OR operation over two filters.
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<li> <tt>NotFilter</tt> -- implements the logical NOT operation on a filter.
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</ul>
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<br clear="all" /><br><br>
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<div class="footer">
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Copyright © Jive Software 2002-2003
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