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58 lines
2.9 KiB
Markdown
58 lines
2.9 KiB
Markdown
Processing Incoming Packets
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===========================
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[Back](index.html)
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Smack provides a flexible framework for processing incoming packets using two
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constructs:
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* `org.jivesoftware.smack.PacketCollector` -- a class that lets you synchronously wait for new packets.
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* `org.jivesoftware.smack.PacketListener` -- an interface for asynchronously notifying you of incoming packets. A packet listener is used for event style programming, while a packet collector has a result queue of packets that you can do polling and blocking operations on. So, a packet listener is useful when you want to take some action whenever a packet happens to come in, while a packet collector is useful when you want to wait for a specific packet to arrive. Packet collectors and listeners can be created using an `XMPPConnection` instance.
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The `org.jivesoftware.smack.filter.PacketFilter` interface determines which
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specific packets will be delivered to a `PacketCollector` or `PacketListener`.
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Many pre-defined filters can be found in the `org.jivesoftware.smack.filter`
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package.
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The following code snippet demonstrates registering both a packet collector
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and a packet listener:
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```
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// Create a packet filter to listen for new messages from a particular
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// user. We use an AndFilter to combine two other filters._
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PacketFilter filter = new AndFilter(new PacketTypeFilter(Message.class),
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new FromContainsFilter("mary@jivesoftware.com"));
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// Assume we've created a XMPPConnection name "connection".
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// First, register a packet collector using the filter we created.
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PacketCollector myCollector = connection.createPacketCollector(filter);
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// Normally, you'd do something with the collector, like wait for new packets.
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// Next, create a packet listener. We use an anonymous inner class for brevity.
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PacketListener myListener = new PacketListener() {
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**public** **void** processPacket(Packet packet) {
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// Do something with the incoming packet here._
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}
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};
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// Register the listener._
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connection.addPacketListener(myListener, filter);
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```
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Standard Packet Filters
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-----------------------
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A rich set of packet filters are included with Smack, or you can create your
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own filters by coding to the `PacketFilter` interface. The default set of
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filters includes:
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* `PacketTypeFilter` -- filters for packets that are a particular Class type.
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* `PacketIDFilter` -- filters for packets with a particular packet ID.
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* `ThreadFilter` -- filters for message packets with a particular thread ID.
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* `ToContainsFilter` -- filters for packets that are sent to a particular address.
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* `FromContainsFilter` -- filters for packets that are sent to a particular address.
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* `PacketExtensionFilter` -- filters for packets that have a particular packet extension.
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* `AndFilter` -- implements the logical AND operation over two filters.
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* `OrFilter` -- implements the logical OR operation over two filters.
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* `NotFilter` -- implements the logical NOT operation on a filter.
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Copyright (C) Jive Software 2002-2008
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