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@ -3,54 +3,55 @@ Processing Incoming Stanzas
[Back](index.md)
Smack provides a flexible framework for processing incoming packets using two
Smack provides a flexible framework for processing incoming stanzas using two
constructs:
* `org.jivesoftware.smack.PacketCollector` -- a class that lets you synchronously wait for new packets.
* `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.
* `org.jivesoftware.smack.StanzaCollector` -- a class that lets you synchronously wait for new stanzas.
* `org.jivesoftware.smack.StanzaListener` -- an interface for asynchronously notifying you of incoming stanzas. A stanza listener is used for event style programming, while a stanza collector has a result queue of stanzas that you can do polling and blocking operations on. So, a stanza listener is useful when you want to take some action whenever a stanza happens to come in, while a stanza collector is useful when you want to wait for a specific stanza to arrive. Stanza collectors and listeners can be created using an `XMPPConnection` instance.
The `org.jivesoftware.smack.filter.StanzaFilter` interface determines which
specific packets will be delivered to a `PacketCollector` or `PacketListener`.
specific stanzas will be delivered to a `StanzaCollector` or `StanzaListener`.
Many pre-defined filters can be found in the `org.jivesoftware.smack.filter`
package.
The following code snippet demonstrates registering both a packet collector
and a packet listener:
The following code snippet demonstrates registering both a stanza collector
and a stanza listener:
```
// Create a packet filter to listen for new messages from a particular
// Create a stanza filter to listen for new messages from a particular
// user. We use an AndFilter to combine two other filters._
StanzaFilter filter = new AndFilter(new StanzaTypeFilter(Message.class),
new FromContainsFilter("mary@jivesoftware.com"));
// Assume we've created an XMPPConnection name "connection".
StanzaFilter filter = new AndFilter(StanzaTypeFilter.Message, FromMatchesFilter.create("mary@jivesoftware.com"));
// Assume we've created an XMPPConnection named "connection".
// First, register a packet collector using the filter we created.
PacketCollector myCollector = connection.createPacketCollector(filter);
// First, register a stanza collector using the filter we created.
StanzaCollector myCollector = connection.createStanzaCollector(filter);
// Normally, you'd do something with the collector, like wait for new packets.
// Next, create a packet listener. We use an anonymous inner class for brevity.
// Next, create a stanza listener. We use an anonymous inner class for brevity.
StanzaListener myListener = new StanzaListener() {
**public** **void** processStanza(Stanza stanza) {
// Do something with the incoming stanza here._
}
};
// Register the listener._
connection.addStanzaListener(myListener, filter);
connection.addAsyncStanzaListener(myListener, filter);
// or for a synchronous stanza listener use
connection.addSyncStanzaListener(myListener, filter);
```
Standard Stanza Filters
-----------------------
A rich set of packet filters are included with Smack, or you can create your
A rich set of stanza filters are included with Smack, or you can create your
own filters by coding to the `StanzaFilter` interface. The default set of
filters includes:
* `StanzaTypeFilter` -- filters for packets that are a particular Class type.
* `StanzaIdFilter` -- filters for packets with a particular packet ID.
* `ThreadFilter` -- filters for message packets with a particular thread ID.
* `ToContainsFilter` -- filters for packets that are sent to a particular address.
* `FromContainsFilter` -- filters for packets that are sent from a particular address.
* `StanzaExtensionFilter` -- filters for packets that have a particular packet extension.
* `StanzaTypeFilter` -- filters for stanzas that are a particular Class type.
* `StanzaIdFilter` -- filters for stanzas with a particular packet ID.
* `ThreadFilter` -- filters for message stanzas with a particular thread ID.
* `ToMatchesFilter` -- filters for stanzas that are sent to a particular address.
* `FromMatchesFilter` -- filters for stanzas that are sent from a particular address.
* `StanzaExtensionFilter` -- filters for stanzas that have a particular stanza extension.
* `AndFilter` -- implements the logical AND operation over two filters.
* `OrFilter` -- implements the logical OR operation over two filters.
* `NotFilter` -- implements the logical NOT operation on a filter.