mirror of
https://github.com/vanitasvitae/Smack.git
synced 2024-11-27 22:42:06 +01:00
59 lines
3 KiB
Markdown
59 lines
3 KiB
Markdown
Processing Incoming Stanzas
|
|
===========================
|
|
|
|
[Back](index.md)
|
|
|
|
Smack provides a flexible framework for processing incoming stanzas using two
|
|
constructs:
|
|
|
|
* `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 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 stanza collector
|
|
and a stanza listener:
|
|
|
|
```
|
|
// 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(StanzaTypeFilter.Message, FromMatchesFilter.create("mary@jivesoftware.com"));
|
|
// Assume we've created an XMPPConnection named "connection".
|
|
|
|
// 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 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.addAsyncStanzaListener(myListener, filter);
|
|
// or for a synchronous stanza listener use
|
|
connection.addSyncStanzaListener(myListener, filter);
|
|
```
|
|
|
|
Standard Stanza Filters
|
|
-----------------------
|
|
|
|
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 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.
|
|
|
|
Copyright (C) Jive Software 2002-2008
|