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## org.jivesoftware.openfire.handler
Class PresenceSubscribeHandler

    java.lang.Object
      org.jivesoftware.openfire.container.BasicModule
          org.jivesoftware.openfire.handler.PresenceSubscribeHandler

All Implemented Interfaces:
  ChannelHandler<org.xmpp.packet.Presence>, Module

    public class PresenceSubscribeHandler

extends BasicModule
implements ChannelHandler<org.xmpp.packet.Presence>

Implements the presence protocol. Clients use this protocol to update presence and roster information.

The handler must properly detect the presence type, update the user's roster, and inform presence subscribers of the session's updated presence status. Presence serves many purposes in Jabber so this handler will likely be the most complex of all handlers in the server.

There are four basic types of presence updates:

- Simple presence updates - addressed to the server (or to address), these updates are properly addressed by the server, and multicast to interested subscribers on the user's roster. An empty, missing, or "unavailable" type attribute indicates a simple update (there is no "available" type although it should be accepted by the server.
- Directed presence updates - addressed to particular jabber entities, these presence updates are properly addressed and directly delivered to the entity without broadcast to roster subscribers. Any update type is possible except those reserved for subscription requests.
- Subscription requests - these updates request presence subscription status changes. Such requests always affect the roster. The server must:
  - update the roster with the proper subscriber info
  - push the roster changes to the user
  - forward the update to the correct parties.
  The valid types include "subscribe", "subscribed", "unsubscribed", and "unsubscribe".
- XMPPServer probes - Provides a mechanism for servers to query the presence status of users on another server. This allows users to immediately know the presence status of users when they come online rather than way for a presence update broadcast from the other server or tracking them as they are received. Requires S2S capabilities.

## Warning

There should be a way of determining whether a session has authorization to access this feature. I'm not sure it is a good idea to do authorization in each handler. It would be nice if the framework could assert authorization policies across channels.

Author:
  Iain Shigeoka

Constructor Summary
`PresenceSubscribeHandler()`

Method Summary
`void` | `initialize(XMPPServer server)` Initializes the basic module.
`void` | `process(org.xmpp.packet.Presence presence)` Process an XMPP packet.

Methods inherited from class org.jivesoftware.openfire.container.BasicModule
`destroy, getName, start, stop`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### PresenceSubscribeHandler

    public PresenceSubscribeHandler()

Method Detail

### process

    public void process(org.xmpp.packet.Presence presence)
                 throws PacketException

  Description copied from interface: `ChannelHandler`
  Process an XMPP packet.

  Specified by:
    `process` in interface `ChannelHandler<org.xmpp.packet.Presence>`
  Parameters:
    `presence` - a packet to process.
  Throws:
    `PacketException` - thrown if the packet is malformed (results in the sender's session being shutdown).

### initialize

    public void initialize(XMPPServer server)

  Description copied from class: `BasicModule`

  Initializes the basic module.

  Inheriting classes that choose to override this method MUST call this initialize() method before accessing BasicModule resources.

  Specified by:
    `initialize` in interface `Module`
  Overrides:
    `initialize` in class `BasicModule`
  Parameters:
    `server` - the server hosting this module.

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