Programming Jabber

Component Types

The relationship between jabberd and the components is shown in Figure 4-1. These components are the engines that serve and process XML messages, providing their services, and jabberd is the backbone along which messages are routed.

Figure 4-1. jabberd and the components

As seen in Figure 4-1, the jabberd backbone acts as the central artery or hub, managing the peripheral that are attached to it. The management of these components encompasses controlling and overseeing how they connect and coordinatingthe flow of data between them. Certain types of components receive only certain types of data. There is a distinction made between three different types of component:

• log

• xdb

• service

The different component types handle different types of data packets. Each packet is in the form of a distinct, fully formed XML fragment and is identified by the outermost element name in the XML fragment. This element name is matched up to a particular component type.