If the service implementation has an init method with 1 or 2 message context as its parameters, then
the DependencyManager calls the init method with appropriate parameters.
A Handler represents a piece of message processing functionality in Axis2.
Handlers are combined into chains and phases in order to provide customizable functionality
such as security, reliability, etc.
By the time the control comes to this handler, the dispatching must have happened
so that the message context contains the AxisServiceGroup, AxisService and
AxisOperation.