Writing a service

There are two phases in writing a service:

The definition phase, when the requirements of the managed resource are defined.
The implementation phase, when the actual software components for the service are developed and tested.

Defining a service

To define a service:

Step	Description	See...
1	Understand the managed resource and how to best interact with it.	Understanding the managed resource
2	Design an interface (a set of API function calls and their associated errors, events, and reasons).	Defining the API Defining events and reasons Defining errors Defining parameters
3	Determine the tracing capability for debugging purposes.	Defining tracing

Step

Description

See...

Understand the managed resource and how to best interact with it.

Design an interface (a set of API function calls and their associated errors, events, and reasons).

Determine the tracing capability for debugging purposes.

To implement a service:

Step	Description	See...
1	Write the service API.	API implementation overview
2	Write the service SPI.	SPI implementation overview
3	Implement the service manager functions for initialization and shut down.	Registering services Initializing managed resource event handling Starting services Shutting down event handling Shutting down services
4	Implement the service manager functions for command and event processing.	Command processing Event processing
5	Implement the service manager functions for tracing and error handling.	Error handling Trace handling
6	Implement the service functions that interact with the managed resource.	Implementing service functions