Event Manager

The Evm Daemon (evmd) - Receives events from posting clients and distributes them to the subscribing clients, that is, clients that have subscribed for the events.

The Evm Logger - Receives events from the daemon and writes them to each of the logs if the filter string matches. The evmlogger command also serves as an event forwarding agent that you can configure to take an action when required. The Event Manager daemon automatically starts the logger.

The Evm Channel Manager - Executes the periodic functions defined for any channel. The Event Manager daemon starts the channel manager (evmchmgr) automatically.

The Evm Command Line Utilities - Event Manager provides command line utilities to administer the Event Manager system and to post or obtain events.

The Evm Application Programming Interface - Event Manager API library, libevm.so, contains an extensive range of event management functions. The API functions enable programs to post events, send requests and notifications to the daemon, or receive responses and information from the daemon.

evmpost - Accepts a file or a stream of events in text format, and posts them to the Event Manager daemon for distribution

evmshow - Accepts one or more Event Manager events and outputs them in the specified format

evmsort - Reads a stream of events, and sorts the events according to the specified criteria

evmwatch - Subscribes to the specified events and outputs them as they arrive

evmget - Retrieves stored events from a configured set of log files and event channels, using channel-specific retrieval functions

evmreload - Posts control events, which instruct the Event Manager components to reload the configuration files. You must use this command to load the new configuration, when you modify any EVM configuration file.

Enables users and applications to post, receive, store, retrieve, and monitor events

Supports creation and customization of event channels

Facilitates users to select summary or detailed event data

Provides users with a full set of command line utilities that can be used to post and handle events from the command line

Supports configurable event logger that enables you to control event logging

Supports configurable event forwarding that enables you to automatically notify other system entities of selected events

Supports configurable authorization for posting or accessing events

Supports log file management that automatically archives and purges log files

Provides application programming interface (API) library for programmers to handle events