Event emitter

Defines the event emitter module used throughout the Gen AI applications.

Authors

Henry Wicaksono (henry.wicaksono@gdplabs.id)

References

NONE

`EventEmitter(handlers, event_level=EventLevel.INFO)`

Handles events emitting using event handlers with various levels and types.

The EventEmitter class is responsible for handling and emitting events using a list of event handlers. Events are processed based on their severity level and type, with the option to disable specific handlers.

Attributes:

Name	Type	Description
`handlers`	`list[BaseEventHandler]`	A list of event handlers to process emitted events.
`severity`	`int`	The minimum severity level of events to be processed.

Raises:

Type	Description
`ValueError`	If the event handlers list is empty.
`ValueError`	If an invalid event level is provided.

Initializes a new instance of the EventEmitter class.

Parameters:

Name	Type	Description	Default
`handlers`	`list[BaseEventHandler]`	A list of event handlers to process emitted events.	required
`event_level`	`EventLevel`	The minimum severity level of events to be processed. Defaults to EventLevel.INFO.	`INFO`

`close()` `async`

Closes all handlers in the handler list.

This method iterates through the list of handlers and calls the close method on each handler.

Returns:

Type	Description
`None`	None

`emit(value, event_level=EventLevel.DEBUG, event_type=EventType.STATUS, disabled_handlers=None)` `async`

Emits an event using the event handlers with the specified severity and type.

This method emits an event by creating an Event object with the provided message, severity level, and event type. It then passes the event to the available handlers, unless they are listed in the disabled handlers. The event will only be processed if its severity is greater than or equal to the configured severity level of the EventEmitter.