Ext

const mixin Ext

Extension

methods

houseKeepingFreq	Override to return non-null for onHouseKeeping callback
isRunning	Running flag.
log	Logger to use for this extension
name	Library dotted name that identifies the extension
observables	Return list of observables this extension publishes.
observe	Subscribe this library to an observable.
onHouseKeeping	Callback made periodically to perform background tasks.
onReady	Callback when all libs are fully started.
onSettings	Callback when associated settings are modified.
onStart	Callback when library is started.
onSteadyState	Callback when extension reaches steady state.
onStop	Callback when extension is stopped.
onUnready	Callback before we stop the project This is called on dedicated background actor.
proj	Project if a project extension, otherwise raise exception
rt	Runtime which is proj if project ext or sys if system ext
settings	Settings for the extension
spec	Xeto spec for this extension
subscriptions	Observable subscriptions for this extension
sys	System
web	Web service handling for this extension

Slot Details

houseKeepingFreq

virtual Duration? houseKeepingFreq()

Override to return non-null for onHouseKeeping callback

isRunning

Bool isRunning()

Running flag. On startup this flag transitions to true before calling onStart. On shutdown this flag transitions to false before calling onUnready and onStop. If the onStart callback raises an exception then this flag transitions back to false.

log

Log log()

Logger to use for this extension

name

Str name()

Library dotted name that identifies the extension

observables

virtual Observable[] observables()

Return list of observables this extension publishes. This method must be overridden as a const field and set in the constructor.

observe

Subscription observe(Str name, Dict config, Obj callback)

Subscribe this library to an observable. The callback must be an Actor instance or Method literal on this class. If callback is a method, then its called on the lib's dedicated background actor. pool. This method should be called in the onStart callback. The observation is automatically unsubscribed on stop. You should not unsubscribe this subscription - it must be managed by the extension itself. See Observables.

onHouseKeeping

virtual Void onHouseKeeping()

Callback made periodically to perform background tasks. Override houseKeepingFreq to enable the frequency of this callback.

onReady

virtual Void onReady()

Callback when all libs are fully started. This is called on dedicated background actor.

onSettings

virtual Void onSettings()

Callback when associated settings are modified. This is called on dedicated background actor.

onStart

virtual Void onStart()

Callback when library is started. This is called on dedicated background actor.

onSteadyState

virtual Void onSteadyState()

Callback when extension reaches steady state. This is called on dedicated background actor.

onStop

virtual Void onStop()

Callback when extension is stopped. This is called on dedicated background actor.

onUnready

virtual Void onUnready()

Callback before we stop the project This is called on dedicated background actor.

proj

virtual Proj proj()

Project if a project extension, otherwise raise exception

rt

virtual Runtime rt()

Runtime which is proj if project ext or sys if system ext

settings

virtual Dict settings()

Settings for the extension

spec

Spec spec()

Xeto spec for this extension

subscriptions

Subscription[] subscriptions()

Observable subscriptions for this extension

sys

virtual Sys sys()

System

web

virtual ExtWeb web()

Web service handling for this extension

type

Ext