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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
// @ts-check
/**
* @typedef {import("../../@types/perf").PerfFront} PerfFront
* @typedef {import("../../@types/perf").RecordingState} RecordingState
* @typedef {import("../../@types/perf").State} StoreState
* @typedef {import("../../@types/perf").RootTraits} RootTraits
* @typedef {import("../../@types/perf").PanelWindow} PanelWindow
*/
/**
* @template P
* @typedef {import("react-redux").ResolveThunks<P>} ResolveThunks<P>
*/
/**
* @typedef {Object} StateProps
* @property {RecordingState} recordingState
* @property {boolean?} isSupportedPlatform
*/
/**
* @typedef {Object} ThunkDispatchProps
* @property {typeof actions.reportProfilerReady} reportProfilerReady
* @property {typeof actions.reportProfilerStarted} reportProfilerStarted
* @property {typeof actions.reportProfilerStopped} reportProfilerStopped
*/
/**
* @typedef {Object} OwnProps
* @property {PerfFront} perfFront
* @property {RootTraits} traits
*/
/**
* @typedef {ResolveThunks<ThunkDispatchProps>} DispatchProps
* @typedef {StateProps & DispatchProps & OwnProps} Props
*/
"use strict";
const {
PureComponent,
const {
connect,
/**
* This component state changes for the performance recording. e.g. If the profiler
* suddenly becomes unavailable, it needs to react to those changes, and update the
* recordingState in the store.
*
* @extends {React.PureComponent<Props>}
*/
class ProfilerEventHandling extends PureComponent {
componentDidMount() {
const {
perfFront,
isSupportedPlatform,
reportProfilerReady,
reportProfilerStarted,
reportProfilerStopped,
} = this.props;
if (!isSupportedPlatform) {
return;
}
// Ask for the initial state of the profiler.
perfFront.isActive().then(isActive => reportProfilerReady(isActive));
// Handle when the profiler changes state. It might be us, it might be someone else.
this.props.perfFront.on("profiler-started", reportProfilerStarted);
this.props.perfFront.on("profiler-stopped", reportProfilerStopped);
}
componentWillUnmount() {
switch (this.props.recordingState) {
case "not-yet-known":
case "available-to-record":
case "request-to-stop-profiler":
case "request-to-get-profile-and-stop-profiler":
// Do nothing for these states.
break;
case "recording":
case "request-to-start-recording":
this.props.perfFront.stopProfilerAndDiscardProfile();
break;
default:
throw new Error("Unhandled recording state.");
}
}
render() {
return null;
}
}
/**
* @param {StoreState} state
* @returns {StateProps}
*/
function mapStateToProps(state) {
return {
recordingState: selectors.getRecordingState(state),
isSupportedPlatform: selectors.getIsSupportedPlatform(state),
};
}
/** @type {ThunkDispatchProps} */
const mapDispatchToProps = {
reportProfilerReady: actions.reportProfilerReady,
reportProfilerStarted: actions.reportProfilerStarted,
reportProfilerStopped: actions.reportProfilerStopped,
};
module.exports = connect(
mapStateToProps,
mapDispatchToProps
)(ProfilerEventHandling);