ts-events
Version:
Various EventEmitter event replacements with synchronous, a-synchronous, and queued events. Made in TypeScript so usable with JavaScript and TypeScript.
217 lines • 23.6 kB
JavaScript
// Copyright © 2015 Rogier Schouten<github@workingcode.ninja>
// License: ISC
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.ErrorAsyncEvent = exports.VoidAsyncEvent = exports.AsyncEvent = void 0;
var base_event_1 = require("./base-event");
var sync_event_1 = require("./sync-event");
/**
* A-synchronous event. Handlers are called in the next Node.JS cycle.
* - Optionally condenses multiple post() calls into one (the last post() gets through)
* - Handlers are called only for events posted after they were attached.
* - Handlers are not called anymore when they are detached, even if a post() is in progress
*/
var AsyncEvent = /** @class */ (function (_super) {
__extends(AsyncEvent, _super);
/**
* Constructor
* @param opts Optional. Various settings:
* - condensed: a Boolean indicating whether to condense multiple post() calls within the same cycle.
*/
function AsyncEvent(opts) {
if (opts === void 0) { opts = {}; }
var _this = _super.call(this) || this;
_this._queued = false;
_this.options = opts;
if (typeof opts.condensed === 'boolean') {
_this._condensed = opts.condensed;
}
else {
_this._condensed = false;
}
return _this;
}
Object.defineProperty(AsyncEvent.prototype, "evtListenersChanged", {
/**
* Sent when someone attaches or detaches
*/
get: function () {
if (!this._listenersChanged) {
// need to delay-load to avoid stack overflow in constructor
this._listenersChanged = new sync_event_1.VoidSyncEvent();
}
return this._listenersChanged;
},
enumerable: false,
configurable: true
});
/**
* The default scheduler uses setImmediate() or setTimeout(..., 0) if setImmediate is not available.
*/
AsyncEvent.defaultScheduler = function (callback) {
/* istanbul ignore else */
if (typeof window !== 'undefined') {
// browsers don't always support setImmediate()
setTimeout(callback, 0);
}
else {
// node.js
setImmediate(callback);
}
};
/**
* By default, AsyncEvent uses setImmediate() to schedule event handler invocation.
* You can change this for e.g. setTimeout(..., 0) by calling this static method once.
* @param scheduler A function that takes a callback and executes it in the next Node.JS cycle.
*/
AsyncEvent.setScheduler = function (scheduler) {
AsyncEvent._scheduler = scheduler;
};
AsyncEvent.prototype.post = function () {
var _this = this;
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
if (!this._listeners || this._listeners.length === 0) {
return;
}
if (this._condensed) {
this._queuedData = args;
this._queuedListeners = this._listeners;
if (this._queued) {
return;
}
else {
this._queued = true;
AsyncEvent._scheduler(function () {
// immediately mark non-queued to allow new AsyncEvent to happen as result
// of calling handlers
_this._queued = false;
// cache listeners and data because they might change while calling event handlers
var data = _this._queuedData;
var listeners = _this._queuedListeners;
for (var i = 0; i < listeners.length; ++i) {
var listener = listeners[i];
_this._call(listener, data);
}
});
}
}
else { // not condensed
var listeners_1 = this._listeners;
AsyncEvent._scheduler(function () {
for (var i = 0; i < listeners_1.length; ++i) {
var listener = listeners_1[i];
_this._call(listener, args);
}
});
}
};
// inherited
AsyncEvent.prototype._call = function (listener, args) {
// performance optimization: don't use consecutive nodejs cycles
// for asyncevents attached to asyncevents
if (listener.event && listener.event instanceof AsyncEvent) {
listener.event._postDirect(args);
}
else {
_super.prototype._call.call(this, listener, args);
}
};
/**
* Performance optimization: if this async signal is attached to another
* async signal, we're already a the next cycle and we can call listeners
* directly
*/
AsyncEvent.prototype._postDirect = function (args) {
if (!this._listeners || this._listeners.length === 0) {
return;
}
// copy a reference to the array because this._listeners might be replaced during
// the handler calls
var listeners = this._listeners;
for (var i = 0; i < listeners.length; ++i) {
var listener = listeners[i];
this._call(listener, args);
}
};
/** @inheritdoc */
AsyncEvent.prototype._attach = function (a, b, once) {
var _a, _b, _c, _d;
var count = (_b = (_a = this._listeners) === null || _a === void 0 ? void 0 : _a.length) !== null && _b !== void 0 ? _b : 0;
var result = _super.prototype._attach.call(this, a, b, once);
if (this.evtListenersChanged && count !== ((_d = (_c = this._listeners) === null || _c === void 0 ? void 0 : _c.length) !== null && _d !== void 0 ? _d : 0)) {
this.evtListenersChanged.post();
}
return result;
};
/** @inheritdoc */
AsyncEvent.prototype._detach = function () {
var _a, _b, _c, _d;
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
var count = (_b = (_a = this._listeners) === null || _a === void 0 ? void 0 : _a.length) !== null && _b !== void 0 ? _b : 0;
var result = _super.prototype._detach.apply(this, args);
if (this.evtListenersChanged && count !== ((_d = (_c = this._listeners) === null || _c === void 0 ? void 0 : _c.length) !== null && _d !== void 0 ? _d : 0)) {
this.evtListenersChanged.post();
}
return result;
};
/**
* The current scheduler
*/
AsyncEvent._scheduler = AsyncEvent.defaultScheduler;
return AsyncEvent;
}(base_event_1.BaseEvent));
exports.AsyncEvent = AsyncEvent;
/**
* Convenience class for AsyncEvents without data
*/
var VoidAsyncEvent = /** @class */ (function (_super) {
__extends(VoidAsyncEvent, _super);
function VoidAsyncEvent() {
return _super !== null && _super.apply(this, arguments) || this;
}
/**
* Send the AsyncEvent.
*/
VoidAsyncEvent.prototype.post = function () {
_super.prototype.post.call(this, undefined);
};
return VoidAsyncEvent;
}(AsyncEvent));
exports.VoidAsyncEvent = VoidAsyncEvent;
/**
* Similar to 'error' event on EventEmitter: throws when a post() occurs while no handlers set.
*/
var ErrorAsyncEvent = /** @class */ (function (_super) {
__extends(ErrorAsyncEvent, _super);
function ErrorAsyncEvent() {
return _super !== null && _super.apply(this, arguments) || this;
}
ErrorAsyncEvent.prototype.post = function (data) {
if (this.listenerCount() === 0) {
throw new Error("error event posted while no listeners attached. Error: " + data.message);
}
_super.prototype.post.call(this, data);
};
return ErrorAsyncEvent;
}(AsyncEvent));
exports.ErrorAsyncEvent = ErrorAsyncEvent;
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Handlers are called in the next Node.JS cycle.\n * - Optionally condenses multiple post() calls into one (the last post() gets through)\n * - Handlers are called only for events posted after they were attached.\n * - Handlers are not called anymore when they are detached, even if a post() is in progress\n */\nexport class AsyncEvent<T> extends BaseEvent<T> implements Postable<T> {\n    /**\n     * Sent when someone attaches or detaches\n     */\n    public get evtListenersChanged(): VoidSyncEvent {\n        if (!this._listenersChanged) {\n            // need to delay-load to avoid stack overflow in constructor\n            this._listenersChanged = new VoidSyncEvent();\n        }\n        return this._listenersChanged;\n    }\n\n    /**\n     * Event for listening to listener count\n     */\n    private _listenersChanged?: VoidSyncEvent;\n\n    /**\n     * Used internally - the exact options object given to constructor\n     */\n    public options: AsyncEventOpts;\n\n    private _condensed: boolean;\n    private _queued: boolean = false;\n    private _queuedListeners: Listener<T>[];\n    private _queuedData: any[];\n\n    /**\n     * The default scheduler uses setImmediate() or setTimeout(..., 0) if setImmediate is not available.\n     */\n    public static defaultScheduler(callback: () => void): void {\n        /* istanbul ignore else  */\n        if (typeof window !== 'undefined') {\n            // browsers don't always support setImmediate()\n            setTimeout(callback, 0);\n        } else {\n            // node.js\n            setImmediate(callback);\n        }\n    }\n\n    /**\n     * The current scheduler\n     */\n    private static _scheduler: (callback: () => void) => void = AsyncEvent.defaultScheduler;\n\n    /**\n     * By default, AsyncEvent uses setImmediate() to schedule event handler invocation.\n     * You can change this for e.g. setTimeout(..., 0) by calling this static method once.\n     * @param scheduler A function that takes a callback and executes it in the next Node.JS cycle.\n     */\n    public static setScheduler(scheduler: (callback: () => void) => void): void {\n        AsyncEvent._scheduler = scheduler;\n    }\n\n    /**\n     * Constructor\n     * @param opts Optional. Various settings:\n     *             - condensed: a Boolean indicating whether to condense multiple post() calls within the same cycle.\n     */\n    constructor(opts: AsyncEventOpts = {}) {\n        super();\n        this.options = opts;\n        if (typeof opts.condensed === 'boolean') {\n            this._condensed = opts.condensed;\n        } else {\n            this._condensed = false;\n        }\n    }\n\n    /**\n     * Send the AsyncEvent. Handlers are called in the next Node.JS cycle.\n     */\n    public post(data: T): void;\n    public post(...args: any[]): void {\n        if (!this._listeners || this._listeners.length === 0) {\n            return;\n        }\n        if (this._condensed) {\n            this._queuedData = args;\n            this._queuedListeners = this._listeners;\n            if (this._queued) {\n                return;\n            } else {\n                this._queued = true;\n                AsyncEvent._scheduler((): void => {\n                    // immediately mark non-queued to allow new AsyncEvent to happen as result\n                    // of calling handlers\n                    this._queued = false;\n                    // cache listeners and data because they might change while calling event handlers\n                    const data = this._queuedData;\n                    const listeners = this._queuedListeners;\n                    for (let i = 0; i < listeners.length; ++i) {\n                        const listener = listeners[i];\n                        this._call(listener, data);\n                    }\n                });\n            }\n        } else { // not condensed\n            const listeners = this._listeners;\n            AsyncEvent._scheduler((): void => {\n                for (let i = 0; i < listeners.length; ++i) {\n                    const listener = listeners[i];\n                    this._call(listener, args);\n                }\n            });\n        }\n    }\n\n    // inherited\n    protected _call(listener: Listener<T>, args: any[]): void {\n        // performance optimization: don't use consecutive nodejs cycles\n        // for asyncevents attached to asyncevents\n        if (listener.event && listener.event instanceof AsyncEvent) {\n            (<AsyncEvent<T>>listener.event)._postDirect(args);\n        } else {\n            super._call(listener, args);\n        }\n    }\n\n    /**\n     * Performance optimization: if this async signal is attached to another\n     * async signal, we're already a the next cycle and we can call listeners\n     * directly\n     */\n    protected _postDirect(args: any[]): void {\n        if (!this._listeners || this._listeners.length === 0) {\n            return;\n        }\n        // copy a reference to the array because this._listeners might be replaced during\n        // the handler calls\n        const listeners = this._listeners;\n        for (let i = 0; i < listeners.length; ++i) {\n            const listener = listeners[i];\n            this._call(listener, args);\n        }\n    }\n\n    /** @inheritdoc */\n    protected _attach(a: ((data: T) => void) | Object | Postable<T>, b: ((data: T) => void) | undefined, once: boolean): () => void {\n        const count = this._listeners?.length ?? 0;\n        const result = super._attach(a, b, once);\n        if (this.evtListenersChanged && count !== (this._listeners?.length ?? 0)) {\n            this.evtListenersChanged.post();\n        }\n        return result;\n    }\n\n    /** @inheritdoc */\n    protected _detach(...args: any[]): void {\n        const count = this._listeners?.length ?? 0;\n        const result = super._detach(...args);\n        if (this.evtListenersChanged && count !== (this._listeners?.length ?? 0)) {\n            this.evtListenersChanged.post();\n        }\n        return result;\n    }\n}\n\n/**\n * Convenience class for AsyncEvents without data\n */\nexport class VoidAsyncEvent extends AsyncEvent<void> {\n\n    /**\n     * Send the AsyncEvent.\n     */\n    public post(): void {\n        super.post(undefined);\n    }\n}\n\n/**\n * Similar to 'error' event on EventEmitter: throws when a post() occurs while no handlers set.\n */\nexport class ErrorAsyncEvent extends AsyncEvent<Error> {\n\n    public post(data: Error): void {\n        if (this.listenerCount() === 0) {\n            throw new Error(`error event posted while no listeners attached. Error: ${data.message}`);\n        }\n        super.post(data);\n    }\n}\n"]}