ts-events
Version:
Various EventEmitter event replacements with synchronous, a-synchronous, and queued events. Made in TypeScript so usable with JavaScript and TypeScript.
142 lines • 14.4 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.ErrorSyncEvent = exports.VoidSyncEvent = exports.SyncEvent = void 0;
var base_event_1 = require("./base-event");
/**
* This is a true EventEmitter replacement: the handlers are called synchronously when
* you post the event.
* - Allows better error handling by aggregating any errors thrown by handlers.
* - Prevents livelock by throwing an error when recursion depth is above a maximum.
* - 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 SyncEvent = /** @class */ (function (_super) {
__extends(SyncEvent, _super);
function SyncEvent() {
var _this = _super !== null && _super.apply(this, arguments) || this;
/**
* Recursive post() invocations
*/
_this._recursion = 0;
return _this;
}
Object.defineProperty(SyncEvent.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 VoidSyncEvent();
}
return this._listenersChanged;
},
enumerable: false,
configurable: true
});
SyncEvent.prototype.post = function () {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
if (!this._listeners || this._listeners.length === 0) {
return;
}
this._recursion++;
if (typeof SyncEvent.MAX_RECURSION_DEPTH === 'number'
&& Number.isInteger(SyncEvent.MAX_RECURSION_DEPTH)
&& SyncEvent.MAX_RECURSION_DEPTH > 0
&& this._recursion > SyncEvent.MAX_RECURSION_DEPTH) {
throw new Error('event fired recursively');
}
// 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);
}
this._recursion--;
};
/** @inheritdoc */
SyncEvent.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 */
SyncEvent.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;
};
/**
* Maximum number of times that an event handler may cause the same event
* recursively.
*/
SyncEvent.MAX_RECURSION_DEPTH = 10;
return SyncEvent;
}(base_event_1.BaseEvent));
exports.SyncEvent = SyncEvent;
/**
* Convenience class for events without data
*/
var VoidSyncEvent = /** @class */ (function (_super) {
__extends(VoidSyncEvent, _super);
function VoidSyncEvent() {
return _super !== null && _super.apply(this, arguments) || this;
}
/**
* Send the event.
*/
VoidSyncEvent.prototype.post = function () {
_super.prototype.post.call(this, undefined);
};
return VoidSyncEvent;
}(SyncEvent));
exports.VoidSyncEvent = VoidSyncEvent;
/**
* Similar to 'error' event on EventEmitter: throws when a post() occurs while no handlers set.
*/
var ErrorSyncEvent = /** @class */ (function (_super) {
__extends(ErrorSyncEvent, _super);
function ErrorSyncEvent() {
return _super !== null && _super.apply(this, arguments) || this;
}
ErrorSyncEvent.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 ErrorSyncEvent;
}(SyncEvent));
exports.ErrorSyncEvent = ErrorSyncEvent;
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Handlers are called immediately and synchronously.\n     * If an error is thrown by a handler, the remaining handlers are still called.\n     * Afterward, an AggregateError is thrown with the original error(s) in its 'causes' property.\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        this._recursion++;\n        if (\n            typeof SyncEvent.MAX_RECURSION_DEPTH === 'number'\n            && Number.isInteger(SyncEvent.MAX_RECURSION_DEPTH)\n            && SyncEvent.MAX_RECURSION_DEPTH > 0\n            && this._recursion > SyncEvent.MAX_RECURSION_DEPTH\n        ) {\n            throw new Error('event fired recursively');\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        this._recursion--;\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 events without data\n */\nexport class VoidSyncEvent extends SyncEvent<void> {\n\n    /**\n     * Send the event.\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 ErrorSyncEvent extends SyncEvent<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"]}