Stefan Hacker
28 lines
938 B
JavaScript
28 lines
938 B
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.mutex = mutex;
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const codeMutex_1 = require("./codeMutex");
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/* tslint:disable no-invalid-this */
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/**
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* Executes only one instance of give code at a time. For parallel calls, it
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* returns the result of the ongoing execution.
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*/
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function mutex(fn, context) {
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const isDecorator = !!context;
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if (!isDecorator) {
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const mut = (0, codeMutex_1.codeMutex)();
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return async function (...args) {
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return await mut(async () => await fn.call(this, ...args));
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};
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}
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const instances = new WeakMap();
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return async function (...args) {
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let map = instances.get(this);
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if (!map)
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instances.set(this, (map = new WeakMap()));
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if (!map.has(fn))
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map.set(fn, (0, codeMutex_1.codeMutex)());
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return await map.get(fn)(async () => await fn.call(this, ...args));
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};
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}
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