pool.js
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"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
Object.defineProperty(exports, "__esModule", { value: true });
function createPool(size) {
let pendingPromises = [];
const pool = {
submit(task) {
return __awaiter(this, void 0, void 0, function* () {
while (pendingPromises.length >= pool.size) {
yield Promise.race(pendingPromises).catch(() => undefined);
}
let resolve;
let reject;
const taskPromise = new Promise((taskResolve, taskReject) => {
resolve = taskResolve;
reject = taskReject;
});
const donePromise = new Promise((doneResolve) => {
task(() => {
doneResolve(undefined);
pendingPromises = pendingPromises.filter((pendingPromise) => pendingPromise !== donePromise);
})
.then(resolve)
.catch(reject);
});
pendingPromises.push(donePromise);
return taskPromise;
});
},
size,
get pending() {
return pendingPromises.length;
},
};
return pool;
}
exports.createPool = createPool;