@wfh/thread-promise-pool
Version:
2 Node.js utilities: a thread worker pool and a promise queue
122 lines • 9.05 kB
JavaScript
;
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());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.queue = exports.queueUp = void 0;
function queueUp(parallel, actions) {
return __awaiter(this, void 0, void 0, function () {
function performAction() {
return __awaiter(this, void 0, void 0, function () {
var _a, _b, err_1;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
if (!(actionIdx < actions.length)) return [3 /*break*/, 5];
_c.label = 1;
case 1:
_c.trys.push([1, 3, , 4]);
_b = (_a = results).push;
return [4 /*yield*/, actions[actionIdx++]()];
case 2:
_b.apply(_a, [_c.sent()]);
return [3 /*break*/, 4];
case 3:
err_1 = _c.sent();
results.push(err_1);
return [3 /*break*/, 4];
case 4: return [3 /*break*/, 0];
case 5: return [2 /*return*/];
}
});
});
}
var actionIdx, results, done, i;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
actionIdx = 0;
results = [];
done = new Array(parallel);
for (i = 0; i < parallel; i++) {
done[i] = performAction();
}
return [4 /*yield*/, Promise.all(done)];
case 1:
_a.sent();
return [2 /*return*/, results];
}
});
});
}
exports.queueUp = queueUp;
function queue(maxParallel) {
var actions = [];
// let actionIdx = 0;
var parallel = 0;
function performAction() {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
parallel++;
_a.label = 1;
case 1:
if (!(actions.length > 0)) return [3 /*break*/, 3];
return [4 /*yield*/, actions.shift()];
case 2:
_a.sent();
return [3 /*break*/, 1];
case 3:
parallel--;
return [2 /*return*/];
}
});
});
}
return {
add: function (action) {
return new Promise(function (resolve, rej) {
actions.push(function () { return action().then(resolve).catch(rej); });
if (parallel < maxParallel) {
performAction();
}
});
}
};
}
exports.queue = queue;
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