molstar
Version:
A comprehensive macromolecular library.
59 lines (58 loc) • 2.27 kB
JavaScript
/**
* Copyright (c) 2022 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Adam Midlik <midlik@gmail.com>
*/
import { __awaiter, __generator } from "tslib";
/** Job queue that allows at most one running and one pending job.
* A newly enqueued job will cancel any other pending jobs. */
var SingleAsyncQueue = /** @class */ (function () {
function SingleAsyncQueue(log) {
if (log === void 0) { log = false; }
this.isRunning = false;
this.queue = [];
this.counter = 0;
this.log = log;
}
SingleAsyncQueue.prototype.enqueue = function (job) {
if (this.log)
console.log('SingleAsyncQueue enqueue', this.counter);
this.queue[0] = { id: this.counter, func: job };
this.counter++;
this.run(); // do not await
};
SingleAsyncQueue.prototype.run = function () {
return __awaiter(this, void 0, void 0, function () {
var job;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (this.isRunning)
return [2 /*return*/];
job = this.queue.pop();
if (!job)
return [2 /*return*/];
this.isRunning = true;
_a.label = 1;
case 1:
_a.trys.push([1, , 3, 4]);
if (this.log)
console.log('SingleAsyncQueue run', job.id);
return [4 /*yield*/, job.func()];
case 2:
_a.sent();
if (this.log)
console.log('SingleAsyncQueue complete', job.id);
return [3 /*break*/, 4];
case 3:
this.isRunning = false;
this.run();
return [7 /*endfinally*/];
case 4: return [2 /*return*/];
}
});
});
};
return SingleAsyncQueue;
}());
export { SingleAsyncQueue };