memfs
Version:
In-memory file-system with Node's fs API.
42 lines • 1.13 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.concurrency = void 0;
const go_1 = require("./go");
class Task {
constructor(code) {
this.code = code;
this.promise = new Promise((resolve, reject) => {
this.resolve = resolve;
this.reject = reject;
});
}
}
/** Limits concurrency of async code. */
const concurrency = (limit) => {
let workers = 0;
const queue = new Set();
const work = async () => {
const task = queue.values().next().value;
if (task)
queue.delete(task);
else
return;
workers++;
try {
task.resolve(await task.code());
}
catch (error) {
task.reject(error);
}
finally {
workers--, queue.size && (0, go_1.go)(work);
}
};
return async (code) => {
const task = new Task(code);
queue.add(task);
return workers < limit && (0, go_1.go)(work), task.promise;
};
};
exports.concurrency = concurrency;
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