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class Queue {
static queue = [];
static pendingPromise = false;
static stop = false;
static enqueue(promise) {
return new Promise((resolve, reject) => {
this.queue.push({
promise,
resolve,
reject
});
this.dequeue();
});
}
static dequeue() {
if (this.workingOnPromise) {
return false;
}
if (this.stop) {
this.queue = [];
this.stop = false;
return;
}
const item = this.queue.shift();
if (!item) {
return false;
}
try {
this.workingOnPromise = true;
item
.promise()
.then((value) => {
this.workingOnPromise = false;
item.resolve(value);
this.dequeue();
})
.catch((err) => {
this.workingOnPromise = false;
item.reject(err);
this.dequeue();
});
} catch (err) {
this.workingOnPromise = false;
item.reject(err);
this.dequeue();
}
return true;
}
}
export default Queue
|
