Method _processQueue

Picviewer CE+/dist.user.js:12135–12156

()

        }

        _processQueue() {
            if (this.activeCount >= this.concurrency || this.queue.length === 0) {
                return;
            }

            this.activeCount++;
            const { url, resolve, reject } = this.queue.shift();

            this._fetchByHead(url)
                .then(size => {
                    if (size !== null) this.cache.set(url, size);
                    resolve(size);
                })
                .catch(err => {
                    console.warn(`Fetch size failed for ${url}`, err);
                    resolve(null);
                })
                .finally(() => {
                    this.activeCount--;
                    this._processQueue();
                });
        }

        _fetchByHead(url) {
            return new Promise((resolve, reject) => {