////  BatchLoader.cpp//  libraries/script-engine/src////  Created by Ryan Huffman on 01/22/15//  Copyright 2015 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include "BatchLoader.h" #include <QNetworkAccessManager>#include <QNetworkReply>#include <QFile>#include <QPointer> #include <NetworkAccessManager.h>#include <SharedUtil.h> #include "ScriptEngineLogging.h"#include "ResourceManager.h"#include "ScriptEngines.h"#include "ScriptCache.h" BatchLoader::BatchLoader(const QList<QUrl>& urls)    : QObject(),      _started(false),      _finished(false),      _urls(QSet<QUrl>(urls.begin(), urls.end())),      _data(),      _status() {    qRegisterMetaType<QMap<QUrl, QString>>("QMap<QUrl, QString>");} void BatchLoader::start(int maxRetries) {    if (_started) {        return;    }     _started = true;     if (_urls.size() == 0) {        _finished = true;        emit finished(_data, _status);        return;    }      for (const auto& rawURL : _urls) {        QUrl url = expandScriptUrl(normalizeScriptURL(rawURL));         auto scriptCache = DependencyManager::get<ScriptCache>();         // Use a proxy callback to handle the call and emit the signal in a thread-safe way.        // If BatchLoader is deleted before the callback is called, the subsequent "emit" call will not do        // anything.        ScriptCacheSignalProxy* proxy = new ScriptCacheSignalProxy();        connect(scriptCache.data(), &ScriptCache::destroyed, proxy, &ScriptCacheSignalProxy::deleteLater);         connect(proxy, &ScriptCacheSignalProxy::contentAvailable, this, [this](const QString& url, const QString& contents, bool isURL, bool success, const QString& status) {            _status.insert(url, status);            if (isURL && success) {                _data.insert(url, contents);            } else {                _data.insert(url, QString());            }             if (!_finished && _urls.size() == _data.size()) {                _finished = true;                emit finished(_data, _status);            }        });         scriptCache->getScriptContents(url.toString(), [proxy](const QString& url, const QString& contents, bool isURL, bool success, const QString& status) {            proxy->receivedContent(url, contents, isURL, success, status);            proxy->deleteLater();        }, false, maxRetries);    }} void ScriptCacheSignalProxy::receivedContent(const QString& url, const QString& contents, bool isURL, bool success, const QString& status) {    emit contentAvailable(url, contents, isURL, success, status);}