////  ResourceManager.h//  libraries/networking/src////  Created by Ryan Huffman on 2015/07/23//  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// #ifndef hifi_ResourceManager_h#define hifi_ResourceManager_h #include <functional> #include <QObject>#include <QtCore/QMutex>#include <QThread> #include <DependencyManager.h> #include "ResourceRequest.h" class ResourceManager: public QObject, public Dependency {    Q_OBJECT    SINGLETON_DEPENDENCY public:    ResourceManager(bool atpSupportEnabled = true);    ~ResourceManager();     void setUrlPrefixOverride(const QString& prefix, const QString& replacement);    QString normalizeURL(const QString& urlString);    QUrl normalizeURL(const QUrl& url);     ResourceRequest* createResourceRequest(        QObject* parent,        const QUrl& url,        const bool isObservable = true,        const qint64 callerId = -1,        const QString& extra = "");     void init();    void cleanup();     // Blocking call to check if a resource exists. This function uses a QEventLoop internally    // to return to the calling thread so that events can still be processed.    bool resourceExists(const QUrl& url);     // adjust where we persist the cache    void setCacheDir(const QString& cacheDir); private:    QThread _thread;     using PrefixMap = std::map<QString, QString>;     bool _atpSupportEnabled;    PrefixMap _prefixMap;    QMutex _prefixMapLock; }; #endif