////  ScriptCache.h//  libraries/script-engine/src////  Created by Brad Hefta-Gaub on 2015-03-30//  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_ScriptCache_h#define hifi_ScriptCache_h #include <mutex>#include <ResourceCache.h> using contentAvailableCallback = std::function<void(const QString& scriptOrURL, const QString& contents, bool isURL, bool contentAvailable)>; class ScriptUser {public:    virtual void scriptContentsAvailable(const QUrl& url, const QString& scriptContents) = 0;    virtual void errorInLoadingScript(const QUrl& url) = 0;}; class ScriptRequest {public:    std::vector<contentAvailableCallback> scriptUsers { };    int numRetries { 0 };}; /// Interface for loading scriptsclass ScriptCache : public QObject, public Dependency {    Q_OBJECT    SINGLETON_DEPENDENCY     using Mutex = std::mutex;    using Lock = std::unique_lock<Mutex>; public:    void clearCache();    Q_INVOKABLE void clearATPScriptsFromCache();    void getScriptContents(const QString& scriptOrURL, contentAvailableCallback contentAvailable, bool forceDownload = false);      QString getScript(const QUrl& unnormalizedURL, ScriptUser* scriptUser, bool& isPending, bool redownload = false);    void deleteScript(const QUrl& unnormalizedURL);     // FIXME - how do we remove a script from the bad script list in the case of a redownload?    void addScriptToBadScriptList(const QUrl& url) { _badScripts.insert(url); }    bool isInBadScriptList(const QUrl& url) { return _badScripts.contains(url); }    private slots:    void scriptDownloaded(); // old version    void scriptContentAvailable(); // new version private:    ScriptCache(QObject* parent = NULL);        Mutex _containerLock;    QMap<QUrl, ScriptRequest> _activeScriptRequests;        QHash<QUrl, QString> _scriptCache;    QMultiMap<QUrl, ScriptUser*> _scriptUsers;    QSet<QUrl> _badScripts;}; #endif // hifi_ScriptCache_h