////  LogHandler.cpp//  libraries/shared/src////  Created by Stephen Birarda on 2014-10-28.//  Migrated from Logging.cpp created on 6/11/13//  Copyright 2014 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_LogHandler_h#define hifi_LogHandler_h #include <QHash>#include <QObject>#include <QSet>#include <QString>#include <QMutex> const int VERBOSE_LOG_INTERVAL_SECONDS = 5; enum LogMsgType {    LogInfo = QtInfoMsg,    LogDebug = QtDebugMsg,    LogWarning = QtWarningMsg,    LogCritical = QtCriticalMsg,    LogFatal = QtFatalMsg,    LogSuppressed = 100}; /// Handles custom message handling and sending of stats/logs to Logstash instanceclass LogHandler : public QObject {    Q_OBJECTpublic:    static LogHandler& getInstance();     /// sets the target name to output via the verboseMessageHandler, called once before logging begins    /// \param targetName the desired target name to output in logs    void setTargetName(const QString& targetName) { _targetName = targetName; }     void setShouldOutputProcessID(bool shouldOutputProcessID) { _shouldOutputProcessID = shouldOutputProcessID; }    void setShouldOutputThreadID(bool shouldOutputThreadID) { _shouldOutputThreadID = shouldOutputThreadID; }    void setShouldDisplayMilliseconds(bool shouldDisplayMilliseconds) { _shouldDisplayMilliseconds = shouldDisplayMilliseconds; }     QString printMessage(LogMsgType type, const QMessageLogContext& context, const QString &message);     /// a qtMessageHandler that can be hooked up to a target that links to Qt    /// prints various process, message type, and time information    static void verboseMessageHandler(QtMsgType type, const QMessageLogContext& context, const QString &message);     const QString& addRepeatedMessageRegex(const QString& regexString);    const QString& addOnlyOnceMessageRegex(const QString& regexString);private:    LogHandler();     void flushRepeatedMessages();     QString _targetName;    bool _shouldOutputProcessID { false };    bool _shouldOutputThreadID { false };    bool _shouldDisplayMilliseconds { false };    QSet<QString> _repeatedMessageRegexes;    QHash<QString, int> _repeatMessageCountHash;    QHash<QString, QString> _lastRepeatedMessage;    QMutex _repeatedMessageLock;     QSet<QString> _onlyOnceMessageRegexes;    QHash<QString, int> _onlyOnceMessageCountHash;    QMutex _onlyOnceMessageLock;}; #endif // hifi_LogHandler_h