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//===-- LogMessageOsLog.h ---------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//


#ifndef LogMessageOsLog_h
#define LogMessageOsLog_h

#include "DarwinLogInterfaces.h"

#include "ActivityStreamSPI.h"
#include "LogMessage.h"

using ActivityStreamEntry = struct os_activity_stream_entry_s;

// -----------------------------------------------------------------------------
/// Provides a unified wrapper around os_log()-style log messages.
///
/// The lifetime of this class is intended to be very short.  The caller
/// must ensure that the passed in ActivityStore and ActivityStreamEntry
/// outlive this LogMessageOsLog entry.
// -----------------------------------------------------------------------------

class LogMessageOsLog : public LogMessage
{
public:

    static void
    SetFormatterFunction(os_log_copy_formatted_message_t format_func);

    LogMessageOsLog(const ActivityStore &activity_store,
                    ActivityStreamEntry &entry);

    // API methods

    bool
    HasActivity() const override;

    const char*
    GetActivity() const override;

    std::string
    GetActivityChain() const override;

    bool
    HasCategory() const override;

    const char*
    GetCategory() const override;

    bool
    HasSubsystem() const override;

    const char*
    GetSubsystem() const override;

    const char*
    GetMessage() const override;

private:

    const ActivityStore &m_activity_store;
    ActivityStreamEntry &m_entry;
    mutable std::string m_message;

};

#endif /* LogMessageOsLog_h */
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