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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
// System independant wrapper for logging runtime information to file.
// Note: All log messages will be written to the same trace file.
// Note: If to many messages are written to file there will be a build up of
// messages. Apply filtering to avoid that.
#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_H_
#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_H_
#include "common_types.h"
#include "typedefs.h"
#define WEBRTC_TRACE Trace::Add
namespace webrtc {
class Trace
{
public:
// Increments the reference count to the trace.
static void CreateTrace();
// Decrements the reference count to the trace.
static void ReturnTrace();
// Note: any instance that writes to the trace file should increment and
// decrement the reference count on construction and destruction
// respectively
// Specifies what type of messages should be written to the trace file. The
// filter parameter is a bitmask where each message type is enumerated by
// the TraceLevel enumerator. TODO (hellner) why is the
// TraceLevel enumerator not defined in this file?
static WebRtc_Word32 SetLevelFilter(const WebRtc_UWord32 filter);
// Returns what type of messages are written to the trace file.
static WebRtc_Word32 LevelFilter(WebRtc_UWord32& filter);
// Sets the file name. If addFileCounter is false the same file will be
// reused when it fills up. If it's true a new file with incremented name
// will be used.
static WebRtc_Word32 SetTraceFile(const char* fileName,
const bool addFileCounter = false);
// Returns the name of the file that the trace is currently writing to.
static WebRtc_Word32 TraceFile(char fileName[1024]);
// Registers callback to receive trace messages. TODO (hellner)
// why not use OutStream instead? Why is TraceCallback not defined in this
// file
static WebRtc_Word32 SetTraceCallback(TraceCallback* callback);
// Adds a trace message for writing to file. The message is put in a queue
// for writing to file whenever possible for performance reasons. I.e. there
// is a crash it is possible that the last, vital logs are not logged yet.
// level is the the type of message to log. If that type of messages is
// filtered it will not be written to file. module is an identifier for what
// part of the code the message is comming.
// id is an identifier that should be unique for that set of classes that
// are associated (e.g. all instances owned by an engine).
// msg and the elipsis are the same as e.g. sprintf.
// TODO (hellner) Why is TraceModule not defined in this file?
static void Add(const TraceLevel level,
const TraceModule module,
const WebRtc_Word32 id,
const char* msg, ...);
};
} // namespace webrtc
#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_TRACE_H_
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