96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
|
// Copyright 2015 The Chromium Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style license that can be
|
||
|
|
// found in the LICENSE file.
|
||
|
|
|
||
|
|
#ifndef BASE_FILES_FILE_TRACING_H_
|
||
|
|
#define BASE_FILES_FILE_TRACING_H_
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include "base/base_export.h"
|
||
|
|
#include "base/macros.h"
|
||
|
|
|
||
|
|
#define FILE_TRACING_PREFIX "File"
|
||
|
|
|
||
|
|
#define SCOPED_FILE_TRACE_WITH_SIZE(name, size) \
|
||
|
|
FileTracing::ScopedTrace scoped_file_trace; \
|
||
|
|
if (FileTracing::IsCategoryEnabled()) \
|
||
|
|
scoped_file_trace.Initialize(FILE_TRACING_PREFIX "::" name, this, size)
|
||
|
|
|
||
|
|
#define SCOPED_FILE_TRACE(name) SCOPED_FILE_TRACE_WITH_SIZE(name, 0)
|
||
|
|
|
||
|
|
namespace base {
|
||
|
|
|
||
|
|
class File;
|
||
|
|
class FilePath;
|
||
|
|
|
||
|
|
class BASE_EXPORT FileTracing {
|
||
|
|
public:
|
||
|
|
// Whether the file tracing category is enabled.
|
||
|
|
static bool IsCategoryEnabled();
|
||
|
|
|
||
|
|
class Provider {
|
||
|
|
public:
|
||
|
|
virtual ~Provider() = default;
|
||
|
|
|
||
|
|
// Whether the file tracing category is currently enabled.
|
||
|
|
virtual bool FileTracingCategoryIsEnabled() const = 0;
|
||
|
|
|
||
|
|
// Enables file tracing for |id|. Must be called before recording events.
|
||
|
|
virtual void FileTracingEnable(const void* id) = 0;
|
||
|
|
|
||
|
|
// Disables file tracing for |id|.
|
||
|
|
virtual void FileTracingDisable(const void* id) = 0;
|
||
|
|
|
||
|
|
// Begins an event for |id| with |name|. |path| tells where in the directory
|
||
|
|
// structure the event is happening (and may be blank). |size| is the number
|
||
|
|
// of bytes involved in the event.
|
||
|
|
virtual void FileTracingEventBegin(const char* name,
|
||
|
|
const void* id,
|
||
|
|
const FilePath& path,
|
||
|
|
int64_t size) = 0;
|
||
|
|
|
||
|
|
// Ends an event for |id| with |name|.
|
||
|
|
virtual void FileTracingEventEnd(const char* name, const void* id) = 0;
|
||
|
|
};
|
||
|
|
|
||
|
|
// Sets a global file tracing provider to query categories and record events.
|
||
|
|
static void SetProvider(Provider* provider);
|
||
|
|
|
||
|
|
// Enables file tracing while in scope.
|
||
|
|
class ScopedEnabler {
|
||
|
|
public:
|
||
|
|
ScopedEnabler();
|
||
|
|
~ScopedEnabler();
|
||
|
|
};
|
||
|
|
|
||
|
|
class ScopedTrace {
|
||
|
|
public:
|
||
|
|
ScopedTrace();
|
||
|
|
~ScopedTrace();
|
||
|
|
|
||
|
|
// Called only if the tracing category is enabled. |name| is the name of the
|
||
|
|
// event to trace (e.g. "Read", "Write") and must have an application
|
||
|
|
// lifetime (e.g. static or literal). |file| is the file being traced; must
|
||
|
|
// outlive this class. |size| is the size (in bytes) of this event.
|
||
|
|
void Initialize(const char* name, const File* file, int64_t size);
|
||
|
|
|
||
|
|
private:
|
||
|
|
// The ID of this trace. Based on the |file| passed to |Initialize()|. Must
|
||
|
|
// outlive this class.
|
||
|
|
const void* id_;
|
||
|
|
|
||
|
|
// The name of the event to trace (e.g. "Read", "Write"). Prefixed with
|
||
|
|
// "File".
|
||
|
|
const char* name_;
|
||
|
|
|
||
|
|
DISALLOW_COPY_AND_ASSIGN(ScopedTrace);
|
||
|
|
};
|
||
|
|
|
||
|
|
DISALLOW_COPY_AND_ASSIGN(FileTracing);
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace base
|
||
|
|
|
||
|
|
#endif // BASE_FILES_FILE_TRACING_H_
|