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// 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 "base/base_export.h"
#include "base/basictypes.h"
#include "base/macros.h"
#define FILE_TRACING_PREFIX "File"
#define SCOPED_FILE_TRACE_WITH_SIZE(name, size) \
FileTracing::ScopedTrace scoped_file_trace; \
if (scoped_file_trace.ShouldInitialize()) \
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:
class Provider {
public:
// 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(void* id) = 0;
// Disables file tracing for |id|.
virtual void FileTracingDisable(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 reported
// if not 0.
virtual void FileTracingEventBegin(
const char* name, void* id, const FilePath& path, int64 size) = 0;
// Ends an event for |id| with |name|. |path| tells where in the directory
// structure the event is happening (and may be blank). |size| is reported
// if not 0.
virtual void FileTracingEventEnd(
const char* name, void* id, const FilePath& path, int64 size) = 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();
// Whether this trace should be initialized or not.
bool ShouldInitialize() const;
// Called only if the tracing category is enabled.
void Initialize(const char* event, File* file, int64 size);
private:
// True if |Initialize()| has been called. Don't touch |path_|, |event_|,
// or |bytes_| if |initialized_| is false.
bool initialized_;
// The event name to trace (e.g. "Read", "Write"). Prefixed with "File".
const char* name_;
// The file being traced. Must outlive this class.
File* file_;
// The size (in bytes) of this trace. Not reported if 0.
int64 size_;
DISALLOW_COPY_AND_ASSIGN(ScopedTrace);
};
DISALLOW_COPY_AND_ASSIGN(FileTracing);
};
} // namespace base
#endif // BASE_FILES_FILE_TRACING_H_
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