base/files/file_tracing.cc

// 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.

#include "base/files/file_tracing.h"

#include "base/files/file.h"

namespace base {

namespace {
FileTracing::Provider* g_provider = nullptr;
}

// static
void FileTracing::SetProvider(FileTracing::Provider* provider) {
  g_provider = provider;
}

FileTracing::ScopedEnabler::ScopedEnabler() {
  if (g_provider)
    g_provider->FileTracingEnable(this);
}

FileTracing::ScopedEnabler::~ScopedEnabler() {
  if (g_provider)
    g_provider->FileTracingDisable(this);
}

FileTracing::ScopedTrace::ScopedTrace() : initialized_(false) {}

FileTracing::ScopedTrace::~ScopedTrace() {
  if (initialized_ && g_provider) {
    g_provider->FileTracingEventEnd(
        name_, &file_->trace_enabler_, file_->path_, size_);
  }
}

bool FileTracing::ScopedTrace::ShouldInitialize() const {
  return g_provider && g_provider->FileTracingCategoryIsEnabled();
}

void FileTracing::ScopedTrace::Initialize(
    const char* name, File* file, int64 size) {
  file_ = file;
  name_ = name;
  size_ = size;
  initialized_ = true;

  if (g_provider) {
    g_provider->FileTracingEventBegin(
        name_, &file_->trace_enabler_, file_->path_, size_);
  }
}

}  // namespace base