// Copyright 2018 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 COMPONENTS_TRACING_COMMON_STACK_SAMPLER_ANDROID_H_
#define COMPONENTS_TRACING_COMMON_STACK_SAMPLER_ANDROID_H_

#include "base/profiler/stack_sampler.h"
#include "base/threading/platform_thread.h"
#include "components/tracing/common/stack_unwinder_android.h"

namespace tracing {

// On Android the sampling implementation is delegated and this class just
// stores a callback to the real implementation.
class StackSamplerAndroid : public base::StackSampler {
 public:
  // StackUnwinderAndroid only supports sampling one thread at a time. So, the
  // clients of this class must ensure synchronization between multiple
  // instances of the sampler.
  explicit StackSamplerAndroid(base::PlatformThreadId thread_id);
  ~StackSamplerAndroid() override;

  StackSamplerAndroid(const StackSamplerAndroid&) = delete;
  StackSamplerAndroid& operator=(const StackSamplerAndroid&) = delete;

  // StackSamplingProfiler::StackSampler:
  void RecordStackFrames(StackBuffer* stack_buffer,
                         base::ProfileBuilder* profile_builder) override;

 private:
  base::PlatformThreadId tid_;
  StackUnwinderAndroid unwinder_;
};

}  // namespace tracing

#endif  // COMPONENTS_TRACING_COMMON_STACK_SAMPLER_ANDROID_H_