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// Copyright 2014 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_FEEDBACK_TRACING_MANAGER_H_
#define COMPONENTS_FEEDBACK_TRACING_MANAGER_H_
#include "base/callback.h"
#include "base/memory/scoped_refptr.h"
namespace base {
class RefCountedString;
} // namespace base
// Callback used for getting the output of a trace.
using TraceDataCallback =
base::OnceCallback<void(scoped_refptr<base::RefCountedString> trace_data)>;
// This class is used to manage performance metrics that can be attached to
// feedback reports. This class is a pure interface.
//
// When a performance trace is desired, TracingManager::RequestTrace() should
// be invoked. The TracingManager will then start preparing a zipped version
// of the performance data. That data can then be requested via GetTraceData().
// When the data is no longer needed, it should be discarded via
// DiscardTraceData().
class TracingManager {
public:
virtual ~TracingManager();
TracingManager(const TracingManager&) = delete;
TracingManager& operator=(const TracingManager&) = delete;
// Request a trace ending at the current time. If a trace is already being
// collected, the id for that trace is returned.
virtual int RequestTrace() = 0;
// Get the trace data for |id|. On success, true is returned, and the data is
// returned via |callback|. Returns false on failure.
virtual bool GetTraceData(int id, TraceDataCallback callback) = 0;
// Discard the data for trace |id|.
virtual void DiscardTraceData(int id) = 0;
protected:
TracingManager();
};
#endif // COMPONENTS_FEEDBACK_TRACING_MANAGER_H_
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