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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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