1*635a8641SAndroid Build Coastguard Worker // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2*635a8641SAndroid Build Coastguard Worker // Use of this source code is governed by a BSD-style license that can be 3*635a8641SAndroid Build Coastguard Worker // found in the LICENSE file. 4*635a8641SAndroid Build Coastguard Worker 5*635a8641SAndroid Build Coastguard Worker #ifndef BASE_METRICS_HISTOGRAM_FLATTENER_H_ 6*635a8641SAndroid Build Coastguard Worker #define BASE_METRICS_HISTOGRAM_FLATTENER_H_ 7*635a8641SAndroid Build Coastguard Worker 8*635a8641SAndroid Build Coastguard Worker #include <map> 9*635a8641SAndroid Build Coastguard Worker #include <string> 10*635a8641SAndroid Build Coastguard Worker 11*635a8641SAndroid Build Coastguard Worker #include "base/macros.h" 12*635a8641SAndroid Build Coastguard Worker #include "base/metrics/histogram.h" 13*635a8641SAndroid Build Coastguard Worker 14*635a8641SAndroid Build Coastguard Worker namespace base { 15*635a8641SAndroid Build Coastguard Worker 16*635a8641SAndroid Build Coastguard Worker class HistogramSamples; 17*635a8641SAndroid Build Coastguard Worker 18*635a8641SAndroid Build Coastguard Worker // HistogramFlattener is an interface used by HistogramSnapshotManager, which 19*635a8641SAndroid Build Coastguard Worker // handles the logistics of gathering up available histograms for recording. 20*635a8641SAndroid Build Coastguard Worker class BASE_EXPORT HistogramFlattener { 21*635a8641SAndroid Build Coastguard Worker public: 22*635a8641SAndroid Build Coastguard Worker virtual void RecordDelta(const HistogramBase& histogram, 23*635a8641SAndroid Build Coastguard Worker const HistogramSamples& snapshot) = 0; 24*635a8641SAndroid Build Coastguard Worker 25*635a8641SAndroid Build Coastguard Worker protected: 26*635a8641SAndroid Build Coastguard Worker HistogramFlattener() = default; 27*635a8641SAndroid Build Coastguard Worker virtual ~HistogramFlattener() = default; 28*635a8641SAndroid Build Coastguard Worker 29*635a8641SAndroid Build Coastguard Worker private: 30*635a8641SAndroid Build Coastguard Worker DISALLOW_COPY_AND_ASSIGN(HistogramFlattener); 31*635a8641SAndroid Build Coastguard Worker }; 32*635a8641SAndroid Build Coastguard Worker 33*635a8641SAndroid Build Coastguard Worker } // namespace base 34*635a8641SAndroid Build Coastguard Worker 35*635a8641SAndroid Build Coastguard Worker #endif // BASE_METRICS_HISTOGRAM_FLATTENER_H_ 36