Index: base/test/histogram_recorder.h |
diff --git a/base/test/histogram_recorder.h b/base/test/histogram_recorder.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..9edd982134f0783dd0f414dd954eb1b458733531 |
--- /dev/null |
+++ b/base/test/histogram_recorder.h |
@@ -0,0 +1,37 @@ |
+// Copyright 2013 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 BASE_TEST_HISTOGRAM_RECORDER_H_ |
+#define BASE_TEST_HISTOGRAM_RECORDER_H_ |
+ |
+#include <map> |
+ |
+#include "base/metrics/histogram_samples.h" |
+ |
+namespace base { |
+ |
+// This class acts as a differential reader for histogram samples, enabling |
+// tests to check that metrics were sent as they should be. |
+class HistogramRecorder { |
+ public: |
+ // Constructor takes a histogram prefix. |
blundell
2013/07/10 14:35:36
Instead of this comment, have a comment explaining
lpromero
2013/07/10 17:08:33
Done.
|
+ explicit HistogramRecorder(const std::string& prefix); |
+ virtual ~HistogramRecorder(); |
+ |
+ // Returns the histogram data accumulated since this instance was created. |
+ // The returned pointer is owned by the HistogramRecorder instance and cannot |
+ // be used after that instance is destroyed. |
+ // Returns NULL if no samples are available. |
+ HistogramSamples* GetHistogramSamples(const std::string& histogram_name); |
blundell
2013/07/10 14:35:36
I think this would be more clear as GetHistogramSa
lpromero
2013/07/10 17:08:33
Done.
|
+ |
+ private: |
+ // Used to determine the histogram changes made during this instance's |
+ // lifecycle. |
+ std::map<std::string, HistogramSamples*> original_samples_; |
+ std::map<std::string, HistogramSamples*> samples_; |
+}; |
+ |
+} // namespace base |
+ |
+#endif // BASE_TEST_HISTOGRAM_RECORDER_H_ |