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Unified Diff: components/metrics/linearhistogram_sample_chromeos.h

Issue 227873002: Create a histogram serialization mechanism in components/metrics (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Moving to components instead of base. Adding sanity checks. Fixing lint Created 6 years, 8 months ago
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Index: components/metrics/linearhistogram_sample_chromeos.h
diff --git a/components/metrics/linearhistogram_sample_chromeos.h b/components/metrics/linearhistogram_sample_chromeos.h
new file mode 100644
index 0000000000000000000000000000000000000000..a0c40613556057ec9df472840a4ee3fccb75e3ac
--- /dev/null
+++ b/components/metrics/linearhistogram_sample_chromeos.h
@@ -0,0 +1,45 @@
+// 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_METRICS_LINEARHISTOGRAM_SAMPLE_CHROMEOS_H
Ben Chan 2014/04/18 20:27:08 ditto
+#define COMPONENTS_METRICS_LINEARHISTOGRAM_SAMPLE_CHROMEOS_H
+
+#include <string>
+
+#include "base/base_export.h"
+#include "base/compiler_specific.h"
+#include "components/metrics/metric_sample_chromeos.h"
+
+namespace metrics {
+
+// Represents a linear histogram sample (called Enum too).
+// This class is meant to be used to serialize and deserialize samples to send
+// them from chrome os to chrome.
+class BASE_EXPORT LinearHistogramSample : public MetricSample {
+ public:
+ LinearHistogramSample(const std::string& name, int sample, int max);
+ virtual ~LinearHistogramSample();
+
+ int sample() const { return sample_; }
+ int max() const { return max_; }
+
+ // Returns the serialized version of the sample in the format:
+ // linearhistogram\0|name_| |sample_| |max_|\0
+ virtual std::string ToString() const OVERRIDE;
+
+ // Deserialize a sample passed as a string.
+ // Returns a LinearHistogram if the deserialization is successful.
+ // Returns NULL if the deserialization fails.
+ static LinearHistogramSample* ReadLinearHistogram(
+ const std::string& serialized_histogram);
+
+ private:
+ const int sample_, max_;
+
+ DISALLOW_COPY_AND_ASSIGN(LinearHistogramSample);
+};
+
+} // namespace metrics
+
+#endif // COMPONENTS_METRICS_LINEARHISTOGRAM_SAMPLE_CHROMEOS_H

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