b19f0d106f
Changes to a much more efficient and more reusable protobuf format for metrics. Test: Widevine tests, Google Play and MediaDrm CTS test. Bug: 73724218 Change-Id: I3299051d7a16bcd7758c8f272415ca40e10c1313
51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
// Copyright 2018 Google Inc. All Rights Reserved.
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//
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// This file contains the declaration of the Pow2Bucket class which
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// is a convenient way to bucketize sampled values into powers of 2.
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#ifndef WVCDM_METRICS_POW2BUCKET_H_
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#define WVCDM_METRICS_POW2BUCKET_H_
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namespace wvcdm {
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namespace metrics {
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// This class converts the size_t value into the highest power of two
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// below the value. E.g. for 7, the value is 4. For 11, the value is 8.
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// This class is intended to simplify the use of EventMetric Fields that may
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// have many possible values, but we want to bucket them into a small set of
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// numbers (32 or 64).
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class Pow2Bucket {
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public:
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explicit Pow2Bucket(size_t value) : value_(GetLowerBucket(value)) {}
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Pow2Bucket(const Pow2Bucket &value) : value_(value.value_) {}
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size_t value() const { return value_; }
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// Support for converting to string.
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friend std::ostream &operator<<(std::ostream &os, const Pow2Bucket &log) {
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return os << log.value_;
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}
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private:
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inline size_t GetLowerBucket(size_t value) {
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if (!value) {
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return 0;
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}
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size_t log = 0;
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while (value) {
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log++;
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value >>= 1;
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}
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return 1u << (log - 1);
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}
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size_t value_;
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};
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} // namespace metrics
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} // namespace wvcdm
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#endif // WVCDM_METRICS_POW2BUCKET_H_
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