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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_RAPPOR_RAPPOR_PARAMETERS_H_
#define COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_
#include <string>
namespace rappor {
enum Probability {
PROBABILITY_75, // 75%
PROBABILITY_50, // 50%
PROBABILITY_25, // 25%
};
// A metric is reported when it's reporting level is >= the reporting level
// passed in to RapporService::Start()
enum RecordingLevel {
// No metrics are reported at this level.
RECORDING_DISABLED = 0,
// Metrics suitable for broader populations.
COARSE_LEVEL,
// Metrics suitable for UMA opt-in users.
FINE_LEVEL,
};
// An object describing a rappor metric and the parameters used to generate it.
//
// For a full description of the rappor metrics, see
// http://www.chromium.org/developers/design-documents/rappor
struct RapporParameters {
// Get a string representing the parameters, for DCHECK_EQ.
std::string ToString() const;
// The maximum number of cohorts we divide clients into.
static const int kMaxCohorts;
// The number of cohorts to divide the reports for this metric into.
// This should divide kMaxCohorts evenly so that each cohort has an equal
// probability of being assigned users.
int num_cohorts;
// The number of bytes stored in the Bloom filter.
int bloom_filter_size_bytes;
// The number of hash functions used in the Bloom filter.
int bloom_filter_hash_function_count;
// The probability that a bit will be redacted with fake data.
Probability fake_prob;
// The probability that a fake bit will be a one.
Probability fake_one_prob;
// The probability that a one bit in the redacted data reports as one.
Probability one_coin_prob;
// The probability that a zero bit in the redacted data reports as one.
Probability zero_coin_prob;
// The reporting level this metric is reported at.
RecordingLevel recording_level;
};
} // namespace rappor
#endif // COMPONENTS_RAPPOR_RAPPOR_PARAMETERS_H_
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