Index: chrome/installer/util/experiment.cc |
diff --git a/chrome/installer/util/experiment.cc b/chrome/installer/util/experiment.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..bcf87d9022b8a548ff9885642b005634523219b6 |
--- /dev/null |
+++ b/chrome/installer/util/experiment.cc |
@@ -0,0 +1,141 @@ |
+// Copyright 2017 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. |
+ |
+#include "chrome/installer/util/experiment.h" |
+ |
+#include <algorithm> |
+#include <cmath> |
+ |
+#include "base/logging.h" |
+ |
+namespace installer { |
+ |
+namespace { |
+ |
+// Returns closest integer of logarithm of |x| with base |b|. |
+double LogFloor(double x, double b) { |
+ return std::round(std::log(x) / std::log(b)); |
+} |
+ |
+// Returns the base to use for exponential buckets so that buckets |
+// 0,1,.. 2^|bits|-1 cover range [0, max_val]. If this function return b |
+// then Bucket value i will store values from [b^i, b^(i+1)] |
+double ExpBucketBase(int max_val, int bits) { |
+ return std::exp(std::log(max_val + 1) / ((1 << bits) - 1)); |
+} |
+ |
+} // namespace |
+ |
+Experiment::Experiment() = default; |
+Experiment::Experiment(Experiment&&) = default; |
+Experiment::Experiment(const Experiment&) = default; |
+Experiment::~Experiment() = default; |
+ |
+void Experiment::InitializeFromMetrics(const ExperimentMetrics& metrics) { |
+ *this = Experiment(); |
+ DCHECK(metrics.InInitialState() || |
+ metrics.state == ExperimentMetrics::kGroupAssigned); |
+ if (metrics.state == ExperimentMetrics::kUninitialized) { |
+ // Ignore uninitialized metrics. |
grt (UTC plus 2)
2017/06/09 14:04:22
it shouldn't ignore, but rather make the state of
nikunjb
2017/06/13 00:27:35
Done.
One point to note regarding kUninitialized
grt (UTC plus 2)
2017/06/13 12:24:48
Right. We should never store uninitialized metrics
|
+ return; |
+ } |
+ metrics_ = metrics; |
+ state_ = metrics.state; |
+ group_ = metrics.group; |
+} |
+ |
+void Experiment::SetState(ExperimentMetrics::State state) { |
+ DCHECK_NE(ExperimentMetrics::kUninitialized, state); |
+ state_ = state; |
+ metrics_.state = state; |
+} |
+ |
+void Experiment::AssignGroup(int group) { |
+ DCHECK_GE(group, 0); |
+ DCHECK_LT(group, ExperimentMetrics::kNumGroups); |
+ DCHECK(metrics_.InInitialState()); |
+ |
+ group_ = group; |
+ metrics_.group = group; |
+ SetState(ExperimentMetrics::kGroupAssigned); |
+} |
+ |
+void Experiment::SetToastLocation(ExperimentMetrics::ToastLocation location) { |
+ DCHECK(!metrics_.InTerminalState()); |
+ DCHECK(!metrics_.InInitialState()); |
+ toast_location_ = location; |
+ metrics_.toast_location = location; |
+} |
+ |
+void Experiment::SetInactiveDays(int days) { |
+ DCHECK(!metrics_.InTerminalState()); |
+ DCHECK(!metrics_.InInitialState()); |
+ DCHECK_GE(days, 0); |
+ inactive_days_ = days; |
+ double log_base = ExpBucketBase(ExperimentMetrics::kMaxLastUsed, |
+ ExperimentMetrics::kLastUsedBucketBits); |
+ metrics_.last_used_bucket = |
+ LogFloor(1 + std::min(days, ExperimentMetrics::kMaxLastUsed), log_base); |
+} |
+ |
+void Experiment::SetToastCount(int count) { |
+ DCHECK(!metrics_.InTerminalState()); |
+ DCHECK(!metrics_.InInitialState()); |
+ toast_count_ = count; |
+ metrics_.toast_count = std::min(count, ExperimentMetrics::kMaxToastCount); |
+} |
+ |
+void Experiment::SetDisplayTime(base::Time time) { |
+ DCHECK(!metrics_.InTerminalState()); |
+ DCHECK(!metrics_.InInitialState()); |
+ if (metrics_.first_toast_offset == 0) { |
+ // This is the first time toast is shown so add user to today's cohort. |
+ first_display_time_ = time; |
+ metrics_.first_toast_offset = |
+ (time - base::Time::UnixEpoch() - |
+ base::TimeDelta::FromSeconds( |
+ ExperimentMetrics::kExperimentStartSeconds)) |
+ .InDays(); |
+ // If display time is outside the experiment range (possible due to |
+ // invalid local time), then set it to be kMaxFirstToastOffset. |
+ if (metrics_.first_toast_offset < 0) { |
+ metrics_.first_toast_offset = ExperimentMetrics::kMaxFirstToastOffset; |
+ } else { |
+ metrics_.first_toast_offset = std::min( |
+ metrics_.first_toast_offset, ExperimentMetrics::kMaxFirstToastOffset); |
+ } |
+ } |
+ latest_display_time_ = time; |
+ metrics_.toast_hour = (time - time.LocalMidnight()).InHours(); |
+ DCHECK_LE(metrics_.toast_hour, 24); |
+ DCHECK_GE(metrics_.toast_hour, 0); |
+} |
+ |
+void Experiment::SetUserSessionUptime(base::TimeDelta time_delta) { |
+ DCHECK(!metrics_.InTerminalState()); |
+ DCHECK(!metrics_.InInitialState()); |
+ user_session_uptime_ = time_delta; |
+ double log_base = ExpBucketBase(ExperimentMetrics::kMaxSessionLength, |
+ ExperimentMetrics::kSessionLengthBucketBits); |
+ metrics_.session_length_bucket = LogFloor( |
+ 1 + std::min(time_delta, base::TimeDelta::FromMinutes( |
+ ExperimentMetrics::kMaxSessionLength)) |
+ .InMinutes(), |
+ log_base); |
+} |
+ |
+void Experiment::SetActionDelay(base::TimeDelta time_delta) { |
+ DCHECK(!metrics_.InTerminalState()); |
+ DCHECK(!metrics_.InInitialState()); |
+ action_delay_ = time_delta; |
+ double log_base = ExpBucketBase(ExperimentMetrics::kMaxActionDelay, |
+ ExperimentMetrics::kActionDelayBucketBits); |
+ metrics_.action_delay_bucket = |
+ LogFloor(1 + std::min(time_delta, base::TimeDelta::FromSeconds( |
+ ExperimentMetrics::kMaxActionDelay)) |
+ .InSeconds(), |
+ log_base); |
+} |
+ |
+} // namespace installer |