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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "base/metrics/histogram_delta_serialization.h" |
| 6 |
| 7 #include "base/logging.h" |
| 8 #include "base/metrics/histogram_base.h" |
| 9 #include "base/metrics/histogram_snapshot_manager.h" |
| 10 #include "base/pickle.h" |
| 11 #include "base/safe_numerics.h" |
| 12 #include "base/values.h" |
| 13 |
| 14 namespace base { |
| 15 |
| 16 namespace { |
| 17 |
| 18 // Create or find existing histogram and add the samples from pickle. |
| 19 // Silently returns when seeing any data problem in the pickle. |
| 20 void DeserializeHistogramAndAddSamples(PickleIterator* iter) { |
| 21 HistogramBase* histogram = DeserializeHistogramInfo(iter); |
| 22 if (!histogram) |
| 23 return; |
| 24 |
| 25 if (histogram->flags() & HistogramBase::kIPCSerializationSourceFlag) { |
| 26 DVLOG(1) << "Single process mode, histogram observed and not copied: " |
| 27 << histogram->histogram_name(); |
| 28 return; |
| 29 } |
| 30 histogram->AddSamplesFromPickle(iter); |
| 31 } |
| 32 |
| 33 } // namespace |
| 34 |
| 35 HistogramDeltaSerialization::HistogramDeltaSerialization( |
| 36 const std::string& caller_name) |
| 37 : histogram_snapshot_manager_(this), |
| 38 serialized_deltas_(NULL) { |
| 39 inconsistencies_histogram_ = |
| 40 LinearHistogram::FactoryGet( |
| 41 "Histogram.Inconsistencies" + caller_name, 1, |
| 42 HistogramBase::NEVER_EXCEEDED_VALUE, |
| 43 HistogramBase::NEVER_EXCEEDED_VALUE + 1, |
| 44 HistogramBase::kUmaTargetedHistogramFlag); |
| 45 |
| 46 inconsistencies_unique_histogram_ = |
| 47 LinearHistogram::FactoryGet( |
| 48 "Histogram.Inconsistencies" + caller_name + "Unique", 1, |
| 49 HistogramBase::NEVER_EXCEEDED_VALUE, |
| 50 HistogramBase::NEVER_EXCEEDED_VALUE + 1, |
| 51 HistogramBase::kUmaTargetedHistogramFlag); |
| 52 |
| 53 inconsistent_snapshot_histogram_ = |
| 54 Histogram::FactoryGet( |
| 55 "Histogram.InconsistentSnapshot" + caller_name, 1, 1000000, 50, |
| 56 HistogramBase::kUmaTargetedHistogramFlag); |
| 57 } |
| 58 |
| 59 HistogramDeltaSerialization::~HistogramDeltaSerialization() { |
| 60 } |
| 61 |
| 62 void HistogramDeltaSerialization::PrepareAndSerializeDeltas( |
| 63 std::vector<std::string>* serialized_deltas) { |
| 64 serialized_deltas_ = serialized_deltas; |
| 65 // Note: Before serializing, we set the kIPCSerializationSourceFlag for all |
| 66 // the histograms, so that the receiving process can distinguish them from the |
| 67 // local histograms. |
| 68 histogram_snapshot_manager_.PrepareDeltas( |
| 69 Histogram::kIPCSerializationSourceFlag, false); |
| 70 serialized_deltas_ = NULL; |
| 71 } |
| 72 |
| 73 // static |
| 74 void HistogramDeltaSerialization::DeserializeAndAddSamples( |
| 75 const std::vector<std::string>& serialized_deltas) { |
| 76 for (std::vector<std::string>::const_iterator it = serialized_deltas.begin(); |
| 77 it != serialized_deltas.end(); ++it) { |
| 78 Pickle pickle(it->data(), checked_numeric_cast<int>(it->size())); |
| 79 PickleIterator iter(pickle); |
| 80 DeserializeHistogramAndAddSamples(&iter); |
| 81 } |
| 82 } |
| 83 |
| 84 void HistogramDeltaSerialization::RecordDelta( |
| 85 const HistogramBase& histogram, |
| 86 const HistogramSamples& snapshot) { |
| 87 DCHECK_NE(0, snapshot.TotalCount()); |
| 88 |
| 89 Pickle pickle; |
| 90 histogram.SerializeInfo(&pickle); |
| 91 snapshot.Serialize(&pickle); |
| 92 serialized_deltas_->push_back( |
| 93 std::string(static_cast<const char*>(pickle.data()), pickle.size())); |
| 94 } |
| 95 |
| 96 void HistogramDeltaSerialization::InconsistencyDetected( |
| 97 HistogramBase::Inconsistency problem) { |
| 98 inconsistencies_histogram_->Add(problem); |
| 99 } |
| 100 |
| 101 void HistogramDeltaSerialization::UniqueInconsistencyDetected( |
| 102 HistogramBase::Inconsistency problem) { |
| 103 inconsistencies_unique_histogram_->Add(problem); |
| 104 } |
| 105 |
| 106 void HistogramDeltaSerialization::InconsistencyDetectedInLoggedCount( |
| 107 int amount) { |
| 108 inconsistent_snapshot_histogram_->Add(std::abs(amount)); |
| 109 } |
| 110 |
| 111 } // namespace base |
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