Index: base/metrics/histogram_delta_serialization.cc |
diff --git a/base/metrics/histogram_delta_serialization.cc b/base/metrics/histogram_delta_serialization.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..924916db76e462b38ee08da5e15c369d845b07ef |
--- /dev/null |
+++ b/base/metrics/histogram_delta_serialization.cc |
@@ -0,0 +1,111 @@ |
+// Copyright 2013 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 "base/metrics/histogram_delta_serialization.h" |
+ |
+#include "base/logging.h" |
+#include "base/metrics/histogram_base.h" |
+#include "base/metrics/histogram_snapshot_manager.h" |
+#include "base/pickle.h" |
+#include "base/safe_numerics.h" |
+#include "base/values.h" |
+ |
+namespace base { |
+ |
+namespace { |
+ |
+// Create or find existing histogram and add the samples from pickle. |
+// Silently returns when seeing any data problem in the pickle. |
+void DeserializeHistogramAndAddSamples(PickleIterator* iter) { |
+ HistogramBase* histogram = DeserializeHistogramInfo(iter); |
+ if (!histogram) |
+ return; |
+ |
+ if (histogram->flags() & HistogramBase::kIPCSerializationSourceFlag) { |
+ DVLOG(1) << "Single process mode, histogram observed and not copied: " |
+ << histogram->histogram_name(); |
+ return; |
+ } |
+ histogram->AddSamplesFromPickle(iter); |
+} |
+ |
+} // namespace |
+ |
+HistogramDeltaSerialization::HistogramDeltaSerialization( |
+ const std::string& caller_name) |
+ : histogram_snapshot_manager_(this), |
+ serialized_deltas_(NULL) { |
+ inconsistencies_histogram_ = |
+ LinearHistogram::FactoryGet( |
+ "Histogram.Inconsistencies" + caller_name, 1, |
+ HistogramBase::NEVER_EXCEEDED_VALUE, |
+ HistogramBase::NEVER_EXCEEDED_VALUE + 1, |
+ HistogramBase::kUmaTargetedHistogramFlag); |
+ |
+ inconsistencies_unique_histogram_ = |
+ LinearHistogram::FactoryGet( |
+ "Histogram.Inconsistencies" + caller_name + "Unique", 1, |
+ HistogramBase::NEVER_EXCEEDED_VALUE, |
+ HistogramBase::NEVER_EXCEEDED_VALUE + 1, |
+ HistogramBase::kUmaTargetedHistogramFlag); |
+ |
+ inconsistent_snapshot_histogram_ = |
+ Histogram::FactoryGet( |
+ "Histogram.InconsistentSnapshot" + caller_name, 1, 1000000, 50, |
+ HistogramBase::kUmaTargetedHistogramFlag); |
+} |
+ |
+HistogramDeltaSerialization::~HistogramDeltaSerialization() { |
+} |
+ |
+void HistogramDeltaSerialization::PrepareAndSerializeDeltas( |
+ std::vector<std::string>* serialized_deltas) { |
+ serialized_deltas_ = serialized_deltas; |
+ // Note: Before serializing, we set the kIPCSerializationSourceFlag for all |
+ // the histograms, so that the receiving process can distinguish them from the |
+ // local histograms. |
+ histogram_snapshot_manager_.PrepareDeltas( |
+ Histogram::kIPCSerializationSourceFlag, false); |
+ serialized_deltas_ = NULL; |
+} |
+ |
+// static |
+void HistogramDeltaSerialization::DeserializeAndAddSamples( |
+ const std::vector<std::string>& serialized_deltas) { |
+ for (std::vector<std::string>::const_iterator it = serialized_deltas.begin(); |
+ it != serialized_deltas.end(); ++it) { |
+ Pickle pickle(it->data(), checked_numeric_cast<int>(it->size())); |
+ PickleIterator iter(pickle); |
+ DeserializeHistogramAndAddSamples(&iter); |
+ } |
+} |
+ |
+void HistogramDeltaSerialization::RecordDelta( |
+ const HistogramBase& histogram, |
+ const HistogramSamples& snapshot) { |
+ DCHECK_NE(0, snapshot.TotalCount()); |
+ |
+ Pickle pickle; |
+ histogram.SerializeInfo(&pickle); |
+ snapshot.Serialize(&pickle); |
+ serialized_deltas_->push_back( |
+ std::string(static_cast<const char*>(pickle.data()), pickle.size())); |
+} |
+ |
+void HistogramDeltaSerialization::InconsistencyDetected( |
+ HistogramBase::Inconsistency problem) { |
+ inconsistencies_histogram_->Add(problem); |
+} |
+ |
+void HistogramDeltaSerialization::UniqueInconsistencyDetected( |
+ HistogramBase::Inconsistency problem) { |
+ inconsistencies_unique_histogram_->Add(problem); |
+} |
+ |
+void HistogramDeltaSerialization::InconsistencyDetectedInLoggedCount( |
+ int amount) { |
+ inconsistent_snapshot_histogram_->Add(std::abs(amount)); |
+} |
+ |
+} // namespace base |