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 <vector> 8 9 #include "base/metrics/histogram.h" 10 #include "base/metrics/histogram_base.h" 11 #include "base/metrics/statistics_recorder.h" 12 #include "testing/gtest/include/gtest/gtest.h" 13 14 namespace base { 15 16 TEST(HistogramDeltaSerializationTest, DeserializeHistogramAndAddSamples) { 17 StatisticsRecorder statistic_recorder; 18 HistogramDeltaSerialization serializer("HistogramDeltaSerializationTest"); 19 std::vector<std::string> deltas; 20 // Nothing was changed yet. 21 serializer.PrepareAndSerializeDeltas(&deltas); 22 EXPECT_TRUE(deltas.empty()); 23 24 HistogramBase* histogram = Histogram::FactoryGet( 25 "TestHistogram", 1, 1000, 10, HistogramBase::kIPCSerializationSourceFlag); 26 histogram->Add(1); 27 histogram->Add(10); 28 histogram->Add(100); 29 histogram->Add(1000); 30 31 serializer.PrepareAndSerializeDeltas(&deltas); 32 EXPECT_FALSE(deltas.empty()); 33 34 HistogramDeltaSerialization::DeserializeAndAddSamples(deltas); 35 36 // The histogram has kIPCSerializationSourceFlag. So samples will be ignored. 37 scoped_ptr<HistogramSamples> snapshot(histogram->SnapshotSamples()); 38 EXPECT_EQ(1, snapshot->GetCount(1)); 39 EXPECT_EQ(1, snapshot->GetCount(10)); 40 EXPECT_EQ(1, snapshot->GetCount(100)); 41 EXPECT_EQ(1, snapshot->GetCount(1000)); 42 43 // Clear kIPCSerializationSourceFlag to emulate multi-process usage. 44 histogram->ClearFlags(HistogramBase::kIPCSerializationSourceFlag); 45 HistogramDeltaSerialization::DeserializeAndAddSamples(deltas); 46 47 scoped_ptr<HistogramSamples> snapshot2(histogram->SnapshotSamples()); 48 EXPECT_EQ(2, snapshot2->GetCount(1)); 49 EXPECT_EQ(2, snapshot2->GetCount(10)); 50 EXPECT_EQ(2, snapshot2->GetCount(100)); 51 EXPECT_EQ(2, snapshot2->GetCount(1000)); 52 } 53 54 } // namespace base 55
