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// 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 "ui/base/latency_info.h"
#include <algorithm>
namespace ui {
LatencyInfo::LatencyInfo() {
}
LatencyInfo::~LatencyInfo() {
}
void LatencyInfo::MergeWith(const LatencyInfo& other) {
for (LatencyMap::const_iterator it = other.latency_components.begin();
it != other.latency_components.end();
++it) {
AddLatencyNumberWithTimestamp(it->first.first,
it->first.second,
it->second.sequence_number,
it->second.event_time,
it->second.event_count);
}
}
void LatencyInfo::AddNewLatencyFrom(const LatencyInfo& other) {
for (LatencyMap::const_iterator it = other.latency_components.begin();
it != other.latency_components.end();
++it) {
if (!FindLatency(it->first.first, it->first.second, NULL)) {
AddLatencyNumberWithTimestamp(it->first.first,
it->first.second,
it->second.sequence_number,
it->second.event_time,
it->second.event_count);
}
}
}
void LatencyInfo::AddLatencyNumber(LatencyComponentType component,
int64 id,
int64 component_sequence_number) {
AddLatencyNumberWithTimestamp(component, id, component_sequence_number,
base::TimeTicks::HighResNow(), 1);
}
void LatencyInfo::AddLatencyNumberWithTimestamp(LatencyComponentType component,
int64 id,
int64 component_sequence_number,
base::TimeTicks time,
uint32 event_count) {
LatencyMap::key_type key = std::make_pair(component, id);
LatencyMap::iterator it = latency_components.find(key);
if (it == latency_components.end()) {
LatencyComponent info = {component_sequence_number, time, event_count};
latency_components[key] = info;
return;
}
it->second.sequence_number = std::max(component_sequence_number,
it->second.sequence_number);
uint32 new_count = event_count + it->second.event_count;
if (event_count > 0 && new_count != 0) {
// Do a weighted average, so that the new event_time is the average of
// the times of events currently in this structure with the time passed
// into this method.
it->second.event_time += (time - it->second.event_time) * event_count /
new_count;
it->second.event_count = new_count;
}
}
bool LatencyInfo::FindLatency(LatencyComponentType type,
int64 id,
LatencyComponent* output) const {
LatencyMap::const_iterator it = latency_components.find(
std::make_pair(type, id));
if (it == latency_components.end())
return false;
if (output)
*output = it->second;
return true;
}
void LatencyInfo::Clear() {
latency_components.clear();
}
} // namespace ui
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