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//
// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "shill/net/event_history.h"
#include <time.h>
#include <deque>
#include "shill/net/shill_time.h"
using std::deque;
namespace shill {
void EventHistory::RecordEvent() {
RecordEventInternal(time_->GetNow());
}
void EventHistory::ExpireEventsBefore(int seconds_ago, ClockType clock_type) {
ExpireEventsBeforeInternal(seconds_ago, time_->GetNow(), clock_type);
}
void EventHistory::RecordEventAndExpireEventsBefore(int seconds_ago,
ClockType clock_type) {
Timestamp now = time_->GetNow();
RecordEventInternal(now);
ExpireEventsBeforeInternal(seconds_ago, now, clock_type);
}
std::vector<std::string> EventHistory::ExtractWallClockToStrings() const {
std::vector<std::string> strings;
for (deque<Timestamp>::const_iterator it = events_.begin();
it != events_.end(); ++it) {
strings.push_back(it->wall_clock);
}
return strings;
}
void EventHistory::RecordEventInternal(Timestamp now) {
events_.push_back(now);
while (!events_.empty() && max_events_specified_ &&
(events_.size() > static_cast<size_t>(max_events_saved_))) {
events_.pop_front();
}
}
void EventHistory::ExpireEventsBeforeInternal(int seconds_ago, Timestamp now,
ClockType clock_type) {
struct timeval interval = (const struct timeval){seconds_ago};
while (!events_.empty()) {
struct timeval elapsed = {0, 0};
switch (clock_type) {
case kClockTypeBoottime:
timersub(&now.boottime, &events_.front().boottime, &elapsed);
break;
case kClockTypeMonotonic:
timersub(&now.monotonic, &events_.front().monotonic, &elapsed);
break;
default: {
NOTIMPLEMENTED()
<< __func__ << ": "
<< "Invalid clock type specified - defaulting to boottime clock";
timersub(&now.boottime, &events_.front().boottime, &elapsed);
}
}
if (timercmp(&elapsed, &interval, < )) {
break;
}
events_.pop_front();
}
}
int EventHistory::CountEventsWithinInterval(int seconds_ago,
ClockType clock_type) {
int num_events_in_interval = 0;
Timestamp now = time_->GetNow();
struct timeval interval = (const struct timeval){seconds_ago};
int i = 0;
for (const auto& event : events_) {
struct timeval elapsed = {0, 0};
switch (clock_type) {
case kClockTypeBoottime:
timersub(&now.boottime, &event.boottime, &elapsed);
break;
case kClockTypeMonotonic:
timersub(&now.monotonic, &event.monotonic, &elapsed);
break;
default: {
NOTIMPLEMENTED()
<< __func__ << ": "
<< "Invalid clock type specified - defaulting to boottime clock";
timersub(&now.boottime, &event.boottime, &elapsed);
}
}
if (timercmp(&elapsed, &interval, <= )) {
num_events_in_interval = events_.size() - i;
break;
}
++i;
}
return num_events_in_interval;
}
} // namespace shill
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