pagespeed/kernel/base/countdown_timer.cc

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 "pagespeed/kernel/base/countdown_timer.h"

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/timer.h"

namespace net_instaweb {

CountdownTimer::CountdownTimer(Timer* timer, void* user_data,
                               int64 allowed_time_ms)
    : timer_(timer),
      user_data_(user_data),
      limit_time_us_(0),
      start_time_us_(0) {
  Reset(allowed_time_ms);
}

void CountdownTimer::Reset(int64 allowed_time_ms) {
  start_time_us_ = timer_->NowUs();
  limit_time_us_ = ((allowed_time_ms >= 0) && (timer_ != nullptr))
                       ? start_time_us_ + 1000 * allowed_time_ms
                       : 0;
}

bool CountdownTimer::HaveTimeLeft() const {
  return (limit_time_us_ == 0) || (timer_->NowUs() < limit_time_us_);
}

int64 CountdownTimer::TimeLeftMs() const {
  return (limit_time_us_ == 0) ? 0 : (limit_time_us_ - timer_->NowUs()) / 1000;
}

int64 CountdownTimer::TimeElapsedMs() const {
  return (timer_->NowUs() - start_time_us_) / 1000;
}

}  // namespace net_instaweb