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// Copyright 2014 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 "components/copresence/handlers/audio/audio_directive_list.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/default_tick_clock.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
namespace copresence {
// Public methods.
AudioDirective::AudioDirective() {
}
AudioDirective::AudioDirective(const std::string& op_id,
base::TimeTicks end_time)
: op_id(op_id), end_time(end_time) {
}
AudioDirectiveList::AudioDirectiveList() : clock_(new base::DefaultTickClock) {
}
AudioDirectiveList::~AudioDirectiveList() {
}
void AudioDirectiveList::AddDirective(const std::string& op_id,
base::TimeDelta ttl) {
base::TimeTicks end_time = clock_->NowTicks() + ttl;
// In case this op is already in the list, update it instead of adding
// it again.
std::vector<AudioDirective>::iterator it = FindDirectiveByOpId(op_id);
if (it != active_directives_.end()) {
it->end_time = end_time;
std::make_heap(active_directives_.begin(),
active_directives_.end(),
LatestFirstComparator());
return;
}
active_directives_.push_back(AudioDirective(op_id, end_time));
std::push_heap(active_directives_.begin(),
active_directives_.end(),
LatestFirstComparator());
}
void AudioDirectiveList::RemoveDirective(const std::string& op_id) {
std::vector<AudioDirective>::iterator it = FindDirectiveByOpId(op_id);
if (it != active_directives_.end())
active_directives_.erase(it);
std::make_heap(active_directives_.begin(),
active_directives_.end(),
LatestFirstComparator());
}
scoped_ptr<AudioDirective> AudioDirectiveList::GetActiveDirective() {
// The top is always the instruction that is ending the latest. If that time
// has passed, means all our previous instructions have expired too, hence
// clear the list.
if (!active_directives_.empty() &&
active_directives_.front().end_time < clock_->NowTicks()) {
active_directives_.clear();
}
if (active_directives_.empty())
return make_scoped_ptr<AudioDirective>(NULL);
return make_scoped_ptr(new AudioDirective(active_directives_.front()));
}
std::vector<AudioDirective>::iterator AudioDirectiveList::FindDirectiveByOpId(
const std::string& op_id) {
for (std::vector<AudioDirective>::iterator it = active_directives_.begin();
it != active_directives_.end();
++it) {
if (it->op_id == op_id)
return it;
}
return active_directives_.end();
}
} // namespace copresence
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