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// Copyright 2016 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 "chrome/browser/lifetime/keep_alive_registry.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/lifetime/application_lifetime.h"
#include "chrome/browser/lifetime/keep_alive_state_observer.h"
#include "chrome/browser/lifetime/keep_alive_types.h"
////////////////////////////////////////////////////////////////////////////////
// Public methods
// static
KeepAliveRegistry* KeepAliveRegistry::GetInstance() {
return base::Singleton<KeepAliveRegistry>::get();
}
bool KeepAliveRegistry::IsKeepingAlive() const {
return registered_count_ > 0;
}
bool KeepAliveRegistry::IsRestartAllowed() const {
return registered_count_ == restart_allowed_count_;
}
bool KeepAliveRegistry::IsOriginRegistered(KeepAliveOrigin origin) const {
return registered_keep_alives_.find(origin) != registered_keep_alives_.end();
}
void KeepAliveRegistry::AddObserver(KeepAliveStateObserver* observer) {
observers_.AddObserver(observer);
}
void KeepAliveRegistry::RemoveObserver(KeepAliveStateObserver* observer) {
observers_.RemoveObserver(observer);
}
////////////////////////////////////////////////////////////////////////////////
// Private methods
KeepAliveRegistry::KeepAliveRegistry()
: registered_count_(0), restart_allowed_count_(0) {}
KeepAliveRegistry::~KeepAliveRegistry() {
DLOG_IF(ERROR, registered_count_ > 0 || registered_keep_alives_.size() > 0)
<< "KeepAliveRegistry not empty at destruction time. State: " << *this;
}
void KeepAliveRegistry::Register(KeepAliveOrigin origin,
KeepAliveRestartOption restart) {
bool old_keeping_alive = IsKeepingAlive();
bool old_restart_allowed = IsRestartAllowed();
++registered_keep_alives_[origin];
++registered_count_;
if (restart == KeepAliveRestartOption::ENABLED)
++restart_allowed_count_;
bool new_keeping_alive = IsKeepingAlive();
bool new_restart_allowed = IsRestartAllowed();
if (new_keeping_alive != old_keeping_alive)
OnKeepAliveStateChanged(new_keeping_alive);
if (new_restart_allowed != old_restart_allowed)
OnRestartAllowedChanged(new_restart_allowed);
DVLOG(1) << "New state of the KeepAliveRegistry: " << *this;
}
void KeepAliveRegistry::Unregister(KeepAliveOrigin origin,
KeepAliveRestartOption restart) {
bool old_keeping_alive = IsKeepingAlive();
bool old_restart_allowed = IsRestartAllowed();
--registered_count_;
DCHECK_GE(registered_count_, 0);
int new_count = --registered_keep_alives_[origin];
DCHECK_GE(registered_keep_alives_[origin], 0);
if (new_count == 0)
registered_keep_alives_.erase(origin);
if (restart == KeepAliveRestartOption::ENABLED)
--restart_allowed_count_;
bool new_keeping_alive = IsKeepingAlive();
bool new_restart_allowed = IsRestartAllowed();
if (new_restart_allowed != old_restart_allowed)
OnRestartAllowedChanged(new_restart_allowed);
if (new_keeping_alive != old_keeping_alive)
OnKeepAliveStateChanged(new_keeping_alive);
DVLOG(1) << "New state of the KeepAliveRegistry: " << *this;
}
void KeepAliveRegistry::OnKeepAliveStateChanged(bool new_keeping_alive) {
DVLOG(1) << "Notifying KeepAliveStateObservers: KeepingAlive changed to: "
<< new_keeping_alive;
FOR_EACH_OBSERVER(KeepAliveStateObserver, observers_,
OnKeepAliveStateChanged(new_keeping_alive));
}
void KeepAliveRegistry::OnRestartAllowedChanged(bool new_restart_allowed) {
DVLOG(1) << "Notifying KeepAliveStateObservers: Restart changed to: "
<< new_restart_allowed;
FOR_EACH_OBSERVER(KeepAliveStateObserver, observers_,
OnKeepAliveRestartStateChanged(new_restart_allowed));
}
#ifndef NDEBUG
std::ostream& operator<<(std::ostream& out, const KeepAliveRegistry& registry) {
out << "{registered_count_=" << registry.registered_count_
<< ", restart_allowed_count_=" << registry.restart_allowed_count_
<< ", KeepAlives=[";
for (auto counts_per_origin_it : registry.registered_keep_alives_) {
if (counts_per_origin_it != *registry.registered_keep_alives_.begin())
out << ", ";
out << counts_per_origin_it.first << " (" << counts_per_origin_it.second
<< ")";
}
out << "]}";
return out;
}
#endif // ndef NDEBUG
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