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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/keep_alive_registry/keep_alive_registry.h"
#include "base/logging.h"
#include "base/observer_list.h"
#include "components/keep_alive_registry/keep_alive_state_observer.h"
#include "components/keep_alive_registry/keep_alive_types.h"
////////////////////////////////////////////////////////////////////////////////
// Public methods
// static
KeepAliveRegistry* KeepAliveRegistry::GetInstance() {
return base::Singleton<KeepAliveRegistry>::get();
}
bool KeepAliveRegistry::IsKeepingAlive() const {
return registered_count_ > 0 && !(IsRestartAllowed() && is_restarting_);
}
bool KeepAliveRegistry::IsKeepingAliveOnlyByBrowserOrigin() const {
for (const auto& value : registered_keep_alives_) {
if (value.first != KeepAliveOrigin::BROWSER)
return false;
}
return true;
}
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);
}
bool KeepAliveRegistry::WouldRestartWithout(
const std::vector<KeepAliveOrigin>& origins) const {
int registered_count = 0;
int restart_allowed_count = 0;
for (auto origin : origins) {
auto counts_it = registered_keep_alives_.find(origin);
if (counts_it != registered_keep_alives_.end()) {
registered_count += counts_it->second;
counts_it = restart_allowed_keep_alives_.find(origin);
if (counts_it != restart_allowed_keep_alives_.end())
restart_allowed_count += counts_it->second;
} else {
// |registered_keep_alives_| is supposed to be a superset of
// |restart_allowed_keep_alives_|
DCHECK(restart_allowed_keep_alives_.find(origin) ==
restart_allowed_keep_alives_.end());
}
}
registered_count = registered_count_ - registered_count;
restart_allowed_count = restart_allowed_count_ - restart_allowed_count;
DCHECK_GE(registered_count, 0);
DCHECK_GE(restart_allowed_count, 0);
return registered_count == restart_allowed_count;
}
bool KeepAliveRegistry::IsShuttingDown() const {
return is_shutting_down_;
}
void KeepAliveRegistry::SetIsShuttingDown(bool value) {
is_shutting_down_ = value;
}
bool KeepAliveRegistry::IsRestarting() const {
return is_restarting_;
}
void KeepAliveRegistry::SetRestarting() {
bool old_keeping_alive = IsKeepingAlive();
is_restarting_ = true;
bool new_keeping_alive = IsKeepingAlive();
// keep alive state can be updated by |is_restarting_| change.
// If that happens, notify observers.
if (old_keeping_alive != new_keeping_alive)
OnKeepAliveStateChanged(new_keeping_alive);
}
////////////////////////////////////////////////////////////////////////////////
// Private methods
KeepAliveRegistry::KeepAliveRegistry()
: registered_count_(0), restart_allowed_count_(0) {}
KeepAliveRegistry::~KeepAliveRegistry() {
DCHECK_LE(registered_count_, 0) << "KeepAliveRegistry state:" << *this;
DCHECK_EQ(registered_keep_alives_.size(), 0u)
<< "KeepAliveRegistry state:" << *this;
}
void KeepAliveRegistry::Register(KeepAliveOrigin origin,
KeepAliveRestartOption restart) {
CHECK(!is_shutting_down_);
bool old_keeping_alive = IsKeepingAlive();
bool old_restart_allowed = IsRestartAllowed();
++registered_keep_alives_[origin];
++registered_count_;
if (restart == KeepAliveRestartOption::ENABLED) {
++restart_allowed_keep_alives_[origin];
++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);
DecrementCount(origin, ®istered_keep_alives_);
if (restart == KeepAliveRestartOption::ENABLED) {
--restart_allowed_count_;
DecrementCount(origin, &restart_allowed_keep_alives_);
}
bool new_keeping_alive = IsKeepingAlive();
bool new_restart_allowed = IsRestartAllowed();
// Update the KeepAlive state first, so that listeners can check if we are
// trying to shutdown.
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::OnKeepAliveStateChanged(bool new_keeping_alive) {
DVLOG(1) << "Notifying KeepAliveStateObservers: KeepingAlive changed to: "
<< new_keeping_alive;
for (KeepAliveStateObserver& observer : observers_)
observer.OnKeepAliveStateChanged(new_keeping_alive);
}
void KeepAliveRegistry::OnRestartAllowedChanged(bool new_restart_allowed) {
DVLOG(1) << "Notifying KeepAliveStateObservers: Restart changed to: "
<< new_restart_allowed;
for (KeepAliveStateObserver& observer : observers_)
observer.OnKeepAliveRestartStateChanged(new_restart_allowed);
}
void KeepAliveRegistry::DecrementCount(KeepAliveOrigin origin,
OriginMap* keep_alive_map) {
int new_count = --keep_alive_map->at(origin);
DCHECK_GE(keep_alive_map->at(origin), 0);
if (new_count == 0)
keep_alive_map->erase(origin);
}
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;
}
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