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// Copyright (c) 2012 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/prefs/pref_notifier_impl.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "components/prefs/pref_service.h"
PrefNotifierImpl::PrefNotifierImpl() : pref_service_(nullptr) {}
PrefNotifierImpl::PrefNotifierImpl(PrefService* service)
: pref_service_(service) {
}
PrefNotifierImpl::~PrefNotifierImpl() {
DCHECK(thread_checker_.CalledOnValidThread());
// Verify that there are no pref observers when we shut down.
for (const auto& observer_list : pref_observers_) {
if (observer_list.second->begin() != observer_list.second->end())
LOG(WARNING) << "Pref observer found at shutdown.";
}
// Same for initialization observers.
if (!init_observers_.empty())
LOG(WARNING) << "Init observer found at shutdown.";
pref_observers_.clear();
init_observers_.clear();
}
void PrefNotifierImpl::AddPrefObserver(const std::string& path,
PrefObserver* obs) {
// Get the pref observer list associated with the path.
PrefObserverList* observer_list = nullptr;
auto observer_iterator = pref_observers_.find(path);
if (observer_iterator == pref_observers_.end()) {
observer_list = new PrefObserverList;
pref_observers_[path] = base::WrapUnique(observer_list);
} else {
observer_list = observer_iterator->second.get();
}
// Add the pref observer. ObserverList will DCHECK if it already is
// in the list.
observer_list->AddObserver(obs);
}
void PrefNotifierImpl::RemovePrefObserver(const std::string& path,
PrefObserver* obs) {
DCHECK(thread_checker_.CalledOnValidThread());
auto observer_iterator = pref_observers_.find(path);
if (observer_iterator == pref_observers_.end()) {
return;
}
PrefObserverList* observer_list = observer_iterator->second.get();
observer_list->RemoveObserver(obs);
}
void PrefNotifierImpl::AddInitObserver(base::Callback<void(bool)> obs) {
init_observers_.push_back(obs);
}
void PrefNotifierImpl::OnPreferenceChanged(const std::string& path) {
FireObservers(path);
}
void PrefNotifierImpl::OnInitializationCompleted(bool succeeded) {
DCHECK(thread_checker_.CalledOnValidThread());
// We must make a copy of init_observers_ and clear it before we run
// observers, or we can end up in this method re-entrantly before
// clearing the observers list.
PrefInitObserverList observers(init_observers_);
init_observers_.clear();
for (auto& observer : observers)
observer.Run(succeeded);
}
void PrefNotifierImpl::FireObservers(const std::string& path) {
DCHECK(thread_checker_.CalledOnValidThread());
// Only send notifications for registered preferences.
if (!pref_service_->FindPreference(path))
return;
auto observer_iterator = pref_observers_.find(path);
if (observer_iterator == pref_observers_.end())
return;
for (PrefObserver& observer : *(observer_iterator->second))
observer.OnPreferenceChanged(pref_service_, path);
}
void PrefNotifierImpl::SetPrefService(PrefService* pref_service) {
DCHECK(pref_service_ == nullptr);
pref_service_ = pref_service;
}
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