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// Copyright 2012 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/prefs/pref_notifier_impl.h"
#include "base/debug/alias.h"
#include "base/debug/dump_without_crashing.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/observer_list.h"
#include "base/strings/strcat.h"
#include "components/prefs/pref_service.h"
PrefNotifierImpl::PrefNotifierImpl() : pref_service_(nullptr) {}
PrefNotifierImpl::PrefNotifierImpl(PrefService* service)
: pref_service_(service) {
}
PrefNotifierImpl::~PrefNotifierImpl() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Verify that there are no initialization observers.
if (!init_observers_.empty())
LOG(WARNING) << "Init observer found at shutdown.";
init_observers_.clear();
}
void PrefNotifierImpl::AddPrefObserver(std::string_view path,
PrefObserver* obs) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_);
// Add the pref observer. ObserverList hits a DCHECK if it already is
// in the list.
pref_observers_[std::string(path)].AddObserver(obs);
}
void PrefNotifierImpl::RemovePrefObserver(std::string_view path,
PrefObserver* obs) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_);
auto iterator = pref_observers_.find(path);
if (iterator == pref_observers_.end()) {
return;
}
iterator->second.RemoveObserver(obs);
}
void PrefNotifierImpl::AddPrefObserverAllPrefs(PrefObserver* observer) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_);
all_prefs_pref_observers_.AddObserver(observer);
}
void PrefNotifierImpl::RemovePrefObserverAllPrefs(PrefObserver* observer) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_);
all_prefs_pref_observers_.RemoveObserver(observer);
}
void PrefNotifierImpl::AddInitObserver(base::OnceCallback<void(bool)> obs) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
init_observers_.push_back(std::move(obs));
}
void PrefNotifierImpl::OnPreferenceChanged(std::string_view path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_);
FireObservers(path);
}
void PrefNotifierImpl::OnInitializationCompleted(bool succeeded) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// We must move init_observers_ to a local variable before we run
// observers, or we can end up in this method re-entrantly before
// clearing the observers list.
PrefInitObserverList observers;
std::swap(observers, init_observers_);
for (auto& observer : observers)
std::move(observer).Run(succeeded);
}
void PrefNotifierImpl::FireObservers(std::string_view path) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_);
// Only send notifications for registered preferences.
if (!pref_service_->FindPreference(path))
return;
// Fire observers for any preference change.
for (PrefObserver& pref_observer : all_prefs_pref_observers_) {
pref_observer.OnPreferenceChanged(pref_service_, path);
}
auto iterator = pref_observers_.find(path);
if (iterator != pref_observers_.end()) {
for (PrefObserver& observer : iterator->second) {
observer.OnPreferenceChanged(pref_service_, path);
}
}
}
void PrefNotifierImpl::SetPrefService(PrefService* pref_service) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_ == nullptr);
pref_service_ = pref_service;
}
void PrefNotifierImpl::OnServiceDestroyed() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(pref_service_);
for (PrefObserver& pref_observer : all_prefs_pref_observers_) {
pref_observer.OnServiceDestroyed(pref_service_);
}
DCHECK(all_prefs_pref_observers_.empty());
for (auto& [_, observer_list] : pref_observers_) {
for (PrefObserver& pref_observer : observer_list) {
pref_observer.OnServiceDestroyed(pref_service_);
}
DCHECK(observer_list.empty());
}
pref_observers_.clear();
pref_service_ = nullptr;
}
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