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// Copyright (c) 2010 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/prefs/pref_notifier.h"
#include "base/stl_util-inl.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/policy/configuration_policy_pref_store.h"
#include "chrome/browser/prefs/pref_service.h"
#include "chrome/browser/prefs/pref_value_store.h"
#include "chrome/common/notification_service.h"
PrefNotifier::PrefNotifier(PrefService* service, PrefValueStore* value_store)
: pref_service_(service),
pref_value_store_(value_store) {
registrar_.Add(this,
NotificationType(NotificationType::POLICY_CHANGED),
NotificationService::AllSources());
}
PrefNotifier::~PrefNotifier() {
DCHECK(CalledOnValidThread());
// Verify that there are no pref observers when we shut down.
for (PrefObserverMap::iterator it = pref_observers_.begin();
it != pref_observers_.end(); ++it) {
NotificationObserverList::Iterator obs_iterator(*(it->second));
if (obs_iterator.GetNext()) {
LOG(WARNING) << "pref observer found at shutdown " << it->first;
}
}
STLDeleteContainerPairSecondPointers(pref_observers_.begin(),
pref_observers_.end());
pref_observers_.clear();
}
void PrefNotifier::OnPreferenceSet(const char* pref_name,
PrefNotifier::PrefStoreType new_store) {
if (pref_value_store_->PrefHasChanged(pref_name, new_store))
FireObservers(pref_name);
}
void PrefNotifier::OnUserPreferenceSet(const char* pref_name) {
OnPreferenceSet(pref_name, PrefNotifier::USER_STORE);
}
void PrefNotifier::FireObservers(const char* path) {
DCHECK(CalledOnValidThread());
// Convert path to a std::string because the Details constructor requires a
// class.
std::string path_str(path);
PrefObserverMap::iterator observer_iterator = pref_observers_.find(path_str);
if (observer_iterator == pref_observers_.end())
return;
NotificationObserverList::Iterator it(*(observer_iterator->second));
NotificationObserver* observer;
while ((observer = it.GetNext()) != NULL) {
observer->Observe(NotificationType::PREF_CHANGED,
Source<PrefService>(pref_service_),
Details<std::string>(&path_str));
}
}
void PrefNotifier::AddPrefObserver(const char* path,
NotificationObserver* obs) {
// Get the pref observer list associated with the path.
NotificationObserverList* observer_list = NULL;
PrefObserverMap::iterator observer_iterator = pref_observers_.find(path);
if (observer_iterator == pref_observers_.end()) {
observer_list = new NotificationObserverList;
pref_observers_[path] = observer_list;
} else {
observer_list = observer_iterator->second;
}
// Verify that this observer doesn't already exist.
NotificationObserverList::Iterator it(*observer_list);
NotificationObserver* existing_obs;
while ((existing_obs = it.GetNext()) != NULL) {
DCHECK(existing_obs != obs) << path << " observer already registered";
if (existing_obs == obs)
return;
}
// Ok, safe to add the pref observer.
observer_list->AddObserver(obs);
}
void PrefNotifier::RemovePrefObserver(const char* path,
NotificationObserver* obs) {
DCHECK(CalledOnValidThread());
PrefObserverMap::iterator observer_iterator = pref_observers_.find(path);
if (observer_iterator == pref_observers_.end()) {
return;
}
NotificationObserverList* observer_list = observer_iterator->second;
observer_list->RemoveObserver(obs);
}
void PrefNotifier::FireObserversForRefreshedManagedPrefs(
std::vector<std::string> changed_prefs_paths) {
DCHECK(CalledOnValidThread());
std::vector<std::string>::const_iterator current;
for (current = changed_prefs_paths.begin();
current != changed_prefs_paths.end();
++current) {
FireObservers(current->c_str());
}
}
void PrefNotifier::Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details) {
using policy::ConfigurationPolicyPrefStore;
if (type == NotificationType::POLICY_CHANGED) {
PrefValueStore::AfterRefreshCallback* callback =
NewCallback(this,
&PrefNotifier::FireObserversForRefreshedManagedPrefs);
// The notification of the policy refresh can come from any thread,
// but the manipulation of the PrefValueStore must happen on the UI
// thread, thus the policy refresh must be explicitly started on it.
ChromeThread::PostTask(
ChromeThread::UI, FROM_HERE,
NewRunnableMethod(
pref_value_store_,
&PrefValueStore::RefreshPolicyPrefs,
ConfigurationPolicyPrefStore::CreateManagedPolicyPrefStore(),
ConfigurationPolicyPrefStore::CreateRecommendedPolicyPrefStore(),
callback));
}
}
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