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Side by Side Diff: components/prefs/pref_notifier_impl.cc

Issue 1645073005: Revert of Move base/prefs to components/prefs (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 10 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/prefs/pref_notifier_impl.h"
6
7 #include "base/logging.h"
8 #include "base/prefs/pref_service.h"
9 #include "base/stl_util.h"
10
11 PrefNotifierImpl::PrefNotifierImpl()
12 : pref_service_(NULL) {
13 }
14
15 PrefNotifierImpl::PrefNotifierImpl(PrefService* service)
16 : pref_service_(service) {
17 }
18
19 PrefNotifierImpl::~PrefNotifierImpl() {
20 DCHECK(thread_checker_.CalledOnValidThread());
21
22 // Verify that there are no pref observers when we shut down.
23 for (PrefObserverMap::iterator it = pref_observers_.begin();
24 it != pref_observers_.end(); ++it) {
25 PrefObserverList::Iterator obs_iterator(it->second);
26 if (obs_iterator.GetNext()) {
27 LOG(WARNING) << "pref observer found at shutdown " << it->first;
28 }
29 }
30
31 // Same for initialization observers.
32 if (!init_observers_.empty())
33 LOG(WARNING) << "Init observer found at shutdown.";
34
35 STLDeleteContainerPairSecondPointers(pref_observers_.begin(),
36 pref_observers_.end());
37 pref_observers_.clear();
38 init_observers_.clear();
39 }
40
41 void PrefNotifierImpl::AddPrefObserver(const std::string& path,
42 PrefObserver* obs) {
43 // Get the pref observer list associated with the path.
44 PrefObserverList* observer_list = NULL;
45 const PrefObserverMap::iterator observer_iterator =
46 pref_observers_.find(path);
47 if (observer_iterator == pref_observers_.end()) {
48 observer_list = new PrefObserverList;
49 pref_observers_[path] = observer_list;
50 } else {
51 observer_list = observer_iterator->second;
52 }
53
54 // Add the pref observer. ObserverList will DCHECK if it already is
55 // in the list.
56 observer_list->AddObserver(obs);
57 }
58
59 void PrefNotifierImpl::RemovePrefObserver(const std::string& path,
60 PrefObserver* obs) {
61 DCHECK(thread_checker_.CalledOnValidThread());
62
63 const PrefObserverMap::iterator observer_iterator =
64 pref_observers_.find(path);
65 if (observer_iterator == pref_observers_.end()) {
66 return;
67 }
68
69 PrefObserverList* observer_list = observer_iterator->second;
70 observer_list->RemoveObserver(obs);
71 }
72
73 void PrefNotifierImpl::AddInitObserver(base::Callback<void(bool)> obs) {
74 init_observers_.push_back(obs);
75 }
76
77 void PrefNotifierImpl::OnPreferenceChanged(const std::string& path) {
78 FireObservers(path);
79 }
80
81 void PrefNotifierImpl::OnInitializationCompleted(bool succeeded) {
82 DCHECK(thread_checker_.CalledOnValidThread());
83
84 // We must make a copy of init_observers_ and clear it before we run
85 // observers, or we can end up in this method re-entrantly before
86 // clearing the observers list.
87 PrefInitObserverList observers(init_observers_);
88 init_observers_.clear();
89
90 for (PrefInitObserverList::iterator it = observers.begin();
91 it != observers.end();
92 ++it) {
93 it->Run(succeeded);
94 }
95 }
96
97 void PrefNotifierImpl::FireObservers(const std::string& path) {
98 DCHECK(thread_checker_.CalledOnValidThread());
99
100 // Only send notifications for registered preferences.
101 if (!pref_service_->FindPreference(path))
102 return;
103
104 const PrefObserverMap::iterator observer_iterator =
105 pref_observers_.find(path);
106 if (observer_iterator == pref_observers_.end())
107 return;
108
109 FOR_EACH_OBSERVER(PrefObserver,
110 *(observer_iterator->second),
111 OnPreferenceChanged(pref_service_, path));
112 }
113
114 void PrefNotifierImpl::SetPrefService(PrefService* pref_service) {
115 DCHECK(pref_service_ == NULL);
116 pref_service_ = pref_service;
117 }
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