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Side by Side Diff: services/preferences/public/cpp/pref_store_impl.cc

Issue 2635153002: Pref service: expose all read-only PrefStores through Mojo (Closed)
Patch Set: Address bauerb's review comments Created 3 years, 9 months ago
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1 // Copyright 2017 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 "services/preferences/public/cpp/pref_store_impl.h"
6
7 #include <memory>
8
9 #include "base/values.h"
10
11 namespace prefs {
12
13 PrefStoreImpl::PrefStoreImpl(scoped_refptr<::PrefStore> pref_store,
14 mojom::PrefStoreRequest request)
15 : backing_pref_store_(std::move(pref_store)),
16 backing_pref_store_initialized_(false),
17 binding_(this, std::move(request)) {
18 DCHECK(backing_pref_store_);
19 if (backing_pref_store_->IsInitializationComplete())
20 OnInitializationCompleted(true);
21 backing_pref_store_->AddObserver(this);
22 }
23
24 PrefStoreImpl::~PrefStoreImpl() {
25 backing_pref_store_->RemoveObserver(this);
26 }
27
28 // static
29 std::unique_ptr<PrefStoreImpl> PrefStoreImpl::Create(
30 mojom::PrefStoreRegistryPtr registry_ptr,
31 scoped_refptr<::PrefStore> pref_store,
32 PrefValueStore::PrefStoreType type) {
33 mojom::PrefStorePtr ptr;
34 auto impl = base::MakeUnique<PrefStoreImpl>(std::move(pref_store),
35 mojo::MakeRequest(&ptr));
36 registry_ptr->Register(type, std::move(ptr));
37 return impl;
38 }
39
40 void PrefStoreImpl::OnPrefValueChanged(const std::string& key) {
41 auto dictionary = base::MakeUnique<base::DictionaryValue>();
42 const base::Value* value = nullptr;
43 if (backing_pref_store_->GetValue(key, &value)) {
44 for (const auto& observer : observers_)
45 observer->OnPrefChanged(key, value->CreateDeepCopy());
46 } else {
47 for (const auto& observer : observers_)
48 observer->OnPrefChanged(key, nullptr);
49 }
50 }
51
52 void PrefStoreImpl::OnInitializationCompleted(bool succeeded) {
53 // Some pref stores call this more than once. We just ignore all calls after
54 // the first.
55 if (backing_pref_store_initialized_)
56 DCHECK(succeeded);
57 backing_pref_store_initialized_ = succeeded;
58 for (const auto& observer : observers_)
59 observer->OnInitializationCompleted(succeeded);
60 }
61
62 void PrefStoreImpl::AddObserver(const AddObserverCallback& callback) {
63 mojom::PrefStoreObserverPtr observer_ptr;
64 auto request = mojo::MakeRequest(&observer_ptr);
65 observers_.push_back(std::move(observer_ptr));
66 callback.Run(mojom::PrefStoreConnection::New(
67 std::move(request), backing_pref_store_->GetValues(),
68 backing_pref_store_->IsInitializationComplete()));
69 }
70
71 } // namespace prefs
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