Pref service: add persistent pref store frontend and backend.

services/preferences/public/cpp/pref_store_client.cc

 // Copyright 2017 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 "services/preferences/public/cpp/pref_store_client.h"
-#include "mojo/public/cpp/bindings/strong_binding.h"
-#include "services/preferences/public/cpp/pref_store_impl.h"
+
+#include <utility>
 
 namespace prefs {
 
-PrefStoreClient::PrefStoreClient(mojom::PrefStoreConnectionPtr connection)
-    : cached_prefs_(std::move(connection->initial_prefs)),
-      initialized_(connection->is_initialized),
-      observer_binding_(this, std::move(connection->observer)) {}
-
-void PrefStoreClient::AddObserver(PrefStore::Observer* observer) {
-  observers_.AddObserver(observer);
-}
-
-void PrefStoreClient::RemoveObserver(PrefStore::Observer* observer) {
-  observers_.RemoveObserver(observer);
-}
-
-bool PrefStoreClient::HasObservers() const {
-  return observers_.might_have_observers();
-}
-
-bool PrefStoreClient::IsInitializationComplete() const {
-  return initialized_;
-}
-
-bool PrefStoreClient::GetValue(const std::string& key,
-                               const base::Value** result) const {
-  DCHECK(initialized_);
-  return cached_prefs_->Get(key, result);
-}
-
-std::unique_ptr<base::DictionaryValue> PrefStoreClient::GetValues() const {
-  DCHECK(initialized_);
-  return cached_prefs_->CreateDeepCopy();
+PrefStoreClient::PrefStoreClient(mojom::PrefStoreConnectionPtr connection) {
+  Init(std::move(connection->initial_prefs), connection->is_initialized,
+       std::move(connection->observer));
 }
 
 PrefStoreClient::~PrefStoreClient() = default;
 
-void PrefStoreClient::OnPrefChanged(const std::string& key,
-                                    std::unique_ptr<base::Value> value) {
-  bool changed = false;
-  if (!value) {  // Delete
-    if (cached_prefs_->RemovePath(key, nullptr))
-      changed = true;
-  } else {
-    const base::Value* prev;
-    if (cached_prefs_->Get(key, &prev)) {
-      if (!prev->Equals(value.get())) {
-        cached_prefs_->Set(key, std::move(value));
-        changed = true;
-      }
-    } else {
-      cached_prefs_->Set(key, std::move(value));
-      changed = true;
-    }
-  }
-  if (changed) {
-    for (Observer& observer : observers_)
-      observer.OnPrefValueChanged(key);
-  }
-}
-
-void PrefStoreClient::OnInitializationCompleted(bool succeeded) {
-  if (!initialized_) {
-    initialized_ = true;
-    for (Observer& observer : observers_)
-      observer.OnInitializationCompleted(true);
-  }
-}
-
 }  // namespace prefs