Move extensions storage API implementation to src/extensions

chrome/browser/extensions/api/storage/settings_frontend.cc

-// Copyright (c) 2012 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/extensions/api/storage/settings_frontend.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/files/file_path.h"
-#include "base/json/json_reader.h"
-#include "base/lazy_instance.h"
-#include "chrome/browser/extensions/api/storage/leveldb_settings_storage_factory.h"
-#include "chrome/browser/extensions/api/storage/local_value_store_cache.h"
-#include "chrome/common/extensions/api/storage.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/browser_thread.h"
-#include "extensions/browser/api/extensions_api_client.h"
-#include "extensions/browser/event_router.h"
-#include "extensions/browser/extension_registry.h"
-#include "extensions/browser/extension_system.h"
-
-using content::BrowserContext;
-using content::BrowserThread;
-
-namespace extensions {
-
-namespace {
-
-base::LazyInstance<BrowserContextKeyedAPIFactory<SettingsFrontend> > g_factory =
-    LAZY_INSTANCE_INITIALIZER;
-
-// Settings change Observer which forwards changes on to the extension
-// processes for |context| and its incognito partner if it exists.
-class DefaultObserver : public SettingsObserver {
- public:
-  explicit DefaultObserver(BrowserContext* context)
-      : browser_context_(context) {}
-
-  // SettingsObserver implementation.
-  virtual void OnSettingsChanged(
-      const std::string& extension_id,
-      settings_namespace::Namespace settings_namespace,
-      const std::string& change_json) OVERRIDE {
-    // TODO(gdk): This is a temporary hack while the refactoring for
-    // string-based event payloads is removed. http://crbug.com/136045
-    scoped_ptr<base::ListValue> args(new base::ListValue());
-    args->Append(base::JSONReader::Read(change_json));
-    args->Append(new base::StringValue(settings_namespace::ToString(
-        settings_namespace)));
-    scoped_ptr<Event> event(new Event(
-        api::storage::OnChanged::kEventName, args.Pass()));
-    ExtensionSystem::Get(browser_context_)->event_router()->
-        DispatchEventToExtension(extension_id, event.Pass());
-  }
-
- private:
-  BrowserContext* const browser_context_;
-};
-
-}  // namespace
-
-// static
-SettingsFrontend* SettingsFrontend::Get(BrowserContext* context) {
-  return BrowserContextKeyedAPIFactory<SettingsFrontend>::Get(context);
-}
-
-// static
-SettingsFrontend* SettingsFrontend::CreateForTesting(
-    const scoped_refptr<SettingsStorageFactory>& storage_factory,
-    BrowserContext* context) {
-  return new SettingsFrontend(storage_factory, context);
-}
-
-SettingsFrontend::SettingsFrontend(BrowserContext* context)
-    : browser_context_(context) {
-  Init(new LeveldbSettingsStorageFactory());
-}
-
-SettingsFrontend::SettingsFrontend(
-    const scoped_refptr<SettingsStorageFactory>& factory,
-    BrowserContext* context)
-    : browser_context_(context) {
-  Init(factory);
-}
-
-void SettingsFrontend::Init(
-    const scoped_refptr<SettingsStorageFactory>& factory) {
-  observers_ = new SettingsObserverList();
-  browser_context_observer_.reset(new DefaultObserver(browser_context_));
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK(!browser_context_->IsOffTheRecord());
-
-  observers_->AddObserver(browser_context_observer_.get());
-
-  caches_[settings_namespace::LOCAL] =
-      new LocalValueStoreCache(factory, browser_context_->GetPath());
-
-  // Add any additional caches the embedder supports (for example, caches
-  // for chrome.storage.managed and chrome.storage.sync).
-  ExtensionsAPIClient::Get()->AddAdditionalValueStoreCaches(
-      browser_context_, factory, observers_, &caches_);
-}
-
-SettingsFrontend::~SettingsFrontend() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  observers_->RemoveObserver(browser_context_observer_.get());
-  for (CacheMap::iterator it = caches_.begin(); it != caches_.end(); ++it) {
-    ValueStoreCache* cache = it->second;
-    cache->ShutdownOnUI();
-    BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE, cache);
-  }
-}
-
-ValueStoreCache* SettingsFrontend::GetValueStoreCache(
-    settings_namespace::Namespace settings_namespace) const {
-  CacheMap::const_iterator it = caches_.find(settings_namespace);
-  if (it != caches_.end())
-    return it->second;
-  return NULL;
-}
-
-bool SettingsFrontend::IsStorageEnabled(
-    settings_namespace::Namespace settings_namespace) const {
-  return caches_.find(settings_namespace) != caches_.end();
-}
-
-void SettingsFrontend::RunWithStorage(
-    scoped_refptr<const Extension> extension,
-    settings_namespace::Namespace settings_namespace,
-    const ValueStoreCache::StorageCallback& callback) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  CHECK(extension.get());
-
-  ValueStoreCache* cache = caches_[settings_namespace];
-  CHECK(cache);
-
-  BrowserThread::PostTask(
-      BrowserThread::FILE, FROM_HERE,
-      base::Bind(&ValueStoreCache::RunWithValueStoreForExtension,
-                 base::Unretained(cache), callback, extension));
-}
-
-void SettingsFrontend::DeleteStorageSoon(
-    const std::string& extension_id) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  for (CacheMap::iterator it = caches_.begin(); it != caches_.end(); ++it) {
-    ValueStoreCache* cache = it->second;
-    BrowserThread::PostTask(
-        BrowserThread::FILE, FROM_HERE,
-        base::Bind(&ValueStoreCache::DeleteStorageSoon,
-                   base::Unretained(cache),
-                   extension_id));
-  }
-}
-
-scoped_refptr<SettingsObserverList> SettingsFrontend::GetObservers() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  return observers_;
-}
-
-void SettingsFrontend::DisableStorageForTesting(
-    settings_namespace::Namespace settings_namespace) {
-  CacheMap::iterator it = caches_.find(settings_namespace);
-  if (it != caches_.end()) {
-    ValueStoreCache* cache = it->second;
-    cache->ShutdownOnUI();
-    BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE, cache);
-    caches_.erase(it);
-  }
-}
-
-// BrowserContextKeyedAPI implementation.
-
-// static
-BrowserContextKeyedAPIFactory<SettingsFrontend>*
-SettingsFrontend::GetFactoryInstance() {
-  return g_factory.Pointer();
-}
-
-// static
-const char* SettingsFrontend::service_name() {
-  return "SettingsFrontend";
-}
-
-}  // namespace extensions