[Sync] Introduce AttachmentStoreForSync class

sync/api/attachments/attachment_store.cc

 // Copyright 2014 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 "sync/api/attachments/attachment_store.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop.h"
 #include "base/sequenced_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "sync/internal_api/public/attachments/attachment_store_frontend.h"
 #include "sync/internal_api/public/attachments/in_memory_attachment_store.h"
 #include "sync/internal_api/public/attachments/on_disk_attachment_store.h"
 
 namespace syncer {
 
+namespace {
+
+void NoOpDropCallback(const AttachmentStore::Result& result) {
+}
+}
+
 AttachmentStore::AttachmentStore(
     const scoped_refptr<AttachmentStoreFrontend>& frontend,
-    AttachmentReferrer referrer)
-    : frontend_(frontend), referrer_(referrer) {
+    Component component)
+    : frontend_(frontend), component_(component) {
 }
 
 AttachmentStore::~AttachmentStore() {
 }
 
 void AttachmentStore::Read(const AttachmentIdList& ids,
                            const ReadCallback& callback) {
   frontend_->Read(ids, callback);
 }
 
 void AttachmentStore::Write(const AttachmentList& attachments,
                             const WriteCallback& callback) {
-  frontend_->Write(referrer_, attachments, callback);
+  frontend_->Write(component_, attachments, callback);
 }
 
 void AttachmentStore::Drop(const AttachmentIdList& ids,
                            const DropCallback& callback) {
-  frontend_->Drop(referrer_, ids, callback);
+  frontend_->DropReference(component_, ids, callback);
 }
 
 void AttachmentStore::ReadMetadata(const AttachmentIdList& ids,
                                    const ReadMetadataCallback& callback) {
   frontend_->ReadMetadata(ids, callback);
 }
 
 void AttachmentStore::ReadAllMetadata(const ReadMetadataCallback& callback) {
-  frontend_->ReadAllMetadata(referrer_, callback);
+  frontend_->ReadAllMetadata(component_, callback);
 }
 
-scoped_ptr<AttachmentStore> AttachmentStore::CreateAttachmentStoreForSync()
-    const {
-  scoped_ptr<AttachmentStore> attachment_store(
-      new AttachmentStore(frontend_, SYNC));
-  return attachment_store.Pass();
+scoped_ptr<AttachmentStoreForSync>
+AttachmentStore::CreateAttachmentStoreForSync() const {
+  scoped_ptr<AttachmentStoreForSync> attachment_store_for_sync(
+      new AttachmentStoreForSync(frontend_, component_, SYNC));
+  return attachment_store_for_sync.Pass();
 }
 
 scoped_ptr<AttachmentStore> AttachmentStore::CreateInMemoryStore() {
   // Both frontend and backend of attachment store will live on current thread.
   scoped_refptr<base::SingleThreadTaskRunner> runner;
   if (base::ThreadTaskRunnerHandle::IsSet()) {
     runner = base::ThreadTaskRunnerHandle::Get();
   } else {
     // Dummy runner for tests that don't have MessageLoop.
     base::MessageLoop loop;
@@ skipping 29 matching lines @@
     scoped_ptr<AttachmentStoreBackend> backend) {
   scoped_refptr<base::SingleThreadTaskRunner> runner =
       base::ThreadTaskRunnerHandle::Get();
   scoped_refptr<AttachmentStoreFrontend> attachment_store_frontend(
       new AttachmentStoreFrontend(backend.Pass(), runner));
   scoped_ptr<AttachmentStore> attachment_store(
       new AttachmentStore(attachment_store_frontend, MODEL_TYPE));
   return attachment_store.Pass();
 }
 
+AttachmentStoreForSync::AttachmentStoreForSync(
+    const scoped_refptr<AttachmentStoreFrontend>& frontend,
+    Component consumer_component,
+    Component sync_component)
+    : AttachmentStore(frontend, consumer_component),
+      sync_component_(sync_component) {
+}
+
+void AttachmentStoreForSync::SetSyncReference(const AttachmentIdList& ids) {
+  frontend()->SetReference(sync_component_, ids);
+}
+
+void AttachmentStoreForSync::DropSyncReference(const AttachmentIdList& ids) {
+  frontend()->DropReference(sync_component_, ids,
+                            base::Bind(&NoOpDropCallback));
+}
+
 }  // namespace syncer