[Sync] Refactor AttachmentStore classes. Introduce concept of referrer.

sync/internal_api/attachments/attachment_service_impl.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/internal_api/public/attachments/attachment_service_impl.h"
 
 #include <iterator>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 92 matching lines @@
     // All requests completed. Let's notify consumer.
     GetOrDownloadResult result =
         unavailable_attachments_.empty() ? GET_SUCCESS : GET_UNSPECIFIED_ERROR;
     base::MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(callback_, result, base::Passed(&retrieved_attachments_)));
   }
 }
 
 AttachmentServiceImpl::AttachmentServiceImpl(
-    scoped_refptr<AttachmentStore> attachment_store,
+    scoped_ptr<AttachmentStore> attachment_store,
     scoped_ptr<AttachmentUploader> attachment_uploader,
     scoped_ptr<AttachmentDownloader> attachment_downloader,
     Delegate* delegate,
     const base::TimeDelta& initial_backoff_delay,
     const base::TimeDelta& max_backoff_delay)
-    : attachment_store_(attachment_store),
+    : attachment_store_(attachment_store.Pass()),
       attachment_uploader_(attachment_uploader.Pass()),
       attachment_downloader_(attachment_downloader.Pass()),
       delegate_(delegate),
       weak_ptr_factory_(this) {
   DCHECK(CalledOnValidThread());
   DCHECK(attachment_store_.get());
 
   // TODO(maniscalco): Observe network connectivity change events.  When the
   // network becomes disconnected, consider suspending queue dispatch.  When
   // connectivity is restored, consider clearing any dispatch backoff (bug
   // 411981).
   upload_task_queue_.reset(new TaskQueue<AttachmentId>(
       base::Bind(&AttachmentServiceImpl::BeginUpload,
                  weak_ptr_factory_.GetWeakPtr()),
       initial_backoff_delay,
       max_backoff_delay));
 
   net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
 }
 
 AttachmentServiceImpl::~AttachmentServiceImpl() {
   DCHECK(CalledOnValidThread());
   net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
 }
 
 // Static.
 scoped_ptr<syncer::AttachmentService> AttachmentServiceImpl::CreateForTest() {
-  scoped_refptr<syncer::AttachmentStore> attachment_store =
+  scoped_ptr<syncer::AttachmentStore> attachment_store =
       AttachmentStore::CreateInMemoryStore();
   scoped_ptr<AttachmentUploader> attachment_uploader(
       new FakeAttachmentUploader);
   scoped_ptr<AttachmentDownloader> attachment_downloader(
       new FakeAttachmentDownloader());
   scoped_ptr<syncer::AttachmentService> attachment_service(
-      new syncer::AttachmentServiceImpl(attachment_store,
+      new syncer::AttachmentServiceImpl(attachment_store.Pass(),
                                         attachment_uploader.Pass(),
                                         attachment_downloader.Pass(),
                                         NULL,
                                         base::TimeDelta(),
                                         base::TimeDelta()));
   return attachment_service.Pass();
 }
 
-AttachmentStore* AttachmentServiceImpl::GetStore() {
-  return attachment_store_.get();
-}
-
 void AttachmentServiceImpl::GetOrDownloadAttachments(
     const AttachmentIdList& attachment_ids,
     const GetOrDownloadCallback& callback) {
   DCHECK(CalledOnValidThread());
   scoped_refptr<GetOrDownloadState> state(
       new GetOrDownloadState(attachment_ids, callback));
   attachment_store_->Read(attachment_ids,
                           base::Bind(&AttachmentServiceImpl::ReadDone,
-                                     weak_ptr_factory_.GetWeakPtr(),
-                                     state));
+                                     weak_ptr_factory_.GetWeakPtr(), state));
 }
 
 void AttachmentServiceImpl::ReadDone(
     const scoped_refptr<GetOrDownloadState>& state,
     const AttachmentStore::Result& result,
     scoped_ptr<AttachmentMap> attachments,
     scoped_ptr<AttachmentIdList> unavailable_attachment_ids) {
   // Add read attachments to result.
   for (AttachmentMap::const_iterator iter = attachments->begin();
        iter != attachments->end();
@@ skipping 133 matching lines @@
         base::Bind(&AttachmentServiceImpl::UploadDone,
                    weak_ptr_factory_.GetWeakPtr()));
   }
 }
 
 void AttachmentServiceImpl::SetTimerForTest(scoped_ptr<base::Timer> timer) {
   upload_task_queue_->SetTimerForTest(timer.Pass());
 }
 
 }  // namespace syncer