[Sync] Move attachments code out of core/.

components/sync/core/attachments/attachment_service_impl.h

-// 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.
-
-#ifndef COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
-#define COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_
-
-#include <deque>
-#include <memory>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/weak_ptr.h"
-#include "base/threading/non_thread_safe.h"
-#include "components/sync/api/attachments/attachment_store.h"
-#include "components/sync/core/attachments/attachment_downloader.h"
-#include "components/sync/core/attachments/attachment_service.h"
-#include "components/sync/core/attachments/attachment_service_proxy.h"
-#include "components/sync/core/attachments/attachment_uploader.h"
-#include "components/sync/core/attachments/task_queue.h"
-#include "net/base/network_change_notifier.h"
-
-namespace syncer {
-
-// Implementation of AttachmentService.
-class AttachmentServiceImpl
-    : public AttachmentService,
-      public net::NetworkChangeNotifier::NetworkChangeObserver,
-      public base::NonThreadSafe {
- public:
-  // |attachment_store| is required. UploadAttachments reads attachment data
-  // from it. Downloaded attachments will be written into it.
-  //
-  // |attachment_uploader| is optional. If null, attachments will never be
-  // uploaded to the sync server and |delegate|'s OnAttachmentUploaded will
-  // never be invoked.
-  //
-  // |attachment_downloader| is optional. If null, attachments will never be
-  // downloaded. Only attachments in |attachment_store| will be returned from
-  // GetOrDownloadAttachments.
-  //
-  // |delegate| is optional delegate for AttachmentService to notify about
-  // asynchronous events (AttachmentUploaded). Pass NULL if delegate is not
-  // provided. AttachmentService doesn't take ownership of delegate, the pointer
-  // must be valid throughout AttachmentService lifetime.
-  //
-  // |initial_backoff_delay| the initial delay between upload attempts.  This
-  // class automatically retries failed uploads.  After the first failure, it
-  // will wait this amount of time until it tries again.  After each failure,
-  // the delay is doubled until the |max_backoff_delay| is reached.  A
-  // successful upload clears the delay.
-  //
-  // |max_backoff_delay| the maxmium delay between upload attempts when backed
-  // off.
-  AttachmentServiceImpl(
-      std::unique_ptr<AttachmentStoreForSync> attachment_store,
-      std::unique_ptr<AttachmentUploader> attachment_uploader,
-      std::unique_ptr<AttachmentDownloader> attachment_downloader,
-      Delegate* delegate,
-      const base::TimeDelta& initial_backoff_delay,
-      const base::TimeDelta& max_backoff_delay);
-  ~AttachmentServiceImpl() override;
-
-  // Create an AttachmentServiceImpl suitable for use in tests.
-  static std::unique_ptr<AttachmentService> CreateForTest();
-
-  // AttachmentService implementation.
-  void GetOrDownloadAttachments(const AttachmentIdList& attachment_ids,
-                                const GetOrDownloadCallback& callback) override;
-  void UploadAttachments(const AttachmentIdList& attachment_ids) override;
-
-  // NetworkChangeObserver implementation.
-  void OnNetworkChanged(
-      net::NetworkChangeNotifier::ConnectionType type) override;
-
-  // Use |timer| in the underlying TaskQueue.
-  //
-  // Used in tests.  See also MockTimer.
-  void SetTimerForTest(std::unique_ptr<base::Timer> timer);
-
- private:
-  class GetOrDownloadState;
-
-  void ReadDone(const scoped_refptr<GetOrDownloadState>& state,
-                const AttachmentStore::Result& result,
-                std::unique_ptr<AttachmentMap> attachments,
-                std::unique_ptr<AttachmentIdList> unavailable_attachment_ids);
-  void WriteDone(const scoped_refptr<GetOrDownloadState>& state,
-                 const Attachment& attachment,
-                 const AttachmentStore::Result& result);
-  void UploadDone(const AttachmentUploader::UploadResult& result,
-                  const AttachmentId& attachment_id);
-  void DownloadDone(const scoped_refptr<GetOrDownloadState>& state,
-                    const AttachmentId& attachment_id,
-                    const AttachmentDownloader::DownloadResult& result,
-                    std::unique_ptr<Attachment> attachment);
-  void BeginUpload(const AttachmentId& attachment_id);
-  void ReadDoneNowUpload(
-      const AttachmentStore::Result& result,
-      std::unique_ptr<AttachmentMap> attachments,
-      std::unique_ptr<AttachmentIdList> unavailable_attachment_ids);
-
-  std::unique_ptr<AttachmentStoreForSync> attachment_store_;
-
-  // May be null.
-  const std::unique_ptr<AttachmentUploader> attachment_uploader_;
-
-  // May be null.
-  const std::unique_ptr<AttachmentDownloader> attachment_downloader_;
-
-  // May be null.
-  Delegate* delegate_;
-
-  std::unique_ptr<TaskQueue<AttachmentId>> upload_task_queue_;
-
-  // Must be last data member.
-  base::WeakPtrFactory<AttachmentServiceImpl> weak_ptr_factory_;
-
-  DISALLOW_COPY_AND_ASSIGN(AttachmentServiceImpl);
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_SERVICE_IMPL_H_