sync/internal_api/public/attachments/attachment_store_frontend.h

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_STORE_FRONTEND_H_
   6 #define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_STORE_FRONTEND_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/threading/non_thread_safe.h"
  11 #include "sync/api/attachments/attachment_store.h"
  12
  13 namespace base {
  14 class SequencedTaskRunner;
  15 }  // namespace base
  16
  17 namespace syncer {
  18
  19 class AttachmentStoreBackend;
  20
  21 // AttachmentStoreFrontend is helper to post AttachmentStore calls to backend on
  22 // different thread. Backend is expected to know on which thread to post
  23 // callbacks with results.
  24 // AttachmentStoreFrontend takes ownership of backend. Backend is deleted on
  25 // backend thread.
  26 // AttachmentStoreFrontend is not thread safe, it should only be accessed from
  27 // model thread.
  28 // Method signatures of AttachmentStoreFrontend match exactly methods of
  29 // AttachmentStoreBackend.
  30 class SYNC_EXPORT AttachmentStoreFrontend
  31     : public base::RefCounted<AttachmentStoreFrontend>,
  32       public base::NonThreadSafe {
  33  public:
  34   AttachmentStoreFrontend(
  35       scoped_ptr<AttachmentStoreBackend> backend,
  36       const scoped_refptr<base::SequencedTaskRunner>& backend_task_runner);
  37
  38   void Init(const AttachmentStore::InitCallback& callback);
  39
  40   void Read(const AttachmentIdList& ids,
  41             const AttachmentStore::ReadCallback& callback);
  42
  43   void Write(AttachmentStore::Component component,
  44              const AttachmentList& attachments,
  45              const AttachmentStore::WriteCallback& callback);
  46   void SetReference(AttachmentStore::Component component,
  47                     const AttachmentIdList& ids);
  48   void DropReference(AttachmentStore::Component component,
  49                      const AttachmentIdList& ids,
  50                      const AttachmentStore::DropCallback& callback);
  51
  52   void ReadMetadata(const AttachmentIdList& ids,
  53                     const AttachmentStore::ReadMetadataCallback& callback);
  54
  55   void ReadAllMetadata(AttachmentStore::Component component,
  56                        const AttachmentStore::ReadMetadataCallback& callback);
  57
  58  private:
  59   friend class base::RefCounted<AttachmentStoreFrontend>;
  60   virtual ~AttachmentStoreFrontend();
  61
  62   scoped_ptr<AttachmentStoreBackend> backend_;
  63   scoped_refptr<base::SequencedTaskRunner> backend_task_runner_;
  64
  65   DISALLOW_COPY_AND_ASSIGN(AttachmentStoreFrontend);
  66 };
  67
  68 }  // namespace syncer
  69
  70 #endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_STORE_FRONTEND_H_