We started redesigning GpuMemoryBuffer interface to handle multiple buffers [0].
[chromium-blink-merge.git] / sync / api / attachments / attachment_store_backend.h
blob73bc0fbf16e1c8a005d896c0b5db8373c991a16e
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.
5 #ifndef SYNC_API_ATTACHMENTS_ATTACHMENT_STORE_BACKEND_H_
6 #define SYNC_API_ATTACHMENTS_ATTACHMENT_STORE_BACKEND_H_
8 #include "base/callback.h"
9 #include "base/memory/ref_counted.h"
10 #include "sync/api/attachments/attachment.h"
11 #include "sync/api/attachments/attachment_id.h"
12 #include "sync/api/attachments/attachment_store.h"
13 #include "sync/base/sync_export.h"
15 namespace base {
16 class SequencedTaskRunner;
17 } // namespace base
19 namespace syncer {
21 // Interface for AttachmentStore backends.
23 // AttachmentStoreBackend provides interface for different backends (on-disk,
24 // in-memory). Factory methods in AttachmentStore create corresponding backend
25 // and pass reference to AttachmentStore.
26 // All functions in AttachmentStoreBackend mirror corresponding functions in
27 // AttachmentStore.
28 // All callbacks and result codes are used directly from AttachmentStore.
29 // AttachmentStoreFrontend only passes callbacks and results without modifying
30 // them, there is no need to declare separate set.
31 class SYNC_EXPORT AttachmentStoreBackend {
32 public:
33 explicit AttachmentStoreBackend(
34 const scoped_refptr<base::SequencedTaskRunner>& callback_task_runner);
35 virtual ~AttachmentStoreBackend();
36 virtual void Init(const AttachmentStore::InitCallback& callback) = 0;
37 virtual void Read(const AttachmentIdList& ids,
38 const AttachmentStore::ReadCallback& callback) = 0;
39 virtual void Write(AttachmentStore::Component component,
40 const AttachmentList& attachments,
41 const AttachmentStore::WriteCallback& callback) = 0;
42 virtual void SetReference(AttachmentStore::Component component,
43 const AttachmentIdList& ids) = 0;
44 virtual void DropReference(AttachmentStore::Component component,
45 const AttachmentIdList& ids,
46 const AttachmentStore::DropCallback& callback) = 0;
47 virtual void ReadMetadata(
48 const AttachmentIdList& ids,
49 const AttachmentStore::ReadMetadataCallback& callback) = 0;
50 virtual void ReadAllMetadata(
51 AttachmentStore::Component component,
52 const AttachmentStore::ReadMetadataCallback& callback) = 0;
54 protected:
55 // Helper function to post callback on callback_task_runner.
56 void PostCallback(const base::Closure& callback);
58 private:
59 scoped_refptr<base::SequencedTaskRunner> callback_task_runner_;
61 DISALLOW_COPY_AND_ASSIGN(AttachmentStoreBackend);
64 } // namespace syncer
66 #endif // SYNC_API_ATTACHMENTS_ATTACHMENT_STORE_BACKEND_H_