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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_API_ATTACHMENTS_ATTACHMENT_STORE_BACKEND_H_ | |
6 #define SYNC_API_ATTACHMENTS_ATTACHMENT_STORE_BACKEND_H_ | |
7 | |
8 #include "base/callback.h" | |
9 #include "base/macros.h" | |
10 #include "base/memory/ref_counted.h" | |
11 #include "sync/api/attachments/attachment.h" | |
12 #include "sync/api/attachments/attachment_id.h" | |
13 #include "sync/api/attachments/attachment_store.h" | |
14 #include "sync/base/sync_export.h" | |
15 | |
16 namespace base { | |
17 class SequencedTaskRunner; | |
18 } // namespace base | |
19 | |
20 namespace syncer { | |
21 | |
22 // Interface for AttachmentStore backends. | |
23 // | |
24 // AttachmentStoreBackend provides interface for different backends (on-disk, | |
25 // in-memory). Factory methods in AttachmentStore create corresponding backend | |
26 // and pass reference to AttachmentStore. | |
27 // All functions in AttachmentStoreBackend mirror corresponding functions in | |
28 // AttachmentStore. | |
29 // All callbacks and result codes are used directly from AttachmentStore. | |
30 // AttachmentStoreFrontend only passes callbacks and results without modifying | |
31 // them, there is no need to declare separate set. | |
32 class SYNC_EXPORT AttachmentStoreBackend { | |
33 public: | |
34 explicit AttachmentStoreBackend( | |
35 const scoped_refptr<base::SequencedTaskRunner>& callback_task_runner); | |
36 virtual ~AttachmentStoreBackend(); | |
37 virtual void Init(const AttachmentStore::InitCallback& callback) = 0; | |
38 virtual void Read(AttachmentStore::Component component, | |
39 const AttachmentIdList& ids, | |
40 const AttachmentStore::ReadCallback& callback) = 0; | |
41 virtual void Write(AttachmentStore::Component component, | |
42 const AttachmentList& attachments, | |
43 const AttachmentStore::WriteCallback& callback) = 0; | |
44 virtual void SetReference(AttachmentStore::Component component, | |
45 const AttachmentIdList& ids) = 0; | |
46 virtual void DropReference(AttachmentStore::Component component, | |
47 const AttachmentIdList& ids, | |
48 const AttachmentStore::DropCallback& callback) = 0; | |
49 virtual void ReadMetadataById( | |
50 AttachmentStore::Component component, | |
51 const AttachmentIdList& ids, | |
52 const AttachmentStore::ReadMetadataCallback& callback) = 0; | |
53 virtual void ReadMetadata( | |
54 AttachmentStore::Component component, | |
55 const AttachmentStore::ReadMetadataCallback& callback) = 0; | |
56 | |
57 protected: | |
58 // Helper function to post callback on callback_task_runner. | |
59 void PostCallback(const base::Closure& callback); | |
60 | |
61 private: | |
62 scoped_refptr<base::SequencedTaskRunner> callback_task_runner_; | |
63 | |
64 DISALLOW_COPY_AND_ASSIGN(AttachmentStoreBackend); | |
65 }; | |
66 | |
67 } // namespace syncer | |
68 | |
69 #endif // SYNC_API_ATTACHMENTS_ATTACHMENT_STORE_BACKEND_H_ | |
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