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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/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" |
| 14 |
| 15 namespace base { |
| 16 class SequencedTaskRunner; |
| 17 } // namespace base |
| 18 |
| 19 namespace syncer { |
| 20 |
| 21 // Interface for AttachmentStore backends. |
| 22 // |
| 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::AttachmentReferrer referrer, |
| 40 const AttachmentList& attachments, |
| 41 const AttachmentStore::WriteCallback& callback) = 0; |
| 42 virtual void Drop(AttachmentStore::AttachmentReferrer referrer, |
| 43 const AttachmentIdList& ids, |
| 44 const AttachmentStore::DropCallback& callback) = 0; |
| 45 virtual void ReadMetadata( |
| 46 const AttachmentIdList& ids, |
| 47 const AttachmentStore::ReadMetadataCallback& callback) = 0; |
| 48 virtual void ReadAllMetadata( |
| 49 AttachmentStore::AttachmentReferrer referrer, |
| 50 const AttachmentStore::ReadMetadataCallback& callback) = 0; |
| 51 |
| 52 protected: |
| 53 // Helper function to post callback on callback_task_runner. |
| 54 void PostCallback(const base::Closure& callback); |
| 55 |
| 56 private: |
| 57 scoped_refptr<base::SequencedTaskRunner> callback_task_runner_; |
| 58 |
| 59 DISALLOW_COPY_AND_ASSIGN(AttachmentStoreBackend); |
| 60 }; |
| 61 |
| 62 } // namespace syncer |
| 63 |
| 64 #endif // SYNC_API_ATTACHMENTS_ATTACHMENT_STORE_BACKEND_H_ |
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