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| 1 // Copyright 2014 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_SERVICE_PROXY_H_ | |
| 6 #define SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/callback.h" | |
| 10 #include "base/memory/scoped_ptr.h" | |
| 11 #include "base/memory/weak_ptr.h" | |
| 12 #include "base/sequenced_task_runner.h" | |
| 13 #include "base/task_runner.h" | |
| 14 #include "sync/api/attachments/attachment.h" | |
| 15 #include "sync/api/attachments/attachment_service.h" | |
| 16 #include "sync/base/sync_export.h" | |
| 17 | |
| 18 namespace syncer { | |
| 19 | |
| 20 class SyncData; | |
| 21 | |
| 22 // AttachmentServiceProxy wraps an AttachmentService allowing multiple threads | |
| 23 // to share the wrapped AttachmentService and invoke its methods in the | |
| 24 // appropriate thread. | |
| 25 // | |
| 26 // Callbacks passed to methods on this class will be invoked in the same thread | |
| 27 // from which the method was called. | |
| 28 // | |
| 29 // This class does not own its wrapped AttachmentService object. This class | |
| 30 // holds a WeakPtr to the wrapped object. Once the the wrapped object is | |
| 31 // destroyed, method calls on this object will be no-ops. | |
| 32 // | |
| 33 // Users of this class should take care to destroy the wrapped object on the | |
| 34 // correct thread (wrapped_task_runner). | |
| 35 // | |
| 36 // This class is thread-safe and is designed to be passed by const-ref. | |
| 37 class SYNC_EXPORT AttachmentServiceProxy : public AttachmentService { | |
| 38 public: | |
| 39 // Default copy and assignment are welcome. | |
| 40 | |
| 41 // Construct an invalid AttachmentServiceProxy. | |
| 42 AttachmentServiceProxy(); | |
| 43 | |
| 44 // Construct an AttachmentServiceProxy that forwards calls to |wrapped| on the | |
| 45 // |wrapped_task_runner| thread. | |
| 46 // | |
| 47 // Note, this object does not own |wrapped|. When |wrapped| is destroyed, | |
| 48 // calls to this object become no-ops. | |
| 49 AttachmentServiceProxy( | |
| 50 const scoped_refptr<base::SequencedTaskRunner>& wrapped_task_runner, | |
| 51 const base::WeakPtr<syncer::AttachmentService>& wrapped); | |
| 52 | |
| 53 virtual ~AttachmentServiceProxy(); | |
| 54 | |
| 55 // AttachmentService implementation. | |
| 56 virtual void GetOrDownloadAttachments( | |
| 57 const AttachmentIdList& attachment_ids, | |
| 58 const GetOrDownloadCallback& callback) OVERRIDE; | |
| 59 virtual void DropAttachments(const AttachmentIdList& attachment_ids, | |
| 60 const DropCallback& callback) OVERRIDE; | |
| 61 virtual void StoreAttachments(const AttachmentList& attachment, | |
| 62 const StoreCallback& callback) OVERRIDE; | |
| 63 | |
| 64 protected: | |
| 65 // Core does the work of proxying calls to AttachmentService methods from one | |
| 66 // thread to another so AttachmentServiceProxy can be an easy-to-use, | |
| 67 // non-ref-counted A ref-counted class. | |
| 68 // | |
| 69 // Callback from AttachmentService are proxied back using free functions | |
| 70 // defined in the .cc file (ProxyFooCallback functions). | |
| 71 // | |
| 72 // Core is ref-counted because we want to allow AttachmentServiceProxy to be | |
| 73 // copy-constructable while allowing for different implementations of Core | |
| 74 // (e.g. one type of core might own the wrapped AttachmentService). | |
| 75 // | |
| 76 // Calls to objects of this class become no-ops once its wrapped object is | |
| 77 // destroyed. | |
| 78 class SYNC_EXPORT Core : public AttachmentService, | |
| 79 public base::RefCountedThreadSafe<Core> { | |
| 80 public: | |
| 81 // Construct an AttachmentServiceProxyCore that forwards calls to |wrapped|. | |
| 82 Core(const base::WeakPtr<syncer::AttachmentService>& wrapped); | |
| 83 | |
| 84 // AttachmentService implementation. | |
| 85 virtual void GetOrDownloadAttachments( | |
| 86 const AttachmentIdList& attachment_ids, | |
| 87 const GetOrDownloadCallback& callback) OVERRIDE; | |
| 88 virtual void DropAttachments(const AttachmentIdList& attachment_ids, | |
| 89 const DropCallback& callback) OVERRIDE; | |
| 90 virtual void StoreAttachments(const AttachmentList& attachment, | |
| 91 const StoreCallback& callback) OVERRIDE; | |
| 92 | |
| 93 protected: | |
| 94 friend class base::RefCountedThreadSafe<Core>; | |
| 95 virtual ~Core(); | |
| 96 | |
| 97 private: | |
| 98 base::WeakPtr<AttachmentService> wrapped_; | |
| 99 | |
| 100 DISALLOW_COPY_AND_ASSIGN(Core); | |
| 101 }; | |
| 102 | |
| 103 // Used in tests to create an AttachmentServiceProxy with a custom Core. | |
| 104 AttachmentServiceProxy( | |
| 105 const scoped_refptr<base::SequencedTaskRunner>& wrapped_task_runner, | |
| 106 const scoped_refptr<Core>& core); | |
| 107 | |
| 108 private: | |
| 109 scoped_refptr<base::SequencedTaskRunner> wrapped_task_runner_; | |
| 110 scoped_refptr<Core> core_; | |
| 111 }; | |
| 112 | |
| 113 } // namespace syncer | |
| 114 | |
| 115 #endif // SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_ | |
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Chromium Code Reviews
Issue 436373002:
Move non-API code out of sync/api/attachments/ (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src