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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef SYNC_SYNCABLE_ENTRY_PROTO_FIELD_PTR_H_ | 5 #ifndef SYNC_SYNCABLE_ENTRY_PROTO_FIELD_PTR_H_ |
6 #define SYNC_SYNCABLE_ENTRY_PROTO_FIELD_PTR_H_ | 6 #define SYNC_SYNCABLE_ENTRY_PROTO_FIELD_PTR_H_ |
7 | 7 |
8 #include "base/gtest_prod_util.h" | 8 #include "base/gtest_prod_util.h" |
9 #include "base/memory/ref_counted.h" | 9 #include "base/memory/ref_counted.h" |
10 | 10 |
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45 // Copying ProtoValuePtr results in ref-counted sharing of the | 45 // Copying ProtoValuePtr results in ref-counted sharing of the |
46 // underlying wrapper and the value contained in the wrapper. | 46 // underlying wrapper and the value contained in the wrapper. |
47 // | 47 // |
48 // The public interface includes only immutable access to the wrapped value. | 48 // The public interface includes only immutable access to the wrapped value. |
49 // The only way to assign a value to ProtoValuePtr is through a | 49 // The only way to assign a value to ProtoValuePtr is through a |
50 // private SetValue function which is called from EntryKernel. That results | 50 // private SetValue function which is called from EntryKernel. That results |
51 // in stopping sharing the previous value and creating a wrapper to the new | 51 // in stopping sharing the previous value and creating a wrapper to the new |
52 // value. | 52 // value. |
53 template <typename T, typename Traits = DefaultProtoValuePtrTraits<T>> | 53 template <typename T, typename Traits = DefaultProtoValuePtrTraits<T>> |
54 class ProtoValuePtr { | 54 class ProtoValuePtr { |
55 TYPE_WITH_MOVE_CONSTRUCTOR_FOR_CPP_03(ProtoValuePtr) | |
56 | |
57 private: | 55 private: |
58 // Immutable shareable ref-counted wrapper that embeds the value. | 56 // Immutable shareable ref-counted wrapper that embeds the value. |
59 class Wrapper : public base::RefCountedThreadSafe<Wrapper> { | 57 class Wrapper : public base::RefCountedThreadSafe<Wrapper> { |
60 public: | 58 public: |
61 Wrapper(const T& value) { Traits::CopyValue(&value_, value); } | 59 Wrapper(const T& value) { Traits::CopyValue(&value_, value); } |
62 Wrapper(T* value) { Traits::SwapValue(&value_, value); } | 60 Wrapper(T* value) { Traits::SwapValue(&value_, value); } |
63 | 61 |
64 const T& value() const { return value_; } | 62 const T& value() const { return value_; } |
65 // Create wrapper by deserializing a BLOB. | 63 // Create wrapper by deserializing a BLOB. |
66 static Wrapper* ParseFromBlob(const void* blob, int length) { | 64 static Wrapper* ParseFromBlob(const void* blob, int length) { |
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121 void load(const void* blob, int length) { | 119 void load(const void* blob, int length) { |
122 wrapper_ = Wrapper::ParseFromBlob(blob, length); | 120 wrapper_ = Wrapper::ParseFromBlob(blob, length); |
123 } | 121 } |
124 | 122 |
125 scoped_refptr<Wrapper> wrapper_; | 123 scoped_refptr<Wrapper> wrapper_; |
126 }; | 124 }; |
127 | 125 |
128 } // namespace syncer | 126 } // namespace syncer |
129 | 127 |
130 #endif // SYNC_SYNCABLE_ENTRY_PROTO_FIELD_PTR_H_ | 128 #endif // SYNC_SYNCABLE_ENTRY_PROTO_FIELD_PTR_H_ |
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