1 /*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #ifndef API_CORE_PLUGIN_IINTERFACE_HELPER_H
17 #define API_CORE_PLUGIN_IINTERFACE_HELPER_H
18
19 #include <atomic>
20
21 #include <base/util/uid.h>
22 #include <core/plugin/intf_interface.h>
23
CORE_BEGIN_NAMESPACE()24 CORE_BEGIN_NAMESPACE()
25 namespace Internal {
26 template<typename Me, typename Interface, typename... Interfaces>
27 const CORE_NS::IInterface* GetInterface(const Me* me, const BASE_NS::Uid& uid)
28 {
29 if (uid == Interface::UID) {
30 return static_cast<const Interface*>(me);
31 }
32 if constexpr (sizeof...(Interfaces) > 0) {
33 return GetInterface<Me, Interfaces...>(me, uid);
34 } else {
35 return nullptr;
36 }
37 }
38 } // namespace Internal
39
40 template<typename... Interfaces>
41 class IInterfaceHelper : public Interfaces... {
42 public:
GetInterface(const BASE_NS::Uid & uid)43 const IInterface* GetInterface(const BASE_NS::Uid& uid) const override
44 {
45 if (uid == CORE_NS::IInterface::UID) {
46 return static_cast<const CORE_NS::IInterface*>(static_cast<const void*>(this));
47 }
48 return Internal::GetInterface<IInterfaceHelper, Interfaces...>(this, uid);
49 }
GetInterface(const BASE_NS::Uid & uid)50 IInterface* GetInterface(const BASE_NS::Uid& uid) override
51 {
52 if (uid == CORE_NS::IInterface::UID) {
53 return static_cast<CORE_NS::IInterface*>(static_cast<void*>(this));
54 }
55 return const_cast<CORE_NS::IInterface*>(Internal::GetInterface<IInterfaceHelper, Interfaces...>(this, uid));
56 }
57
Ref()58 void Ref() override
59 {
60 refcnt_.fetch_add(1, std::memory_order_relaxed);
61 }
62
Unref()63 void Unref() override
64 {
65 if (std::atomic_fetch_sub_explicit(&refcnt_, 1, std::memory_order_release) == 1) {
66 std::atomic_thread_fence(std::memory_order_acquire);
67 delete this;
68 }
69 }
70
71 protected:
72 std::atomic<int32_t> refcnt_ { 0 };
73 };
74 CORE_END_NAMESPACE()
75
76 #endif // API_CORE_PLUGIN_IINTERFACE_HELPER_H