1 /*
2 * Copyright (c) 2022 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 <base/containers/atomics.h>
20 #include <base/util/uid.h>
21 #include <core/plugin/intf_interface.h>
22
CORE_BEGIN_NAMESPACE()23 CORE_BEGIN_NAMESPACE()
24 namespace Internal {
25 template<typename Me, typename Interface, typename... Interfaces>
26 const CORE_NS::IInterface* GetInterface(const Me* me, const BASE_NS::Uid& uid)
27 {
28 if (uid == Interface::UID) {
29 return static_cast<const Interface*>(me);
30 }
31 if constexpr (sizeof...(Interfaces) > 0) {
32 return GetInterface<Me, Interfaces...>(me, uid);
33 } else {
34 return nullptr;
35 }
36 }
37 } // namespace Internal
38
39 template<typename... Interfaces>
40 class IInterfaceHelper : public Interfaces... {
41 public:
GetInterface(const BASE_NS::Uid & uid)42 const IInterface* GetInterface(const BASE_NS::Uid& uid) const override
43 {
44 if (uid == CORE_NS::IInterface::UID) {
45 return static_cast<const CORE_NS::IInterface*>(static_cast<const void*>(this));
46 }
47 return Internal::GetInterface<IInterfaceHelper, Interfaces...>(this, uid);
48 }
GetInterface(const BASE_NS::Uid & uid)49 IInterface* GetInterface(const BASE_NS::Uid& uid) override
50 {
51 if (uid == CORE_NS::IInterface::UID) {
52 return static_cast<CORE_NS::IInterface*>(static_cast<void*>(this));
53 }
54 return const_cast<CORE_NS::IInterface*>(Internal::GetInterface<IInterfaceHelper, Interfaces...>(this, uid));
55 }
56
Ref()57 void Ref() override
58 {
59 BASE_NS::AtomicIncrementRelaxed(&refcnt_);
60 }
61
Unref()62 void Unref() override
63 {
64 if (BASE_NS::AtomicDecrementRelease(&refcnt_) == 0) {
65 BASE_NS::AtomicFenceAcquire();
66 delete this;
67 }
68 }
69
70 protected:
71 int32_t refcnt_ { 0 };
72 };
73 CORE_END_NAMESPACE()
74
75 #endif // API_CORE_PLUGIN_IINTERFACE_HELPER_H