1 // Copyright 2022 gRPC authors.
2 //
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 #ifndef GRPC_SRC_CORE_LIB_EVENT_ENGINE_COMMON_CLOSURES_H
16 #define GRPC_SRC_CORE_LIB_EVENT_ENGINE_COMMON_CLOSURES_H
17 
18 #include <grpc/support/port_platform.h>
19 
20 #include <utility>
21 
22 #include "absl/functional/any_invocable.h"
23 
24 #include <grpc/event_engine/event_engine.h>
25 
26 namespace grpc_event_engine {
27 namespace experimental {
28 
29 class AnyInvocableClosure : public EventEngine::Closure {
30  public:
AnyInvocableClosure(absl::AnyInvocable<void ()> cb)31   explicit AnyInvocableClosure(absl::AnyInvocable<void()> cb)
32       : cb_(std::move(cb)) {}
Run()33   void Run() override { cb_(); }
34 
35  private:
36   absl::AnyInvocable<void()> cb_;
37 };
38 
39 class SelfDeletingClosure : public EventEngine::Closure {
40  public:
41   // Creates a SelfDeletingClosure.
42   // The closure will be deleted after Run is called.
Create(absl::AnyInvocable<void ()> cb)43   static Closure* Create(absl::AnyInvocable<void()> cb) {
44     return new SelfDeletingClosure(std::move(cb), nullptr);
45   }
46   // Creates a SelfDeletingClosure with a custom destructor.
Create(absl::AnyInvocable<void ()> cb,absl::AnyInvocable<void ()> dest_cb)47   static Closure* Create(absl::AnyInvocable<void()> cb,
48                          absl::AnyInvocable<void()> dest_cb) {
49     return new SelfDeletingClosure(std::move(cb), std::move(dest_cb));
50   }
~SelfDeletingClosure()51   ~SelfDeletingClosure() override {
52     if (dest_cb_) dest_cb_();
53   };
54 
Run()55   void Run() override {
56     cb_();
57     delete this;
58   }
59 
60  private:
SelfDeletingClosure(absl::AnyInvocable<void ()> cb,absl::AnyInvocable<void ()> dest_cb)61   explicit SelfDeletingClosure(absl::AnyInvocable<void()> cb,
62                                absl::AnyInvocable<void()> dest_cb)
63       : cb_(std::move(cb)), dest_cb_(std::move(dest_cb)) {}
64   absl::AnyInvocable<void()> cb_;
65   absl::AnyInvocable<void()> dest_cb_;
66 };
67 
68 }  // namespace experimental
69 }  // namespace grpc_event_engine
70 
71 #endif  // GRPC_SRC_CORE_LIB_EVENT_ENGINE_COMMON_CLOSURES_H
72