| /* |
| * Copyright 2019 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #pragma once |
| |
| #include "common/bind.h" |
| #include "common/callback.h" |
| |
| namespace bluetooth { |
| namespace common { |
| |
| class IPostableContext { |
| public: |
| virtual ~IPostableContext(){}; |
| virtual void Post(OnceClosure closure) = 0; |
| }; |
| |
| template <typename R, typename... Args> |
| class ContextualOnceCallback; |
| |
| // A callback bound to an execution context that can be invoked only once. |
| template <typename R, typename... Args> |
| class ContextualOnceCallback<R(Args...)> { |
| public: |
| ContextualOnceCallback(common::OnceCallback<R(Args...)>&& callback, IPostableContext* context) |
| : callback_(std::move(callback)), context_(context) {} |
| |
| constexpr ContextualOnceCallback() = default; |
| |
| DISALLOW_COPY_AND_ASSIGN(ContextualOnceCallback); |
| |
| ContextualOnceCallback(ContextualOnceCallback&&) noexcept = default; |
| ContextualOnceCallback& operator=(ContextualOnceCallback&&) noexcept = default; |
| |
| void Invoke(Args... args) { |
| context_->Post(common::BindOnce(std::move(callback_), std::forward<Args>(args)...)); |
| } |
| |
| void InvokeIfNotEmpty(Args... args) { |
| if (context_ != nullptr) { |
| context_->Post(common::BindOnce(std::move(callback_), std::forward<Args>(args)...)); |
| } |
| } |
| |
| bool IsEmpty() { |
| return context_ == nullptr; |
| } |
| |
| private: |
| common::OnceCallback<R(Args...)> callback_; |
| IPostableContext* context_; |
| }; |
| |
| template <typename R, typename... Args> |
| class ContextualCallback; |
| |
| // A callback bound to an execution context that can be invoked multiple times. |
| template <typename R, typename... Args> |
| class ContextualCallback<R(Args...)> { |
| public: |
| ContextualCallback(common::Callback<R(Args...)>&& callback, IPostableContext* context) |
| : callback_(std::move(callback)), context_(context) {} |
| |
| constexpr ContextualCallback() = default; |
| |
| ContextualCallback(const ContextualCallback&) = default; |
| ContextualCallback& operator=(const ContextualCallback&) = default; |
| ContextualCallback(ContextualCallback&&) noexcept = default; |
| ContextualCallback& operator=(ContextualCallback&&) noexcept = default; |
| |
| void Invoke(Args... args) { |
| context_->Post(common::BindOnce(callback_, std::forward<Args>(args)...)); |
| } |
| |
| void InvokeIfNotEmpty(Args... args) { |
| if (context_ != nullptr) { |
| context_->Post(common::BindOnce(callback_, std::forward<Args>(args)...)); |
| } |
| } |
| |
| bool IsEmpty() { |
| return context_ == nullptr; |
| } |
| |
| private: |
| common::Callback<R(Args...)> callback_; |
| IPostableContext* context_; |
| }; |
| |
| } // namespace common |
| } // namespace bluetooth |