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