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86 lines
2.2 KiB
86 lines
2.2 KiB
/*
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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 <utility>
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#include "base/callback_list.h"
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#include "os/handler.h"
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/* This file contains CallbackList implementation that will execute callback on provided Handler thread
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Example usage inside your class:
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private:
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common::CallbackList<void(int)> callbacks_list_;
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public:
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std::unique_ptr<common::CallbackList<void(int)>::Subscription> RegisterCallback(
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const base::RepeatingCallback<void(int)>& cb, os::Handler* handler) {
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return callbacks_list_.Add({cb, handler});
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}
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void NotifyAllCallbacks(int value) {
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callbacks_list_.Notify(value);
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}
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*/
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namespace bluetooth {
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namespace common {
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namespace {
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template <typename CallbackType>
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struct CallbackWithHandler {
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CallbackWithHandler(base::RepeatingCallback<CallbackType> callback, os::Handler* handler)
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: callback(callback), handler(handler) {}
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bool is_null() const {
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return callback.is_null();
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}
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void Reset() {
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callback.Reset();
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}
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base::RepeatingCallback<CallbackType> callback;
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os::Handler* handler;
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};
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} // namespace
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template <typename Sig>
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class CallbackList;
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template <typename... Args>
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class CallbackList<void(Args...)> : public base::internal::CallbackListBase<CallbackWithHandler<void(Args...)>> {
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public:
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using CallbackType = CallbackWithHandler<void(Args...)>;
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CallbackList() = default;
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template <typename... RunArgs>
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void Notify(RunArgs&&... args) {
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auto it = this->GetIterator();
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CallbackType* cb;
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while ((cb = it.GetNext()) != nullptr) {
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cb->handler->Post(base::Bind(cb->callback, args...));
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}
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}
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private:
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DISALLOW_COPY_AND_ASSIGN(CallbackList);
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};
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} // namespace common
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} // namespace bluetooth
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