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