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76 lines
2.3 KiB
76 lines
2.3 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 <array>
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#include "common/bind.h"
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#include "common/callback.h"
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#include "os/log.h"
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namespace bluetooth {
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namespace common {
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// Tracks an observer registration on client (observer) code. Register() returns a wrapped callback object which can
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// be passed to server's register API. Unregister() invalidates the wrapped callback so all callbacks that are posted
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// to the client handler after the client called Unregister() call and before the server processed the Unregister()
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// call on its handler, are dropped.
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// Note: Register() invalidates the previous registration.
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class SingleObserverRegistry {
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public:
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template <typename R, typename... T>
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decltype(auto) Register(Callback<R(T...)> callback) {
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session_++;
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return Bind(&SingleObserverRegistry::callback_wrapper<R, T...>, Unretained(this), session_, callback);
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}
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void Unregister() {
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session_++;
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}
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private:
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template <typename R, typename... T>
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void callback_wrapper(int session, Callback<R(T...)> callback, T... t) {
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if (session == session_) {
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callback.Run(std::forward<T>(t)...);
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}
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}
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uint8_t session_ = 0;
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};
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// Tracks observer registration for multiple event type. Each event type is represented as an integer in [0, Capacity).
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template <int Capacity = 10>
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class MultipleObserverRegistry {
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public:
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template <typename R, typename... T>
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decltype(auto) Register(int event_type, Callback<R(T...)> callback) {
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ASSERT(event_type < Capacity);
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return registry_[event_type].Register(callback);
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}
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void Unregister(int event_type) {
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ASSERT(event_type < Capacity);
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registry_[event_type].Unregister();
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}
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std::array<SingleObserverRegistry, Capacity> registry_;
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};
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} // namespace common
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} // namespace bluetooth
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