/*
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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 <functional>
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#include <memory>
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#include <mutex>
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#include <queue>
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#include "os/thread.h"
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#include "os/utils.h"
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namespace bluetooth {
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namespace os {
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// A message-queue style handler for reactor-based thread to handle incoming events from different threads. When it's
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// constructed, it will register a reactable on the specified thread; when it's destroyed, it will unregister itself
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// from the thread.
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class Handler {
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public:
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// Create and register a handler on given thread
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explicit Handler(Thread* thread);
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// Unregister this handler from the thread and release resource. Unhandled events will be discarded and not executed.
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~Handler();
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DISALLOW_COPY_AND_ASSIGN(Handler);
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// Enqueue a closure to the queue of this handler
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void Post(Closure closure);
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// Remove all pending events from the queue of this handler
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void Clear();
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private:
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std::queue<Closure> tasks_;
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Thread* thread_;
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int fd_;
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Reactor::Reactable* reactable_;
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mutable std::mutex mutex_;
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void handle_next_event();
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};
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} // namespace os
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} // namespace bluetooth
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