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/*
* Copyright (c) 2000 - 2014 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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
*/
/*
* @file descriptor-set.h
* @author Krzysztof Jackiewicz (k.jackiewicz@samsung.com)
* @version 1.0
*/
#pragma once
#include <map>
#include <functional>
#include <dpl/exception.h>
#include <poll.h>
#include <noncopyable.h>
namespace CKM {
class IDescriptorSet {
public:
// int is for descriptor, short is for revents,
typedef std::function<void(int, short)> Callback;
virtual void add(int fd, short events, Callback&& callback) = 0;
virtual void remove(int fd, bool close_fd = true) = 0;
protected:
// I don't want anyone to manage object lifetime via interface.
IDescriptorSet() {}
~IDescriptorSet() {}
};
/**
* @brief Wrapper for poll()
*/
class DescriptorSet : public IDescriptorSet {
public:
DescriptorSet();
virtual ~DescriptorSet();
NONCOPYABLE(DescriptorSet);
/*
* Add descriptor fd to watched set. Watches for events. Takes ownership of fd (closes it). Will
* synchronously call supported callback when an event occurs on descriptor. If descriptor
* already exists in the set events and callback will be overwritten.
*
* @param fd descriptor to be watched
* @param events events to watch for
* @param callback callback to be called when an event on descriptor occurs
*/
virtual void add(int fd, short events, Callback&& callback);
/*
* Removes give descriptor from watched set and closes it.
*
* @param fd descriptor to be removed and closed
*/
virtual void remove(int fd, bool close_fd = true);
/*
* Wait for descriptor events using poll().
* Synchronously calls provided descriptor callbacks.
*
* @param timeout_ms timeout in ms. egative value means no timeout.
*
* @throws Timeout exception in case of timeout
* @throws InternalError in case of other error
*/
void wait(int timeout_ms = 60000);
/*
* Removes and closes all descriptors
*/
void purge();
DECLARE_EXCEPTION_TYPE(CKM::Exception, InternalError);
DECLARE_EXCEPTION_TYPE(CKM::Exception, Timeout);
protected:
// returns false if there are no descriptors to wait for
bool rebuildPollfd();
void notify(int descCount);
struct DescriptorData {
DescriptorData(short e, Callback&& c) : events(e), callback(std::move(c)) {}
short events;
Callback callback;
};
std::map<int, DescriptorData> m_descriptors;
// true if pollfd needs update
bool m_dirty;
pollfd* m_fds;
};
} /* namespace CKM */
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