io_service_signal.h

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// Copyright (C) 2014-2017 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef IO_SERVICE_SIGNAL_H
#define IO_SERVICE_SIGNAL_H

#include <asiolink/io_service.h>
#include <asiolink/interval_timer.h>
#include <exceptions/exceptions.h>

#include <map>
#include <stdint.h>

namespace isc {
namespace process {

class IOSignalError : public isc::Exception {
public:
    IOSignalError(const char* file, size_t line, const char* what) :
        isc::Exception(file, line, what) { };
};

typedef uint64_t IOSignalId;

typedef boost::function<void(IOSignalId sequence_id)> IOSignalHandler;

class IOSignal {
public:
    IOSignal(asiolink::IOService& io_service, int signum,
              IOSignalHandler handler);

    ~IOSignal();

    static IOSignalId nextSequenceId() {
        static IOSignalId next_id_ = 0;
        return (++next_id_);
    }

    IOSignalId getSequenceId() const {
        return (sequence_id_);
    }

    int getSignum() const {
        return (signum_);
    }

    class TimerCallback : public std::unary_function<void, void> {
    public:
        TimerCallback(IOSignalId sequence_id, IOSignalHandler handler);

        void operator()();

    private:
        IOSignalId sequence_id_;

        IOSignalHandler handler_;
    };

private:
    IOSignalId sequence_id_;

    int signum_;

    asiolink::IntervalTimerPtr timer_;
};

typedef boost::shared_ptr<IOSignal> IOSignalPtr;

typedef std::map<IOSignalId, IOSignalPtr> IOSignalMap;

class IOSignalQueue {
public:
    IOSignalQueue (asiolink::IOServicePtr& io_service);

    ~IOSignalQueue();

    IOSignalId pushSignal(int signum, IOSignalHandler handler);

    IOSignalPtr popSignal(IOSignalId sequence_id);

    void clear();

private:
    asiolink::IOServicePtr io_service_;

    IOSignalMap signals_;
};

typedef boost::shared_ptr<IOSignalQueue> IOSignalQueuePtr;


}; // end of isc::process namespace
}; // end of isc namespace

#endif // IO_SERVICE_SIGNAL_H