// -*- mode: c++; c-basic-offset:4 -*-

// This file is part of libdap, A C++ implementation of the OPeNDAP Data

// Access Protocol.

// Copyright (c) 2002,2003 OPeNDAP, Inc.

// Author: James Gallagher <jgallagher@opendap.org>

//

// This library is free software; you can redistribute it and/or

// modify it under the terms of the GNU Lesser General Public

// License as published by the Free Software Foundation; either

// version 2.1 of the License, or (at your option) any later version.

//

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

// Lesser General Public License for more details.

//

// You should have received a copy of the GNU Lesser General Public

// License along with this library; if not, write to the Free Software

// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

//

// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.

#ifndef event_handler_h

#define event_handler_h

#include <iostream>

namespace libdap

{

/** An abstract class which provides a hook method used by SignalHandler.

    Based on "Applying Design Patterns to Simplify Signal Handling", Douglas

    C. Schmidt, 1998, http://www.cs.wustl.edu/~schmidt/signal-patterns.html.

    @see SignalHandler

    @see AlarmHandler

    @author James Gallagher <jgallagher@opendap.org> */

class EventHandler

{

public:

    /** Hook method for SignalHandler. If a concrete instance of this class

    is registered with SignalHandler, this method will be called when \c

    signum is received. */

    virtual void handle_signal(int signum) = 0;

    /** We don't need a destructor, but including one might stave off an

    error later on... */

    virtual ~EventHandler()

    {}

};

#if 0

// moved to SignalHandlerTest jhrg 4/26/13

/** Test Handler. This is used with the SignalHandlerTest unit tests. */

class TestHandler : public EventHandler

{

public:

    int flag;

    TestHandler() : flag(0)

    {}

    virtual void handle_signal(int ) {

        flag = 1;

    }

};

#endif

} // namespace libdap

#endif // event_handler_h