AlarmHandler.h

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// -*- 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.

#ifndef alarm_handler_h
#define alarm_handler_h

#include <cstdio>

#include <string>

#include "EventHandler.h"

namespace libdap
{

class AlarmHandler : public EventHandler
{
private:
    //#if FILE_METHODS
    FILE *d_file;  // Sink for the Error object.
    //#endif
    ostream &d_stream;
    string d_version;

    // Ensure that d_stream gets initialized...
    AlarmHandler() :
        //#if FILE_METHODS
        d_file( 0 ),
        //#endif
        d_stream( cout )
    {}

public:
    //#if FILE_METHODS
    AlarmHandler(FILE *s) : d_file(s), d_stream( cout )
    {}
    //#endif
    AlarmHandler(ostream &out) :
        //#if FILE_METHODS
        d_file(0),
        //#endif
        d_stream( out )
    {}

    virtual ~AlarmHandler()
    {
        //#if FILE_METHODS
        if( d_file )
            fclose( d_file ) ;
        //#endif
    }

    virtual void handle_signal(int signum)
    {
        if (signum != SIGALRM)
            fprintf(stderr, "SIGALRM handler caught another signal!\n");
#if 0
        // Use this code, or a variant, once we have reliable error delivery.
        if( d_file )
            fprintf(d_file, "\n\n\n\n");
        else
            d_stream << "\n\n\n\n";

        Error e("The server has timed out. This happens when a request\n\
                takes longer to process than the server's preset time-out value.\n\
                Try making a request for a smaller amount of data. You can also contact\n\
                the server's administrator and request that the time-out value be increased.");

        if( d_file )
            e.print(d_file);
        else
            e.print(d_stream);
#endif
        exit(1);
    }

};

} // namespace libdap

#endif

---