AlarmHandler.h

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00001 
00002 // -*- mode: c++; c-basic-offset:4 -*-
00003 
00004 // This file is part of libdap, A C++ implementation of the OPeNDAP Data
00005 // Access Protocol.
00006 
00007 // Copyright (c) 2002,2003 OPeNDAP, Inc.
00008 // Author: James Gallagher <jgallagher@opendap.org>
00009 //
00010 // This library is free software; you can redistribute it and/or
00011 // modify it under the terms of the GNU Lesser General Public
00012 // License as published by the Free Software Foundation; either
00013 // version 2.1 of the License, or (at your option) any later version.
00014 //
00015 // This library is distributed in the hope that it will be useful,
00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00023 //
00024 // You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
00025 
00026 #ifndef alarm_handler_h
00027 #define alarm_handler_h
00028 
00029 #include <cstdio>
00030 
00031 #include <string>
00032 
00033 #include "EventHandler.h"
00034 
00035 namespace libdap
00036 {
00037 
00045 class AlarmHandler : public EventHandler
00046 {
00047 private:
00048     FILE *d_file;  // Sink for the Error object.
00049     ostream &d_stream;
00050     string d_version;
00051 
00052     // Ensure that d_stream gets initialized...
00053     AlarmHandler() : d_file( 0 ), d_stream( cout )
00054     {}
00055 
00056 public:
00059     AlarmHandler(FILE *s) : d_file(s), d_stream( cout )
00060     {}
00061 
00062     AlarmHandler(ostream &out) : d_file(0), d_stream( out )
00063     {}
00064 
00065     virtual ~AlarmHandler()
00066     {
00067         if( d_file )
00068                 fclose( d_file ) ;
00069     }
00070 
00083     virtual void handle_signal(int signum)
00084     {
00085         if (signum != SIGALRM)
00086             fprintf(stderr, "SIGALRM handler caught another signal!\n");
00087 #if 0
00088         // Use this code, or a variant, once we have reliable error delivery.
00089         if( d_file )
00090             fprintf(d_file, "\n\n\n\n");
00091         else
00092             d_stream << "\n\n\n\n";
00093 
00094         Error e("The server has timed out. This happens when a request\n\
00095                 takes longer to process than the server's preset time-out value.\n\
00096                 Try making a request for a smaller amount of data. You can also contact\n\
00097                 the server's administrator and request that the time-out value be increased.");
00098 
00099         if( d_file )
00100             e.print(d_file);
00101         else
00102             e.print(d_stream);
00103 #endif
00104         exit(1);
00105     }
00106 
00107 };
00108 
00109 } // namespace libdap
00110 
00111 #endif

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