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     //#if FILE_METHODS
00049     FILE *d_file;  // Sink for the Error object.
00050     //#endif
00051     ostream &d_stream;
00052     string d_version;
00053 
00054     // Ensure that d_stream gets initialized...
00055     AlarmHandler() :
00056         //#if FILE_METHODS
00057         d_file( 0 ),
00058         //#endif
00059         d_stream( cout )
00060     {}
00061 
00062 public:
00065     //#if FILE_METHODS
00066     AlarmHandler(FILE *s) : d_file(s), d_stream( cout )
00067     {}
00068     //#endif
00069     AlarmHandler(ostream &out) :
00070         //#if FILE_METHODS
00071         d_file(0),
00072         //#endif
00073         d_stream( out )
00074     {}
00075 
00076     virtual ~AlarmHandler()
00077     {
00078         //#if FILE_METHODS
00079         if( d_file )
00080             fclose( d_file ) ;
00081         //#endif
00082     }
00083 
00096     virtual void handle_signal(int signum)
00097     {
00098         if (signum != SIGALRM)
00099             fprintf(stderr, "SIGALRM handler caught another signal!\n");
00100 #if 0
00101         // Use this code, or a variant, once we have reliable error delivery.
00102         if( d_file )
00103             fprintf(d_file, "\n\n\n\n");
00104         else
00105             d_stream << "\n\n\n\n";
00106 
00107         Error e("The server has timed out. This happens when a request\n\
00108                 takes longer to process than the server's preset time-out value.\n\
00109                 Try making a request for a smaller amount of data. You can also contact\n\
00110                 the server's administrator and request that the time-out value be increased.");
00111 
00112         if( d_file )
00113             e.print(d_file);
00114         else
00115             e.print(d_stream);
00116 #endif
00117         exit(1);
00118     }
00119 
00120 };
00121 
00122 } // namespace libdap
00123 
00124 #endif

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