PPTConnection.h

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00001 // PPTConnection.h
00002 
00003 // This file is part of bes, A C++ back-end server implementation framework
00004 // for the OPeNDAP Data Access Protocol.
00005 
00006 // Copyright (c) 2004-2009 University Corporation for Atmospheric Research
00007 // Author: Patrick West <pwest@ucar.edu> and Jose Garcia <jgarcia@ucar.edu>
00008 //
00009 // This library is free software; you can redistribute it and/or
00010 // modify it under the terms of the GNU Lesser General Public
00011 // License as published by the Free Software Foundation; either
00012 // version 2.1 of the License, or (at your option) any later version.
00013 // 
00014 // This library is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017 // Lesser General Public License for more details.
00018 // 
00019 // You should have received a copy of the GNU Lesser General Public
00020 // License along with this library; if not, write to the Free Software
00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 //
00023 // You can contact University Corporation for Atmospheric Research at
00024 // 3080 Center Green Drive, Boulder, CO 80301
00025  
00026 // (c) COPYRIGHT University Corporation for Atmospheric Research 2004-2005
00027 // Please read the full copyright statement in the file COPYRIGHT_UCAR.
00028 //
00029 // Authors:
00030 //      pwest       Patrick West <pwest@ucar.edu>
00031 //      jgarcia     Jose Garcia <jgarcia@ucar.edu>
00032 
00033 #ifndef PPTConnection_h
00034 #define PPTConnection_h 1
00035 
00036 #include "Connection.h"
00037 #include "PPTProtocol.h"
00038 
00039 class Socket ;
00040 
00041 #define PPT_CHUNK_HEADER_SPACE 15
00042 
00043 class PPTConnection : public Connection
00044 {
00045 private:
00046     int                         _timeout ;
00047     char *                      _inBuff ;
00048     unsigned int                _inBuff_len ;
00049     unsigned int                _bytesRead ;
00050 
00051                                 PPTConnection()
00052                                     : _timeout( 0 ),
00053                                       _inBuff( 0 ),
00054                                       _inBuff_len( 0 ),
00055                                       _bytesRead( 0 ) {}
00056 
00057     virtual int                 readBuffer( char *inBuff,
00058                                             unsigned int buff_size ) ;
00059     virtual int                 readChunkHeader( char *inBuff,
00060                                                  unsigned int buff_size ) ;
00061     virtual void                sendChunk( const string &buffer,
00062                                            map<string,string> &extensions ) ;
00063     virtual void                receive( ostream &strm,
00064                                          unsigned int len ) ;
00065 
00066 protected:
00067                                 PPTConnection( int timeout )
00068                                     : _timeout( timeout ),
00069                                       _inBuff( 0 ),
00070                                       _inBuff_len( 0 ),
00071                                       _bytesRead( 0 ) {}
00072 
00073     virtual int                 readBufferNonBlocking( char *inBuff,
00074                                                        unsigned int buff_size );
00075 
00076     virtual void                send( const string &buffer ) ;
00077     virtual void                read_extensions( map<string,string> &extensions,
00078                                                  const string &xstr ) ;
00079 public:
00080     virtual                     ~PPTConnection() ;
00081 
00082     virtual void                initConnection() = 0 ;
00083     virtual void                closeConnection() = 0 ;
00084 
00085     virtual string              exit() { return PPTProtocol::PPT_EXIT_NOW ; }
00086 
00087     virtual void                send( const string &buffer,
00088                                       map<string,string> &extensions ) ;
00089     virtual void                sendExtensions( map<string,string> &extensions ) ;
00090     virtual void                sendExit() ;
00091     virtual bool                receive( map<string,string> &extensions,
00092                                          ostream *strm = 0 ) ;
00093 
00094     virtual unsigned int        getRecvChunkSize() ;
00095     virtual unsigned int        getSendChunkSize() ;
00096 
00097     virtual void                dump( ostream &strm ) const ;
00098 } ;
00099 
00100 #endif // PPTConnection_h
00101 

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