OPeNDAP Hyrax Back End Server (BES) Updated for version 3.8.3
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00001 // BESCache.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 BESCache_h_ 00034 #define BESCache_h_ 1 00035 00036 #include <string> 00037 00038 using std::string ; 00039 00040 #include "BESObj.h" 00041 00042 class BESKeys ; 00043 00044 #define MAX_LOCK_RETRY_MS 5000 // in microseconds 00045 #define MAX_LOCK_TRIES 16 00046 00057 class BESCache : public BESObj 00058 { 00059 private: 00060 string _cache_dir ; 00061 string _prefix ; 00062 unsigned int _cache_size ; 00063 int _lock_fd ; 00064 00065 void check_ctor_params(); 00066 BESCache() {} 00067 public: 00068 BESCache( const string &cache_dir, 00069 const string &prefix, 00070 unsigned int size ) ; 00071 BESCache( BESKeys &keys, 00072 const string &cache_dir_key, 00073 const string &prefix_key, 00074 const string &size_key ) ; 00075 virtual ~BESCache() {} 00076 00077 virtual bool lock( unsigned int retry_ms, 00078 unsigned int num_tries ) ; 00079 virtual bool unlock() ; 00080 00081 virtual bool is_cached( const string &src, string &target ) ; 00082 virtual void purge( ) ; 00083 00084 string cache_dir( ) { return _cache_dir ; } 00085 string prefix( ) { return _prefix ; } 00086 unsigned int cache_size( ) { return _cache_size ; } 00087 00088 virtual void dump( ostream &strm ) const ; 00089 }; 00090 00091 #endif // BESCache_h_ 00092