1 2 // -*- mode: c++; c-basic-offset:4 -*- 3 4 // This file is part of libdap, A C++ implementation of the OPeNDAP Data 5 // Access Protocol. 6 7 // Copyright (c) 2002,2003 OPeNDAP, Inc. 8 // Author: James Gallagher <jgallagher@opendap.org> 9 // 10 // This library is free software; you can redistribute it and/or 11 // modify it under the terms of the GNU Lesser General Public 12 // License as published by the Free Software Foundation; either 13 // version 2.1 of the License, or (at your option) any later version. 14 // 15 // This library is distributed in the hope that it will be useful, 16 // but WITHOUT ANY WARRANTY; without even the implied warranty of 17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 // Lesser General Public License for more details. 19 // 20 // You should have received a copy of the GNU Lesser General Public 21 // License along with this library; if not, write to the Free Software 22 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 23 // 24 // You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112. 25 26 #ifndef cache_http_response_h 27 #define cache_http_response_h 28 29 #include <cstdio> 30 31 #ifndef response_h 32 #include "Response.h" 33 #endif 34 35 #ifndef _debug_h 36 #include "debug.h" 37 #endif 38 39 namespace libdap 40 { 41 42 /** Encapsulate a response. Instead of directly returning the FILE pointer 43 from which a response is read, return an instance of this object. */ 44 class HTTPCacheResponse : public HTTPResponse 45 { 46 private: 47 HTTPCache *d_cache; // pointer to singleton instance 48 49 protected: 50 /** @name Suppressed default methods */ 51 //@{ 52 HTTPCacheResponse(); 53 HTTPCacheResponse(const HTTPCacheResponse &rs); 54 HTTPCacheResponse &operator=(const HTTPCacheResponse &); 55 //@} 56 57 public: 58 /** Build a Response object. Instances of this class are used to 59 represent responses from a local HTTP/1.1 cache. The stream and 60 headers pointer are passed to the parent (HTTPResponse); there's no 61 temporary file for the parent to manage since the body is read from a 62 file managed by the cache subsystem. This class releases the lock on 63 the cache entry when the destructor is called. */ HTTPCacheResponse(FILE * s,int status_code,vector<string> * headers,HTTPCache * c)64 HTTPCacheResponse(FILE *s, int status_code, vector<string> *headers, HTTPCache *c) 65 : HTTPResponse(s, status_code, headers, ""), d_cache(c) 66 {} 67 68 /** Build a Response object. Instances of this class are used to 69 represent responses from a local HTTP/1.1 cache. The stream and 70 headers pointer are passed to the parent (HTTPResponse); there's no 71 temporary file for the parent to manage since the body is read from a 72 file managed by the cache subsystem. This class releases the lock on 73 the cache entry when the destructor is called. */ HTTPCacheResponse(FILE * s,int status_code,vector<string> * headers,const string & file_name,HTTPCache * c)74 HTTPCacheResponse(FILE *s, int status_code, vector<string> *headers, 75 const string &file_name, HTTPCache *c) 76 : HTTPResponse(s, status_code, headers, file_name), d_cache(c) 77 {} 78 79 /** Free the cache entry lock. Call the parent's destructor. */ ~HTTPCacheResponse()80 virtual ~HTTPCacheResponse() 81 { 82 DBG(cerr << "Freeing HTTPCache resources... "); 83 set_file(""); // This keeps ~HTTPResponse() from removing the cache entry. 84 d_cache->release_cached_response(get_stream()); 85 DBGN(cerr << endl); 86 } 87 }; 88 89 } // namespace libdap 90 91 #endif // cache_http_response_h 92