00001 00002 /* 00003 * webserver.h 00004 * Copyright (C) 1999 by the University of Southern California 00005 * $Id: webserver.h,v 1.5 2005/08/25 18:58:13 johnh Exp $ 00006 * 00007 * This program is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU General Public License, 00009 * version 2, as published by the Free Software Foundation. 00010 * 00011 * This program is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 * GNU General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU General Public License along 00017 * with this program; if not, write to the Free Software Foundation, Inc., 00018 * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. 00019 * 00020 * 00021 * The copyright of this module includes the following 00022 * linking-with-specific-other-licenses addition: 00023 * 00024 * In addition, as a special exception, the copyright holders of 00025 * this module give you permission to combine (via static or 00026 * dynamic linking) this module with free software programs or 00027 * libraries that are released under the GNU LGPL and with code 00028 * included in the standard release of ns-2 under the Apache 2.0 00029 * license or under otherwise-compatible licenses with advertising 00030 * requirements (or modified versions of such code, with unchanged 00031 * license). You may copy and distribute such a system following the 00032 * terms of the GNU GPL for this module and the licenses of the 00033 * other code concerned, provided that you include the source code of 00034 * that other code when and as the GNU GPL requires distribution of 00035 * source code. 00036 * 00037 * Note that people who make modified versions of this module 00038 * are not obligated to grant this special exception for their 00039 * modified versions; it is their choice whether to do so. The GNU 00040 * General Public License gives permission to release a modified 00041 * version without this exception; this exception also makes it 00042 * possible to release a modified version which carries forward this 00043 * exception. 00044 * 00045 */ 00046 00047 // 00048 // Incorporation Polly's web traffic module into the PagePool framework 00049 // 00050 // Simple web server implementation 00051 // Two server scheduling policies supported: fcfs and stf 00052 // Xuan Chen (xuanc@isi.edu) 00053 // 00054 00055 #ifndef ns_webserver_h 00056 #define ns_webserver_h 00057 00058 #include "webtraf.h" 00059 00060 #define NO_DELAY 0 00061 #define FCFS_DELAY 1 00062 #define STF_DELAY 2 00063 00064 // Data structure for incoming jobs (requests) 00065 struct job_s { 00066 int obj_id; 00067 Node *clnt; 00068 Agent *tcp; 00069 Agent *snk; 00070 int size; 00071 void *data; 00072 job_s *next; 00073 }; 00074 00075 class WebTrafPool; 00076 00077 // Data structure for web server 00078 class WebServer : public TimerHandler{ 00079 private: 00080 void WebServer_init(WebTrafPool *); 00081 00082 public: 00083 WebServer(WebTrafPool*pool_) { WebServer_init(pool_); }; 00084 WebServer() { WebServer_init(NULL); }; 00085 00086 // Assign node to server 00087 void set_node(Node *); 00088 // Return server's node 00089 Node* get_node(); 00090 // Return server's node id 00091 int get_nid(); 00092 00093 // Set server processing rate 00094 void set_rate(double); 00095 // Set server function mode 00096 void set_mode(int); 00097 // Set the limit for job queue 00098 void set_queue_limit(int); 00099 00100 // Handling incoming job 00101 double job_arrival(int, Node *, Agent *, Agent *, int, void *); 00102 00103 private: 00104 // The web page pool associated with this server 00105 WebTrafPool *web_pool_; 00106 00107 // The node associated with this server 00108 Node *node; 00109 00110 // Server processing rate KB/s 00111 double rate_; 00112 00113 // Flag for web server: 00114 // 0: there's no server processing delay 00115 // 1: server processing delay from FCFS scheduling policy 00116 // 2: server processing delay from STF scheduling policy 00117 int mode_; 00118 00119 // Job queue 00120 job_s *head, *tail; 00121 int queue_size_; 00122 int queue_limit_; 00123 00124 virtual void expire(Event *e); 00125 00126 double job_departure(); 00127 00128 // Flag for server status 00129 int busy_; 00130 void schedule_next_job(); 00131 }; 00132 #endif //ns_webserver_h