00001 /* 00002 * Copyright (c) Xerox Corporation 1998. All rights reserved. 00003 * 00004 * This program is free software; you can redistribute it and/or modify it 00005 * under the terms of the GNU General Public License as published by the 00006 * Free Software Foundation; either version 2 of the License, or (at your 00007 * option) any later version. 00008 * 00009 * This program is distributed in the hope that it will be useful, but 00010 * WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 * General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU General Public License along 00015 * with this program; if not, write to the Free Software Foundation, Inc., 00016 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00017 * 00018 * Linking this file statically or dynamically with other modules is making 00019 * a combined work based on this file. Thus, the terms and conditions of 00020 * the GNU General Public License cover the whole combination. 00021 * 00022 * In addition, as a special exception, the copyright holders of this file 00023 * give you permission to combine this file with free software programs or 00024 * libraries that are released under the GNU LGPL and with code included in 00025 * the standard release of ns-2 under the Apache 2.0 license or under 00026 * otherwise-compatible licenses with advertising requirements (or modified 00027 * versions of such code, with unchanged license). You may copy and 00028 * distribute such a system following the terms of the GNU GPL for this 00029 * file and the licenses of the other code concerned, provided that you 00030 * include the source code of that other code when and as the GNU GPL 00031 * requires distribution of source code. 00032 * 00033 * Note that people who make modified versions of this file are not 00034 * obligated to grant this special exception for their modified versions; 00035 * it is their choice whether to do so. The GNU General Public License 00036 * gives permission to release a modified version without this exception; 00037 * this exception also makes it possible to release a modified version 00038 * which carries forward this exception. 00039 * 00040 * $Header: /cvsroot/nsnam/ns-2/webcache/tcpapp.h,v 1.15 2005/08/26 05:05:32 tomh Exp $ 00041 */ 00042 00043 // 00044 // TcpApp - Transmitting real application data via TCP 00045 // 00046 // XXX Model a TCP connection as a FIFO byte stream. It shouldn't be used 00047 // if this assumption is violated. 00048 00049 #ifndef ns_tcpapp_h 00050 #define ns_tcpapp_h 00051 00052 #include "ns-process.h" 00053 #include "app.h" 00054 00055 class CBuf { 00056 public: 00057 CBuf(AppData *c, int nbytes); 00058 ~CBuf() { 00059 if (data_ != NULL) 00060 delete data_; 00061 } 00062 AppData* data() { return data_; } 00063 int size() { return size_; } 00064 int bytes() { return nbytes_; } 00065 00066 #ifdef TCPAPP_DEBUG 00067 // debug only 00068 double& time() { return time_; } 00069 #endif 00070 00071 protected: 00072 friend class CBufList; 00073 AppData *data_; 00074 int size_; 00075 int nbytes_; // Total length of this transmission 00076 CBuf *next_; 00077 00078 #ifdef TCPAPP_DEBUG 00079 // for debug only 00080 double time_; 00081 #endif 00082 }; 00083 00084 // A FIFO queue 00085 class CBufList { 00086 public: 00087 #ifdef TCPAPP_DEBUG 00088 CBufList() : head_(NULL), tail_(NULL), num_(0) {} 00089 #else 00090 CBufList() : head_(NULL), tail_(NULL) {} 00091 #endif 00092 ~CBufList(); 00093 00094 void insert(CBuf *cbuf); 00095 CBuf* detach(); 00096 00097 protected: 00098 CBuf *head_; 00099 CBuf *tail_; 00100 #ifdef TCPAPP_DEBUG 00101 int num_; 00102 #endif 00103 }; 00104 00105 00106 class TcpApp : public Application { 00107 public: 00108 TcpApp(Agent *tcp); 00109 ~TcpApp(); 00110 00111 virtual void recv(int nbytes); 00112 virtual void send(int nbytes, AppData *data); 00113 00114 void connect(TcpApp *dst) { dst_ = dst; } 00115 00116 virtual void process_data(int size, AppData* data); 00117 virtual AppData* get_data(int&, AppData*) { 00118 // Not supported 00119 abort(); 00120 return NULL; 00121 } 00122 00123 // Do nothing when a connection is terminated 00124 virtual void resume(); 00125 00126 protected: 00127 virtual int command(int argc, const char*const* argv); 00128 CBuf* rcvr_retrieve_data() { return cbuf_.detach(); } 00129 00130 // We don't have start/stop 00131 virtual void start() { abort(); } 00132 virtual void stop() { abort(); } 00133 00134 TcpApp *dst_; 00135 CBufList cbuf_; 00136 CBuf *curdata_; 00137 int curbytes_; 00138 }; 00139 00140 #endif // ns_tcpapp_h
1.7.1