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/*
* Copyright (c) Xerox Corporation 1998. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linking this file statically or dynamically with other modules is making
* a combined work based on this file. Thus, the terms and conditions of
* the GNU General Public License cover the whole combination.
*
* In addition, as a special exception, the copyright holders of this file
* give you permission to combine this file with free software programs or
* libraries that are released under the GNU LGPL and with code included in
* the standard release of ns-2 under the Apache 2.0 license or under
* otherwise-compatible licenses with advertising requirements (or modified
* versions of such code, with unchanged license). You may copy and
* distribute such a system following the terms of the GNU GPL for this
* file and the licenses of the other code concerned, provided that you
* include the source code of that other code when and as the GNU GPL
* requires distribution of source code.
*
* Note that people who make modified versions of this file are not
* obligated to grant this special exception for their modified versions;
* it is their choice whether to do so. The GNU General Public License
* gives permission to release a modified version without this exception;
* this exception also makes it possible to release a modified version
* which carries forward this exception.
*
* $Header: /cvsroot/nsnam/ns-2/webcache/tcpapp.h,v 1.15 2005/08/26 05:05:32 tomh Exp $
*/
//
// TcpApp - Transmitting real application data via TCP
//
// XXX Model a TCP connection as a FIFO byte stream. It shouldn't be used
// if this assumption is violated.
#ifndef ns_tcpapp_h
#define ns_tcpapp_h
#include "ns-process.h"
#include "app.h"
class CBuf {
public:
CBuf(AppData *c, int nbytes);
~CBuf() {
if (data_ != NULL)
delete data_;
}
AppData* data() { return data_; }
int size() { return size_; }
int bytes() { return nbytes_; }
#ifdef TCPAPP_DEBUG
// debug only
double& time() { return time_; }
#endif
protected:
friend class CBufList;
AppData *data_;
int size_;
int nbytes_; // Total length of this transmission
CBuf *next_;
#ifdef TCPAPP_DEBUG
// for debug only
double time_;
#endif
};
// A FIFO queue
class CBufList {
public:
#ifdef TCPAPP_DEBUG
CBufList() : head_(NULL), tail_(NULL), num_(0) {}
#else
CBufList() : head_(NULL), tail_(NULL) {}
#endif
~CBufList();
void insert(CBuf *cbuf);
CBuf* detach();
protected:
CBuf *head_;
CBuf *tail_;
#ifdef TCPAPP_DEBUG
int num_;
#endif
};
class TcpApp : public Application {
public:
TcpApp(Agent *tcp);
~TcpApp();
virtual void recv(int nbytes);
virtual void send(int nbytes, AppData *data);
void connect(TcpApp *dst) { dst_ = dst; }
virtual void process_data(int size, AppData* data);
virtual AppData* get_data(int&, AppData*) {
// Not supported
abort();
return NULL;
}
// Do nothing when a connection is terminated
virtual void resume();
protected:
virtual int command(int argc, const char*const* argv);
CBuf* rcvr_retrieve_data() { return cbuf_.detach(); }
// We don't have start/stop
virtual void start() { abort(); }
virtual void stop() { abort(); }
TcpApp *dst_;
CBufList cbuf_;
CBuf *curdata_;
int curbytes_;
};
#endif // ns_tcpapp_h
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