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/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* ns-process.h
* Copyright (C) 1997 by the University of Southern California
* $Id: ns-process.h,v 1.6 2005/08/25 18:58:02 johnh Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*
* The copyright of this module includes the following
* linking-with-specific-other-licenses addition:
*
* In addition, as a special exception, the copyright holders of
* this module give you permission to combine (via static or
* dynamic linking) this module 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 module 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 module
* 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.
*
*/
// ADU and ADU processor
//
// $Header: /cvsroot/nsnam/ns-2/common/ns-process.h,v 1.6 2005/08/25 18:58:02 johnh Exp $
#ifndef ns_process_h
#define ns_process_h
#include <assert.h>
#include <string.h>
#include "config.h"
// Application-level data unit types
enum AppDataType {
// Illegal type
ADU_ILLEGAL,
// Old packet data ADU
PACKET_DATA,
// HTTP ADUs
HTTP_DATA,
HTTP_INVALIDATION, // Heartbeat that may contain invalidation
HTTP_UPDATE, // Pushed page updates (version 1)
HTTP_PROFORMA, // Pro forma sent when a direct request is sent
HTTP_JOIN,
HTTP_LEAVE,
HTTP_PUSH, // Selectively pushed pages
HTTP_NORMAL, // Normal req/resp packets
// TcpApp ADU
TCPAPP_STRING,
// Multimedia ADU
MEDIA_DATA,
MEDIA_REQUEST,
// pub/sub ADU
PUBSUB,
//Diffusion ADU
DIFFUSION_DATA,
// Last ADU
ADU_LAST
};
// Interface for generic application-level data unit. It should know its
// size and how to make itself persistent.
class AppData {
private:
AppDataType type_; // ADU type
public:
AppData(AppDataType type) { type_ = type; }
AppData(AppData& d) { type_ = d.type_; }
virtual ~AppData() {}
AppDataType type() const { return type_; }
// The following two methods MUST be rewrited for EVERY derived classes
virtual int size() const { return sizeof(AppData); }
virtual AppData* copy() = 0;
};
// Models any entity that is capable of process an ADU.
// The basic functionality of this entity is to (1) process data,
// (2) pass data to another entity, (3) request data from another entity.
class Process : public TclObject {
public:
Process() : target_(0) {}
inline Process*& target() { return target_; }
// Process incoming data
virtual void process_data(int size, AppData* data);
// Request data from the previous application in the chain
virtual AppData* get_data(int& size, AppData* req_data = 0);
// Send data to the next application in the chain
virtual void send_data(int size, AppData* data = 0) {
if (target_)
target_->process_data(size, data);
}
protected:
virtual int command(int argc, const char*const* argv);
Process* target_;
};
#endif // ns_process_h
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