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/*
* webserver.h
* Copyright (C) 1999 by the University of Southern California
* $Id: webserver.h,v 1.6 2011/10/01 22:00:14 tom_henderson 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.
*
*/
//
// Incorporation Polly's web traffic module into the PagePool framework
//
// Simple web server implementation
// Two server scheduling policies supported: fcfs and stf
// Xuan Chen (xuanc@isi.edu)
//
#ifndef ns_webserver_h
#define ns_webserver_h
#include "webtraf.h"
#define NO_DELAY 0
#define FCFS_DELAY 1
#define STF_DELAY 2
// Data structure for incoming jobs (requests)
struct job_s {
int obj_id;
Node *clnt;
Agent *tcp;
Agent *snk;
int size;
int pid;
job_s *next;
};
class WebTrafPool;
// Data structure for web server
class WebServer : public TimerHandler{
private:
void WebServer_init(WebTrafPool *);
public:
WebServer(WebTrafPool*pool_) { WebServer_init(pool_); };
WebServer() { WebServer_init(NULL); };
// Assign node to server
void set_node(Node *);
// Return server's node
Node* get_node();
// Return server's node id
int get_nid();
// Set server processing rate
void set_rate(double);
// Set server function mode
void set_mode(int);
// Set the limit for job queue
void set_queue_limit(int);
// Handling incoming job
double job_arrival(int, Node *, Agent *, Agent *, int, int);
private:
// The web page pool associated with this server
WebTrafPool *web_pool_;
// The node associated with this server
Node *node;
// Server processing rate KB/s
double rate_;
// Flag for web server:
// 0: there's no server processing delay
// 1: server processing delay from FCFS scheduling policy
// 2: server processing delay from STF scheduling policy
int mode_;
// Job queue
job_s *head, *tail;
int queue_size_;
int queue_limit_;
virtual void expire(Event *e);
double job_departure();
// Flag for server status
int busy_;
void schedule_next_job();
};
#endif //ns_webserver_h
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