webtraf.h

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */

/*
 * webtraf.h
 * Copyright (C) 1999 by the University of Southern California
 * $Id: webtraf.h,v 1.18 2005/08/25 18:58:13 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.
 *
 */
//
// Incorporating Polly's web traffic module into the PagePool framework
//
// XXX This has nothing to do with the HttpApp classes. Because we are 
// only interested in traffic pattern here, we do not want to be bothered 
// with the burden of transmitting HTTP headers, etc. 
//
// $Header: /nfs/jade/vint/CVSROOT/ns-2/webcache/webtraf.h,v 1.18 2005/08/25 18:58:13 johnh Exp $

#ifndef ns_webtraf_h
#define ns_webtraf_h

#include "ranvar.h"
#include "random.h"
#include "timer-handler.h"

#include "lib/bsd-list.h"
#include "node.h"
#include "tcp.h"
#include "tcp-sink.h"
#include "pagepool.h"
#include "webserver.h"

const int WEBTRAF_DEFAULT_OBJ_PER_PAGE = 1;

class WebTrafPool;

class WebTrafSession : public TimerHandler {
public: 
    WebTrafSession(WebTrafPool *mgr, Node *src, int np, int id, int ftcp_, int recycle_p);
    virtual ~WebTrafSession();

    // Queried by individual pages/objects
    inline RandomVariable*& interPage() { return rvInterPage_; }
    inline RandomVariable*& pageSize() { return rvPageSize_; }
    inline RandomVariable*& interObj() { return rvInterObj_; }
    inline RandomVariable*& objSize() { return rvObjSize_; }

    void donePage(void* ClntData);
    void launchReq(void* ClntData, int obj, int size);
    inline int id() const { return id_; }
    inline WebTrafPool* mgr() { return mgr_; }
    inline void set_interPageOption(int option) { interPageOption_ = option; }

    static int LASTPAGE_;

private:
    virtual void expire(Event *e = 0);
    virtual void handle(Event *e);

    RandomVariable *rvInterPage_, *rvPageSize_, *rvInterObj_, *rvObjSize_;
    WebTrafPool* mgr_;
    Node* src_;     // One Web client (source of request) per session
    int nPage_, curPage_, donePage_;
    int id_, interPageOption_;
    
    // fulltcp support
    int fulltcp_;
    // Reuse of page level attributes support
    int recycle_page_;
};

class WebServer;
class WebTrafPool : public PagePool {
public: 
    WebTrafPool(); 
    virtual ~WebTrafPool(); 

    Node* picksrc();
    Node* pickdst();
    inline void doneSession(int idx) { 
        assert((idx>=0) && (idx<nSession_) && (session_[idx]!=NULL));
        if (isdebug())
            printf("deleted session %d\n", idx);
        delete session_[idx];
        session_[idx] = NULL; 
    }

    void launchReq(Node*, void*, int, int);
    void launchResp(int, Node*, Node*, Agent*, Agent*, int, void*);
    inline int nTcp() { return nTcp_; }
    inline int nSink() { return nSink_; }
    inline int isdebug() { return debug_; }

    virtual void delay_bind_init_all();
    virtual int delay_bind_dispatch(const char*, const char*, TclObject*);

    // pick end points for a new TCP connection
    void pick_ep(TcpAgent**, Agent**);
    TcpAgent* picktcp();
    TcpSink* picksink();
    // Given sever's node id, find server
    int find_server(int);

protected:
    virtual int command(int argc, const char*const* argv);

    

    // Session management: fixed number of sessions, fixed number
    // of pages per session
    int nSession_;
    WebTrafSession** session_; 

    // Web servers
    int nServer_;
    //Node** server_;
    // keep the finish time of the last job (M/G/1)
    WebServer *server_;

    // Browsers
    int nClient_;
    Node** client_;

    // Debo added this
    int asimflag_;

    // TCP agent pool management
    struct AgentListElem {
        AgentListElem(Agent* a) : agt_(a) {
            link.le_next = NULL;
            link.le_prev = NULL;
        }
        Agent* agt_;
        LIST_ENTRY(AgentListElem) link;
    };
    LIST_HEAD(AgentList, AgentListElem);
    inline void insertAgent(AgentList* l, Agent *a) {
        AgentListElem *e = new AgentListElem(a);
        LIST_INSERT_HEAD(l, e, link);
    }
    inline Agent* detachHead(AgentList* l) {
        AgentListElem *e = l->lh_first;
        if (e == NULL)
            return NULL;
        Agent *a = e->agt_;
        LIST_REMOVE(e, link);
        delete e;
        return a;
    }
    int nTcp_, nSink_;
    int dbTcp_a, dbTcp_r, dbTcp_cr;
    AgentList tcpPool_; /* TCP agent pool */
    AgentList sinkPool_;    /* TCP sink pool */

    // Helper methods
    inline int lookup_rv(RandomVariable*& rv, const char* name) {
        if (rv != NULL)
            Tcl::instance().evalf("delete %s", rv->name());
        rv = (RandomVariable*)lookup_obj(name);
        return rv ? (TCL_OK) : (TCL_ERROR);
    }
    int debug_;
    // fulltcp support
    int fulltcp_;
    // Reuse of page level attributes support
    int recycle_page_;

    int dont_recycle_; // Do not recycle tcp agents
};

#endif // ns_webtraf_h

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