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/*
* Copyright (c) 2003 International Computer Science Institute
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by ICIR, the ICSI
* Center for Internet Research (ICSI: the International Computer
* Science Institute).
* 4. Neither the name of ICIR nor of ICSI may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ICSI AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL ICSI OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include "connector.h"
#include "random.h"
#include "timer-handler.h"
#include "ranvar.h"
class Delayer;
/* handler for Delayer's target (link) */
class TargetHandler : public Handler {
public:
inline TargetHandler(Delayer& d) : delayer_(d) {}
inline void handle(Event*);
private:
Delayer& delayer_;
};
/* timer for channel allocation delay */
class AllocTimer : public TimerHandler {
public:
inline AllocTimer(Delayer& d) : delayer_(d) {}
inline void expire(Event*);
private:
Delayer& delayer_;
};
/* timer for delay spikes */
class SpikeTimer : public TimerHandler {
public:
inline SpikeTimer(Delayer& d) : delayer_(d) {}
inline void expire(Event*);
private:
Delayer& delayer_;
};
class Delayer : public Connector {
public:
Delayer();
int command(int argc, const char*const* argv);
void recv(Packet* p, Handler* h);
void try_send();
inline void freeTarget() {target_free = 1;}
inline void freeAlloc() {alloc_free = 1;}
inline void freeSpike() {spike_free = 1;}
inline void takeSpike() {spike_free = 0;}
int getSpike() {return spike_free;}
double getNextSpikeLen () {return spike_len->value(); }
double getNextSpikeInt () {return spike_int->value(); }
private:
double last_sent; /* time a packet has last left the queue */
RandomVariable *alloc_int; /* time of keeping channel without data */
RandomVariable *alloc_len; /* delay to allocate a new channel */
int alloc_free; /* are we in channel allocation delay? */
AllocTimer at_;
RandomVariable *spike_int; /* interval between delay spikes */
RandomVariable *spike_len; /* delay spike length */
int spike_free; /* are we in a delay spike? */
SpikeTimer st_;
int target_free; /* is the link free? */
TargetHandler th_;
Handler *prev_h_; /* downstream handler */
Packet *pkt_; /* packet we store */
Event e; /* something to give to prev_h_ */
};
static class DelayerClass : public TclClass {
public:
DelayerClass() : TclClass("Delayer") {}
TclObject* create(int, const char*const*) {
return (new Delayer());
}
} delayer_class;
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