Appendix

introduction model software example hypermedia conclusions references appendix

Alternative 1:

First, the client, of class agent is created together with a histogram to collect information about the lifetime of the generated objects. It will generate objects (requests) because generate has been specified in the script. The client will will generate requests (of class data) according to a poisson distribution with means 60, as has been set by the -duration switch. 

  
   histogram agenthist                    #create histogram	
   agent client generate emphist          #create agent called ``client''
   client -duration 60 1 poisson          #specify duration
The first datahandler to receive data from the client is the transport, t1. Again, the duration is set by the switch -duration 

  
   transport t1                           #create transport called ``t1''
   t1 -duration 20                        #specify duraion
The second datahandler to receive data from the client is the waitqueue, wq1. The two histograms collect information about the length of the queue and the waiting times. The waitqueue holds the data that it receives until the first operation, receive, is ready to process it. Whether operation receive is ready depends on the availability of an employee to execute the operation. When {\em receive} finishes it will pass its data on to choice choosepath. 

   histogram wq1ahist                     #create histograms
   histogram wq1bhist 
   queue wq1 wq1ahist wq1bhist            #create queue called ``wq1''
   
  
   histogram clerkhist 
   employee clerk clerkhist 3             #create employee called ``clerk'' with 	                                       #capacity 3
  
   operation receive clerk                #create operation called ``receive'' 
                                          #which requires the employee ``clerk''
   receive -duration 20.0 1 poisson       #specify duration
The choice is created with the values 2 and 3 representing the chance that the loan will be less than 1000 dollars. 

  
   choice choosepath 2 3                  #create choice called ``choosepath''
   choosepath -duration 10 1 poisson      #specify duration
  
   histogram wq2ahist wid	                #create histograms for second queue
   histogram wq2bhist wid
   queue  wq2 wq2ahist  wq2bhist          #create ``wq2''
  
  
   histogram wq3ahist wid	                #create histograms for third queue
   histogram wq3bhist wid
   queue  wq3 wq3ahist  wq3bhist          #create ``wq3''
  
   histogram bosshist wid	                #create histograms for emp ``boss''
   employee boss bosshist 1               #create ``boss'', capacity 1
  
   operation largeloan boss               #create operation ``largeloan''
                                          #which requires employee ``boss''
   large_loan -duration 20.0              #specify duration
  
   operation smallloan clerk              #create operation ``largeloan''
                                          #which requires employee ``boss''
   small_loan -duration 20.0              #specify duration
  
   transport t2                           #create transport ``t2''
   t2 -duration 20 1 poisson              #specify duration
  
  
   transport t3                           #create transport ``t3''
   t3 -duration 20 1 poisson              #specify duration
  
  
   histogram wq4ahist wid	                #create histograms for forth  queue
   histogram wq4bhist wid
   queue wq4 wq4ahist wq4b_hist           #create ``wq3''
  
   operation finalise  clerk              #create operation ``finalise''
                                          #which requires employee ``clerk''
   finalise -duration 20.0                #specify duration
  
   transport t4                           #create transport ``t2''
   t4 -duration 20                        #specify duration
Now, the process structure can be specified by means of the -next switch. 

  
  
   client -next t1
   t1 -next wq1
   wq1 -next receive
   receive -next choosepath
   choosepath -next  wq1 wq2
   wq1 -next largeloan
   wq2 -next smallloan
   largeloan -next wq3
   smallloan -next wq3
   wq3 -next finalise
   finalise -next t4
   t4 -next client
The simulation is then run for 10000 generated data objects and the results are displayed by the histogram widgets. 

  
  sim run 10000

Alternative 2:


   histogram agenthist wid
   agent client generate emphist
   client -duration 60 1 poisson
  
   transport t1
   t1 -duration 20
  
   histogram wq1ahist wid
   histogram wq1bhist wid
   queue wq1 wq1ahist wq1bhist 
  
   histogram clerkhist wid
   employee clerk clerkhist 3
  
   operation receive clerk
   receive -duration 20.0 1 poisson
  
  
   means computer 3
  
   transport t2
   t2 -duration 20
  
   histogram wq2ahist wid
   histogram wq2bhist wid
   queue  wq2 wq2ahist wq2bhist
  
   histogram clerk2hist wid
   employee clerk2 clerk2hist 1
  
   operation approve clerk2
   approve -duration 20.0 1 poisson
  
   transport t3
   t3 -duration 20
  
  
   client -next t1
   t1 -next wq1
   wq1 -next receive
   receive -next t2
   t2 -next wq2
   wq2 -next approve
   approve -next t3
   t3 -next client

Some results

After we run the program, we get the following results.
introduction model software example hypermedia conclusions references appendix