Lab 5 - Extending the Museum

In this lab, modify the Museum simulation which is included in the MuseumSimulation.cs found in Chapters 23 and 24 of the Smalltalk-80 textbook. We will modify the Museum to have more people in the museum than just visitors. Add volunteers and staff.

• Volunteers are people who come in for a few hours a day to explain the exhibits to the visitors. They enter the simulation on a normal distribution of every two hours (on average) with a deviation of 30 minutes. They stay for an average of four hours with a deviation of 90 minutes, normally distributed.

• Staff naturally are at the museum all day (eight hours). There are five staff members who arrive first thing in the morning.

Your simulation should keep track of the number of people in the museum at each time interval, where the number of people includes staff, volunteers, and visitors. Have your simulation be able to output the maximum number of people at any time. Hint: Either during the enter: method or on the simulation object's initialize: method, increment a count of people. At exit:, decrement the number of people.

Also, be careful of the syntax used for some of the classes in the Simulation package. For the entry of people, you may use the following methods:

scheduleArrivalOf:at:
scheduleArrivalOf:accordingTo:
scheduleArrivalOf:accordingTo:startingAt:

Make sure you understand how these work and what can and cannot be passed to them. The statistical information should be included in the package, so you don't have to worry about that. Look at how the functions are implemented in the other simulation classes to get an idea of how to do it.

To run the simulation provided, use the code below:

        | aSimulation |
        aSimulation := Museum  new startUp.
        [aSimulation time < 480] whileTrue: [aSimulation proceed]. "480 
minutes, all day"
        Transcript show: 'Maximum: ', (aSimulation maximum printString) ; 
cr. 

Note: If Squeak is stalling on the whileTrue: loop, you can exit it by pressing CTRL-Break simultaneously. The Break key is the right-most key on the top-most keyboard line.