Class BobBank

java.lang.Object
  BobBank

public class BobBank
extends Object

This class shows how to synchronice a bunch of people who take money out of the same bank account. Each person is called Bob[i].

• The bankTeller semaphore is used to make sure that only one person has access to the shared account.
• The reduce semaphore is used to add up all the money taken by each Bob[i] to check that exactly the money that was initially in the bank is the amount that was taken out by each Bob[i].
• Semaphore reduce is initialized using the number of Bobs because each Bob[i] needs to signal that they finished taking money out of the bank before the money can be counted.

This is an example of Map/Reduce. In the "Map" face, in program "main()", the syncrhonization semaphores are set up and the Bob task are created. The "Reduce" face is executed after all the Bob processes are done; in this face the amounts are totalized to verify that exactly the inital amount was withdrawn from the bank.

Field Summary

(package private) static int	GaZillion I have this much money.
(package private) static int	ManyBobs A bunch of Bobs compete to drain the bank account.

Constructor Summary

BobBank()

Method Summary

static void

main(String[] args) Main program.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GaZillion

static final int GaZillion

I have this much money.

See Also:

Constant Field Values

ManyBobs

static final int ManyBobs

A bunch of Bobs compete to drain the bank account.

See Also:

Constant Field Values

Constructor Detail

BobBank

public BobBank()

Method Detail

main

public static void main(String[] args)

Main program.