Class BarrierMap

java.lang.Object
  BarrierMap

public class BarrierMap
extends Object

This class shows how to synchronice a bunch of people who perform many activities. The main requirement is that no one will be performing activity n+1 until every body finised activity n. Each person is called Bob[i].

• In the main program, a loop is used to perform each activity.
• Semaphore BarrierMap.reduce is created anew on each cicle to initialize it with one permito for each Bobs. Thi semaphore is used to know when all the Bobs are done.

This is an example of a centralized authority that lets many processes rund concurrently without knowing that they are executing in parallel. In a distributed systems this central authority does not exist.

This is an example of Map/Reduce. In the "Map" face, in programa "main()", the syncrhonization semaphores are set up and the Bob processes are created. The "Reduce" is executed after all the Bob processes are done.

Constructor Summary

BarrierMap()

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

Constructor Detail

BarrierMap

public BarrierMap()

Method Detail

main

public static void main(String[] args)

Main program.