ajanta.pattern
Class Selection

java.lang.Object
  |
  +--ajanta.pattern.Pattern
        |
        +--ajanta.pattern.PatternCollection
              |
              +--ajanta.pattern.Selection

All Implemented Interfaces:

java.lang.Cloneable, java.io.Serializable

public class Selection

extends PatternCollection

This emulates conditional control structure. The traversal of this pattern implies choosing one pattern from the list based on a user-defined choosePattern method. This choice could be made on basis of the agent's state or the hosts to be visited in the pattern. Strategies for making a selection could be randomized, priority-based, etc. This pattern is also useful in selecting alternate paths in case of failures, like unavailability of hosts.

See Also:

Serialized Form

Field Summary

Fields inherited from class ajanta.pattern.PatternCollection

current, list

Fields inherited from class ajanta.pattern.Pattern

action, DONE, FAILED, NOTDONE, status

Constructor Summary

Selection()

Method Summary

protected ajanta.pattern.Pattern	chooseNext() Selects next pattern to execute
protected int	choosePattern() It will determine the location of the next Pattern in the list by modifying value of current .
protected int	next(ajanta.server.AgentEnv host) Based on a user-defined choosePattern method it find next pattern to be executed and call next on that.
protected void	scan() An empty method ....can overridden in derived classes

Methods inherited from class ajanta.pattern.PatternCollection

currentEntry, firstEntry, insert, join, print, reset

Methods inherited from class ajanta.pattern.Pattern

getName, setName

Methods inherited from class java.lang.Object

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

Constructor Detail

Selection

public Selection()

Method Detail

next

protected int next(ajanta.server.AgentEnv host)
            throws java.net.UnknownHostException

Based on a user-defined choosePattern method it find next pattern to be executed and call next on that. This is performed as long as there is some patterns which has not be DONE.

Specified by:

next in class Pattern

java.net.UnknownHostException

scan

protected void scan()

An empty method ....can overridden in derived classes

Specified by:

scan in class Pattern

chooseNext

protected ajanta.pattern.Pattern chooseNext()

Selects next pattern to execute

choosePattern

protected int choosePattern()

It will determine the location of the next Pattern in the list by modifying value of current . It is application specific method and should be appropraitely overridden. Currenyly it provides sequential order