co.cask.coopr.layout.change

Class ClusterLayoutTracker

java.lang.Object

co.cask.coopr.layout.change.ClusterLayoutTracker

public class ClusterLayoutTracker
extends Object

Helper for keeping track of changes made to a ClusterLayout.

Constructor Summary

Constructors

Constructor and Description
ClusterLayoutTracker(ClusterLayout startingLayout) Create a layout change tracker given some starting layout.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	addChangeIfValid(ClusterLayoutChange change) Adds a change to the layout if the change can be applied to the current layout, returning whether or not the change was added.
Queue<ClusterLayoutChange>	getChanges() Get the changes that were applied to the starting cluster layout.
ClusterLayout	getCurrentLayout() Get the current layout of the cluster.
void	removeLastChange() Remove the last change performed on the cluster layout.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClusterLayoutTracker

public ClusterLayoutTracker(ClusterLayout startingLayout)

Create a layout change tracker given some starting layout.

Parameters:

startingLayout - starting layout of the cluster.

Method Detail

addChangeIfValid

public boolean addChangeIfValid(ClusterLayoutChange change)

Adds a change to the layout if the change can be applied to the current layout, returning whether or not the change was added.

Parameters:

change - Change to add, assuming it can be applied to the current layout.

Returns:

True if the change was added, false if not.

removeLastChange

public void removeLastChange()

Remove the last change performed on the cluster layout.

getCurrentLayout

public ClusterLayout getCurrentLayout()

Get the current layout of the cluster.

Returns:

Current layout of the cluster.

getChanges

public Queue<ClusterLayoutChange> getChanges()

Get the changes that were applied to the starting cluster layout.

Returns:

Changes that were applied to the starting cluster layout.