co.cask.coopr.spec.template

Class LayoutConstraint

java.lang.Object

co.cask.coopr.spec.template.LayoutConstraint

public final class LayoutConstraint
extends Object

A Layout constraint specifies sets of services that must coexist on the same node, and sets of services that must not coexist on the same node in a cluster. These constraints are used to determine which services can be placed together when solving for the layout of a cluster.

Field Summary

Fields

Modifier and Type	Field and Description
static LayoutConstraint	EMPTY_LAYOUT_CONSTRAINT

Constructor Summary

Constructors

Constructor and Description
LayoutConstraint(Set<Set<String>> servicesThatMustCoexist, Set<Set<String>> servicesThatMustNotCoexist)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
Set<Set<String>>	getServicesThatMustCoexist() Get the set of service sets that must coexist on the same node in the cluster.
Set<Set<String>>	getServicesThatMustNotCoexist() Get the set of service sets that must not coexist on the same node in the cluster.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

EMPTY_LAYOUT_CONSTRAINT

public static final LayoutConstraint EMPTY_LAYOUT_CONSTRAINT

Constructor Detail

LayoutConstraint

public LayoutConstraint(Set<Set<String>> servicesThatMustCoexist,
                Set<Set<String>> servicesThatMustNotCoexist)

Method Detail

getServicesThatMustCoexist

public Set<Set<String>> getServicesThatMustCoexist()

Get the set of service sets that must coexist on the same node in the cluster. These rules are not transitive. For example, if {serviceA, serviceB} must coexist, and {serviceB, serviceC} must coexist, this does NOT mean that serviceA and serviceC must coexist.

Returns:

Set of service sets that must coexist on the same node in the cluster.

getServicesThatMustNotCoexist

public Set<Set<String>> getServicesThatMustNotCoexist()

Get the set of service sets that must not coexist on the same node in the cluster. For example, if {datanode, zookeeper, nodemanager} is a service set that must not coexist, this means no node in the cluster can have all three of those services on it. However, this service set would not disallow datanode and zookeeper to be on the same node, just the full set of services.

Returns:

Set of service sets that must not coexist on the same node in the cluster.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object