co.cask.coopr.macro.eval

Class ServiceCardinalityEvaluator

java.lang.Object

co.cask.coopr.macro.eval.ServiceCardinalityEvaluator

All Implemented Interfaces:

Evaluator

public class ServiceCardinalityEvaluator
extends Object
implements Evaluator

Evaluates a macro that expands to be the number of nodes in the cluster that contain a given service.

Constructor Summary

Constructors

Constructor and Description
ServiceCardinalityEvaluator(String serviceName)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
List<String>	evaluate(Cluster cluster, Set<Node> clusterNodes, Node node) Evaluate the macro expression on the given node of the given cluster, with the given cluster nodes.
int	hashCode()

Methods inherited from class java.lang.Object

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

Constructor Detail

ServiceCardinalityEvaluator

public ServiceCardinalityEvaluator(String serviceName)

Method Detail

evaluate

public List<String> evaluate(Cluster cluster,
                    Set<Node> clusterNodes,
                    Node node)
                      throws IncompleteClusterException

Description copied from interface: Evaluator

Evaluate the macro expression on the given node of the given cluster, with the given cluster nodes. Returns null if the macro does not expand to anything.

Specified by:

evaluate in interface Evaluator

Parameters:

cluster - Cluster the macro is being expanded for.

clusterNodes - Nodes in the cluster the macro is being expanded for.

node - The cluster node that the macro is being expanded for.

Returns:

Evaluated macro expression.

Throws:

IncompleteClusterException - if the cluster does not contain the information required to evaluate the macro.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object