co.cask.coopr.macro.eval

Class ServiceInstanceEvaluator

java.lang.Object

co.cask.coopr.macro.eval.ServiceEvaluator

co.cask.coopr.macro.eval.ServiceInstanceEvaluator

All Implemented Interfaces:

Evaluator

public class ServiceInstanceEvaluator
extends ServiceEvaluator

Evaluates a macro that expands to be the instance number of the given node that contains the given service. For example, if there are 3 zookeeper nodes in the cluster, %instance.self.service.zookeeper% will evaluate to 1 for the first node with zookeeper, 2 for the second node with zookeeper, and 3 for the last node with zookeeper.

Field Summary

Fields inherited from class co.cask.coopr.macro.eval.ServiceEvaluator

serviceName

Constructor Summary

Constructors

Constructor and Description
ServiceInstanceEvaluator(String serviceName)

Method Summary

Methods

Modifier and Type	Method and Description
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.

Methods inherited from class co.cask.coopr.macro.eval.ServiceEvaluator

equals, getNthServiceNode, getServiceInstanceNum, hashCode, sortServiceNodes

Methods inherited from class java.lang.Object

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

Constructor Detail

ServiceInstanceEvaluator

public ServiceInstanceEvaluator(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.

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.