Package org.apache.sling.discovery.oak.cluster

Class ClusterReader

java.lang.Object

org.apache.sling.discovery.oak.cluster.ClusterReader

public class ClusterReader
extends Object

Helper class to detect instances that are only partially started. Partially in this context means that they have updated their Oak lease but have not written the required data on the Sling level (which includes the idmap, the synctoken and the leaderElectionid).

Constructor Summary

Constructors

Constructor	Description
ClusterReader(org.apache.sling.api.resource.ResourceResolver resourceResolver, Config config, org.apache.sling.discovery.commons.providers.spi.base.IdMapService idMapService, Map<Integer,InstanceInfo> seenLocalInstances)

Method Summary

Modifier and Type	Method	Description
InstanceReadResult	readInstance(int clusterNodeId, boolean failOnMissingSyncToken, long seqNum)	Reads all discovery.oak related data for clusterNodeId and fills the internal structure with the resulting info - or remembers that the clusterNode was incomplete (partially started)

Methods inherited from class java.lang.Object

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

Constructor Detail

ClusterReader

public ClusterReader(org.apache.sling.api.resource.ResourceResolver resourceResolver,
                     Config config,
                     org.apache.sling.discovery.commons.providers.spi.base.IdMapService idMapService,
                     Map<Integer,InstanceInfo> seenLocalInstances)

Method Detail

readInstance

public InstanceReadResult readInstance(int clusterNodeId,
                                       boolean failOnMissingSyncToken,
                                       long seqNum)
                                throws org.apache.sling.api.resource.PersistenceException

Reads all discovery.oak related data for clusterNodeId and fills the internal structure with the resulting info - or remembers that the clusterNode was incomplete (partially started)

Parameters:

clusterNodeId - the clusterNodeId to be read

Returns:

the instance if it is has all required data stored (which does not necessarily mean it has completely started - syncToken is not checked at this stage yet)

Throws:

org.apache.sling.api.resource.PersistenceException