Module org.elasticsearch.server

Package org.elasticsearch.cluster

Class SafeClusterStateSupplier

java.lang.Object

org.elasticsearch.cluster.SafeClusterStateSupplier

All Implemented Interfaces:

Supplier<Optional<ClusterState>>, ClusterStateListener, ClusterStateSupplier

public class SafeClusterStateSupplier
extends Object
implements ClusterStateSupplier, ClusterStateListener

Utility to access ClusterState only when it is "ready", where "ready" means that we received a first clusterChanged event with no global block of type STATE_NOT_RECOVERED_BLOCK This guarantees that: - the initial cluster state has been set (see ClusterApplierService.setInitialState(ClusterState)); - the initial recovery process has completed.

Constructor Summary

Constructors

Constructor	Description
SafeClusterStateSupplier()

Method Summary

Modifier and Type	Method	Description
void	clusterChanged(ClusterChangedEvent event)	Called when cluster state changes.
Optional<ClusterState>	get()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.elasticsearch.cluster.ClusterStateSupplier

withCurrentClusterState

Constructor Details

SafeClusterStateSupplier

public SafeClusterStateSupplier()

Method Details

clusterChanged

public void clusterChanged(ClusterChangedEvent event)

Description copied from interface: ClusterStateListener

Called when cluster state changes.

Cluster states are applied one-by-one which means they can be a performance bottleneck. Implementations of this method should therefore be fast, so please consider forking work into the background rather than doing everything inline.

Specified by:

clusterChanged in interface ClusterStateListener

get

public Optional<ClusterState> get()

Specified by:

get in interface Supplier<Optional<ClusterState>>