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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.cluster;
import org.elasticsearch.cluster.service.ClusterService;
/**
* A component that is in charge of applying an incoming cluster state to the node internal data structures.
* The single apply method is called before the cluster state becomes visible via {@link ClusterService#state()}.
*/
public interface ClusterStateApplier {
/**
* Called when a new cluster state ({@link ClusterChangedEvent#state()} needs to be applied. The cluster state to be applied is already
* committed when this method is called, so an applier must therefore be prepared to deal with any state it receives without throwing
* an exception. Throwing an exception from an applier is very bad because it will stop the application of this state before it has
* reached all the other appliers, and will likely result in another attempt to apply the same (or very similar) cluster state which
* might continue until this node is removed from the cluster.
*/
void applyClusterState(ClusterChangedEvent event);
}