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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.service;
import org.elasticsearch.cluster.ClusterState;
import java.util.function.Supplier;
public interface ClusterApplier {
/**
* Sets the initial state for this applier. Should only be called once.
* @param initialState the initial state to set
*/
void setInitialState(ClusterState initialState);
/**
* Method to invoke when a new cluster state is available to be applied
*
* @param source information where the cluster state came from
* @param clusterStateSupplier the cluster state supplier which provides the latest cluster state to apply
* @param listener callback that is invoked after cluster state is applied
*/
void onNewClusterState(String source, Supplier clusterStateSupplier, ClusterApplyListener listener);
/**
* Listener for results of cluster state application
*/
interface ClusterApplyListener {
/**
* Called on successful cluster state application
* @param source information where the cluster state came from
*/
default void onSuccess(String source) {
}
/**
* Called on failure during cluster state application
* @param source information where the cluster state came from
* @param e exception that occurred
*/
void onFailure(String source, Exception e);
}
}