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/*
* 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;
/**
* Enables listening to master changes events of the local node (when the local node becomes the master, and when the local
* node cease being a master).
*/
public interface LocalNodeMasterListener extends ClusterStateListener {
/**
* Called when local node is elected to be the master
*/
void onMaster();
/**
* Called when the local node used to be the master, a new master was elected and it's no longer the local node.
*/
void offMaster();
@Override
default void clusterChanged(ClusterChangedEvent event) {
final boolean wasMaster = event.previousState().nodes().isLocalNodeElectedMaster();
final boolean isMaster = event.localNodeMaster();
if (wasMaster == false && isMaster) {
onMaster();
} else if (wasMaster && isMaster == false) {
offMaster();
}
}
}