/
ClusterInfoService.java
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/
ClusterInfoService.java
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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.cluster;
/**
* Interface for a class used to gather information about a cluster at
* regular intervals
*/
public interface ClusterInfoService {
public static ClusterInfoService EMPTY = EmptyClusterInfoService.getInstance();
/** The latest cluster information */
public ClusterInfo getClusterInfo();
/** Add a listener that will be called every time new information is gathered */
public void addListener(Listener listener);
/**
* Interface for listeners to implement in order to perform actions when
* new information about the cluster has been gathered
*/
public interface Listener {
public void onNewInfo(ClusterInfo info);
}
}