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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.watcher;
import java.io.IOException;
/**
* Abstract resource watcher interface.
*
* Different resource watchers can be registered with {@link ResourceWatcherService} to be called
* periodically in order to check for changes in different external resources.
*/
public interface ResourceWatcher {
/**
* Called once when the resource watcher is added to {@link ResourceWatcherService}
*/
void init() throws IOException;
/**
* Called periodically by {@link ResourceWatcherService} so resource watcher can check the resource
*/
void checkAndNotify() throws IOException;
}
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