/*
* Licensed to ElasticSearch and Shay Banon 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.index.settings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.AbstractIndexComponent;
import org.elasticsearch.index.Index;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* A holds to the latest, updated settings for an index.
*/
public class IndexSettingsService extends AbstractIndexComponent {
private volatile Settings settings;
private final CopyOnWriteArrayList<Listener> listeners = new CopyOnWriteArrayList<Listener>();
@Inject
public IndexSettingsService(Index index, Settings settings) {
super(index, settings);
this.settings = settings;
}
public synchronized void refreshSettings(Settings settings) {
// this.settings include also the node settings
if (this.settings.getByPrefix("index.").getAsMap().equals(settings.getByPrefix("index.").getAsMap())) {
// nothing to update, same settings
return;
}
this.settings = ImmutableSettings.settingsBuilder().put(this.settings).put(settings).build();
for (Listener listener : listeners) {
try {
listener.onRefreshSettings(settings);
} catch (Exception e) {
logger.warn("failed to refresh settings for [{}]", e, listener);
}
}
}
public Settings getSettings() {
return this.settings;
}
public void addListener(Listener listener) {
this.listeners.add(listener);
}
public void removeListener(Listener listener) {
this.listeners.remove(listener);
}
public static interface Listener {
void onRefreshSettings(Settings settings);
}
}