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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.monitor.fs;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.util.SingleObjectCache;
import org.elasticsearch.env.NodeEnvironment;
import java.io.IOException;
/**
*/
public class FsService extends AbstractComponent {
private final FsProbe probe;
private final SingleObjectCache<FsInfo> fsStatsCache;
public final static Setting<TimeValue> REFRESH_INTERVAL_SETTING =
Setting.timeSetting("monitor.fs.refresh_interval", TimeValue.timeValueSeconds(1), TimeValue.timeValueSeconds(1), false, Setting.Scope.CLUSTER);
public FsService(Settings settings, NodeEnvironment nodeEnvironment) throws IOException {
super(settings);
this.probe = new FsProbe(settings, nodeEnvironment);
TimeValue refreshInterval = REFRESH_INTERVAL_SETTING.get(settings);
fsStatsCache = new FsInfoCache(refreshInterval, probe.stats());
logger.debug("Using probe [{}] with refresh_interval [{}]", probe, refreshInterval);
}
public FsInfo stats() {
return fsStatsCache.getOrRefresh();
}
private class FsInfoCache extends SingleObjectCache<FsInfo> {
public FsInfoCache(TimeValue interval, FsInfo initValue) {
super(interval, initValue);
}
@Override
protected FsInfo refresh() {
try {
return probe.stats();
} catch (IOException ex) {
logger.warn("Failed to fetch fs stats - returning empty instance");
return new FsInfo();
}
}
}
}
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