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Elasticsearch subproject :server
/*
* 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.apache.logging.log4j.Logger;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
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 TimeValue refreshInterval;
private final SingleObjectCache cache;
public static final Setting REFRESH_INTERVAL_SETTING =
Setting.timeSetting(
"monitor.fs.refresh_interval",
TimeValue.timeValueSeconds(1),
TimeValue.timeValueSeconds(1),
Property.NodeScope);
public FsService(final Settings settings, final NodeEnvironment nodeEnvironment) {
super(settings);
this.probe = new FsProbe(settings, nodeEnvironment);
refreshInterval = REFRESH_INTERVAL_SETTING.get(settings);
logger.debug("using refresh_interval [{}]", refreshInterval);
cache = new FsInfoCache(refreshInterval, stats(probe, null, logger));
}
public FsInfo stats() {
return cache.getOrRefresh();
}
private static FsInfo stats(FsProbe probe, FsInfo initialValue, Logger logger) {
try {
return probe.stats(initialValue);
} catch (IOException e) {
logger.debug("unexpected exception reading filesystem info", e);
return null;
}
}
private class FsInfoCache extends SingleObjectCache {
private final FsInfo initialValue;
public FsInfoCache(TimeValue interval, FsInfo initialValue) {
super(interval, initialValue);
this.initialValue = initialValue;
}
@Override
protected FsInfo refresh() {
return stats(probe, initialValue, logger);
}
}
}