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Elasticsearch subproject :server

There is a newer version: 8.15.1

/*
 * 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.monitor.os;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.elasticsearch.common.settings.Setting;
import org.elasticsearch.common.settings.Setting.Property;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.util.SingleObjectCache;
import org.elasticsearch.common.util.concurrent.EsExecutors;
import org.elasticsearch.core.TimeValue;
import org.elasticsearch.node.ReportingService;

import java.io.IOException;

public class OsService implements ReportingService {

    private static final Logger logger = LogManager.getLogger(OsService.class);

    private final OsProbe probe;
    private final OsInfo info;
    private final SingleObjectCache osStatsCache;

    public static final Setting REFRESH_INTERVAL_SETTING = Setting.timeSetting(
        "monitor.os.refresh_interval",
        TimeValue.timeValueSeconds(1),
        TimeValue.timeValueSeconds(1),
        Property.NodeScope
    );

    public OsService(Settings settings) throws IOException {
        this.probe = OsProbe.getInstance();
        TimeValue refreshInterval = REFRESH_INTERVAL_SETTING.get(settings);
        this.info = probe.osInfo(refreshInterval.millis(), EsExecutors.nodeProcessors(settings));
        this.osStatsCache = new OsStatsCache(refreshInterval, probe.osStats());
        logger.debug("using refresh_interval [{}]", refreshInterval);
    }

    @Override
    public OsInfo info() {
        return this.info;
    }

    public OsStats stats() {
        return osStatsCache.getOrRefresh();
    }

    private class OsStatsCache extends SingleObjectCache {
        OsStatsCache(TimeValue interval, OsStats initValue) {
            super(interval, initValue);
        }

        @Override
        protected OsStats refresh() {
            return probe.osStats();
        }
    }
}