com.alibaba.metrics.os.windows.SystemLoadGaugeSet Maven / Gradle / Ivy

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package com.alibaba.metrics.os.windows;

import com.alibaba.metrics.CachedMetricSet;
import com.alibaba.metrics.Metric;
import com.alibaba.metrics.MetricName;
import com.alibaba.metrics.PersistentGauge;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.alibaba.metrics.os.utils.SystemInfoUtils.sigar;

public class SystemLoadGaugeSet extends CachedMetricSet {

    private Map gauges;

    private enum LoadAvg {
        ONE_MIN, FIVE_MIN, FIFTEEN_MIN
    }

    private float[] loadAvg;

    public SystemLoadGaugeSet() {
        this(DEFAULT_DATA_TTL, TimeUnit.MILLISECONDS);
    }

    public SystemLoadGaugeSet(long dataTTL, TimeUnit unit) {
        super(dataTTL, unit);
        loadAvg = new float[LoadAvg.values().length];
    }

    @Override
    public Map getMetrics() {
        final Map gauges = new HashMap();

        gauges.put(MetricName.build("load.1min"), new PersistentGauge() {
            @Override
            public Float getValue() {
                refreshIfNecessary();
                return loadAvg[LoadAvg.ONE_MIN.ordinal()];
            }
        });

        gauges.put(MetricName.build("load.5min"), new PersistentGauge() {
            @Override
            public Float getValue() {
                refreshIfNecessary();
                return loadAvg[LoadAvg.FIVE_MIN.ordinal()];
            }
        });

        gauges.put(MetricName.build("load.15min"), new PersistentGauge() {
            @Override
            public Float getValue() {
                refreshIfNecessary();
                return loadAvg[LoadAvg.FIFTEEN_MIN.ordinal()];
            }
        });

        return gauges;
    }

    @Override
    protected void getValueInternal() {
        double[] load = null;
        try {
            load = sigar.getLoadAverage();
        } catch (Throwable e) {
            // ignore
        }

        if (load == null) {
            return;
        }

        if (load.length > 0){
            loadAvg[LoadAvg.ONE_MIN.ordinal()] = (float) load[0];
        }

        if (load.length > 1){
            loadAvg[LoadAvg.FIVE_MIN.ordinal()] = (float) load[1];
        }

        if (load.length > 2){
            loadAvg[LoadAvg.FIFTEEN_MIN.ordinal()] = (float) load[2];
        }
    }

}