de.rahn.finances.commons.metrics.MetricsExporterService.java Source code

Introduction

Here is the source code for de.rahn.finances.commons.metrics.MetricsExporterService.java

Source

/*
 * Copyright 2011-2016 Frank W. Rahn and the project authors.
 *
 * Licensed 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 de.rahn.finances.commons.metrics;

import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.slf4j.LoggerFactory.getLogger;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import com.codahale.metrics.MetricRegistry;
import com.codahale.metrics.Snapshot;

/**
 * Diser Service exportiert die Dropwizard Metriken.<br>
 * <br>
 * In diesem Fall loggt der Service die Metriken periodisch.
 *
 * @author Frank W. Rahn
 */
@Service
public class MetricsExporterService {

    private static final Logger LOGGER = getLogger("reporting-metrics");

    @Autowired
    private MetricRegistry registry;

    private double rateFactor;

    private String rateUnit;

    private double durationFactor;

    private String durationUnit;

    /**
     * Initialisiere den Reporter.
     */
    @PostConstruct
    public void initialize() {
        rateFactor = SECONDS.toSeconds(1);
        rateUnit = "second";
        durationFactor = 1.0 / MILLISECONDS.toNanos(1);
        durationUnit = "milliseconds";
    }

    /**
     * Schreibe jede volle Stunde die aktuellen Metriken und setze sie zurck.
     */
    @Scheduled(cron = "0 0 * * * ?")
    public void exportMetrics() {
        StringBuilder builder = new StringBuilder();

        registry.getGauges().forEach((s, m) -> {
            registry.remove(s);

            builder.append("metric=GAUGE,     name=").append(s).append(", value=").append(m.getValue())
                    .append('\n');
        });

        registry.getCounters().forEach((s, m) -> {
            registry.remove(s);

            builder.append("metric=COUNTER,   name=").append(s).append(", count=").append(m.getCount())
                    .append('\n');
        });

        registry.getHistograms().forEach((s, m) -> {
            registry.remove(s);

            Snapshot snapshot = m.getSnapshot();

            builder.append("metric=HISTOGRAM, name=").append(s).append(", count=").append(m.getCount())
                    .append(", min=").append(snapshot.getMin()).append(", max=").append(snapshot.getMax())
                    .append(", mean=").append(snapshot.getMean()).append(", stddev=").append(snapshot.getStdDev())
                    .append(", median=").append(snapshot.getMedian()).append(", 75%=")
                    .append(snapshot.get75thPercentile()).append(", 95%=").append(snapshot.get95thPercentile())
                    .append(", 98%=").append(snapshot.get98thPercentile()).append(", 99%=")
                    .append(snapshot.get99thPercentile()).append(", 99.9%=").append(snapshot.get999thPercentile())
                    .append('\n');
        });

        registry.getMeters().forEach((s, m) -> {
            registry.remove(s);

            builder.append("metric=METER,     name=").append(s).append(", count=").append(m.getCount())
                    .append(", mean-rate=").append(convertRate(m.getMeanRate())).append(", 1-minute-rate=")
                    .append(convertRate(m.getOneMinuteRate())).append(", 5-minute-rate=")
                    .append(convertRate(m.getFiveMinuteRate())).append(", 15-minute-rate=")
                    .append(convertRate(m.getFifteenMinuteRate())).append(", rate-unit=events/").append(rateUnit)
                    .append('\n');
        });

        registry.getTimers().forEach((s, m) -> {
            registry.remove(s);

            Snapshot snapshot = m.getSnapshot();

            builder.append("metric=TIMER,     name=").append(s).append(", count=").append(m.getCount())
                    .append(", mean-rate=").append(convertRate(m.getMeanRate())).append(", 1-minute-rate=")
                    .append(convertRate(m.getOneMinuteRate())).append(", 5-minute-rate=")
                    .append(convertRate(m.getFiveMinuteRate())).append(", 15-minute-rate=")
                    .append(convertRate(m.getFifteenMinuteRate())).append(", rate-unit=calls/").append(rateUnit)
                    .append(", min=").append(convertDuration(snapshot.getMin())).append(", max=")
                    .append(convertDuration(snapshot.getMax())).append(", mean=")
                    .append(convertDuration(snapshot.getMean())).append(", stddev=")
                    .append(convertDuration(snapshot.getStdDev())).append(", median=")
                    .append(convertDuration(snapshot.getMedian())).append(", 75%=")
                    .append(convertDuration(snapshot.get75thPercentile())).append(", 95%=")
                    .append(convertDuration(snapshot.get95thPercentile())).append(", 98%=")
                    .append(convertDuration(snapshot.get98thPercentile())).append(", 99%=")
                    .append(convertDuration(snapshot.get99thPercentile())).append(", 99.9%=")
                    .append(convertDuration(snapshot.get999thPercentile())).append(", duration-unit=")
                    .append(durationUnit).append('\n');
        });

        if (builder.length() > 0) {
            LOGGER.info(builder.insert(0, "\n***** Metrics Report *****\n").append("***************************")
                    .toString());
        }
    }

    private double convertDuration(double duration) {
        return duration * durationFactor;
    }

    private double convertRate(double rate) {
        return rate * rateFactor;
    }
}