Java Metrics

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转载最新推荐文章于 2026-05-30 13:49:57 发布 895 阅读 AI 写同款· GEO 优化 ›

GEE APP：基于Sentinel-2遥感影像的植被指数（NDVI）和水体指数（NDWI）可视化应用本文介绍了利用Google Earth Engine（GEE）平台处理Sentinel-2卫星数据的方法，重点讲解NDVI（归一化植被指数）和NDWI（归一化水体指数）的计算与应用。内容包括环境准备、数据加载与处理、指数计算原理、可视化方法以及实际应用案例。教程详细展示了如何定义研究区域、加载影像数据、进行指数运算，并生成专业统计报告和图例。文章还提供了常见问题解答和最佳实践建议，为生态环境监测、农业评估和水资源管理等场景提供了实用工具。通过JavaScript代码示例，读者可以快速掌握GEE平台的遥感影像阅读详情

http://blog.youkuaiyun.com/wsscy2004/article/details/40423669

Java Metrics

Java Metrics是一个功能比较强大的java统计库，它的输出组件也很强大，帮我们做好了：

输出到Ganglia
输出到控制台
输出到JMX
输出Json

详细见：dropwizard.github.io/metrics/

依赖

添加依赖，如gradle:

<code class="hljs css" style="display: block; padding: 0.5em; background-color: rgb(35, 36, 31); color: rgb(248, 248, 242); font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; margin-top: 0px !important; background-position: initial initial; background-repeat: initial initial;">    <span class="hljs-tag" style="color: rgb(249, 38, 114); margin-top: 0px !important;">compile</span> "<span class="hljs-tag" style="color: rgb(249, 38, 114);">io</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.dropwizard</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.metrics</span><span class="hljs-pseudo" style="color: rgb(230, 219, 116);">:metrics-core</span><span class="hljs-pseudo" style="color: rgb(230, 219, 116);">:3</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.1</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.0</span>"
    <span class="hljs-tag" style="color: rgb(249, 38, 114);">compile</span> "<span class="hljs-tag" style="color: rgb(249, 38, 114);">io</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.dropwizard</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.metrics</span><span class="hljs-pseudo" style="color: rgb(230, 219, 116);">:metrics-ganglia</span><span class="hljs-pseudo" style="color: rgb(230, 219, 116);">:3</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.1</span><span class="hljs-class" style="color: rgb(166, 226, 46);">.0</span>"
</code>

如果需要ganglia输出功能，则需要metrics-ganglia包。我写的自动压测工具test-framework主要用失败计数，QPS统计。

统计调用频率

计数型的统计，比如计算失败次数，每次+1,则可以用Meter

<code class="hljs cs" style="display: block; padding: 0.5em; background-color: rgb(35, 36, 31); color: rgb(248, 248, 242); font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; margin-top: 0px !important; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(249, 38, 114); margin-top: 0px !important;">public</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">class</span> GetStarted {
    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> final MetricRegistry metrics = <span class="hljs-keyword" style="color: rgb(249, 38, 114);">new</span> MetricRegistry();
    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">public</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">void</span> <span class="hljs-title" style="color: rgb(166, 226, 46);">main</span>(String args[]) {
        startReport();
        <span class="hljs-comment" style="color: rgb(117, 113, 94);">//metrics:事件总数，平均速率,包含1分钟，5分钟，15分钟的速率</span>
        Meter requests = metrics.meter(<span class="hljs-string" style="color: rgb(230, 219, 116);">"requests"</span>);
        <span class="hljs-comment" style="color: rgb(117, 113, 94);">//计数一次</span>
        requests.mark();
        wait5Seconds();
    }

    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">void</span> startReport() {
        <span class="hljs-comment" style="color: rgb(117, 113, 94);">//注册metrics,每个1秒打印metrics到控制台</span>
        ConsoleReporter reporter = ConsoleReporter.forRegistry(metrics)
                .convertRatesTo(TimeUnit.SECONDS)
                .convertDurationsTo(TimeUnit.MILLISECONDS)
                .build();
        reporter.start(<span class="hljs-number" style="color: rgb(174, 129, 255);">1</span>, TimeUnit.SECONDS);
    }

    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">void</span> wait5Seconds() {
        <span class="hljs-keyword" style="color: rgb(249, 38, 114);">try</span> {
            Thread.sleep(<span class="hljs-number" style="color: rgb(174, 129, 255);">5</span>*<span class="hljs-number" style="color: rgb(174, 129, 255);">1000</span>);
        }
        <span class="hljs-keyword" style="color: rgb(249, 38, 114);">catch</span>(InterruptedException e) {}
    }
}
</code>

效果：

<code class="hljs diff" style="display: block; padding: 0.5em; background-color: rgb(35, 36, 31); color: rgb(248, 248, 242); font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; margin-top: 0px !important; background-position: initial initial; background-repeat: initial initial;">14-10-14 21:28:53 <span class="hljs-header" style="color: rgb(249, 38, 114); font-weight: bold; margin-top: 0px !important;">==============================================================</span>

<span class="hljs-deletion" style="background-color: rgb(255, 200, 189); color: rgb(117, 113, 94);">-- Meters ----------------------------------------------------------------------</span>
requests
             count = 1
         mean rate = 1.00 events/second
     1-minute rate = 0.00 events/second
     5-minute rate = 0.00 events/second
    15-minute rate = 0.00 events/second


14-10-14 21:28:54 <span class="hljs-header" style="color: rgb(249, 38, 114); font-weight: bold;">==============================================================</span>

<span class="hljs-deletion" style="background-color: rgb(255, 200, 189); color: rgb(117, 113, 94);">-- Meters ----------------------------------------------------------------------</span>
requests
             count = 1
         mean rate = 0.51 events/second
     1-minute rate = 0.00 events/second
     5-minute rate = 0.00 events/second
    15-minute rate = 0.00 events/second


14-10-14 21:28:55 <span class="hljs-header" style="color: rgb(249, 38, 114); font-weight: bold;">==============================================================</span>

<span class="hljs-deletion" style="background-color: rgb(255, 200, 189); color: rgb(117, 113, 94);">-- Meters ----------------------------------------------------------------------</span>
requests
             count = 1
         mean rate = 0.33 events/second
     1-minute rate = 0.00 events/second
     5-minute rate = 0.00 events/second
    15-minute rate = 0.00 events/second


14-10-14 21:28:56 <span class="hljs-header" style="color: rgb(249, 38, 114); font-weight: bold;">==============================================================</span>

<span class="hljs-deletion" style="background-color: rgb(255, 200, 189); color: rgb(117, 113, 94);">-- Meters ----------------------------------------------------------------------</span>
requests
             count = 1
         mean rate = 0.25 events/second
     1-minute rate = 0.00 events/second
     5-minute rate = 0.00 events/second
    15-minute rate = 0.00 events/second


14-10-14 21:28:57 <span class="hljs-header" style="color: rgb(249, 38, 114); font-weight: bold;">==============================================================</span>

<span class="hljs-deletion" style="background-color: rgb(255, 200, 189); color: rgb(117, 113, 94);">-- Meters ----------------------------------------------------------------------</span>
requests
             count = 1
         mean rate = 0.20 events/second
     1-minute rate = 0.00 events/second
     5-minute rate = 0.00 events/second
    15-minute rate = 0.00 events/second
</code>

统计QPS

根据时间来计算qps，可以用Timer

<code class="hljs java" style="display: block; padding: 0.5em; background-color: rgb(35, 36, 31); color: rgb(248, 248, 242); font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; margin-top: 0px !important; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-keyword" style="color: rgb(249, 38, 114); margin-top: 0px !important;">public</span> <span class="hljs-class"><span class="hljs-keyword" style="color: rgb(102, 217, 239); margin-top: 0px !important;">class</span> <span class="hljs-title" style="color: rgb(166, 226, 46); font-style: italic;">TimerTest</span> </span>{
    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">final</span> MetricRegistry metrics = <span class="hljs-keyword" style="color: rgb(249, 38, 114);">new</span> MetricRegistry();
    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">private</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> Timer timer = metrics.timer(MetricRegistry.name(TimerTest.class, <span class="hljs-string" style="color: rgb(230, 219, 116);">"calculation-duration"</span>));
    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">public</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">void</span> <span class="hljs-title" style="color: rgb(166, 226, 46);">main</span>(String[] args) <span class="hljs-keyword" style="color: rgb(249, 38, 114);">throws</span> InterruptedException {
        <span class="hljs-comment" style="color: rgb(117, 113, 94);">// TODOAuto-generated method stub</span>
        startReport();
        Random rn = <span class="hljs-keyword" style="color: rgb(249, 38, 114);">new</span> Random();
        <span class="hljs-keyword" style="color: rgb(249, 38, 114);">while</span> (<span class="hljs-keyword" style="color: rgb(249, 38, 114);">true</span>) {
            <span class="hljs-comment" style="color: rgb(117, 113, 94);">//统计开始</span>
            <span class="hljs-keyword" style="color: rgb(249, 38, 114);">final</span> Timer.Context context = timer.time();
            <span class="hljs-keyword" style="color: rgb(249, 38, 114);">int</span> sleepTime = rn.nextInt(<span class="hljs-number" style="color: rgb(174, 129, 255);">2000</span>);
            Thread.sleep(sleepTime);
            System.out.println(<span class="hljs-string" style="color: rgb(230, 219, 116);">"处理耗时:"</span> + sleepTime);
            <span class="hljs-comment" style="color: rgb(117, 113, 94);">//统计结束</span>
            context.stop();
        }
    }
    <span class="hljs-keyword" style="color: rgb(249, 38, 114);">static</span> <span class="hljs-keyword" style="color: rgb(249, 38, 114);">void</span> startReport() {
        <span class="hljs-comment" style="color: rgb(117, 113, 94);">//注册metrics,每个1秒打印metrics到控制台</span>
        ConsoleReporter reporter = ConsoleReporter.forRegistry(metrics)
                .convertRatesTo(TimeUnit.SECONDS)
                .convertDurationsTo(TimeUnit.MILLISECONDS)
                .build();
        reporter.start(<span class="hljs-number" style="color: rgb(174, 129, 255);">1</span>, TimeUnit.SECONDS);
    }

}
</code>

结果：

<code class="hljs diff" style="display: block; padding: 0.5em; background-color: rgb(35, 36, 31); color: rgb(248, 248, 242); font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; margin-top: 0px !important; background-position: initial initial; background-repeat: initial initial;">处理耗时:996
14-10-14 22:40:34 <span class="hljs-header" style="color: rgb(249, 38, 114); font-weight: bold; margin-top: 0px !important;">==============================================================</span>

<span class="hljs-deletion" style="background-color: rgb(255, 200, 189); color: rgb(117, 113, 94);">-- Timers ----------------------------------------------------------------------</span>
com.edwardsbean.test.TimerTest.calculation-duration
             count = 1
         mean rate = 0.91 calls/second
     1-minute rate = 0.00 calls/second
     5-minute rate = 0.00 calls/second
    15-minute rate = 0.00 calls/second
               min = 995.91 milliseconds
               max = 995.91 milliseconds
              mean = 995.91 milliseconds
            stddev = 0.00 milliseconds
            median = 995.91 milliseconds
              75% <= 995.91 milliseconds
              95% <= 995.91 milliseconds
              98% <= 995.91 milliseconds
              99% <= 995.91 milliseconds
            99.9% <= 995.91 milliseconds


14-10-14 22:40:35 <span class="hljs-header" style="color: rgb(249, 38, 114); font-weight: bold;">==============================================================</span>

<span class="hljs-deletion" style="background-color: rgb(255, 200, 189); color: rgb(117, 113, 94);">-- Timers ----------------------------------------------------------------------</span>
com.edwardsbean.test.TimerTest.calculation-duration
             count = 1
         mean rate = 0.48 calls/second
     1-minute rate = 0.00 calls/second
     5-minute rate = 0.00 calls/second
    15-minute rate = 0.00 calls/second
               min = 995.91 milliseconds
               max = 995.91 milliseconds
              mean = 995.91 milliseconds
            stddev = 0.00 milliseconds
            median = 995.91 milliseconds
              75% <= 995.91 milliseconds
              95% <= 995.91 milliseconds
              98% <= 995.91 milliseconds
              99% <= 995.91 milliseconds
            99.9% <= 995.91 milliseconds
</code>

关于输出

每一个输出组件都有一个对应的Reporter主类，比如Ganglia:

<code class="hljs cpp" style="display: block; padding: 0.5em; background-color: rgb(35, 36, 31); color: rgb(248, 248, 242); font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; margin-top: 0px !important; background-position: initial initial; background-repeat: initial initial;">GMetric ganglia = <span class="hljs-keyword" style="color: rgb(249, 38, 114); margin-top: 0px !important;">new</span> GMetric(address[<span class="hljs-number" style="color: rgb(174, 129, 255);">0</span>].getHostName(), address[<span class="hljs-number" style="color: rgb(174, 129, 255);">0</span>].getPort(), GMetric.UDPAddressingMode.MULTICAST, <span class="hljs-number" style="color: rgb(174, 129, 255);">1</span>);

GangliaReporter gangliaReporter = GangliaReporter.forRegistry(metricRegistry)
                .convertRatesTo(TimeUnit.SECONDS)
                .convertDurationsTo(TimeUnit.MILLISECONDS)
                .build(ganglia);
<span class="hljs-comment" style="color: rgb(117, 113, 94);">//开始汇报</span>
gangliaReporter.start(<span class="hljs-number" style="color: rgb(174, 129, 255);">1</span>, TimeUnit.SECONDS);
</code>

而输出控制台的Reporter

<code class="hljs objectivec" style="display: block; padding: 0.5em; background-color: rgb(35, 36, 31); color: rgb(248, 248, 242); font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; margin-top: 0px !important; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); margin-top: 0px !important;">###</span>
ConsoleReporter reporter = ConsoleReporter<span class="hljs-variable" style="color: rgb(102, 0, 102);">.forRegistry</span>(metrics)
                <span class="hljs-variable" style="color: rgb(102, 0, 102);">.convertRatesTo</span>(TimeUnit<span class="hljs-variable" style="color: rgb(102, 0, 102);">.SECONDS</span>)
                <span class="hljs-variable" style="color: rgb(102, 0, 102);">.convertDurationsTo</span>(TimeUnit<span class="hljs-variable" style="color: rgb(102, 0, 102);">.MILLISECONDS</span>)
                <span class="hljs-variable" style="color: rgb(102, 0, 102);">.build</span>();
reporter<span class="hljs-variable" style="color: rgb(102, 0, 102);">.start</span>(<span class="hljs-number" style="color: rgb(174, 129, 255);">1</span>, TimeUnit<span class="hljs-variable" style="color: rgb(102, 0, 102);">.SECONDS</span>);</code>

<code style="font-family: Menlo, Monaco, Consolas, 'Courier New', monospace; padding: 0px; color: inherit; background-color: transparent; margin-top: 0px !important;"></code>

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