2

我尝试使用 dropWizard 库获取 JVM 指标值（MemoryUsageGaugeSet、GarbageCollectionUsageGaugeSet）

 <dependency>
    <groupId>io.dropwizard.metrics</groupId>
    <artifactId>metrics-jvm</artifactId>
    <version>3.1.2</version>
 </dependency>

代码实现。

  public static void main(String[] args ){
  MemoryUsageGaugeSet memory = new MemoryUsageGaugeSet();
  Map<String, Metric> memoryMap = memory.getMetrics();
  system.out.println( memoryMap);}

我得到的结果是

{heap.committed=com.codahale.metrics.jvm.MemoryUsageGaugeSet$8@d16011, non-heap.used=com.codahale.metrics.jvm.MemoryUsageGaugeSet$11@cc09904, pools.Code-Cache.used=com.codahale.metrics .jvm.MemoryUsageGaugeSet$17@748032cc, pools.Code-Cache.committed=com.codahale.metrics.jvm.MemoryUsageGaugeSet$18@2b6e0423, heap.used=com.codahale.metrics.jvm.MemoryUsageGaugeSet$6@203428b7, pools.PS- Old-Gen.init=com.codahale.metrics.jvm.MemoryUsageGaugeSet$19@28b49d0c，total.committed=com.codahale.metrics.jvm.MemoryUsageGaugeSet$4@5dd7cc84，pools.PS-Old-Gen.max=com.codahale。 metrics.jvm.MemoryUsageGaugeSet$16@6438401，total.init=com.codahale.metrics.jvm.MemoryUsageGaugeSet$1@7b365ee，非 heap.max=com.codahale.metrics.jvm.MemoryUsageGaugeSet$12@be3d4e9，pools.PS-Eden -Space.init=com.codahale.metrics.jvm.MemoryUsageGaugeSet$19@68339afd，pools.Compressed-Class-Space。used=com.codahale.metrics.jvm.MemoryUsageGaugeSet$17@724a6876, pools.Metaspace.usage=com.codahale.metrics.jvm.MemoryUsageGaugeSet$15@6ecaffc4, pools.Metaspace.max=com.codahale.metrics.jvm.MemoryUsageGaugeSet$16 @7b1b3a68，pools.PS-Eden-Space.committed=com.codahale.metrics.jvm.MemoryUsageGaugeSet$18@f8ba384，pools.PS-Eden-Space.max=com.codahale.metrics.jvm.MemoryUsageGaugeSet$16@2e2373db，池.Compressed-Class-Space.usage=com.codahale.metrics.jvm.MemoryUsageGaugeSet$15@17ae8d04, heap.usage=com.codahale.metrics.jvm.MemoryUsageGaugeSet$9@35c43de3, pools.PS-Eden-Space.usage=com .codahale.metrics.jvm.MemoryUsageGaugeSet$15@67013f5c, pools.PS-Survivor-Space.max=com.codahale.metrics.jvm.MemoryUsageGaugeSet$16@520935cc, pools.Code-Cache.max=com.codahale.metrics.jvm .MemoryUsageGaugeSet$16@31ac5424，pools.Compressed-Class-Space.init=com.codahale.metrics.jvm。MemoryUsageGaugeSet$19@25135cd7, pools.Metaspace.init=com.codahale.metrics.jvm.MemoryUsageGaugeSet$19@4b066cf6, pools.PS-Survivor-Space.usage=com.codahale.metrics.jvm.MemoryUsageGaugeSet$15@50ba970f, pools.PS -Old-Gen.usage=com.codahale.metrics.jvm.MemoryUsageGaugeSet$15@3e4e448, pools.Code-Cache.usage=com.codahale.metrics.jvm.MemoryUsageGaugeSet$15@3c2ef507, pools.PS-Survivor-Space.init =com.codahale.metrics.jvm.MemoryUsageGaugeSet$19@44374fa8，total.used=com.codahale.metrics.jvm.MemoryUsageGaugeSet$2@40b1aace，pools.Code-Cache.init=com.codahale.metrics.jvm.MemoryUsageGaugeSet$19@ 6453d034，pools.PS-Old-Gen.committed=com.codahale.metrics.jvm.MemoryUsageGaugeSet$18@2f9e8774，heap.init=com.codahale.metrics.jvm.MemoryUsageGaugeSet$5@512ad720，非 heap.committed=com。 codahale.metrics.jvm.MemoryUsageGaugeSet$13@1c80e011，pools.Compressed-Class-Space。已提交=com.codahale.metrics.jvm.MemoryUsageGaugeSet$18@662841c5，非堆.init=com.codahale.metrics.jvm.MemoryUsageGaugeSet$10@3dd6cf53，pools.PS-Eden-Space.used=com.codahale.metrics。 jvm.MemoryUsageGaugeSet$17@3a428c1e, non-heap.usage=com.codahale.metrics.jvm.MemoryUsageGaugeSet$14@21d9632f, heap.max=com.codahale.metrics.jvm.MemoryUsageGaugeSet$7@5db28b8, pools.PS-Survivor-Space .used=com.codahale.metrics.jvm.MemoryUsageGaugeSet$17@efcd307, pools.Metaspace.committed=com.codahale.metrics.jvm.MemoryUsageGaugeSet$18@20f09cba, total.max=com.codahale.metrics.jvm.MemoryUsageGaugeSet$3@ 4ada5390，pools.Metaspace.used=com.codahale.metrics.jvm.MemoryUsageGaugeSet$17@16982c9b，pools.Compressed-Class-Space.max=com.codahale.metrics.jvm.MemoryUsageGaugeSet$16@7e94b1a4，pools.PS-Survivor- Space.committed=com.codahale.metrics.jvm.MemoryUsageGaugeSet$18@5aa5f780,pools.PS-Old-Gen.used=com.codahale.metrics.jvm.MemoryUsageGaugeSet$17@427b7997}

我得到了对象的引用，而不是我想得到这些引用的值。为此该怎么办？

4

1 回答 1

2

要获取/打印对象的值，您需要toString()在类中实现并且MemoryUsageGaugeSet没有它。验证@javadoc

一种方法是使用您自己的实现来扩展该类toString()。

另一种方法是遍历地图并打印每个值。您可能想尝试以下类似的方法..

Map<String, Metric> memoryMap = memory.getMetrics();

for (String key : memoryMap.keySet()) {
    Metric m = memoryMap.get(key);
    System.out.println(m.getClass());

    if (m instanceof Gauge) {
        System.out.println(((Gauge<Long>) m).getValue());
    }
}

MemoryUsageGaugeSet导致Gauge<Long>which 是 的实现Metric。

希望这可以帮助。

于 2015-07-20T13:48:44.907 回答