如何获取ehcache 3.1统计信息 [英] How to get ehcache 3.1 statistics

问题描述

在Ehcache 3.1中，我有一个案例来了解当前存储在ehcache中的元素的大小，以及到目前为止缓存已达到的命中和未命中的数量。我认为2.6具有.getStatistics（），它具有相似的功能，但是在3.1版本中却很难找到相同的功能。

With Ehcache 3.1, I have a case to know the size of elements that are currently stored in the ehcache and also the number of hits and misses that the cache has so far. I think the 2.6 has the .getStatistics(), which does the similar things, However the same feature i am struggling to find with 3.1 version.

感谢您的帮助！

推荐答案

对于Ehcache 3.5.2以及任何其他JCache Provider，您可以使用标准方法在缓存配置期间启用统计信息。实例：

For Ehcache 3.5.2 as well as for any other JCache Provider you can use standard methods to enable statistics during cache configuration For instanse:

...
MutableConfiguration<Path, String> config = new MutableConfiguration<>();
config.setStatisticsEnabled(true);
...

Cache myCache = cacheManager.createCache(CACHE_NAME, config);

然后，您可以使用以下方法找到MXBean注册静态变量：

Then you could find register statics MXBean using the following method:

public static CacheStatisticsMXBean getCacheStatisticsMXBean(final String cacheName) {
        final MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
        ObjectName name = null;
        try {
            name = new ObjectName("*:type=CacheStatistics,*,Cache=" + cacheName);
        } catch (MalformedObjectNameException ex) {
            LOG.error("Someting wrong with ObjectName {}", ex);
        }
        Set<ObjectName> beans = mbeanServer.queryNames(name, null);
        if (beans.isEmpty()) {
            LOG.debug("Cache Statistics Bean not found");
            return null;
        }
        ObjectName[] objArray = beans.toArray(new ObjectName[beans.size()]);
        return JMX.newMBeanProxy(mbeanServer, objArray[0], CacheStatisticsMXBean.class);
    }

如果找到，请享受您的统计信息：

And if it is found enjoy your statistics:

CacheStatisticsMXBean CacheStatBean = getCacheStatisticsMXBean(cacheName);
            if (CacheStatBean != null) {
                LOG.debug("Cache hits #{} misses #{}", CacheStatBean.getCacheHits(), CacheStatBean.getCacheMisses());
                LOG.debug("Cache hits %{} misses %{}", CacheStatBean.getCacheHitPercentage(),
                        CacheStatBean.getCacheMissPercentage());
                LOG.debug("Cache gets #{}", CacheStatBean.getCacheGets());
                LOG.debug("Cache evictions #{}", CacheStatBean.getCacheEvictions());
                LOG.debug("Cache average get time {} milliseconds", CacheStatBean.getAverageGetTime());
            }

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