In Ehcache 3.0.0, How to get the live statistics data ?

[lith...@gmail.com]

Environment:  Ehcache 3.0.0 / Java8.  (moving from Ehcache 2.x.x)

We had following implementation in our product for reporting live statistics data:

  //get statistics data since Ehcache 2.4.1 

  cache.setSampledStatisticsEnabled(true);

  cache.setStatisticsAccuracy(Statistics.STATISTICS_ACCURACY_NONE);

  LiveCacheStatistics stat = cache.getLiveCacheStatistics();

  // with 'stat' object, we can print/report all of following data

  log.info( stat.getCacheHitCount() );

  log.info( stat.getInMemoryHitCount() );

  log.info( stat.getOffHeapHitCount() );

  log.info( stat.getOnDiskHitCount() );

  log.info( stat.getCacheMissCount() );

  log.info( stat.getInMemoryMissCount() );

  log.info( stat.getOffHeapMissCount() );

  log.info( stat.getOnDiskMissCount() );

  log.info( stat.getSize() );

  log.info( stat.getInMemorySize() );

  log.info( stat.getOffHeapSize() );

  log.info( stat.getAverageSearchTime() );

Now I tried to find the counterpart in Ehcache 3.0.0 but couldn't figure it out.  I tried to google the solution but cannot find the sample code.

Can anyone give me some hints here?

Thanks in advance.

[Louis Jacomet]

Hi,

Ehcache 3.0 does not have a public statistic API.

If used through the javax.caching bridge (JSR-107), there is something defined through an MBean.

We took the decision of not having a public API in the first version as we were not sure what we would want to expose through it.

Regards,

Louis

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[lith...@gmail.com]

I see. 

Thanks Louis!

[Louis Jacomet]

Yes, that is correct. In order to get MBeans registered, you have to use JSR-107 and configure it properly - see methods on CompleteConfiguration.

On Thu, Apr 28, 2016 at 7:09 PM <lith...@gmail.com> wrote:

Using ehcache 2.x, I was able to browse MBean of 'net.sf.ehcache':

  'net.sf.ehcache'
    -> 'SampledCache'

      -> 'myCache'  

    -> 'SampledCacheManager'

      -> 'myCacheManager'

  

but switched to ehcache 3.0.0, I don't see 'org.ehcache' showing in my MBean browser.

For viewing those statistics data through a MBean, I have to use 'javax.cache' bridge way in my coding (change code to use JSR107's date types)?

Thanks in advance.

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[wilming...@gmail.com]

+1 for bringing back Statistics.  I'd like to use ehcache 3.0 because it has the functionality to specify the heap size with memory settings and not just number of entries.  I don't think it's possible to use this and JSR-107 concurrently, correct?  Thanks!

[Louis Jacomet]

Hi,

What kind of stats would you really need? Is the JSR-107 list comprehensive enough?

Regarding using byte sized in a JSR-107 context, you will have to resort to provider specific configuration but this is certainly possible.

See http://www.ehcache.org/documentation/3.0/107.html#jsr-107-and-ehcache-configuration-integration for the different options.

Regards,

Louis

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[wilming...@gmail.com]

I basically want enough information so I can build graphs to display to an admin.  It would basically show how much of the allocated memory is being used in the cache.  I've switched my code over to use the javax.cache.Cache and javax.cache.CacheManager object but still use the underlying ehcache configuration.  Is it possible to still persist data to disk using this method?  Normally I would use the CacheManagerBuilder to specify a persistent cache (giving it a directory location) when creating an ehcache CacheManager.

[Louis Jacomet]

You can certainly use Ehcache configuration for setting up javax.cache CacheManager and Cache.

Have a look at http://www.ehcache.org/documentation/3.0/107.html#jsr-107-and-ehcache-configuration-integration to discover the different ways to do that.

Regards,

Louis

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[Gabriel Magniez]

Hi,

I have the same issue, I'm trying an offheap cache but it is very hard to size it as there id no way to see the occupied size, the jvm reports that all the direct buffers are used

[wilming...@gmail.com]

Thanks for the info.  I have my code switched to use the javax cache with Ehcache as the underlying cache.  What's the best mechanism to get to the statistics from there?