Annyce Davis

Helping you write beautiful code

Updated: Mocking Hibernate Create Criteria in Grails’ Unit Test with GMock

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Using the GMock Library I have updated my unit tests to mock out the create criteria methods the following way: 

void testSomeFunction() {
    def results = []

    def mockCriteria = mock() {
      list(instanceOf(Closure)).returns(results)
    }

    mock(Book).static.createCriteria().returns(mockCriteria)

    play {
      assertEquals null, bookService.getDefaultBook(null)
    }
  }

You need to add the following to the top of the unit test file with the import statements:

import org.gmock.*
import static org.hamcrest.Matchers.*

@WithGMock

Also add the following to your BuildConfig.groovy:

dependencies {
    test "org.gmock:gmock:0.8.0"
    test "org.hamcrest:hamcrest-all:1.0"
}

I learned this from the following blog post: http://adhockery.blogspot.com/2010/01/using-gmock-to-complement-grails.html

Monitor Hibernate Cache Statistics in Grails Application v2

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In an earlier post I wrote about monitoring your cache hits in a Grails Application using a programmatic approach, this time I will show you how to use jconsole and have it done for you automatically.

All you need to do is start your Grails Application: grails run-app. Then start jconsole and choose your running Grails’ process. Go over to the MBeans tab and navigate to the area of your application server where you can see the cache.

What I really love about this is that you can perform actions in your application and watch the cache hits over time.

Monitor Hibernate Cache Statistics in Grails Application

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After going through the effort of adding cache:true all over your application to take advantage of the Hibernate caching you will want to monitor the results. In order to do so you only need to modify two files, DataSource.groovy and a desired Controller.

//In your DataSource.groovy
hibernate {
generate_statistics=true
}

//In your Controller
def sessionFactory

def showCacheStatistics = {
def statistics = sessionFactory.statistics
log.info(statistics)
render statistics
}

Here is the output of calling the showCacheStatistics method on your controller:
Statistics[start time=1269058393252,sessions opened=27,sessions closed=25,transactions=18,successful transactions=3,optimistic lock failures=0,flushes=21,connections obtained=15,statements prepared=219,statements closed=219,second level cache puts=45,second level cache hits=1,second level cache misses=0,entities loaded=40,entities updated=5,entities inserted=48,entities deleted=0,entities fetched=26,collections loaded=20,collections updated=0,collections removed=0,collections recreated=12,collections fetched=18,queries executed to database=93,query cache puts=6,query cache hits=8,query cache misses=6,max query time=89]

Currently I’m showing just a direct rendering of the statistics object, but you could specify which parameters are important to you and only show those, or perhaps send the data to a gsp file and have it formatted in some way.