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From "Pinaki Poddar (JIRA)" <>
Subject [jira] Commented: (OPENJPA-1153) Test suite speed-up outside SingleEMFTestCase
Date Mon, 14 Sep 2009 15:08:57 GMT


Pinaki Poddar commented on OPENJPA-1153:

Thanks Milosz for raising this issue. The current usage of SingleEMFTestCase is a misnomer
-- we essentially create a new EMF on every test method of every test. In Criteria tests we
had used a different scheme where a single EMF instance is used for all test cases that are
using the same set of domain entities. The performance speed up with this strategy is remarkable.

Further improvement is possible with a smarter scheme that can determine whether to reuse
or create EMF based on the domain entities used by a test. Currently without that automatic
decision, we just partitioned the Criteria tests into 3-4 buckets -- where all the tests in
a bucket tests work with the same set of domain entities. 

> Test suite speed-up outside SingleEMFTestCase
> ---------------------------------------------
>                 Key: OPENJPA-1153
>                 URL:
>             Project: OpenJPA
>          Issue Type: Test
>    Affects Versions: 1.1.0, 1.2.1
>            Reporter: Milosz Tylenda
>            Assignee: Milosz Tylenda
>            Priority: Minor
>             Fix For: 2.0.0
> From the developer list [1]:
> We have groups of tests which do not inherit from SingleEMFTestCase and use common persistence.xml
files to do their setUp()s. Each persistence.xml contains all entities used by the group.
An individual test uses its group's persistence.xml to set itself up although the test usually
uses one or two entities. Not surprisingly getting database metadata and issuing DELETE TABLE
statements often takes much more time than the actual test itself.
> The most notable example is a group of tests located in openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/kernel/.
Their openjpa-persistence-jdbc/src/test/resources/org/apache/openjpa/persistence/kernel/common/apps/META-INF/persistence.xml
contains almost 100 entities. I measured how long does it take to run TestDateQueries which
uses only one entity but sets itself up with that persistence xml. I ran the test suite with
-Dtest=TestDateQueries and the necessary tables were already in the database:
> - Derby: 20 secs
> - MySQL: 12 secs
> - PostgreSQL: 46 secs
> Then I modified the persistence.xml to include only the entity used by the test. The
timings for all databases dropped to around 4 seconds.
> My idea is to modify these tests (at least the ones taking the most time) and their superclass(-es)
to not use persistence.xml but specify used entities as setUp() parameters, similarly to what
SingleEMFTestCase. It looks like we would save at least a few minutes on a test suite run.

> [1]

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