Integration of Flyway into JPA + OSGi - jpa

Question

in my current project I have integrated JPA into OSGi standalone application. For integration I have taken following OSGi specification Implementations:
OSGi R7 Platform (Equinox 3.13.0)
JPA 2.2 (Eclipselink 2.7.1)
JPA Container
Apache Aries JPA Container 2.7.0
Apache Aries JPA Eclipselink adapter 2.7.0
JDBC Service (PAX JDBC MariaDB 1.3.0)
This integration works perfect.
The next step to go - Flyway integration. The DB Migration Scripts should be packed directly into Persistence Bundle. Now I would like to trigger the migration exactly when DataSource is created, immediately before EntityManagerFactory and EntityManagerFactoryBuilder Services will be Registerd. At this moment I should have access to Persistence Bundle class loader and i should have an initialized Datasource. The only solution, that I have found, is to refactor Apache Areas JPA Container and put a Flyway migration call into AriesEntityManagerFactoryBuilder.dataSourceReady. The Flyway trigger is stored as locations in JPA properties like this:
<property name="org.flywaydb.Locations" value="classpath:com/hrrm/budget/domain/account/migrations"/>
This solution is correct placed at a perfect time to call. But it is not confirm with OSGi JPA Service Specification 1.1 and was implemented as a hook into Apache Aries JPA Container.
Is there another more perfect and specification-confirm solution to integrate Flyway into my project?

Answer 1

To hook into the DataSource creation you can use a PreHook service like described in the pax-jdbc docs.
You can find an example here.
#Component(property="name=persondb")
public class Migrator implements PreHook {
public void prepare(DataSource ds) throws SQLException {
// Put your migration calls here
}
}