API: Make it possible to use pre-instantiated Java-based migrations

Hi,

as we are using Spring with Flyway we want to use other beans inside the SpringJdbcMigrations. Therefore we created a new resolver which retrieves the SpringJdbcMigrations from the Spring application context. This way we are able to define the migrations inside the application context and reference other beans we would need for this migration inside the SpringJdbcMigraiton with the dependency injection mechanisms of Spring (@Autowired). Please have a look at the linked pull request and the tests how this is done.

If this pull request is accepted and integrated, then I would also add some documentation to the website project of Flyway on how to use this new resolver.

Thanks and regards,

Guy

[simonzhong1985]

Sry I forgot to mention our configuration:

@Configuration
class FlywayConfiguration {
    @Primary
    @Bean(name = "flywayInitializer")
    @DependsOn("springUtility") //or whatever your ApplicationContextAware is named
    FlywayMigrationInitializer flywayMigrationInitializer(){
      //your flyway init configuration...
    }
}

The trick here is to force FlywayMigrationInitializer to get instantiated after the ApplicationContextAware workaround

This has now been implemented generically using a new javaMigrations property in the API.

Spring users can use this to automatically use all JavaMigration Spring beans with Flyway:

import org.flywaydb.core.Flyway;
import org.flywaydb.core.api.migration.JavaMigration;
import org.springframework.context.ApplicationContext;

...
ApplicationContext applicationContext = ...; // obtain a reference to Spring's ApplicationContext.

Flyway flyway = Flyway.configure()
    .dataSource(url, user, password)
    // Add all Spring-instantiated JavaMigration beans
    .javaMigrations(applicationContext.getBeansOfType(JavaMigration.class).values().toArray(new JavaMigration[0]))
    .load();
flyway.migrate();

@axelfontaine Could you help to provide one example to show how to inject spring bean into class implementation of JavaMigration interface?

Thanks, Simon

[axelfontaine]

This has now been implemented generically using a new javaMigrations property in the API.

Spring users can use this to automatically use all JavaMigration Spring beans with Flyway:

import org.flywaydb.core.Flyway;
import org.flywaydb.core.api.migration.JavaMigration;
import org.springframework.context.ApplicationContext;

...
ApplicationContext applicationContext = ...; // obtain a reference to Spring's ApplicationContext.

Flyway flyway = Flyway.configure()
    .dataSource(url, user, password)
    // Add all Spring-instantiated JavaMigration beans
    .javaMigrations(applicationContext.getBeansOfType(JavaMigration.class).values().toArray(new JavaMigration[0]))
    .load();
flyway.migrate();