Defining an alternate connection pool in Grails 2.3.6 - grails

Question

I know that, at some point between Grails 1.X and Grails 2.X, the default connection pooling library changed from commons-dbcp to tomcat-dbcp.
Now, I'm trying to configure either BoneCP or HikariCP as the connection pooling library for my Grails application.
However, I see that this answer offers a solution which might only apply to Grails 1.X.
I also found this Gist, but again, I don't know which Grails version it applies to.
So, is it possible to define a custom connection pool inside a Grails 2.3.6 application? Thanks!

Answer 1

UPDATE: OK so you actually need to tell Grails not to pool the datasources, since HikariCP is now taking care of this.
I saw connection weirdness in my apps if I left that switch on. So instead say:
pooled = false
OK yeah, #Joshua Moore is right.
I tried doing it with updated Grails methods and this is the relevant section of my resources.groovy file. As far as I can understand, the configuration values in Datasource.groovy are pulled into resources.groovy at runtime, after the target runtime environment has been identified (development, test or production).
def config = Holders.config
def dataSources = config.findAll {
it.key.toString().contains("dataSource_")
}
dataSources.each { key, value ->
def ds = value
"${key}"(HikariDataSource, { bean ->
def hp = new Properties()
hp.username = ds.username
hp.password = ds.password
hp.connectionTimeout = 6000
hp.maximumPoolSize = 60
hp.jdbcUrl = ds.url
hp.driverClassName = ds.driverClassName
HikariConfig hc = new HikariConfig(hp)
bean.constructorArgs = [hc]
})
}
And this is the relevant section of my DataSource.groovy configuration:
// environment specific settings
environments {
development {
dataSource_myapp1 {
pooled = false
username = "CONFIGURE_ME_EXTERNALLY"
password = "CONFIGURE_ME_EXTERNALLY"
driverClassName = 'oracle.jdbc.OracleDriver'
dialect = 'org.hibernate.dialect.Oracle10gDialect'
url = 'jdbc:oracle:thin:#MYDBHOST1:1521/MYSERVICEID1'
}
dataSource_myApp2 {
pooled = false
username = "CONFIGURE_ME_EXTERNALLY"
password = "CONFIGURE_ME_EXTERNALLY"
driverClassName = 'oracle.jdbc.OracleDriver'
dialect = 'org.hibernate.dialect.Oracle10gDialect'
url = 'jdbc:oracle:thin:#MYDBHOST2:1521/MYSERVICEID2'
}
}
}
In my case, it's pretty much the same for test and production environments. Thanks!