Question

Wandering through ScalaQuery source code I’ve found such declarations (many of the kind actually):

private[session] val dyn = new DynamicVariable[Session](null)

and

def forDataSource(ds: DataSource): Database = new Database {
  protected[session] def createConnection(): Connection = ds.getConnection
}

What does that [session] mean? And I thought a function defined inside a function can not be protected…

Answer 1

But createConnection is not inside forDataSource, it’s inside Database — see the new Database { on the previous line?

It means that everything in the scope session (which might be a class, object or package — I don’t know) can see that definition, plus the classes that extend Database.