package Ġcom . st as bar . app . database ĊĊ Ċ class ĠPostgres Database ( pool Size : ĠInt , Ġjdbc Connection Url : ĠString , Ġusername : ĠString , Ġpassword : ĠString ) Ġ: ĊĠ ĠDatabase Impl ( pool Size , Ġ" org . postgresql . Driver ", Ġjdbc Connection Url , Ġusername , Ġpassword ) Ċ