Reading application properties

[wodzuu]

Hi,

I have thought about creating some mechanism to simplify access to application properties inside classes extending FunctionalConfiguration. Therefore I have created PropertiesResolver trait that introduces variable $ which can be used to access them in two ways: $("my.property.name") or $.my.property.name. This does not define properties source in any way, but just creates simple mechanism of accessing them.

Sample usage:

class Config extends FunctionalConfiguration with PropertiesResolver {
  bean("propertiesConfig") {
    new PropertyPlaceholderConfigurer { ...}
  }

  val dataSource = bean("dataSource") {
    val dataSource = new BasicDataSource()
    dataSource.setDriverClassName($.database.driver.class)
    dataSource.setUrl($.database.url)
    dataSource.setUsername($.database.username)
    dataSource
  } destroy {
    _.close()
  }
}

I have also created another trait PropertiesAware that, when extended by any bean, gives it access to properties the same way:

class SomeBean extends PropertiesAware {
  lazy val version:String = $.app.version
  lazy val revision:Int = $.app.revision.toInt
  lazy val debugMode:Boolean = $.debug.toBoolean
}

For those more used to referencing properties by String $("app.version") is also available and of course good old @Value("${app.version}") works too.

Let me know what do you think.