Explain this concurrent scala code

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I have found this code example, that is part of a "web crawler" written in Scala:

 def getPageSizeConcurrently() = {
        val caller = self
 
        for (url <- urls) {
            actor { caller ! (url, PageLoader.getPageSize(url)) }
        }
 
        for (i <- 1 to urls.size) {
            receive {
                case (url, size) =>
                    println(url + ": " + size)
                case _ =>
                    println("Shouldn't happen")
            }
        }
    } 

I want to know if I am getting it right.

The second line "var caller = self" is that something equal to erlangs self(), which is returning a PID?

The fifth line that starts with actor, is that creating a new actor-process that is sending a message to the PID caller with a tupel (url, PageLoader.getPageSize(url))?

asked 41 secs ago

theva

115