typing up the more real world actor example

scala/sizer.scala

@@ -0,0 +1,44 @@
+import scala.io._
+import scala.actors._
+import Actor._
+
+object PageLoader {
+  def getPageSize(url : String) = Source.fromURL(url).mkString.length
+}
+
+val urls = List("http://twitter.com",
+                "http://amazon.com",
+                "http://themeforest.net")
+
+def timeMethod(method: () => Unit) = {
+  val start = System.nanoTime
+  method()
+  val end = System.nanoTime
+  println("Mthod took " + (end - start)/1000000000.0 + "seconds.")
+}
+
+def getPageSizeSequentially() = {
+  for(url <- urls) {
+    println("Size for " + url + ": " + PageLoader.getPageSize(url))
+  }
+}
+
+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("Size for " + url + ": " + size)
+    }
+  }
+}
+
+println("Sequential")
+timeMethod { getPageSizeSequentially }
+println("Concurrent")
+timeMethod { getPageSizeConcurrently }
+