Added methods for creating an interval that execute a Runnable when they

expire. Whoa, composable software. Amazing. We should have done this eight
years ago.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@2595 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/java/com/samskivert/util/Interval.java

@@ -46,6 +46,34 @@ public abstract class Interval
         public Interval getInterval ();
     }
 
+    /**
+     * Creates an interval that executes the supplied runnable when it expires.
+     */
+    public static Interval create (final Runnable onExpired)
+    {
+        return new Interval() {
+            public void expired () {
+                onExpired.run();
+            }
+        };
+    }
+
+    /**
+     * Creates an interval that executes the supplied runnable on the specified RunQueue when it
+     * expires.
+     */
+    public static Interval create (RunQueue runQueue, final Runnable onExpired)
+    {
+        // we could probably avoid all the wacky machinations internal to Interval that do the
+        // runbuddy reposting and whatever and just create a non-runqueue interval that posts the
+        // supplied runnable to the runqueue when it expires, but we'll just punt on that for now
+        return new Interval(runQueue) {
+            public void expired () {
+                onExpired.run();
+            }
+        };
+    }
+
     /**
      * This may be removed.
      *