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--- at:tutorial:appendix [2008/07/10 17:33] – added tvcutsem
+++ at:tutorial:appendix [2008/07/10 17:41] – added tvcutsem
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 ==== Miscellaneous ====
+The module ''/.at.support.util'' is a utility module grouping several miscellaneous tasks.
+=== Random Numbers ===
+The utility module defines functions for easily generating random numbers. Its implementation uses the random number generators from the underlying JVM. The following functions are the most useful:
+<code>
+// generate a random integer in the interval [min, max[
+def randomNumberBetween(min, max)
+// generate a random fraction in the interval [min, max[
+def randomFractionBetween(min, max)
+</code>
+=== Custom Object Serialization ===
+The method ''uponArrivalBecome:'' exported by the utility module creates a transporter object which can be used in ''pass'' meta-level methods to execute code upon deserialization. The closure passed to this function should return the object with which the transported object should be replaced. For example:
+<code>
+//inside a mirror
+def instancevar := ...;
+def pass() {
+  uponArrivalBecome: { |instancevar|
+    // return object to become here
+  }
+}
+</code>
+The function plays a role similar to ''readResolve'' in the Java object serialization framework.