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--- caching:ex3 [2007/02/26 18:37] – created bdefrain
+++ caching:ex3 [2021/02/05 13:51] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Caching: Invalidate (part I) ======
+[[caching:intro|Intro]]
+[[caching:ex1|Ex1]]
+[[caching:ex2|Ex2]]
+[[caching:ex3|Ex3]]
+[[caching:ex4|Ex4]]====== Caching: Invalidate (part I) ======
 **Task:** Pass ''tests.Invalidation1''.
-While caching in this way does save computation, it will lead to incorrect bounding boxes if a ''Group'' is ever moved. Write another aspect that invalidates (i.e. clears) the cache whenever the ''move()'' method of ''Group'' is called.
+While caching in this way does save computation, it will lead to incorrect bounding boxes if a ''Group'' is ever moved. Write another **separate** aspect that invalidates (i.e. clears) the cache whenever the ''move()'' method of ''Group'' is called.
 <note tip>
-Employ an additional ''before'' advice.
+Employ an additional ''before'' advice. The original aspect that manages the cached data should provide functionality to clear the cache.
+To reach the aspect instance, you might need to use the [[http://www.eclipse.org/aspectj/doc/released/progguide/semantics-aspects.html#aspect-instantiation|aspectOf]] method.
 </note>
@@ Line 13: / Line 19: @@
 ----
-Remove the invalidation aspect from the build path and continue with [[caching:ex3|Exercise 3]].
+Remove the invalidation aspect from the build path and continue with [[caching:ex4|Exercise 4]].