--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/dancres/blitz/config/ReadAhead.java	Sat Mar 21 11:00:06 2009 +0000
@@ -0,0 +1,30 @@
+package org.dancres.blitz.config;
+
+/**
+ * <p>When Blitz encounters a template Entry created via snapshot() it will
+ * attempt a readahead from disk when there are no matches obtained from the
+ * cache. One can specify a global default readahead for all types using <code>
+ * entryReposReadahead</code> which can be overidden with individual
+ * <code>ReadAhead</code> <code>EntryConstraint</code>s.</p>
+ *
+ * <p>Specifying a readahead size of 0 disables readahead and is an enforced
+ * default for those Entry types tagged for FIFO operation.  Specifying any
+ * other positive value causes Blitz to fault in up to <code>readahead</code>
+ * Entry's from disk which are likely to match the <code>snapshot</code>'d
+ * template.</p>
+ *
+ * <p>Readahead is useful in cold start situations where the cache will be
+ * empty and also in cases where swapping occurs but Entry's are accessed in
+ * groups via a snapshot template.</p>
+ */
+public class ReadAhead implements EntryConstraint {
+    private int theSize;
+
+    public ReadAhead(int aSize) {
+        theSize = aSize;
+    }
+
+    public int getSize() {
+        return theSize;
+    }
+}