Synchronize FutureSPFResult.isReady() to avoid race-conditions. See JSPF-93

git-svn-id: https://svn.apache.org/repos/asf/james/jspf/trunk@1169740 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/resolver/src/main/java/org/apache/james/jspf/executor/FutureSPFResult.java b/resolver/src/main/java/org/apache/james/jspf/executor/FutureSPFResult.java
index 2eb336e..687d6be 100644
--- a/resolver/src/main/java/org/apache/james/jspf/executor/FutureSPFResult.java
+++ b/resolver/src/main/java/org/apache/james/jspf/executor/FutureSPFResult.java
@@ -105,7 +105,7 @@
      * 

      * @return true or false

      */

-    public boolean isReady() {

+    public synchronized boolean isReady() {

         return isReady;

     }

 }