QPID-3270 A new enumeration is created off a static list for each

invocation of asEnumeration().

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1138296 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 15 insertions, 14 deletions

diff --git a/qpid/java/client/src/main/java/org/apache/qpid/client/CustomJMSXProperty.java b/qpid/java/client/src/main/java/org/apache/qpid/client/CustomJMSXProperty.java
index 7cc548915c..e81e754da2 100644
--- a/qpid/java/client/src/main/java/org/apache/qpid/client/CustomJMSXProperty.java
+++ b/qpid/java/client/src/main/java/org/apache/qpid/client/CustomJMSXProperty.java
@@ -23,6 +23,7 @@ package org.apache.qpid.client;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Enumeration;
+import java.util.List;
 
 import org.apache.qpid.framing.AMQShortString;
 
@@ -34,6 +35,18 @@ public enum CustomJMSXProperty
     JMSXGroupSeq,
     JMSXUserID;
 
+    private static List<String> _names;
+
+    static
+    {
+        CustomJMSXProperty[] properties = values();
+        _names = new ArrayList<String>(properties.length);
+        for(CustomJMSXProperty property :  properties)
+        {
+            _names.add(property.toString());
+        }
+
+    }
 
     private final AMQShortString _nameAsShortString;
 
@@ -47,20 +60,8 @@ public enum CustomJMSXProperty
         return _nameAsShortString;
     }
 
-    private static Enumeration _names;
-
-    public static synchronized Enumeration asEnumeration()
+    public static Enumeration asEnumeration()
     {
-        if(_names == null)
-        {
-            CustomJMSXProperty[] properties = values();
-            ArrayList<String> nameList = new ArrayList<String>(properties.length);
-            for(CustomJMSXProperty property :  properties)
-            {
-                nameList.add(property.toString());
-            }
-            _names = Collections.enumeration(nameList);
-        }
-        return _names;    
+        return Collections.enumeration(_names);
     }
 }