QPID-1800: only create the new empty arraylist after checking for a previous enqueue list, as it often wont be required

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@764113 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 5 insertions, 2 deletions

diff --git a/java/broker/src/main/java/org/apache/qpid/server/transactionlog/BaseTransactionLog.java b/java/broker/src/main/java/org/apache/qpid/server/transactionlog/BaseTransactionLog.java
index 6af39e3d1b..9c8cad4240 100644
--- a/java/broker/src/main/java/org/apache/qpid/server/transactionlog/BaseTransactionLog.java
+++ b/java/broker/src/main/java/org/apache/qpid/server/transactionlog/BaseTransactionLog.java
@@ -68,13 +68,16 @@ public class BaseTransactionLog implements TransactionLog
                 _logger.info("Recording Enqueue of (" + messageId + ") on queue:" + queues);
             }
             
-            //list to hold which new queues to enqueue the message on
-            ArrayList<AMQQueue> toEnqueueList = new ArrayList<AMQQueue>();
+            //variable to hold which new queues to enqueue the message on
+            ArrayList<AMQQueue> toEnqueueList = null;
             
             List<AMQQueue> enqueuedList = _idToQueues.get(messageId);
             if (enqueuedList != null)
             {
                 //There are previous enqueues for this messageId
+                //create new empty list to hold additions
+                toEnqueueList = new ArrayList<AMQQueue>();
+                
                 synchronized (enqueuedList)
                 {
                     for(AMQQueue queue : queues)