动态修改长事务配置的MBean支持

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@882 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/pool/DruidAbstractDataSource.java

@@ -203,6 +203,10 @@ public abstract class DruidAbstractDataSource extends WrapperAdapter implements
     public long[] getTransactionHistogramValues() {
         return transactionHistogram.toArray();
     }
+    
+    public long[] getTransactionHistogramRanges() {
+        return transactionHistogram.getRanges();
+    }
 
     public long getCommitCount() {
         return commitCount.get();