ha support

src/main/java/com/alibaba/druid/pool/ha/DataSourceHolder.java

@@ -21,7 +21,7 @@ public class DataSourceHolder implements Closeable {
         this.dataSource = dataSource;
     }
 
-    public void resetStat() {
+    public void resetState() {
         connectCount.set(0);
     }
 
@@ -66,4 +66,8 @@ public class DataSourceHolder implements Closeable {
     public void close() {
         dataSource.close();
     }
+    
+    public void restart() {
+        dataSource.resetStat();
+    }
 }