1 files changed, 48 insertions, 0 deletions
diff --git a/das-java/tags/1.0-incubating-beta1-rc3/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/OptimisticWriteCommandImpl.java b/das-java/tags/1.0-incubating-beta1-rc3/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/OptimisticWriteCommandImpl.java
new file mode 100644
index 0000000000..0a5f6951e9
--- /dev/null
+++ b/das-java/tags/1.0-incubating-beta1-rc3/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/OptimisticWriteCommandImpl.java
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.das.rdb.impl;
+
+import java.sql.SQLException;
+
+import org.apache.tuscany.das.rdb.config.Update;
+import org.apache.tuscany.das.rdb.exception.OptimisticConcurrencyException;
+
+public class OptimisticWriteCommandImpl extends UpdateCommandImpl {
+
+    public OptimisticWriteCommandImpl(String sqlString) {
+        super(sqlString);
+    }
+
+    public OptimisticWriteCommandImpl(Update update) {
+        super(update);
+        addParameters(update.getParameters());
+    }
+
+    public void basicExecute() {
+        try {
+            int rowsAffected = statement.executeUpdate(parameters);
+            if (rowsAffected == 0) {
+                throw new OptimisticConcurrencyException("An update collision occurred");
+            }
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+}