| // Copyright 2008 Google Inc. |
| // |
| // Licensed 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 com.google.gwtorm.client; |
| |
| import java.lang.annotation.ElementType; |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.lang.annotation.Target; |
| |
| /** |
| * Annotation marking a field as the row version used for optimistic locking. |
| * |
| * <p>Fields marked with <code>RowVersion</code> must also be marked with {@link Column} and must be |
| * of type <code>int</code>. The field will be automatically incremented during INSERT and UPDATE |
| * operations, and will be tested during UPDATE and DELETE operations. Concurrent modifications of |
| * the same entity fail as the row version won't match. |
| * |
| * <p>At most one RowVersion annotation should appear in any entity. |
| */ |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target(ElementType.FIELD) |
| public @interface RowVersion {} |