| // Copyright 2010 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.server; |
| |
| |
| /** Base implementation any generated schema must implement. */ |
| public abstract class AbstractSchema implements Schema { |
| @Override |
| public void commit() throws OrmException { |
| // Do nothign by default. |
| } |
| |
| @Override |
| public void rollback() throws OrmException { |
| // Do nothign by default. |
| } |
| |
| /** |
| * Obtain the next unique value from a pool of available numbers. |
| * <p> |
| * Frequently the next number will be just an increment of a global counter, |
| * but may be spread across multiple counter ranges to increase concurrency. |
| * |
| * @param poolName unique name of the counter within the schema. The |
| * underlying storage system should use this to identify the counter |
| * pool to obtain the next value from. |
| * @return a new unique value. |
| * @throws OrmException a value cannot be reserved for the caller, or the pool |
| * has been exhausted and no new values are available. |
| */ |
| protected abstract long nextLong(String poolName) throws OrmException; |
| } |