org.apache.openjpa.jdbc.meta.VersionStrategy Maven / Gradle / Ivy
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* 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
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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*/
package org.apache.openjpa.jdbc.meta;
import java.sql.SQLException;
import java.util.Map;
import org.apache.openjpa.jdbc.kernel.JDBCStore;
import org.apache.openjpa.jdbc.schema.Column;
import org.apache.openjpa.jdbc.sql.Result;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.kernel.StoreManager;
/**
* Handles optimistic lock versioning for a class.
*
* @author Abe White
*/
public interface VersionStrategy
extends Strategy {
/**
* Set the version that uses this strategy. This will be called before use.
*/
public void setVersion(Version owner);
/**
* Select the data for this indicator.
*
* @param mapping the known base class being selected; this may
* not be the base class in the inheritance hierarchy
* @return true if anything was selected; false otherwise
*/
public boolean select(Select sel, ClassMapping mapping);
/**
* Load data.
*/
public Object load(OpenJPAStateManager sm, JDBCStore store, Result res)
throws SQLException;
/**
* This method is called after data is loaded into the instance, in
* case the version indicator works off of a state image.
*/
public void afterLoad(OpenJPAStateManager sm, JDBCStore store);
/**
* Checks the version of the given state manager with the version
* stored in memory.
*
* @return true if the in-memory version was up-to-date, false otherwise
*/
public boolean checkVersion(OpenJPAStateManager sm, JDBCStore store,
boolean updateVersion)
throws SQLException;
/**
* @see StoreManager#compareVersion
*/
public int compareVersion(Object v1, Object v2);
/**
* @return a Map specifying how to update each version
* column during a bulk update.
*
* @since 1.0.0
*/
public Map getBulkUpdateValues();
}