org.apache.openjpa.jdbc.kernel.JDBCLockManager 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
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*/
package org.apache.openjpa.jdbc.kernel;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.LockManager;
import org.apache.openjpa.kernel.OpenJPAStateManager;
/**
* Extension of the {@link LockManager} interface with methods for
* datastore locking during the select and load process. Implementors of
* this interface can also take advantage of the fact that in the
* {@link LockManager#lock} and {@link LockManager#lockAll} methods, the
* given conn parameter, if any, will be an instance of
* {@link ConnectionInfo}.
*
* @author Abe White
*/
public interface JDBCLockManager
extends LockManager {
/**
* Return whether to issue the given select FOR UPDATE, depending on
* the capabilities of the dictionary and the fetch configuration.
*/
public boolean selectForUpdate(Select sel, int lockLevel);
/**
* Notification that the given instance was loaded via a result set
* produced by a FOR UPDATE select.
*/
public void loadedForUpdate(OpenJPAStateManager sm);
/**
* Return true if locking is not desired for relation fields.
*/
public boolean skipRelationFieldLock();
}