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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
* "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.openjpa.jdbc.kernel;
import java.sql.SQLException;
import java.util.List;
import org.apache.openjpa.jdbc.identifier.DBIdentifier;
import org.apache.openjpa.jdbc.meta.ClassMapping;
import org.apache.openjpa.jdbc.meta.FieldMapping;
import org.apache.openjpa.jdbc.sql.DBDictionary;
import org.apache.openjpa.jdbc.sql.SQLBuffer;
import org.apache.openjpa.jdbc.sql.SQLExceptions;
import org.apache.openjpa.jdbc.sql.SQLFactory;
import org.apache.openjpa.jdbc.sql.Select;
import org.apache.openjpa.kernel.MixedLockLevels;
import org.apache.openjpa.kernel.OpenJPAStateManager;
import org.apache.openjpa.lib.util.Localizer;
import org.apache.openjpa.util.OptimisticException;
/**
* Mixed lock manager implements both optimistic and pessimistic locking
* semantics in parallel to the JPA 2.0 specification.
*
* @author Albert Lee
* @since 2.0.0
*/
public class MixedLockManager extends PessimisticLockManager {
private static final Localizer _loc = Localizer
.forPackage(MixedLockManager.class);
/*
* (non-Javadoc)
* @see org.apache.openjpa.jdbc.kernel.PessimisticLockManager
* #selectForUpdate(org.apache.openjpa.jdbc.sql.Select,int)
*/
public boolean selectForUpdate(Select sel, int lockLevel) {
return (lockLevel >= MixedLockLevels.LOCK_PESSIMISTIC_READ)
? super.selectForUpdate(sel, lockLevel) : false;
}
/*
* (non-Javadoc)
* @see org.apache.openjpa.jdbc.kernel.PessimisticLockManager#
* lockInternal(org.apache.openjpa.kernel.OpenJPAStateManager, int, int,
* java.lang.Object)
*/
protected void lockInternal(OpenJPAStateManager sm, int level, int timeout,
Object sdata, boolean postLockVersionCheck) {
if (level >= MixedLockLevels.LOCK_PESSIMISTIC_FORCE_INCREMENT) {
setVersionCheckOnReadLock(true);
setVersionUpdateOnWriteLock(true);
super.lockInternal(sm, level, timeout, sdata, postLockVersionCheck);
} else if (level >= MixedLockLevels.LOCK_PESSIMISTIC_READ) {
setVersionCheckOnReadLock(true);
setVersionUpdateOnWriteLock(false);
super.lockInternal(sm, level, timeout, sdata, postLockVersionCheck);
} else if (level >= MixedLockLevels.LOCK_READ) {
setVersionCheckOnReadLock(true);
setVersionUpdateOnWriteLock(true);
optimisticLockInternal(sm, level, timeout, sdata,
postLockVersionCheck);
}
}
protected List getLockRows(DBDictionary dict, Object id, ClassMapping mapping,
JDBCFetchConfiguration fetch, SQLFactory factory) {
List sqls = super.getLockRows(dict, id, mapping, fetch, factory);
//
if(!dict.supportsLockingWithMultipleTables) {
// look for columns mapped to secondary tables which need to be locked
FieldMapping fms[] = mapping.getFieldMappings();
for( FieldMapping fm : fms) {
DBIdentifier secTableName = fm.getMappingInfo().getTableIdentifier();
if (!DBIdentifier.isNull(secTableName)) {
// select only the PK columns, since we just want to lock
Select select = factory.newSelect();
select.select(fm.getColumns());
select.whereForeignKey(fm.getJoinForeignKey(), id, mapping, _store);
sqls.add(select.toSelect(true, fetch));
}
}
}
return sqls;
}
protected void optimisticLockInternal(OpenJPAStateManager sm, int level,
int timeout, Object sdata, boolean postLockVersionCheck) {
super.optimisticLockInternal(sm, level, timeout, sdata,
postLockVersionCheck);
if (postLockVersionCheck) {
if (level >= MixedLockLevels.LOCK_PESSIMISTIC_READ) {
ClassMapping mapping = (ClassMapping) sm.getMetaData();
try {
if (!mapping.getVersion().checkVersion(sm, this.getStore(),
false)) {
throw (new OptimisticException(_loc.get(
"optimistic-violation-lock").getMessage()))
.setFailedObject(sm.getObjectId());
}
} catch (SQLException se) {
throw SQLExceptions.getStore(se, sm.getObjectId(),
getStore().getDBDictionary());
}
}
}
}
public boolean skipRelationFieldLock() {
return true;
}
}
