org.hibernate.dialect.lock.AbstractSelectLockingStrategy Maven / Gradle / Ivy
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2010, Red Hat Inc. or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.dialect.lock;
import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.persister.entity.Lockable;
/**
* Base {@link LockingStrategy} implementation to support implementations
* based on issuing SQL SELECT statements
*
* @author Steve Ebersole
*/
public abstract class AbstractSelectLockingStrategy implements LockingStrategy {
private final Lockable lockable;
private final LockMode lockMode;
private final String waitForeverSql;
protected AbstractSelectLockingStrategy(Lockable lockable, LockMode lockMode) {
this.lockable = lockable;
this.lockMode = lockMode;
this.waitForeverSql = generateLockString( LockOptions.WAIT_FOREVER );
}
protected Lockable getLockable() {
return lockable;
}
protected LockMode getLockMode() {
return lockMode;
}
protected abstract String generateLockString(int lockTimeout);
protected String determineSql(int timeout) {
return timeout == LockOptions.WAIT_FOREVER
? waitForeverSql
: timeout == LockOptions.NO_WAIT
? getNoWaitSql()
: generateLockString( timeout );
}
private String noWaitSql;
public String getNoWaitSql() {
if ( noWaitSql == null ) {
noWaitSql = generateLockString( LockOptions.NO_WAIT );
}
return noWaitSql;
}
}