/*
 * 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
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package org.hibernate.dialect.lock;

import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.persister.entity.Lockable;

Base LockingStrategy implementation to support implementations based on issuing SQL SELECT statements
Author:Steve Ebersole
/** * Base {@link LockingStrategy} implementation to support implementations * based on issuing <tt>SQL</tt> <tt>SELECT</tt> 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) { if ( timeout == LockOptions.WAIT_FOREVER) { return waitForeverSql; } else if ( timeout == LockOptions.NO_WAIT) { return getNoWaitSql(); } else if ( timeout == LockOptions.SKIP_LOCKED) { return getSkipLockedSql(); } else { return generateLockString( timeout ); } } private String noWaitSql; protected String getNoWaitSql() { if ( noWaitSql == null ) { noWaitSql = generateLockString( LockOptions.NO_WAIT ); } return noWaitSql; } private String skipLockedSql; protected String getSkipLockedSql() { if ( skipLockedSql == null ) { skipLockedSql = generateLockString( LockOptions.SKIP_LOCKED ); } return skipLockedSql; } }