001    package org.apache.ojb.otm.lock.isolation;
002    
003    /* Copyright 2003-2005 The Apache Software Foundation
004     *
005     * Licensed under the Apache License, Version 2.0 (the "License");
006     * you may not use this file except in compliance with the License.
007     * You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    import org.apache.ojb.otm.core.Transaction;
019    import org.apache.ojb.otm.lock.LockingException;
020    import org.apache.ojb.otm.lock.ObjectLock;
021    
022    public class ReadUncommittedIsolation extends AbstractIsolation
023    {
024    
025        /**
026         * @see org.apache.ojb.otm.lock.TransactionIsolation#lockForRead(Transaction, ObjectLocks)
027         */
028        public void readLock(Transaction tx, ObjectLock lock)
029        {
030            // Read locks are always granted
031            lock.readLock(tx);
032        }
033    
034        /**
035         * @see org.apache.ojb.otm.lock.TransactionIsolation#lockForWrite(Transaction, ObjectLocks)
036         */
037        public void writeLock(Transaction tx, ObjectLock lock)
038            throws LockingException
039        {
040            // WriteLock will wait for an existing write lock to be released before it locks
041            // it for this transaction
042            lock.writeLock(tx);
043        }
044    
045    }