PerTxBox.java

/*
 * JVSTM: a Java library for Software Transactional Memory
 * Copyright (C) 2005 INESC-ID Software Engineering Group
 * http://www.esw.inesc-id.pt
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Author's contact:
 * INESC-ID Software Engineering Group
 * Rua Alves Redol 9
 * 1000 - 029 Lisboa
 * Portugal
 */
package jvstm;

public class PerTxBox<E> {
    private final E initial;

    public PerTxBox(E initial) {
        this.initial = initial;
    }

    public E get() {
        Transaction tx = Transaction.current();
        if (tx == null) {
            tx = Transaction.begin();
            E result = tx.getPerTxValue(this, initial);
            tx.commit();
            return result;
        } else {
            return tx.getPerTxValue(this, initial);
        }
    }

    public void put(E newE) {
        Transaction tx = Transaction.current();
        if (tx == null) {
            tx = Transaction.begin();
            tx.setPerTxValue(this, newE);
            tx.commit();
        } else {
            tx.setPerTxValue(this, newE);
        }
    }

    public void commit(E value) {
    }
}