transactionmanager.java

来自「resetful样式的ws样例,一种面向资源的webservices服务」· Java 代码 · 共 82 行

/*
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://jersey.dev.java.net/CDDL+GPL.html
 * or jersey/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at jersey/legal/LICENSE.txt.
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 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
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 * only the GPL Version 2, indicate your decision by adding "[Contributor]
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 * Version 2] license."  If you don't indicate a single choice of license, a
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package com.sun.jersey.samples.bookmark.util.tx;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.transaction.SystemException;
import javax.transaction.UserTransaction;
import javax.ws.rs.WebApplicationException;

/**
 *
 * @author Paul Sandoz
 */
public final class TransactionManager {
    
    public static void manage(Transactional t) {
        UserTransaction utx = getUtx();
        try {
            utx.begin();
            if (t.joinTransaction)
                t.em.joinTransaction();
            t.transact();
            utx.commit();
        } catch (Exception e) {
            try {
                utx.rollback();
            } catch (SystemException se) {
                throw new WebApplicationException(se);
            }
            throw new WebApplicationException(e);
        } finally {
            t.em.close();
        }
    }
    
    private static UserTransaction getUtx() {
        try {
            InitialContext ic = new InitialContext();
            return (UserTransaction)ic.
                    lookup("java:comp/UserTransaction");
        } catch (NamingException ne) {
            throw new WebApplicationException(ne);
        }
    }
}