001/*
002 * (C) Copyright 2014 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Stephane Lacoin
018 */
019package org.nuxeo.ecm.core.storage.sql.jdbc;
020
021import java.lang.reflect.InvocationHandler;
022import java.lang.reflect.InvocationTargetException;
023import java.lang.reflect.Method;
024import java.lang.reflect.Proxy;
025
026import javax.transaction.Transaction;
027
028import org.nuxeo.ecm.core.storage.sql.Mapper;
029import org.nuxeo.runtime.transaction.TransactionHelper;
030
031public class JDBCMapperTxSuspender implements InvocationHandler {
032
033    protected final Mapper mapper;
034
035    protected JDBCMapperTxSuspender(Mapper mapper) {
036        this.mapper = mapper;
037    }
038
039    protected Object doInvoke(Method method, Object[] args) throws Throwable {
040        try {
041            return method.invoke(mapper, args);
042        } catch (InvocationTargetException cause) {
043            throw cause.getTargetException();
044        }
045    }
046
047    @Override
048    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
049        Transaction tx = TransactionHelper.suspendTransaction();
050        try {
051            return doInvoke(method, args);
052        } finally {
053            if (tx != null) {
054                TransactionHelper.resumeTransaction(tx);
055            }
056        }
057    }
058
059    public static Mapper newConnector(Mapper mapper) {
060        return (Mapper) Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
061                new Class<?>[] { Mapper.class }, new JDBCMapperTxSuspender(mapper));
062    }
063}