001/*
002 * Copyright 2012 Atteo.
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 */
016package org.atteo.moonshine.jta;
017
018import java.io.IOException;
019
020import javax.inject.Singleton;
021import javax.servlet.Filter;
022import javax.servlet.FilterChain;
023import javax.servlet.FilterConfig;
024import javax.servlet.ServletException;
025import javax.servlet.ServletRequest;
026import javax.servlet.ServletResponse;
027
028/**
029 * {@link Filter} which wraps the request handling inside JTA transaction.
030 */
031@Singleton
032public class TransactionalFilter implements Filter {
033
034    @Override
035    public void init(FilterConfig filterConfig) throws ServletException {
036    }
037
038    @Override
039    public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain)
040            throws IOException, ServletException {
041        try {
042            Transaction.require(new Transaction.ThrowingRunnable<Exception>() {
043                @Override
044                public void run() throws IOException, ServletException {
045                    chain.doFilter(request, response);
046                }
047            });
048        } catch (RuntimeException | ServletException | IOException e) {
049            throw e;
050        } catch (Exception e) {
051            throw new RuntimeException("Internal error, unexpected exception", e);
052        }
053    }
054
055    @Override
056    public void destroy() {
057    }
058}