com.knowbout.hibernate.OpenTransactionInViewFilter.java Source code

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Here is the source code for com.knowbout.hibernate.OpenTransactionInViewFilter.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.    
 */

package com.knowbout.hibernate;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * The <code>OpenTransactionInViewFilter</code> class
 * @author almilli
 */
public class OpenTransactionInViewFilter implements Filter {
    private static final Log log = LogFactory.getLog(OpenTransactionInViewFilter.class);
    private boolean printFullExceptions;

    /**
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    public void init(FilterConfig config) throws ServletException {
        String printFullExceptionsString = config.getInitParameter("printFullExceptions");
        if (printFullExceptionsString != null && printFullExceptionsString.toLowerCase().equals("true")) {
            printFullExceptions = true;
        }
    }

    /**
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
     */
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        TransactionManager.beginTransaction();
        boolean commit = false;
        try {
            chain.doFilter(request, response);
            commit = !TransactionManager.isRollbackOnly();
        } catch (ServletException se) {
            String message = se.toString();
            if (se.getRootCause() != null) {
                message = se.getRootCause().toString();
            }
            if (printFullExceptions) {
                if (se.getRootCause() != null) {
                    log.error(message, se.getRootCause());
                } else {
                    log.error(message, se);
                }
            } else {
                log.error(message);
            }
            commit = false;
            throw se;
        } catch (Throwable t) {
            log.error("Error with transaction, rolling back instead.", t);
            commit = false;
        } finally {
            //dispose of the open transaction by commit or rollback
            //transactionHolder.remove(transaction);
            if (commit) {
                try {
                    TransactionManager.commitTransaction();
                } catch (Throwable e) {
                    log.error("Cannot commit transaction, rolling back instead.", e);
                    TransactionManager.rollbackTransaction();
                    throw new ServletException(e);
                }
            } else {
                try {
                    TransactionManager.rollbackTransaction();
                } catch (Throwable e) {
                    log.error("Cannot rollback transaction.", e);
                    throw new ServletException(e);
                }
            }
        }
    }

    /**
     * @see javax.servlet.Filter#destroy()
     */
    public void destroy() {
    }
}