com.zutubi.pulse.master.xwork.interceptor.HibernateSessionInterceptor.java Source code

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Here is the source code for com.zutubi.pulse.master.xwork.interceptor.HibernateSessionInterceptor.java

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/* Copyright 2017 Zutubi Pty Ltd
 *
 * Licensed 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.zutubi.pulse.master.xwork.interceptor;

import com.opensymphony.webwork.ServletActionContext;
import com.opensymphony.xwork.ActionInvocation;
import com.opensymphony.xwork.interceptor.Interceptor;
import com.zutubi.pulse.core.api.PulseRuntimeException;
import org.hibernate.FlushMode;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate4.SessionFactoryUtils;
import org.springframework.orm.hibernate4.SessionHolder;
import org.springframework.transaction.support.TransactionSynchronizationManager;

import javax.servlet.http.HttpServletRequest;

/**
 */
public class HibernateSessionInterceptor implements Interceptor {
    private SessionFactory sessionFactory;

    public void destroy() {

    }

    public void init() {

    }

    public String intercept(ActionInvocation invocation) throws Exception {
        String result = null;

        before(invocation);
        try {
            result = invocation.invoke();
        } finally {
            after(invocation, result);
        }

        return result;
    }

    protected void before(ActionInvocation invocation) throws Exception {
        if (sessionFactory != null) {
            if (TransactionSynchronizationManager.hasResource(sessionFactory)) {
                // Do not modify the Session: just mark the request accordingly.
                String reentryKey = getRentryKey();
                HttpServletRequest request = ServletActionContext.getRequest();
                Integer count = (Integer) request.getAttribute(reentryKey);
                int newCount = (count != null) ? count + 1 : 1;
                request.setAttribute(reentryKey, newCount);
            } else {
                Session session = openSession();
                TransactionSynchronizationManager.bindResource(sessionFactory, new SessionHolder(session));
            }
        }
    }

    protected Session openSession() {
        try {
            Session session = sessionFactory.openSession();
            session.setFlushMode(FlushMode.MANUAL);
            return session;
        } catch (HibernateException ex) {
            throw new PulseRuntimeException("Could not open Hibernate Session", ex);
        }
    }

    protected void after(ActionInvocation dispatcher, String result) throws Exception {
        if (sessionFactory != null) {
            String reentryKey = getRentryKey();
            HttpServletRequest request = ServletActionContext.getRequest();

            Integer count = (Integer) request.getAttribute(reentryKey);
            if (count != null) {
                // Do not modify the Session: just clear the marker.
                if (count > 1) {
                    request.setAttribute(reentryKey, count - 1);
                } else {
                    request.removeAttribute(reentryKey);
                }
            } else {
                SessionHolder sessionHolder = (SessionHolder) TransactionSynchronizationManager
                        .unbindResource(sessionFactory);
                SessionFactoryUtils.closeSession(sessionHolder.getSession());
            }
        }
    }

    private String getRentryKey() {
        return sessionFactory.toString() + ".rentryCount";
    }

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
}