org.pentaho.plugin.j2ee.ServletAdapterContentGenerator.java Source code

Introduction

Here is the source code for org.pentaho.plugin.j2ee.ServletAdapterContentGenerator.java

Source

/*
 * The MIT License
 * 
 * Copyright (c) 2011, Aaron Phillips
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.pentaho.plugin.j2ee;

import java.io.File;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.codehaus.enunciate.modules.jersey.EnunciateJerseyServletContainer;
import org.pentaho.platform.api.engine.IPluginManager;
import org.pentaho.platform.engine.core.system.PentahoSystem;
import org.pentaho.platform.engine.services.solution.BaseContentGenerator;
import org.pentaho.platform.plugin.services.pluginmgr.PluginClassLoader;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;
import org.springframework.security.wrapper.SavedRequestAwareWrapper;

@SuppressWarnings("serial")
public class ServletAdapterContentGenerator extends BaseContentGenerator {

    private static final Log logger = LogFactory.getLog(ServletAdapterContentGenerator.class);

    private IPluginManager pm = PentahoSystem.get(IPluginManager.class);

    private static ConfigurableApplicationContext appContext;

    private static final String PLUGIN_ID = "j2ee";

    //  private static JAXRSPluginServlet servlet;
    private static EnunciateJerseyServletContainer servlet;

    public ServletAdapterContentGenerator() throws ServletException {
        final ClassLoader origLoader = Thread.currentThread().getContextClassLoader();
        final PluginClassLoader tempLoader = (PluginClassLoader) pm.getClassLoader(PLUGIN_ID);
        try {
            Thread.currentThread().setContextClassLoader(tempLoader);

            if (appContext == null) {
                appContext = getSpringBeanFactory();
                //        servlet = (JAXRSPluginServlet) appContext.getBean("jaxrsPluginServlet");
                servlet = (EnunciateJerseyServletContainer) appContext.getBean("enunciatePluginServlet");
                servlet.init(new MutableServletConfig("ServletAdapterContentGenerator"));
            }
        } finally {
            Thread.currentThread().setContextClassLoader(origLoader);
        }
    }

    @SuppressWarnings("nls")
    @Override
    public void createContent() throws Exception {
        Object requestOrWrapper = this.parameterProviders.get("path").getParameter("httprequest");
        HttpServletRequest request = null;
        if (requestOrWrapper instanceof SavedRequestAwareWrapper) {
            request = (HttpServletRequest) ((SavedRequestAwareWrapper) requestOrWrapper).getRequest();
        } else {
            request = (HttpServletRequest) requestOrWrapper;
        }
        HttpServletResponse response = (HttpServletResponse) this.parameterProviders.get("path")
                .getParameter("httpresponse");

        final ClassLoader origLoader = Thread.currentThread().getContextClassLoader();
        final PluginClassLoader tempLoader = (PluginClassLoader) pm.getClassLoader(PLUGIN_ID);
        try {
            Thread.currentThread().setContextClassLoader(tempLoader);
            servlet.service(request, response);
        } finally {
            Thread.currentThread().setContextClassLoader(origLoader);
        }
    }

    @Override
    public Log getLogger() {
        return logger;
    }

    private ConfigurableApplicationContext getSpringBeanFactory() {
        final PluginClassLoader loader = (PluginClassLoader) pm.getClassLoader(PLUGIN_ID);
        File f = new File(loader.getPluginDir(), "plugin.spring.xml"); //$NON-NLS-1$
        if (f.exists()) {
            logger.debug("Found plugin spring file @ " + f.getAbsolutePath()); //$NON-NLS-1$
            ConfigurableApplicationContext context = new FileSystemXmlApplicationContext(
                    "file:" + f.getAbsolutePath()) { //$NON-NLS-1$
                @Override
                protected void initBeanDefinitionReader(XmlBeanDefinitionReader beanDefinitionReader) {

                    beanDefinitionReader.setBeanClassLoader(loader);
                }

                @Override
                protected void prepareBeanFactory(ConfigurableListableBeanFactory clBeanFactory) {
                    super.prepareBeanFactory(clBeanFactory);
                    clBeanFactory.setBeanClassLoader(loader);
                }

                /** Critically important to override this and return the desired CL **/
                @Override
                public ClassLoader getClassLoader() {
                    return loader;
                }
            };
            return context;
        }
        throw new IllegalStateException("no plugin.spring.xml file found"); //$NON-NLS-1$
    }

}