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DSpaceKernelServletContextListener.java
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DSpaceKernelServletContextListener.java
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/*
* $Id: $
* $URL: $
* DSpaceKernelServletContextListener.java - DSpace2 - Oct 6, 2008 2:22:36 AM - azeckoski
**************************************************************************
* Copyright (c) 2002-2009, The Duraspace Foundation. All rights reserved.
* Licensed under the Duraspace Foundation License.
*
* A copy of the Duraspace License has been included in this
* distribution and is available at: http://scm.dspace.org/svn/repo/licenses/LICENSE.txt
*/
package org.dspace.servicemanager.servlet;
import java.io.File;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import org.dspace.servicemanager.DSpaceKernelImpl;
import org.dspace.servicemanager.DSpaceKernelInit;
import org.dspace.servicemanager.config.DSpaceConfigurationService;
/**
* This servlet context listener will handle startup of the kernel if it is not there,
* shutdown of the context listener does not shutdown the kernel though,
* that is tied to the shutdown of the JVM <br/>
*
* This is implemented in the web application web.xml using:
*
* <web-app>
*
* <listener>
* <listener-class>
* org.dspace.servicemanager.servlet.DSpaceKernelServletContextListener
* </listener-class>
*</listener>
*
* @author Aaron Zeckoski (azeckoski @ gmail.com)
* @author Mark Diggory (mdiggory @ gmail.com)
*/
public class DSpaceKernelServletContextListener implements ServletContextListener {
private transient DSpaceKernelImpl kernelImpl;
/*
* Initially look for JNDI Resource called java:/comp/env/dspace.dir
* otherwise, look for "dspace.dir" initial context param
*/
private String getProvidedHome(ServletContextEvent arg0){
String providedHome = null;
try {
Context ctx = new InitialContext();
providedHome = (String) ctx.lookup("java:/comp/env/" + DSpaceConfigurationService.DSPACE_HOME);
} catch (Exception e) {
// do nothing
}
if (providedHome == null)
{
String dspaceHome = arg0.getServletContext().getInitParameter(DSpaceConfigurationService.DSPACE_HOME);
if(dspaceHome != null && !dspaceHome.equals("") &&
!dspaceHome.equals("${" + DSpaceConfigurationService.DSPACE_HOME + "}")){
File test = new File(dspaceHome);
if(test.exists() && new File(test,DSpaceConfigurationService.DSPACE_CONFIG_PATH).exists())
providedHome = dspaceHome;
}
}
return providedHome;
}
/* (non-Javadoc)
* @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
*/
public void contextInitialized(ServletContextEvent arg0)
{
// start the kernel when the webapp starts
try {
this.kernelImpl = DSpaceKernelInit.getKernel(null);
if (! this.kernelImpl.isRunning()) {
this.kernelImpl.start(getProvidedHome(arg0)); // init the kernel
}
} catch (Exception e) {
// failed to start so destroy it and log and throw an exception
try {
this.kernelImpl.destroy();
} catch (Exception e1) {
// nothing
}
String message = "Failure during filter init: " + e.getMessage();
System.err.println(message + ":" + e);
throw new RuntimeException(message, e);
}
}
/* (non-Javadoc)
* @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
*/
public void contextDestroyed(ServletContextEvent arg0)
{
// currently we are stopping the kernel when the webapp stops
if (this.kernelImpl != null) {
this.kernelImpl.destroy();
this.kernelImpl = null;
}
// No longer going to use JCL
// // clean up the logger for this webapp
// LogFactory.release(Thread.currentThread().getContextClassLoader());
// No longer cleaning this up here since it causes failures
// // cleanup the datasource
// try {
// for (Enumeration<?> e = DriverManager.getDrivers(); e.hasMoreElements(); ) {
// Driver driver = (Driver) e.nextElement();
// if (driver.getClass().getClassLoader() == getClass().getClassLoader()) {
// DriverManager.deregisterDriver(driver);
// }
// }
// } catch (Throwable e) {
// System.err.println("Unable to clean up JDBC driver: " + e.getMessage());
// }
}
}