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/*******************************************************************************
* Copyright (c) 2005, 2007 Cognos Incorporated, IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cognos Incorporated - initial API and implementation
* IBM Corporation - bug fixes and enhancements
*******************************************************************************/
package org.eclipse.equinox.http.servlet.internal;
import java.io.IOException;
import java.util.Set;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.osgi.framework.Bundle;
import org.osgi.service.http.HttpContext;
//This class wraps the servlet object registered in the HttpService.registerServlet call, to manage the context classloader when handleRequests are being asked.
//It is also responsible to ensure that a given servlet has only been registered once.
public class ServletRegistration extends Registration {
private Servlet servlet; //The actual servlet object registered against the http service. All requests will eventually be delegated to it.
private HttpContext httpContext; //The context used during the registration of the servlet
private Set servlets; //All the servlets registered against the instance of the proxy servlet that "ownes" self.
private ClassLoader registeredContextClassLoader;
private ProxyContext proxyContext;
public ServletRegistration(Servlet servlet, ProxyContext proxyContext, HttpContext context, Bundle bundle, Set servlets) {
this.servlet = servlet;
this.servlets = servlets;
this.httpContext = context;
this.proxyContext = proxyContext;
registeredContextClassLoader = Thread.currentThread().getContextClassLoader();
}
public void destroy() {
ClassLoader original = Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(registeredContextClassLoader);
super.destroy();
servlet.destroy();
} finally {
Thread.currentThread().setContextClassLoader(original);
}
}
public void close() {
servlets.remove(servlet);
proxyContext.destroyContextAttributes(httpContext);
}
//Delegate the init call to the actual servlet
public void init(ServletConfig servletConfig) throws ServletException {
boolean initialized = false;
proxyContext.createContextAttributes(httpContext);
try {
ClassLoader original = Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(registeredContextClassLoader);
servlet.init(servletConfig);
} finally {
Thread.currentThread().setContextClassLoader(original);
}
servlets.add(servlet);
initialized = true;
} finally {
if (! initialized)
proxyContext.destroyContextAttributes(httpContext);
}
}
public void checkServletRegistration() throws ServletException {
if (servlets.contains(servlet)) {
throw new ServletException("This servlet has already been registered at a different alias."); //$NON-NLS-1$
}
}
//Delegate the handling of the request to the actual servlet
public boolean handleRequest(HttpServletRequest req, HttpServletResponse resp, String alias) throws IOException, ServletException {
HttpServletRequest wrappedRequest = new HttpServletRequestAdaptor(req, alias, servlet);
if (httpContext.handleSecurity(wrappedRequest, resp)) {
ClassLoader original = Thread.currentThread().getContextClassLoader();
try {
Thread.currentThread().setContextClassLoader(registeredContextClassLoader);
servlet.service(wrappedRequest, resp);
} finally {
Thread.currentThread().setContextClassLoader(original);
}
}
return true;
}
}
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