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/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* 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 org.apache.jasper.servlet;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.SingleThreadModel;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.FileNotFoundException;
import org.apache.jasper.JasperException;
import org.apache.jasper.Constants;
import org.apache.jasper.Options;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.compiler.JspRuntimeContext;
import org.apache.jasper.logging.Logger;
/**
* The JSP engine (a.k.a Jasper).
*
* The servlet container is responsible for providing a
* URLClassLoader for the web application context Jasper
* is being used in. Jasper will try get the Tomcat
* ServletContext attribute for its ServletContext class
* loader, if that fails, it uses the parent class loader.
* In either case, it must be a URLClassLoader.
*
* @author Anil K. Vijendran
* @author Harish Prabandham
* @author Remy Maucherat
* @author Kin-man Chung
* @author Glenn Nielsen
*/
public class JspServletWrapper {
private Servlet theServlet;
private String jspUri;
private Class servletClass;
private JspCompilationContext ctxt;
private long available = 0L;
private ServletConfig config;
private Options options;
private boolean firstTime = true;
private boolean reload = true;
JspServletWrapper(ServletConfig config, Options options, String jspUri,
boolean isErrorPage, JspRuntimeContext rctxt)
throws JasperException {
this.config = config;
this.options = options;
this.jspUri = jspUri;
ctxt = new JspCompilationContext( jspUri, isErrorPage,
options,
config.getServletContext(),
this, rctxt);
ctxt.createOutdir();
}
public JspCompilationContext getJspEngineContext() {
return ctxt;
}
public void setReload(boolean reload) {
this.reload = reload;
}
public Servlet getServlet()
throws ServletException, IOException, FileNotFoundException
{
if (reload) {
synchronized (this) {
// Synchronizing on jsw enables simultaneous loading
// of different pages, but not the same page.
if (reload) {
// This is to maintain the original protocol.
destroy();
try {
servletClass = ctxt.load();
theServlet = (Servlet) servletClass.newInstance();
} catch( IllegalAccessException ex1 ) {
throw new JasperException( ex1 );
} catch( InstantiationException ex ) {
throw new JasperException( ex );
}
theServlet.init(config);
firstTime = false;
reload = false;
}
}
}
return theServlet;
}
public ServletContext getServletContext() {
return config.getServletContext();
}
public void service(HttpServletRequest request,
HttpServletResponse response,
boolean precompile)
throws ServletException, IOException, FileNotFoundException {
try {
if (ctxt.isRemoved()) {
throw new FileNotFoundException(jspUri);
}
if ((available > 0L) && (available < Long.MAX_VALUE)) {
response.setDateHeader("Retry-After", available);
response.sendError
(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
Constants.getString("jsp.error.unavailable"));
}
if (options.getDevelopment() || firstTime ) {
synchronized (this) {
ctxt.compile();
}
}
if (reload) {
getServlet();
}
// If a page is to only to be precompiled return.
if (precompile) {
return;
}
if (theServlet instanceof SingleThreadModel) {
// sync on the wrapper so that the freshness
// of the page is determined right before servicing
synchronized (this) {
theServlet.service(request, response);
}
} else {
theServlet.service(request, response);
}
} catch (UnavailableException ex) {
String includeRequestUri = (String)
request.getAttribute("javax.servlet.include.request_uri");
if (includeRequestUri != null) {
// This file was included. Throw an exception as
// a response.sendError() will be ignored by the
// servlet engine.
throw ex;
} else {
int unavailableSeconds = ex.getUnavailableSeconds();
if (unavailableSeconds <= 0) {
unavailableSeconds = 60; // Arbitrary default
}
available = System.currentTimeMillis() +
(unavailableSeconds * 1000L);
response.sendError
(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
ex.getMessage());
}
} catch (FileNotFoundException ex) {
ctxt.incrementRemoved();
String includeRequestUri = (String)
request.getAttribute("javax.servlet.include.request_uri");
if (includeRequestUri != null) {
// This file was included. Throw an exception as
// a response.sendError() will be ignored by the
// servlet engine.
throw new ServletException(ex);
} else {
try {
response.sendError(HttpServletResponse.SC_NOT_FOUND,
ex.getMessage());
} catch (IllegalStateException ise) {
Constants.jasperLog.log(
Constants.getString("jsp.error.file.not.found",
new Object[] { ex.getMessage() }),
ex, Logger.ERROR);
}
}
} catch (ServletException ex) {
throw ex;
} catch (Exception ex) {
throw new JasperException(ex);
}
}
public void destroy() {
if (theServlet != null) {
theServlet.destroy();
}
}
}
