standardwrappervalve.java

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/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
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 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */


package org.apache.catalina.core;


import java.io.IOException;

import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.Context;
import org.apache.catalina.Globals;
import org.apache.catalina.HttpRequest;
import org.apache.catalina.Logger;
import org.apache.catalina.Request;
import org.apache.catalina.Response;
import org.apache.catalina.ValveContext;
import org.apache.catalina.connector.ClientAbortException;
import org.apache.catalina.util.StringManager;
import org.apache.catalina.valves.ValveBase;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tomcat.util.buf.MessageBytes;

/**
 * Valve that implements the default basic behavior for the
 * <code>StandardWrapper</code> container implementation.
 *
 * @author Craig R. McClanahan
 * @version $Revision: 1.24 $ $Date: 2003/12/22 17:47:43 $
 */

final class StandardWrapperValve
    extends ValveBase {

    private static Log log = LogFactory.getLog(StandardWrapperValve.class);

    // ----------------------------------------------------- Instance Variables


    // Some JMX statistics. This vavle is associated with a StandardWrapper.
    // We exponse the StandardWrapper as JMX ( j2eeType=Servlet ). The fields
    // are here for performance.
    private long processingTime;
    private long maxTime;
    private long minTime = Long.MAX_VALUE;
    private int requestCount;
    private int errorCount;


    /**
     * The string manager for this package.
     */
    private static final StringManager sm =
        StringManager.getManager(Constants.Package);


    // --------------------------------------------------------- Public Methods


    /**
     * Invoke the servlet we are managing, respecting the rules regarding
     * servlet lifecycle and SingleThreadModel support.
     *
     * @param request Request to be processed
     * @param response Response to be produced
     * @param valveContext Valve context used to forward to the next Valve
     *
     * @exception IOException if an input/output error occurred
     * @exception ServletException if a servlet error occurred
     */
    public final void invoke(Request request, Response response,
                             ValveContext valveContext)
        throws IOException, ServletException {

        // Initialize local variables we may need
        boolean unavailable = false;
        Throwable throwable = null;
        // This should be a Request attribute...
        long t1=System.currentTimeMillis();
        requestCount++;
        StandardWrapper wrapper = (StandardWrapper) getContainer();
        HttpRequest hrequest = (HttpRequest) request;
        Servlet servlet = null;
        HttpServletRequest hreq = (HttpServletRequest) request.getRequest();
        HttpServletResponse hres =
            (HttpServletResponse) response.getResponse();

        // Check for the application being marked unavailable
        if (!((Context) wrapper.getParent()).getAvailable()) {
            hres.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
                           sm.getString("standardContext.isUnavailable"));
            unavailable = true;
        }

        // Check for the servlet being marked unavailable
        if (!unavailable && wrapper.isUnavailable()) {
            log(sm.getString("standardWrapper.isUnavailable",
                             wrapper.getName()));
            if (hres == null) {
                ;       // NOTE - Not much we can do generically
            } else {
                long available = wrapper.getAvailable();
                if ((available > 0L) && (available < Long.MAX_VALUE)) {
                    hres.setDateHeader("Retry-After", available);
                    hres.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
                               sm.getString("standardWrapper.isUnavailable",
                                            wrapper.getName()));
                } else if (available == Long.MAX_VALUE) {
                    hres.sendError(HttpServletResponse.SC_NOT_FOUND,
                               sm.getString("standardWrapper.notFound",
                                            wrapper.getName()));
                }
            }
            unavailable = true;
        }

        // Allocate a servlet instance to process this request
        try {
            if (!unavailable) {
                servlet = wrapper.allocate();
            }
        } catch (UnavailableException e) {
            long available = wrapper.getAvailable();
            if ((available > 0L) && (available < Long.MAX_VALUE)) {
                hres.setDateHeader("Retry-After", available);
                hres.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE,
                           sm.getString("standardWrapper.isUnavailable",
                                        wrapper.getName()));
            } else if (available == Long.MAX_VALUE) {
                hres.sendError(HttpServletResponse.SC_NOT_FOUND,
                           sm.getString("standardWrapper.notFound",
                                        wrapper.getName()));
            }
        } catch (ServletException e) {
            log(sm.getString("standardWrapper.allocateException",
                             wrapper.getName()), e);
            throwable = e;
            exception(request, response, e);
            servlet = null;
        } catch (Throwable e) {
            log(sm.getString("standardWrapper.allocateException",
                             wrapper.getName()), e);
            throwable = e;
            exception(request, response, e);
            servlet = null;
        }

        // Acknowlege the request
        try {
            response.sendAcknowledgement();
        } catch (IOException e) {
            hreq.removeAttribute(Globals.JSP_FILE_ATTR);
            log(sm.getString("standardWrapper.acknowledgeException",
                             wrapper.getName()), e);
            throwable = e;
            exception(request, response, e);
        } catch (Throwable e) {
            log(sm.getString("standardWrapper.acknowledgeException",
                             wrapper.getName()), e);
            throwable = e;
            exception(request, response, e);
            servlet = null;
        }
        MessageBytes requestPathMB = null;
        if (hreq != null) {
            requestPathMB = hrequest.getRequestPathMB();
        }
        hreq.setAttribute
            (ApplicationFilterFactory.DISPATCHER_TYPE_ATTR,
             ApplicationFilterFactory.REQUEST_INTEGER);
        hreq.setAttribute
            (ApplicationFilterFactory.DISPATCHER_REQUEST_PATH_ATTR,
             requestPathMB);
        // Create the filter chain for this request
        ApplicationFilterFactory factory =
            ApplicationFilterFactory.getInstance();
        ApplicationFilterChain filterChain =
            factory.createFilterChain((ServletRequest) request,
                                      wrapper, servlet);

        // Call the filter chain for this request
        // NOTE: This also calls the servlet's service() method
        try {
            String jspFile = wrapper.getJspFile();
            if (jspFile != null)
                hreq.setAttribute(Globals.JSP_FILE_ATTR, jspFile);