https://projects.eclipse.org/projects/ee4j.grizzly/grizzly-http-servlet: Grizzly Bill of Materials (BOM) (Oracle Corporation) 
/*
 * Copyright (c) 2008, 2017 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.grizzly.servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.DispatcherType;
import static javax.servlet.DispatcherType.REQUEST;
import javax.servlet.Servlet;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.glassfish.grizzly.Grizzly;
import org.glassfish.grizzly.http.Note;
import org.glassfish.grizzly.http.server.AfterServiceListener;
import org.glassfish.grizzly.http.server.HttpHandler;
import org.glassfish.grizzly.http.server.Request;
import org.glassfish.grizzly.http.server.Response;
import org.glassfish.grizzly.http.server.SessionManager;
import org.glassfish.grizzly.http.server.util.ClassLoaderUtil;
import org.glassfish.grizzly.http.server.util.DispatcherHelper;
import org.glassfish.grizzly.http.server.util.Globals;
import org.glassfish.grizzly.http.server.util.HtmlHelper;
import org.glassfish.grizzly.http.server.util.MappingData;
import org.glassfish.grizzly.http.util.CharChunk;
import org.glassfish.grizzly.http.util.Header;
import org.glassfish.grizzly.http.util.HttpRequestURIDecoder;
import org.glassfish.grizzly.http.util.HttpStatus;


HttpHandler implementation that provides an entry point for processing
a Servlet request.

Author:Jeanfrancois Arcand
/**
 * HttpHandler implementation that provides an entry point for processing
 * a Servlet request.
 * 
 * @author Jeanfrancois Arcand
 */
public class ServletHandler extends HttpHandler {

    private static final Logger LOGGER = Grizzly.logger(ServletHandler.class);

    static final Note<HttpServletRequestImpl> SERVLET_REQUEST_NOTE =
            Request.createNote(HttpServletRequestImpl.class.getName());
    static final Note<HttpServletResponseImpl> SERVLET_RESPONSE_NOTE =
            Request.createNote(HttpServletResponseImpl.class.getName());

    static final ServletAfterServiceListener servletAfterServiceListener =
            new ServletAfterServiceListener();

    protected String servletClassName;
    protected Class<? extends Servlet> servletClass;
    protected volatile Servlet servletInstance = null;
    private String contextPath = "";
    private final Object lock = new Object();


    /**
     * The {@link WebappContext}
     */
    private final WebappContext servletCtx;
    /**
     * The {@link ServletConfigImpl}
     */
    private final ServletConfigImpl servletConfig;
    /**
     * The {@link SessionManager}
     */
    private SessionManager sessionManager = ServletSessionManager.instance();
    
Holder for our configured properties.

/**
     * Holder for our configured properties.
     */
    protected final Map<String, Object> properties = new HashMap<String, Object>();
    
Initialize the ServletContext 
/**
     * Initialize the {@link ServletContext}
     */
    protected boolean initialize = true;
    protected ClassLoader classLoader;

    protected ExpectationHandler expectationHandler;

    protected FilterChainFactory filterChainFactory;

    // Listeners to be invoked when ServletHandler.destroy is called
    private List<Runnable> onDestroyListeners;

    // ------------------------------------------------------------ Constructors


    protected ServletHandler(final ServletConfigImpl servletConfig) {
        this.servletConfig = servletConfig;
        servletCtx = (WebappContext) servletConfig.getServletContext();
    }

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

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void start() {
        try {
            configureServletEnv();
        } catch (Throwable t) {
            LOGGER.log(Level.SEVERE, "start", t);
        }
    }

    
Override parent's HttpHandler.sendAcknowledgment(Request, Response) to let ExpectationHandler (if one is registered) process the expectation. 
/**
     * Override parent's {@link HttpHandler#sendAcknowledgment(org.glassfish.grizzly.http.server.Request, org.glassfish.grizzly.http.server.Response)}
     * to let {@link ExpectationHandler} (if one is registered) process the expectation.
     */
    @Override
    protected boolean sendAcknowledgment(Request request, Response response)
            throws IOException {
        return expectationHandler != null
                || super.sendAcknowledgment(request, response);

    }


    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    @Override
    public void service(Request request, Response response) throws Exception {
        if (classLoader != null) {
            final ClassLoader prevClassLoader = Thread.currentThread().getContextClassLoader();
            Thread.currentThread().setContextClassLoader(classLoader);
            try {
                doServletService(request, response);
            } finally {
                Thread.currentThread().setContextClassLoader(prevClassLoader);
            }
        } else {
            doServletService(request, response);
        }
    }

    protected void doServletService(final Request request, final Response response) {
        try {
            final String uri = request.getRequestURI();

            // The request is not for us.
            if (contextPath.length() > 0 && !uri.startsWith(contextPath)) {
                customizeErrorPage(response, "Resource Not Found", 404, null);
                return;
            }

            final HttpServletRequestImpl servletRequest = HttpServletRequestImpl.create();
            final HttpServletResponseImpl servletResponse = HttpServletResponseImpl.create();

            setPathData(request, servletRequest);
            servletRequest.initialize(request, servletResponse, servletCtx);
            servletResponse.initialize(response, servletRequest);

            request.setNote(SERVLET_REQUEST_NOTE, servletRequest);
            request.setNote(SERVLET_RESPONSE_NOTE, servletResponse);

            request.addAfterServiceListener(servletAfterServiceListener);
            
            loadServlet();

            setDispatcherPath(request, getCombinedPath(servletRequest));

            final String serverInfo = servletCtx.getServerInfo();
            if (serverInfo != null && !serverInfo.isEmpty()) {
                servletResponse.addHeader(Header.Server.toString(), serverInfo);
            }
            
            if (expectationHandler != null) {
                final AckActionImpl ackAction = new AckActionImpl(response);
                expectationHandler.onExpectAcknowledgement(servletRequest,
                        servletResponse, ackAction);
                if (!ackAction.isAcknowledged()) {
                    ackAction.acknowledge();
                } else if (ackAction.isFailAcknowledgement()) {
                    return;
                }
            }
            
            FilterChainInvoker filterChain = getFilterChain(request);
            if (filterChain != null) {
                filterChain.invokeFilterChain(servletRequest, servletResponse);
            } else {
                servletInstance.service(servletRequest, servletResponse);
            }

            // Request may want to initialize async processing
            servletRequest.onAfterService();
        } catch (Throwable ex) {
            LOGGER.log(Level.SEVERE, "service exception:", ex);
            customizeErrorPage(response, "Internal Error", 500, ex);
        }
    }

    protected FilterChainInvoker getFilterChain(Request request) {
        if (filterChainFactory != null) {
            return filterChainFactory.createFilterChain(request, servletInstance, REQUEST);
        }
        return null;
    }

    private void setDispatcherPath(final Request request, final String path) {
        request.setAttribute(Globals.DISPATCHER_REQUEST_PATH_ATTR, path);
    }

    
Combines the servletPath and the pathInfo.
If pathInfo is null, it is ignored. If servletPath
is null, then null is returned.

Returns:The combined path with pathInfo appended to servletInfo
/**
     * Combines the servletPath and the pathInfo.
     *
     * If pathInfo is <code>null</code>, it is ignored. If servletPath
     * is <code>null</code>, then <code>null</code> is returned.
     *
     * @return The combined path with pathInfo appended to servletInfo
     */
    private String getCombinedPath(final HttpServletRequest request) {
        if (request.getServletPath() == null) {
            return null;
        }
        if (request.getPathInfo() == null) {
            return request.getServletPath();
        }
        return request.getServletPath() + request.getPathInfo();
    }

    protected void setPathData(final Request from,
                               final HttpServletRequestImpl to) {

        final MappingData data = from.obtainMappingData();
        to.setServletPath(data.wrapperPath.toString());
        to.setPathInfo(data.pathInfo.toString());
        to.setContextPath(data.contextPath.toString());
    }

    void doServletService(final ServletRequest servletRequest,
                          final ServletResponse servletResponse,
                          final DispatcherType dispatcherType)
            throws IOException, ServletException {
        try {
            loadServlet();
            FilterChainImpl filterChain =
                    filterChainFactory.createFilterChain(servletRequest,
                                                         servletInstance,
                                                         dispatcherType);
            if (filterChain != null) {
                filterChain.invokeFilterChain(servletRequest, servletResponse);
            } else {
                servletInstance.service(servletRequest, servletResponse);
            }
        } catch (ServletException se) {
            LOGGER.log(Level.SEVERE, "service exception:", se);
            throw se;
        } catch (IOException ie) {
            LOGGER.log(Level.SEVERE, "service exception:", ie);
            throw ie;
        }
    }

    
Customize the error page returned to the client.

Params:
  • response –  the Response
  • message –   the HTTP error message
  • errorCode – the error code.
/**
     * Customize the error page returned to the client.
     * @param response  the {@link Response}
     * @param message   the HTTP error message
     * @param errorCode the error code.
     */
    public void customizeErrorPage(final Response response,
                                   final String message,
                                   final int errorCode,
                                   final Throwable t) {
        if (!response.isCommitted()) {
            try {
                HtmlHelper.setErrorAndSendErrorPage(response.getRequest(), response,
                        response.getErrorPageGenerator(), errorCode, message,
                        message, t);
            } catch (IOException ex) {
                // We are in a very bad shape. Ignore.
            }
        }
    }

    
Load a Servlet instance. 
Throws:
  • ServletException – If failed to init.init(ServletConfig).
/**
     * Load a {@link Servlet} instance.
     *
     * @throws javax.servlet.ServletException If failed to
     * {@link Servlet#init(javax.servlet.ServletConfig)}.
     */
    protected void loadServlet() throws ServletException {

        if (servletInstance == null) {
            synchronized (lock) {
                if (servletInstance == null) {
                    Servlet newServletInstance;
                    if (servletClassName != null) {
                        newServletInstance = (Servlet) ClassLoaderUtil.load(servletClassName);
                    } else {
                        try {
                            newServletInstance = servletClass.newInstance();
                        } catch (Exception e) {
                            throw new RuntimeException(e);
                        }
                    }
                    LOGGER.log(Level.INFO, "Loading Servlet: {0}", newServletInstance.getClass().getName());
                    newServletInstance.init(servletConfig);
                    servletInstance = newServletInstance;
                }
            }
        }

    }

    
Configure the WebappContext and ServletConfigImpl 
Throws:
  • ServletException – Error while configuring Servlet.
/**
     * Configure the {@link WebappContext}
     * and {@link ServletConfigImpl}
     * 
     * @throws javax.servlet.ServletException Error while configuring
     * {@link Servlet}.
     */
    protected void configureServletEnv() throws ServletException {
        if (contextPath.length() > 0) {
            final CharChunk cc = new CharChunk();
            char[] ch = contextPath.toCharArray();
            cc.setChars(ch, 0, ch.length);
            HttpRequestURIDecoder.normalizeChars(cc);
            contextPath = cc.toString();
        }

        if ("".equals(contextPath)) {
            contextPath = "";
        }

    }

    
Return the Servlet instance used by this ServletHandler 
Returns:Servlet instance.
/**
     * Return the {@link Servlet} instance used by this {@link ServletHandler}
     * @return {@link Servlet} instance.
     */
    @SuppressWarnings({"UnusedDeclaration"})
    public Servlet getServletInstance() {
        return servletInstance;
    }

    
Set the Servlet instance used by this ServletHandler 
Params:
  • servletInstance – an instance of Servlet.
/**
     * Set the {@link Servlet} instance used by this {@link ServletHandler}
     * @param servletInstance an instance of Servlet.
     */
    protected void setServletInstance(Servlet servletInstance) {
        this.servletInstance = servletInstance;
    }

    protected void setServletClassName(final String servletClassName) {
        this.servletClassName = servletClassName;
    }

    protected void setServletClass(final Class<? extends Servlet> servletClass) {
        this.servletClass = servletClass;
    }

    
Set the SessionManager instance used by this ServletHandler 
Params:
  • sessionManager – an implementation of SessionManager.
/**
     * Set the {@link SessionManager} instance used by this {@link ServletHandler}
     * @param sessionManager an implementation of SessionManager.
     */
    protected void setSessionManager(SessionManager sessionManager) {
        this.sessionManager = sessionManager;
    }

    
Returns the portion of the request URI that indicates the context
of the request. The context path always comes first in a request
URI. The path starts with a "/" character but does not end with a "/"
character. For servlets in the default (root) context, this method
returns "". The container does not decode this string.

It is possible that a servlet container may match a context by more than one context path. In such cases this method will return the actual context path used by the request and it may differ from the path returned by the getContextPath.getContextPath() method. The context path returned by getContextPath.getContextPath() should be considered as the prime or preferred context path of the application. 
See Also:
  • getContextPath.getContextPath()
Returns:		a String specifying the
		portion of the request URI that indicates the context
		of the request
/**
     *
     * Returns the portion of the request URI that indicates the context
     * of the request. The context path always comes first in a request
     * URI. The path starts with a "/" character but does not end with a "/"
     * character. For servlets in the default (root) context, this method
     * returns "". The container does not decode this string.
     *
     * <p>It is possible that a servlet container may match a context by
     * more than one context path. In such cases this method will return the
     * actual context path used by the request and it may differ from the
     * path returned by the
     * {@link javax.servlet.ServletContext#getContextPath()} method.
     * The context path returned by
     * {@link javax.servlet.ServletContext#getContextPath()}
     * should be considered as the prime or preferred context path of the
     * application.
     *
     * @return		a <code>String</code> specifying the
     *			portion of the request URI that indicates the context
     *			of the request
     *
     * @see javax.servlet.ServletContext#getContextPath()
     */
    public String getContextPath() {
        return contextPath;
    }

    
Programmatically set the context path of the Servlet.

Params:
  • contextPath – Context path.
/**
     * Programmatically set the context path of the Servlet.
     *
     * @param contextPath Context path.
     */
    public void setContextPath(String contextPath) {
        this.contextPath = contextPath;
    }

    
Destroy this Servlet and its associated ServletContextListener 
/**
     * Destroy this Servlet and its associated
     * {@link javax.servlet.ServletContextListener}
     */
    @Override
    public void destroy() {
        try {
            if (classLoader != null) {
                ClassLoader prevClassLoader = Thread.currentThread().getContextClassLoader();
                Thread.currentThread().setContextClassLoader(classLoader);
                try {
                    super.destroy();

                    if (servletInstance != null) {
                        servletInstance.destroy();
                        servletInstance = null;
                    }
                } finally {
                    Thread.currentThread().setContextClassLoader(prevClassLoader);
                }
            } else {
                super.destroy();
            }
        } finally {
            // notify destroy listeners (if any)
            if (onDestroyListeners != null) {
                for (int i = 0; i < onDestroyListeners.size(); i++) {
                    try {
                        onDestroyListeners.get(i).run();
                    } catch (Throwable t) {
                        LOGGER.log(Level.WARNING, "onDestroyListener error", t);
                    }
                }

                onDestroyListeners = null;
            }
        }
    }


    protected WebappContext getServletCtx() {
        return servletCtx;
    }

    public ClassLoader getClassLoader() {
        return classLoader;
    }

    public void setClassLoader(ClassLoader classLoader) {
        this.classLoader = classLoader;
    }

    public ServletConfigImpl getServletConfig() {
        return servletConfig;
    }

    @Override
    public String getName() {
        return servletConfig.getServletName();
    }

    
Get the ExpectationHandler responsible for processing Expect: header (for example "Expect: 100-Continue").

Returns:the ExpectationHandler responsible for processing Expect: header (for example "Expect: 100-Continue").
/**
     * Get the {@link ExpectationHandler} responsible for processing
     * <tt>Expect:</tt> header (for example "Expect: 100-Continue").
     * 
     * @return the {@link ExpectationHandler} responsible for processing
     * <tt>Expect:</tt> header (for example "Expect: 100-Continue").
     */
    public ExpectationHandler getExpectationHandler() {
        return expectationHandler;
    }
    
    
Set the ExpectationHandler responsible for processing Expect: header (for example "Expect: 100-Continue").

Params:
  • expectationHandler –  the ExpectationHandler responsible for processing Expect: header (for example "Expect: 100-Continue").
/**
     * Set the {@link ExpectationHandler} responsible for processing
     * <tt>Expect:</tt> header (for example "Expect: 100-Continue").
     * 
     * @param expectationHandler  the {@link ExpectationHandler} responsible
     * for processing <tt>Expect:</tt> header (for example "Expect: 100-Continue").
     */
    public void setExpectationHandler(ExpectationHandler expectationHandler) {
        this.expectationHandler = expectationHandler;
    }
    
    @Override
    protected void setDispatcherHelper( final DispatcherHelper dispatcherHelper ) {
        servletCtx.setDispatcherHelper( dispatcherHelper );
    }

    protected void setFilterChainFactory(final FilterChainFactory filterChainFactory) {
        this.filterChainFactory = filterChainFactory;
    }

    
Overrides default (JSESSIONID) session cookie name.

Returns:the session cookie name
/**
     * Overrides default (JSESSIONID) session cookie name.
     * @return the session cookie name
     */
    @Override
    protected String getSessionCookieName() {
        return servletCtx.getSessionCookieConfig().getName();
    }

    
Returns:Servlet-aware SessionManager
/**
     * @return Servlet-aware {@link SessionManager}
     */
    @Override
    protected SessionManager getSessionManager(Request request) {
        final SessionManager sm = request.getHttpFilter()
                .getConfiguration().getSessionManager();
        return sm != null ? sm : this.sessionManager;
    }
    
    
Adds the Runnable, which will be invoked when destroy() is called. 
Params:
  • r – Runnable, which contains destroy listener logic.
/**
     * Adds the {@link Runnable}, which will be invoked when {@link #destroy()} is called.
     * @param r {@link Runnable}, which contains destroy listener logic.
     */
    void addOnDestroyListener(final Runnable r) {
        if (onDestroyListeners == null) {
            onDestroyListeners = new ArrayList<Runnable>(2);
        }
        
        onDestroyListeners.add(r);
    }

    // ---------------------------------------------------------- Nested Classes

    
AfterServiceListener, which is responsible for recycle servlet request and response
objects.

/**
     * AfterServiceListener, which is responsible for recycle servlet request and response
     * objects.
     */
    static final class ServletAfterServiceListener implements AfterServiceListener {

        @Override
        public void onAfterService(final Request request) {
            final HttpServletRequestImpl servletRequest = getServletRequest(request);
            final HttpServletResponseImpl servletResponse = getServletResponse(request);

            if (servletRequest != null) {
                servletRequest.recycle();
                servletResponse.recycle();
            }
        }
    }
    
    static final class AckActionImpl implements ExpectationHandler.AckAction {
        private boolean isAcknowledged;
        private boolean isFailAcknowledgement;
        
        private final Response response;

        private AckActionImpl(final Response response) {
            this.response = response;
        }
        
        @Override
        public void acknowledge() throws IOException {
            if (isAcknowledged) {
                throw new IllegalStateException("Already acknowledged");
            }
            
            isAcknowledged = true;
            response.setStatus(HttpStatus.CONINTUE_100);
            response.sendAcknowledgement();
        }

        @Override
        public void fail() throws IOException {
            if (isAcknowledged) {
                throw new IllegalStateException("Already acknowledged");
            }
            isAcknowledged = true;
            isFailAcknowledgement = true;
            
            response.setStatus(HttpStatus.EXPECTATION_FAILED_417);
            response.finish();
        }

        public boolean isAcknowledged() {
            return isAcknowledged;
        }

        public boolean isFailAcknowledgement() {
            return isFailAcknowledgement;
        }
    }
    
    static HttpServletRequestImpl getServletRequest(final Request request) {
        return request.getNote(SERVLET_REQUEST_NOTE);
    }
    
    static HttpServletResponseImpl getServletResponse(final Request request) {
        return request.getNote(SERVLET_RESPONSE_NOTE);
    }
}