Glassfish example source code file (Pipeline.java)

This example Glassfish source code file (Pipeline.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

glassfishvalve, glassfishvalve, io, ioexception, ioexception, pipeline, response, response, servlet, servletexception, servletexception

The Glassfish Pipeline.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 *
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 * Copyright 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.catalina;


import org.glassfish.web.valve.GlassFishValve;

import javax.servlet.ServletException;
import java.io.IOException;

/**
 * <p>Interface describing a collection of Valves that should be executed
 * in sequence when the <code>invoke() method is invoked.  It is
 * required that a Valve somewhere in the pipeline (usually the last one)
 * must process the request and create the corresponding response, rather
 * than trying to pass the request on.</p>
 *
 * <p>There is generally a single Pipeline instance associated with each
 * Container.  The container's normal request processing functionality is
 * generally encapsulated in a container-specific Valve, which should always
 * be executed at the end of a pipeline.  To facilitate this, the
 * <code>setBasic() method is provided to set the Valve instance that
 * will always be executed last.  Other Valves will be executed in the order
 * that they were added, before the basic Valve is executed.</p>
 *
 * @author Craig R. McClanahan
 * @author Peter Donald
 * @version $Revision: 1.2 $ $Date: 2005/12/08 01:27:18 $
 */

public interface Pipeline {


    // ------------------------------------------------------------- Properties


    /**
     * <p>Return the Valve instance that has been distinguished as the basic
     * Valve for this Pipeline (if any).
     */
    public GlassFishValve getBasic();


    /**
     * <p>Set the Valve instance that has been distinguished as the basic
     * Valve for this Pipeline (if any).  Prior to setting the basic Valve,
     * the Valve's <code>setContainer() will be called, if it
     * implements <code>Contained, with the owning Container as an
     * argument.  The method may throw an <code>IllegalArgumentException
     * if this Valve chooses not to be associated with this Container, or
     * <code>IllegalStateException if it is already associated with
     * a different Container.</p>
     *
     * @param valve Valve to be distinguished as the basic Valve
     */
    public void setBasic(GlassFishValve valve);


    /**
     * @return true if this pipeline has any non basic valves, false
     * otherwise
     */
    public boolean hasNonBasicValves();


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


    /**
     * <p>Add a new Valve to the end of the pipeline associated with this
     * Container.  Prior to adding the Valve, the Valve's
     * <code>setContainer() method will be called, if it implements
     * <code>Contained, with the owning Container as an argument.
     * The method may throw an
     * <code>IllegalArgumentException if this Valve chooses not to
     * be associated with this Container, or <code>IllegalStateException
     * if it is already associated with a different Container.</p>
     *
     * @param valve Valve to be added
     *
     * @exception IllegalArgumentException if this Container refused to
     *  accept the specified Valve
     * @exception IllegalArgumentException if the specified Valve refuses to be
     *  associated with this Container
     * @exception IllegalStateException if the specified Valve is already
     *  associated with a different Container
     */
    public void addValve(GlassFishValve valve);


    /**
     * Add Tomcat-style valve.
     *
     * @param valve the Tomcat-style valve to be added
     */
    public void addValve(Valve valve);


    /**
     * Return the set of Valves in the pipeline associated with this
     * Container, including the basic Valve (if any).  If there are no
     * such Valves, a zero-length array is returned.
     */
    public GlassFishValve[] getValves();


    /**
     * Cause the specified request and response to be processed by the Valves
     * associated with this pipeline, until one of these valves causes the
     * response to be created and returned.  The implementation must ensure
     * that multiple simultaneous requests (on different threads) can be
     * processed through the same Pipeline without interfering with each
     * other's control flow.
     *
     * @param request The servlet request we are processing
     * @param response The servlet response we are creating
     *
     * @exception IOException if an input/output error occurs
     * @exception ServletException if a servlet exception is thrown
     */
    public void invoke(Request request, Response response)
        throws IOException, ServletException;


    /**
     * Remove the specified Valve from the pipeline associated with this
     * Container, if it is found; otherwise, do nothing.  If the Valve is
     * found and removed, the Valve's <code>setContainer(null) method
     * will be called if it implements <code>Contained.
     *
     * @param valve Valve to be removed
     */
    public void removeValve(GlassFishValve valve);


}