Source Code Cross Referenced for FiberContextSwitchInterceptor.java in  » 6.0-JDK-Modules » jax-ws-runtime » com » sun » xml » ws » api » pipe » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » jax ws runtime » com.sun.xml.ws.api.pipe 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         * 
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         * 
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common Development
008:         * and Distribution License("CDDL") (collectively, the "License").  You
009:         * may not use this file except in compliance with the License. You can obtain
010:         * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
011:         * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
012:         * language governing permissions and limitations under the License.
013:         * 
014:         * When distributing the software, include this License Header Notice in each
015:         * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
016:         * Sun designates this particular file as subject to the "Classpath" exception
017:         * as provided by Sun in the GPL Version 2 section of the License file that
018:         * accompanied this code.  If applicable, add the following below the License
019:         * Header, with the fields enclosed by brackets [] replaced by your own
020:         * identifying information: "Portions Copyrighted [year]
021:         * [name of copyright owner]"
022:         * 
023:         * Contributor(s):
024:         * 
025:         * If you wish your version of this file to be governed by only the CDDL or
026:         * only the GPL Version 2, indicate your decision by adding "[Contributor]
027:         * elects to include this software in this distribution under the [CDDL or GPL
028:         * Version 2] license."  If you don't indicate a single choice of license, a
029:         * recipient has the option to distribute your version of this file under
030:         * either the CDDL, the GPL Version 2 or to extend the choice of license to
031:         * its licensees as provided above.  However, if you add GPL Version 2 code
032:         * and therefore, elected the GPL Version 2 license, then the option applies
033:         * only if the new code is made subject to such option by the copyright
034:         * holder.
035:         */
036:
037:        package com.sun.xml.ws.api.pipe;
038:
039:        import java.security.AccessController;
040:        import java.security.PrivilegedAction;
041:
042:        /**
043:         * Interception for {@link Fiber} context switch.
044:         *
045:         * <p>
046:         * Even though pipeline runs asynchronously, sometimes it's desirable
047:         * to bind some state to the current thread running a fiber. Such state
048:         * may include security subject (in terms of {@link AccessController#doPrivileged}),
049:         * or a transaction.
050:         *
051:         * <p>
052:         * This mechanism makes it possible to do such things, by allowing
053:         * some code to be executed before and after a thread executes a fiber.
054:         *
055:         * <p>
056:         * The design also encapsulates the entire fiber execution in a single
057:         * opaque method invocation {@link Work#execute}, allowing the use of
058:         * <tt>finally</tt> block. 
059:         *
060:         *
061:         * @author Kohsuke Kawaguchi
062:         */
063:        public interface FiberContextSwitchInterceptor {
064:            /**
065:             * Allows the interception of the fiber execution.
066:             *
067:             * <p>
068:             * This method needs to be implemented like this:
069:             *
070:             * <pre>
071:             * &lt;R,P> R execute( Fiber f, P p, Work&lt;R,P> work ) {
072:             *   // do some preparation work
073:             *   ...
074:             *   try {
075:             *     // invoke
076:             *     return work.execute(p);
077:             *   } finally {
078:             *     // do some clean up work
079:             *     ...
080:             *   }
081:             * }
082:             * </pre>
083:             *
084:             * <p>
085:             * While somewhat unintuitive,
086:             * this interception mechanism enables the interceptor to wrap
087:             * the whole fiber execution into a {@link AccessController#doPrivileged(PrivilegedAction)},
088:             * for example.
089:             *
090:             * @param f
091:             *      {@link Fiber} to be executed.
092:             * @param p
093:             *      The opaque parameter value for {@link Work}. Simply pass this value to
094:             *      {@link Work#execute(Object)}.
095:             * @return
096:             *      The opaque return value from the the {@link Work}. Simply return
097:             *      the value from {@link Work#execute(Object)}.
098:             */
099:            <R, P> R execute(Fiber f, P p, Work<R, P> work);
100:
101:            /**
102:             * Abstraction of the execution that happens inside the interceptor.
103:             */
104:            interface Work<R, P> {
105:                /**
106:                 * Have the current thread executes the current fiber,
107:                 * and returns when it stops doing so.
108:                 *
109:                 * <p>
110:                 * The parameter and the return value is controlled by the
111:                 * JAX-WS runtime, and interceptors should simply treat
112:                 * them as opaque values.
113:                 */
114:                R execute(P param);
115:            }
116:        }
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