Source Code Cross Referenced for DispatcherState.java in  » Portal » Open-Portal » com » sun » portal » container » portlet » impl » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Portal » Open Portal » com.sun.portal.container.portlet.impl 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002 Sun Microsystems, Inc. All
003:         * rights reserved. Use of this product is subject
004:         * to license terms. Federal Acquisitions:
005:         * Commercial Software -- Government Users
006:         * Subject to Standard License Terms and
007:         * Conditions.
008:         *
009:         * Sun, Sun Microsystems, the Sun logo, and Sun ONE
010:         * are trademarks or registered trademarks of Sun Microsystems,
011:         * Inc. in the United States and other countries.
012:         */
013:
014:        package com.sun.portal.container.portlet.impl;
015:
016:        import java.util.Map;
017:        import java.util.HashMap;
018:        import java.util.List;
019:        import java.util.ArrayList;
020:        import java.util.Iterator;
021:
022:        /**
023:         * DispatcherState is the class that keeps the state information about
024:         * what portlets have called the dispatcher to PAE.  It controls which
025:         * portlets can safely call the dispatcher to PAE and which portlets must
026:         * wait.  DispatcherState objects are stored as HttpServletRequest attribute
027:         * by PortletContainer.  Since there is no synchronizing code in this class,
028:         * the user (PortletContainer) must make sure it syncs around calls to the
029:         * class.
030:         **/
031:        public class DispatcherState {
032:
033:            private int count;
034:            private String runningAppName;
035:            private boolean isSessionEnabled;
036:
037:            /**
038:             * Return whether the portlet can safely use dispatcher to PAE.  If the
039:             * return value is false, the caller should call wait().  It will be woke 
040:             * up by notifyAll() when all the portlets have exited the ciritical
041:             * section.  However, the portlet should call canEnter() again to make
042:             * sure it is save to enter the cirtical section after being waken up.
043:             *
044:             * @param appName   application name the portlet belongs to.
045:             * @param portletSessionless   ture if the portlet does not use session,
046:             *                             false otherwise.
047:             * @param serializeAll  ture if serialization is needed at all time.
048:             *
049:             * @return ture if the portlet can safely use the dispatcher to PAE,
050:             *         false otherwise.
051:             **/
052:            public boolean canEnter(String appName,
053:                    boolean portletSessionEnabled, boolean serializeAll) {
054:                if (serializeAll) {
055:                    if (runningAppName == null) {
056:
057:                        // nobody is running!
058:
059:                        runningAppName = appName;
060:                        isSessionEnabled = portletSessionEnabled;
061:                        count = 1;
062:                        return true;
063:                    } else {
064:                        return false;
065:                    }
066:                } else {
067:                    if (runningAppName == null) {
068:
069:                        // nobody is running!
070:
071:                        runningAppName = appName;
072:                        isSessionEnabled = portletSessionEnabled;
073:                        count = 1;
074:                        return true;
075:
076:                    } else if (!isSessionEnabled && !portletSessionEnabled) {
077:
078:                        // Everybody is sessionless, join the party!
079:
080:                        count++;
081:                        return true;
082:                    } else {
083:
084:                        return false;
085:
086:                    }
087:                }
088:            }
089:
090:            /**
091:             * Return whether the portlet is the last one to exit the critical section
092:             * for dispatcher to PAE.  If the return value is true, the caller should
093:             * call wakeThreads() to wake up waiting threads.
094:             *
095:             * @return ture when it is the last portlet to exit critical section,
096:             *         false otherwise.
097:             **/
098:            public boolean exit() {
099:                count--;
100:                if (count == 0) {
101:                    runningAppName = null;
102:                    return true;
103:                } else {
104:                    return false;
105:                }
106:            }
107:
108:        }
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