httpsessionwrapper.java

java 写的一个新闻发布系统

package org.jahia.services.applications;

import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

import org.jahia.utils.*;

/**
 * This wrapper ensures the fact that Sessions values are not shared between applications
 * running under Jahia. This isn't the best solution because ideally we should reimplement
 * the SessionManager thread in order to make sure that Session objects are never shared.
 * For development time reasons, we have chose to just modify the keys of storage for
 * attribute names to make sure they are unique.
 *
 * @author Serge Huber
 * @version 1.0
 */
public class HttpSessionWrapper implements HttpSession {

        private String appName;
        private String contextID;
        private HttpSession originalSession;
        private final static String KEY_PREFIX = "org.jahia.";
        private final static String KEY_SEPARATOR = ".";
        private final static boolean debugOutput = false;
        private boolean inheritJahiaSessionAttributes = false;

        /**
         * This constructor sets the wrapping parameters internally. Nothing special done here.
         * @param origSession Original session object around which this wrapper wraps :)
         * @param appName Name of the application used to create unique keys. FIXME : This key is
         * not checked to see if it is globally unique
         */
        public HttpSessionWrapper(HttpSession origSession,
                                  String applicationName,
                                  String contextID,
                                  boolean inheritJahiaSessionAttributes) {
                if (debugOutput) {
                    JahiaConsole.println("SessionWrapper", "Creating session wrapper for application [" + applicationName +
                                         "], contextID [" + contextID + "] from original session object [" + origSession.toString() + "]");
                }
                originalSession = origSession;
                appName = applicationName;
                this.contextID = contextID;
                this.inheritJahiaSessionAttributes = inheritJahiaSessionAttributes;
                if (originalSession.getAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID) == null) {
                   originalSession.setAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID, new Hashtable());
                }
        }

        public long getCreationTime() {
                return originalSession.getCreationTime();
        }

        public String getId() {
                return originalSession.getId();
        }

        public long getLastAccessedTime() {
                return originalSession.getLastAccessedTime();
        }

        public void setMaxInactiveInterval(int interval) {
                originalSession.setMaxInactiveInterval(interval);
        }

        public int getMaxInactiveInterval() {
                return originalSession.getMaxInactiveInterval();
        }

        /**
         * @deprecated
         */
        public HttpSessionContext getSessionContext() {
                return originalSession.getSessionContext();
        }

        public ServletContext getServletContext() {
            //return originalSession.getServletContext();
            // the following is a way to test if the servlet API contains this
            // method. This is the only way to allow support for old versions
            // of the yet unfinalized servlet API
            try {
                Class sessionClass = originalSession.getClass();
                java.lang.reflect.Method theMethod = sessionClass.getMethod("getServletContext", null);
                if (theMethod == null) {
                    return null;
                } else {
                    Object returnValue = theMethod.invoke(sessionClass, null);
                    if (returnValue instanceof ServletContext) {
                        return (ServletContext)returnValue;
                    } else {
                        return null;
                    }
                }
            } catch (Throwable t) {
                return null;
            }
        }

        public Object getAttribute(String name) {
            if (debugOutput) {
                JahiaConsole.println("SessionWrapper", "emulatedSession.getAttribute("+name+") for app ["+KEY_PREFIX + appName + "]");
            }
            Hashtable appAttributes = (Hashtable) originalSession.getAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID);
            if (debugOutput) {
                JahiaConsole.println("SessionWrapper", "...result=[" + appAttributes.get(name) + "]");
            }
            // Try the application attributes, then the global attributes if the
            // flag has been activated.
            Object result = appAttributes.get(name);
            if (inheritJahiaSessionAttributes) {
                if (result == null)
                    result = originalSession.getAttribute(name);
            }
            return result;
        }

        /**
         * @deprecated
         */
        public Object getValue(String name) {
                return getAttribute(name);
        }

        public Enumeration getAttributeNames() {
                Hashtable appAttributes = (Hashtable) originalSession.getAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID);
                return appAttributes.keys();
        }

        /**
         * @deprecated
         */
        public String[] getValueNames() {
                Hashtable appAttributes = (Hashtable) originalSession.getAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID);
                return (String[]) appAttributes.keySet().toArray();
        }

        public void setAttribute(String name,
                                 Object value) {
                // JahiaConsole.println("SessionWrapper", "emulatedSession.setAttribute(" + name + "," + value.toString() + ")");
                Hashtable appAttributes = (Hashtable) originalSession.getAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID);
                appAttributes.put(name, value);
        }

        /**
         * @deprecated
         */
        public void putValue(java.lang.String name,
                             java.lang.Object value) {
                setAttribute(name, value);
        }

        public void removeAttribute(String name) {
                Hashtable appAttributes = (Hashtable) originalSession.getAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID);
                appAttributes.remove(name);
        }

        /**
         * @deprecated
         */
        public void removeValue(String name) {
                removeAttribute(name);
        }

        public void invalidate() {
                originalSession.removeAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID);
                // originalSession.invalidate();
                if (originalSession.getAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID) == null) {
                   originalSession.setAttribute(KEY_PREFIX + appName + KEY_SEPARATOR + contextID, new Hashtable());
                }
        }

        public boolean isNew() {
                return originalSession.isNew();
        }

}