Source Code Cross Referenced for HttpSession.java in  » EJB-Server-resin-3.1.5 » jsdk » javax » servlet » http » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server resin 3.1.5 » jsdk » javax.servlet.http 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 1998-2001 Caucho Technology -- all rights reserved
003:         *
004:         * This file is part of Resin(R) Open Source
005:         *
006:         * Each copy or derived work must preserve the copyright notice and this
007:         * notice unmodified.
008:         *
009:         * Resin Open Source is free software; you can redistribute it and/or modify
010:         * it under the terms of the GNU General Public License as published by
011:         * the Free Software Foundation; either version 2 of the License, or
012:         * (at your option) any later version.
013:         *
014:         * Resin Open Source is distributed in the hope that it will be useful,
015:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
016:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
017:         * of NON-INFRINGEMENT.  See the GNU General Public License for more
018:         * details.
019:         *
020:         * You should have received a copy of the GNU General Public License
021:         * along with Resin Open Source; if not, write to the
022:         *
023:         *   Free Software Foundation, Inc.
024:         *   59 Temple Place, Suite 330
025:         *   Boston, MA 02111-1307  USA
026:         *
027:         * @author Scott Ferguson
028:         */
029:
030:        package javax.servlet.http;
031:
032:        import javax.servlet.ServletContext;
033:        import java.util.Enumeration;
034:
035:        /**
036:         * Sessions are a convenient way to connect users to web pages.  Because
037:         * HTTP requests are intrinsically stateless, cookies and sessions are
038:         * needed to implement more sophisticated interfaces like user preferences.
039:         *
040:         * <p>Because a web site might easily have thousands of simultaneous
041:         * sessions, session attributes generally store small chunks of data
042:         * rather than large objects.
043:         *
044:         * <p>The servlet engine controls the number of active sessions through
045:         * two methods: a time limit on inactive sessions, and
046:         * a cap on the number of active sessions.  The cap on the number of
047:         * sessions is controlled by an LRU mechanism, so active sessions will not
048:         * be culled.
049:         *
050:         * Session configuration is per-application.  It looks like:
051:         * <code><pre>
052:         * &lt;session-config session-max='4096'
053:         *                 session-timeout='30'/>
054:         * </pre></code>
055:         *
056:         * <h4>Load balancing</h4>
057:         *
058:         * When using load balancing with Apache, sessions will always go to the
059:         * same JVM.  The session id encodes the JVM which first created the session.
060:         */
061:        public interface HttpSession {
062:            /**
063:             * Returns the id for the session.  The session variable name is
064:             * 'jsessionid'.  <code>getId</code> returns the randomly generated
065:             * value.
066:             */
067:            public String getId();
068:
069:            /**
070:             * Returns true if the session is new.  If the servlet engine found the
071:             * session from the client's request, <code>isNew</code> is false.
072:             */
073:            public boolean isNew();
074:
075:            /**
076:             * Returns the time when the session was created.
077:             */
078:            public long getCreationTime();
079:
080:            /**
081:             * Returns the time when the session was last accessed.
082:             */
083:            public long getLastAccessedTime();
084:
085:            /**
086:             * Sets the maximum inactive interval.  Sessions have a limited lifetime.
087:             * When the lifetime ends, the session will be invalidated.
088:             *
089:             * @param interval the new inactive interval in seconds.
090:             */
091:            public void setMaxInactiveInterval(int interval);
092:
093:            /*
094:             * @return the new inactive interval in seconds.
095:             */
096:            public int getMaxInactiveInterval();
097:
098:            /**
099:             * Returns a session value.
100:             *
101:             * @param name of the attribute.
102:             * @return stored value
103:             */
104:            public Object getAttribute(String name);
105:
106:            /**
107:             * Returns an enumeration of all the attribute names.
108:             */
109:            public Enumeration getAttributeNames();
110:
111:            /**
112:             * Sets an attribute value.  Because servlets are multithreaded,
113:             * setting HttpSession attributes will generally need synchronization.
114:             * Remember, users may open multiple browsers to the same page.
115:             *
116:             * <p>A typical initialization of an session attribute might look like:
117:             * <code><pre>
118:             * HttpSession session = request.getSession();
119:             * String user;
120:             * synchronized (session) {
121:             *   user = (String) session.getAttribute("user");
122:             *   if (user == null) {
123:             *     user = lookupUser(request);
124:             *     sesion.setAttribute("user", user);
125:             *   }
126:             * }
127:             * </pre></code>
128:             *
129:             * @param name of the attribute.
130:             * @param value value to store
131:             */
132:            public void setAttribute(String name, Object value);
133:
134:            /**
135:             * Removes an attribute.  If the attribute value implements
136:             * HttpSessionBindingListener, it will receive a notice when
137:             * it is removed. Because servlets are multithreaded,
138:             * removing ServletContext attributes will generally need synchronization.
139:             *
140:             * @param name of the attribute.
141:             */
142:            public void removeAttribute(String name);
143:
144:            /**
145:             * Invalidates the current session.  Calling most of the session methods
146:             * after invalidation will throw an IllegalStateException.
147:             *
148:             * <p>All attribute values which implement HttpSessionBindingListener,
149:             * will receive a notice when they're removed at invalidation.
150:             */
151:            public void invalidate();
152:
153:            /**
154:             * @deprecated
155:             */
156:            public HttpSessionContext getSessionContext();
157:
158:            /**
159:             * Returns the owning servlet context.
160:             */
161:            public ServletContext getServletContext();
162:
163:            /**
164:             * @deprecated
165:             */
166:            public Object getValue(String name);
167:
168:            /**
169:             * @deprecated
170:             */
171:            public String[] getValueNames();
172:
173:            /**
174:             * @deprecated
175:             */
176:            public void putValue(String name, Object value);
177:
178:            /**
179:             * @deprecated
180:             */
181:            public void removeValue(String name);
182:
183:            /**
184:             * logs the user out and invalidates the sessions.
185:             */
186:            // public void logout();
187:        }
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