I need to get all active sessions from servlet.
But I believe this API is obsolated…
That is why, I tried to implement using existing API.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | package jp.develop.tool.servlet;import java.io.Serializable;import java.util.ArrayList;import java.util.Collections;import java.util.List;import javax.servlet.http.HttpSession;import javax.servlet.http.HttpSessionActivationListener;import javax.servlet.http.HttpSessionEvent;import javax.servlet.http.HttpSessionListener;/** * Session list providing Listener. */public class SessionListListener implements HttpSessionListener, HttpSessionActivationListener, Serializable { private static final boolean DEBUG = true; private static final long serialVersionUID = 7490899888824580726L; private static final String SESSION_LISTENER_KEY = "_sessionListListener"; private static Object lock = new Object(); private static List<httpsession> sessions = new ArrayList<httpsession>(); private static List<httpsession> sessionsForOutput = Collections.unmodifiableList(sessions); /** * Get all sessions. * @return All sessions list. */ public static List<httpsession> getSessions() { return sessionsForOutput; } /** * Default Constructor. */ public SessionListListener() { log(String.format("Session List Listener is initialized.")); } /** * @see HttpSessionListener#sessionCreated(HttpSessionEvent) */ public void sessionCreated(HttpSessionEvent event) { synchronized (lock) { HttpSession session = event.getSession(); session.setAttribute(SESSION_LISTENER_KEY, this); sessions.add(session); log(String.format("Session Added: %s", session.getId())); } } /** * @see HttpSessionListener#sessionDestroyed(HttpSessionEvent) */ public void sessionDestroyed(HttpSessionEvent event) { synchronized (lock) { HttpSession session = event.getSession(); session.removeAttribute(SESSION_LISTENER_KEY); sessions.remove(session); // XXX May not good implementation for performance. log(String.format("Session Removed: %s", session.getId())); } } /** * @see HttpSessionActivationListener#sessionDidActivate(HttpSessionEvent) */ public void sessionDidActivate(HttpSessionEvent event) { synchronized (lock) { HttpSession session = event.getSession(); sessions.add(session); log(String.format("Session Activate: %s", session.getId())); } } /** * @see HttpSessionActivationListener#sessionWillPassivate(HttpSessionEvent) */ public void sessionWillPassivate(HttpSessionEvent event) { synchronized (lock) { HttpSession session = event.getSession(); sessions.remove(session); // XXX May not good implementation for performance. log(String.format("Session Passivate: %s", session.getId())); } } private static void log(String message) { if (DEBUG) { System.out.println(message); } }}</httpsession></httpsession></httpsession></httpsession> |
If anybody find a problem, please let me know…
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