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1
48
49 package com.caucho.portal.generic;
50
51 import javax.servlet.http.HttpSession  ;
52 import javax.servlet.http.HttpSessionActivationListener ;
53 import javax.servlet.http.HttpSessionBindingEvent ;
54 import javax.servlet.http.HttpSessionBindingListener ;
55 import javax.servlet.http.HttpSessionEvent ;
56 import java.lang.ref.WeakReference ;
57 import java.util.LinkedHashMap ;
58
59 public class SessionPreferences
60 extends LinkedHashMap <String , String []>
61 implements java.io.Serializable ,
62 HttpSessionBindingListener , HttpSessionActivationListener
63 {
64 transient WeakReference _sessionRef;
65 transient private boolean _isUpdateNeeded;
66
67 private String _sessionAttributeName;
68
69 public SessionPreferences()
70 {
71 }
72
73 public void valueBound(HttpSessionBindingEvent event)
74 {
75 if (_sessionRef == null) {
76 _sessionRef = new WeakReference (event.getSession());
77 _sessionAttributeName = event.getName();
78 }
79 }
80
81 public void valueUnbound(HttpSessionBindingEvent event)
82 {
83 _sessionRef = null;
84 _sessionAttributeName = null;
85 }
86
87 public void sessionDidActivate(HttpSessionEvent event)
88 {
89 _sessionRef = new WeakReference (event.getSession());
90 }
91
92 public void sessionWillPassivate(HttpSessionEvent event)
93 {
94 }
95
96 public String [] put(String key, String [] value)
97 {
98 _isUpdateNeeded = true;
99 return super.put(key, value);
100 }
101
102 void updateSessionIfNeeded()
103 {
104 if (_isUpdateNeeded) {
105 if (_sessionRef != null) {
106 HttpSession session = (HttpSession ) _sessionRef.get();
107
108 if (session != null) {
109 synchronized (session) {
110 session.setAttribute(_sessionAttributeName, this);
111 _isUpdateNeeded = false;
112 }
113 }
114 }
115 }
116 }
117 }
118
119 |
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