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Java > Open Source Codes > com > sun > ejb > containers > util > cache > PassivatedSessionCache


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23
24 package com.sun.ejb.containers.util.cache;
25
26 public class PassivatedSessionCache
27     extends LruCache
28 {
29
30     /**
31      * default constructor
32      */
33     public PassivatedSessionCache() {
34         super();
35     }
36
37     /**
38      * constructor with specified timeout
39      */
40     public PassivatedSessionCache(long timeout) {
41         super(timeout);
42     }
43
44     /**
45      * this item is just added to the cache
46      * @param item <code>CacheItem</code> that was created
47      * @return a overflow item; may be null
48      *
49      * Cache bucket is already synchronized by the caller
50      */
51     protected CacheItem itemAdded(CacheItem item) {
52         CacheItem overflow = null;
53         LruCacheItem lc = (LruCacheItem) item;
54
55         // set the timestamp
56 lc.lastAccessed = ((Long JavaDoc) item.value).longValue();
57
58         // update the LRU
59 synchronized (this) {
60             if (head != null) {
61                 head.lPrev = lc;
62                 lc.lNext = head;
63             }
64             else {
65                 tail = lc;
66             }
67             head = lc;
68
69             listSize++;
70
71         }
72
73         return overflow;
74     }
75
76     protected boolean isThresholdReached() {
77         return false;
78     }
79
80 }
81
82
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