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Java > Open Source Codes > org > openlaszlo > iv > flash > cache > RequestCache


1 /*
2  * $Id: RequestCache.java,v 1.3 2002/03/22 04:55:07 skavish Exp $
3  *
4  * ==========================================================================
5  *
6  * The JGenerator Software License, Version 1.0
7  *
8  * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if
22  * any, must include the following acknowlegement:
23  * "This product includes software developed by Dmitry Skavish
24  * (skavish@usa.net, http://www.flashgap.com/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
27  *
28  * 4. The name "The JGenerator" must not be used to endorse or promote
29  * products derived from this software without prior written permission.
30  * For written permission, please contact skavish@usa.net.
31  *
32  * 5. Products derived from this software may not be called "The JGenerator"
33  * nor may "The JGenerator" appear in their names without prior written
34  * permission of Dmitry Skavish.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
40  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  *
49  */
50
51 package org.openlaszlo.iv.flash.cache;
52
53 import org.openlaszlo.iv.flash.api.*;
54 import org.openlaszlo.iv.flash.util.*;
55 import java.util.*;
56
57 public class RequestCache extends GenericCache {
58
59     private static RequestCache instance = new RequestCache();
60
61     private RequestCache() {
62     }
63
64     public static RequestCache getInstance() {
65         return instance;
66     }
67
68     public static CacheSettings getSettings() {
69         return instance.getMySettings();
70     }
71
72     /**
73      * Get cached request
74      *
75      * @param key cache key
76      */
77      public static FlashOutput getRequest( String JavaDoc key ) {
78         CacheItem item = instance.getItem( key );
79         if( item == null ) return null;
80         return (FlashOutput) item.getObject();
81      }
82
83     /**
84      * Add request to cache
85      *
86      * @param key cache key
87      * @param fob FlashOutput object to add
88      * @param lifespan time in milliseconds after which the request will be expired
89      */
90     public static void addRequest( String JavaDoc key, FlashOutput fob, long lifespan ) {
91         long now = System.currentTimeMillis();
92         if( lifespan < 0 ) {
93             lifespan = getSettings().getDefaultExpire();
94         }
95         if( lifespan == 0 ) {
96             lifespan = Long.MAX_VALUE-now;
97         }
98         long expire = now + lifespan;
99         CacheItem item = new CacheItem( key, fob, fob.getSize(), now, expire );
100         instance.addItem( item );
101     }
102
103 }
104
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