1 package org.apache.jcs.engine;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.io.Serializable;
23 import java.util.Collections;
24 import java.util.Map;
25 import java.util.Set;
26
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import org.apache.jcs.engine.behavior.ICacheElement;
30 import org.apache.jcs.engine.behavior.ICacheService;
31 import org.apache.jcs.engine.behavior.IZombie;
32
33 /**
34 * Zombie adapter for any cache service. Balks at every call.
35 */
36 public class ZombieCacheService
37 implements ICacheService, IZombie
38 {
39 /** The logger. */
40 private static final Log log = LogFactory.getLog( ZombieCacheService.class );
41
42 /**
43 * @param item
44 */
45 public void put( ICacheElement item )
46 {
47 if ( log.isDebugEnabled() )
48 {
49 log.debug( "Zombie put for item " + item );
50 }
51 // zombies have no inner life
52 }
53
54 /**
55 * Does nothing.
56 * <p>
57 * @param item
58 */
59 public void update( ICacheElement item )
60 {
61 // zombies have no inner life
62 }
63
64 /**
65 * @param cacheName
66 * @param key
67 * @return null. zombies have no internal data
68 */
69 public ICacheElement get( String cacheName, Serializable key )
70 {
71 return null;
72 }
73
74 /**
75 * Returns an empty map. Zombies have no internal data.
76 * <p>
77 * @param cacheName
78 * @param keys
79 * @return Collections.EMPTY_MAP
80 */
81 public Map<Serializable, ICacheElement> getMultiple( String cacheName, Set<Serializable> keys )
82 {
83 return Collections.emptyMap();
84 }
85
86 /**
87 * Returns an empty map. Zombies have no internal data.
88 * <p>
89 * @param cacheName
90 * @param pattern
91 * @return Collections.EMPTY_MAP
92 */
93 public Map<Serializable, ICacheElement> getMatching( String cacheName, String pattern )
94 {
95 return Collections.emptyMap();
96 }
97
98 /**
99 * Logs the get to debug, but always balks.
100 * <p>
101 * @param cacheName
102 * @param key
103 * @param container
104 * @return null always
105 */
106 public Serializable get( String cacheName, Serializable key, boolean container )
107 {
108 if ( log.isDebugEnabled() )
109 {
110 log.debug( "Zombie get for key [" + key + "] cacheName [" + cacheName + "] container [" + container + "]" );
111 }
112 // zombies have no inner life
113 return null;
114 }
115
116 /**
117 * @param cacheName
118 * @param key
119 */
120 public void remove( String cacheName, Serializable key )
121 {
122 // zombies have no inner life
123 }
124
125 /**
126 * @param cacheName
127 */
128 public void removeAll( String cacheName )
129 {
130 // zombies have no inner life
131 }
132
133 /**
134 * @param cacheName
135 */
136 public void dispose( String cacheName )
137 {
138 // zombies have no inner life
139 }
140
141 /**
142 * Frees all caches.
143 */
144 public void release()
145 {
146 // zombies have no inner life
147 }
148 }