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Java > Open Source Codes > org > apache > derby > impl > services > cache > ClockFactory


1 /*
2
3    Derby - Class org.apache.derby.impl.services.cache.ClockFactory
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    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, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20  */
21
22 package org.apache.derby.impl.services.cache;
23
24 import org.apache.derby.iapi.services.cache.CacheFactory;
25 import org.apache.derby.iapi.services.cache.CacheManager;
26 import org.apache.derby.iapi.services.cache.Cacheable;
27 import org.apache.derby.iapi.services.cache.CacheableFactory;
28
29 import org.apache.derby.iapi.error.StandardException;
30
31 import org.apache.derby.iapi.services.sanity.SanityManager;
32
33 import java.util.Properties JavaDoc;
34
35 /**
36   Multithreading considerations: no need to be MT-safe, caller (module control)
37   provides synchronization. Besides, this class is stateless.
38 */
39
40 public class ClockFactory implements CacheFactory {
41
42     /**
43         Trace flag to display cache statistics
44     */
45     public static final String JavaDoc CacheTrace = SanityManager.DEBUG ? "CacheTrace" : null;
46
47     public ClockFactory() {
48     }
49
50
51
52     /*
53     ** Methods of CacheFactory
54     */
55
56     public CacheManager newCacheManager(CacheableFactory holderFactory, String JavaDoc name, int initialSize, int maximumSize)
57     {
58
59         if (initialSize <= 0)
60             initialSize = 1;
61
62         return new Clock(holderFactory, name, initialSize, maximumSize, false);
63     }
64     
65     public CacheManager newSizedCacheManager(CacheableFactory holderFactory, String JavaDoc name,
66                                         int initialSize, long maximumSize)
67     {
68
69         if (initialSize <= 0)
70             initialSize = 1;
71
72         return new Clock(holderFactory, name, initialSize, maximumSize, true);
73     }
74 }
75
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