01: /*
02:
03: Derby - Class org.apache.derby.impl.services.cache.ClockFactory
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (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;
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 CacheTrace = SanityManager.DEBUG ? "CacheTrace"
46: : null;
47:
48: public ClockFactory() {
49: }
50:
51: /*
52: ** Methods of CacheFactory
53: */
54:
55: public CacheManager newCacheManager(CacheableFactory holderFactory,
56: String name, int initialSize, int maximumSize) {
57:
58: if (initialSize <= 0)
59: initialSize = 1;
60:
61: return new Clock(holderFactory, name, initialSize, maximumSize,
62: false);
63: }
64:
65: public CacheManager newSizedCacheManager(
66: CacheableFactory holderFactory, String name,
67: int initialSize, long maximumSize) {
68:
69: if (initialSize <= 0)
70: initialSize = 1;
71:
72: return new Clock(holderFactory, name, initialSize, maximumSize,
73: true);
74: }
75: }
|