| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.services.cache.ClockFactory |
| 4 | |
| 5 | Copyright 1997, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.services.cache; |
| 22 | |
| 23 | import org.apache.derby.iapi.services.cache.CacheFactory; |
| 24 | import org.apache.derby.iapi.services.cache.CacheManager; |
| 25 | import org.apache.derby.iapi.services.cache.Cacheable; |
| 26 | import org.apache.derby.iapi.services.cache.CacheableFactory; |
| 27 | |
| 28 | import org.apache.derby.iapi.error.StandardException; |
| 29 | |
| 30 | import org.apache.derby.iapi.services.sanity.SanityManager; |
| 31 | |
| 32 | import java.util.Properties; |
| 33 | |
| 34 | /** |
| 35 | Multithreading considerations: no need to be MT-safe, caller (module control) |
| 36 | provides synchronization. Besides, this class is stateless. |
| 37 | */ |
| 38 | |
| 39 | public class ClockFactory implements CacheFactory { |
| 40 | |
| 41 | /** |
| 42 | Trace flag to display cache statistics |
| 43 | */ |
| 44 | public static final String CacheTrace = SanityManager.DEBUG ? "CacheTrace" : null; |
| 45 | |
| 46 | public ClockFactory() { |
| 47 | } |
| 48 | |
| 49 | |
| 50 | |
| 51 | /* |
| 52 | ** Methods of CacheFactory |
| 53 | */ |
| 54 | |
| 55 | public CacheManager newCacheManager(CacheableFactory holderFactory, String name, int initialSize, int maximumSize) |
| 56 | { |
| 57 | |
| 58 | if (initialSize <= 0) |
| 59 | initialSize = 1; |
| 60 | |
| 61 | return new Clock(holderFactory, name, initialSize, maximumSize, false); |
| 62 | } |
| 63 | |
| 64 | public CacheManager newSizedCacheManager(CacheableFactory holderFactory, String name, |
| 65 | int initialSize, long maximumSize) |
| 66 | { |
| 67 | |
| 68 | if (initialSize <= 0) |
| 69 | initialSize = 1; |
| 70 | |
| 71 | return new Clock(holderFactory, name, initialSize, maximumSize, true); |
| 72 | } |
| 73 | } |