|
1 package org.hibernate.cache;
3
4 import java.util.Properties  ;
5
6 import org.hibernate.HibernateException;
7 import org.hibernate.MappingException;
8 import org.hibernate.cfg.Settings;
9 import org.apache.commons.logging.Log;
10 import org.apache.commons.logging.LogFactory;
11
12
15 public final class CacheFactory {
16
17 private static final Log log = LogFactory.getLog(CacheFactory.class);
18
19 private CacheFactory() {}
20
21 public static final String READ_ONLY = "read-only";
22 public static final String READ_WRITE = "read-write";
23 public static final String NONSTRICT_READ_WRITE = "nonstrict-read-write";
24 public static final String TRANSACTIONAL = "transactional";
25
26 public static CacheConcurrencyStrategy createCache(
27 final String concurrencyStrategy,
28 String regionName,
29 final boolean mutable,
30 final Settings settings,
31 final Properties properties)
32 throws HibernateException {
33
34 if ( concurrencyStrategy==null || !settings.isSecondLevelCacheEnabled() ) return null;
36 String prefix = settings.getCacheRegionPrefix();
37 if ( prefix!=null ) regionName = prefix + '.' + regionName;
38
39 if ( log.isDebugEnabled() ) log.debug("instantiating cache region: " + regionName + " usage strategy: " + concurrencyStrategy);
40
41 final CacheConcurrencyStrategy ccs;
42 if ( concurrencyStrategy.equals(READ_ONLY) ) {
43 if (mutable) log.warn( "read-only cache configured for mutable class: " + regionName );
44 ccs = new ReadOnlyCache();
45 }
46 else if ( concurrencyStrategy.equals(READ_WRITE) ) {
47 ccs = new ReadWriteCache();
48 }
49 else if ( concurrencyStrategy.equals(NONSTRICT_READ_WRITE) ) {
50 ccs = new NonstrictReadWriteCache();
51 }
52 else if ( concurrencyStrategy.equals(TRANSACTIONAL) ) {
53 ccs = new TransactionalCache();
54 }
55 else {
56 throw new MappingException("cache usage attribute should be read-write, read-only, nonstrict-read-write or transactional");
57 }
58
59 final Cache impl;
60 try {
61 impl = settings.getCacheProvider().buildCache(regionName, properties);
62 }
63 catch (CacheException e) {
64 throw new HibernateException( "Could not instantiate cache implementation", e );
65 }
66 ccs.setCache(impl);
67
68 return ccs;
69 }
70
71 }
72 |
Popular Tags |
Java API By Example, From Geeks To Geeks.