1 /***
2 * Copyright 2003-2010 Terracotta, Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package net.sf.ehcache.constructs.nonstop;
18
19 import java.util.HashMap;
20 import java.util.Map;
21 import java.util.concurrent.ThreadFactory;
22 import java.util.concurrent.atomic.AtomicInteger;
23
24 import net.sf.ehcache.CacheManager;
25
26 /***
27 * {@link NonstopExecutorServiceFactory} that creates and maintains one per CacheManager
28 *
29 * @author Abhishek Sanoujam
30 *
31 */
32 public final class CacheManagerExecutorServiceFactory implements NonstopExecutorServiceFactory {
33
34 /***
35 * A string that is a part of the thread name created by the default thread factory.
36 */
37 private static final String EXECUTOR_THREAD_NAME_PREFIX = "Executor Thread";
38
39 private static final CacheManagerExecutorServiceFactory SINGLETON = new CacheManagerExecutorServiceFactory();
40
41 private final Map<String, NonstopExecutorService> executorServiceMap = new HashMap<String, NonstopExecutorService>();
42
43 /***
44 * private constructor
45 */
46 private CacheManagerExecutorServiceFactory() {
47
48 }
49
50 /***
51 * Returns the singleton instance
52 *
53 * @return the singleton instance
54 */
55 public static CacheManagerExecutorServiceFactory getInstance() {
56 return SINGLETON;
57 }
58
59 /***
60 * {@inheritDoc}
61 */
62 public NonstopExecutorService getOrCreateNonstopExecutorService(final CacheManager cacheManager) {
63 final String cacheManagerName = cacheManager.getName();
64 synchronized (executorServiceMap) {
65 NonstopExecutorService rv = executorServiceMap.get(cacheManagerName);
66 if (rv == null) {
67 rv = new NonstopExecutorServiceImpl(new ThreadFactory() {
68 private final AtomicInteger count = new AtomicInteger();
69
70 public Thread newThread(Runnable runnable) {
71 Thread thread = new Thread(runnable, "NonStopCache [" + cacheManagerName + "] " + EXECUTOR_THREAD_NAME_PREFIX + "-"
72 + count.incrementAndGet() + " for '" + Thread.currentThread().getName() + "'");
73 thread.setDaemon(true);
74 return thread;
75 }
76 });
77 executorServiceMap.put(cacheManagerName, rv);
78 }
79 return rv;
80 }
81 }
82
83 /***
84 * {@inheritDoc}
85 */
86 public void shutdown(final CacheManager cacheManager) {
87 synchronized (executorServiceMap) {
88 NonstopExecutorService executorService = executorServiceMap.remove(cacheManager.getName());
89 if (executorService != null) {
90 executorService.shutdown();
91 }
92 }
93
94 }
95
96 }