1 /**
2  *  Copyright 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 NonstopThread(runnable, "NonStopCache [" + cacheManagerName + "] "
72                                 + EXECUTOR_THREAD_NAME_PREFIX + "-" + count.incrementAndGet() + " for '" + Thread.currentThread().getName()
73                                 + "'");
74                         thread.setDaemon(true);
75                         return thread;
76                     }
77                 });
78                 executorServiceMap.put(cacheManagerName, rv);
79             }
80             return rv;
81         }
82     }
83
84     /**
85      * {@inheritDoc}
86      */
87     public void shutdown(final CacheManager cacheManager) {
88         synchronized (executorServiceMap) {
89             NonstopExecutorService executorService = executorServiceMap.remove(cacheManager.getName());
90             if (executorService != null) {
91                 executorService.shutdown();
92             }
93         }
94
95     }
96
97 }
98