1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * The contents of this file are subject to the terms of the Liferay Enterprise
5    * Subscription License ("License"). You may not use this file except in
6    * compliance with the License. You can obtain a copy of the License by
7    * contacting Liferay, Inc. See the License for the specific language governing
8    * permissions and limitations under the License, including but not limited to
9    * distribution rights of the Software.
10   *
11   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
12   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
14   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
15   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
16   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17   * SOFTWARE.
18   */
19  
20  package com.liferay.portal.kernel.messaging;
21  
22  import com.liferay.portal.kernel.log.Log;
23  import com.liferay.portal.kernel.log.LogFactoryUtil;
24  import com.liferay.portal.kernel.util.NamedThreadFactory;
25  
26  import java.util.List;
27  import java.util.concurrent.LinkedBlockingQueue;
28  import java.util.concurrent.ThreadPoolExecutor;
29  import java.util.concurrent.TimeUnit;
30  
31  /**
32   * <a href="BaseDestination.java.html"><b><i>View Source</i></b></a>
33   *
34   * @author Michael C. Han
35   *
36   */
37  public abstract class BaseDestination implements Destination {
38  
39      public BaseDestination(String name) {
40          this(name, _WORKERS_CORE_SIZE, _WORKERS_MAX_SIZE);
41      }
42  
43      public BaseDestination(
44          String name, int workersCoreSize, int workersMaxSize) {
45  
46          _name = name;
47          _workersCoreSize = workersCoreSize;
48          _workersMaxSize = workersMaxSize;
49  
50          open();
51      }
52  
53      public synchronized void close() {
54          close(false);
55      }
56  
57      public synchronized void close(boolean force) {
58          doClose(force);
59      }
60  
61      public DestinationStatistics getStatistics() {
62          DestinationStatistics statistics = new DestinationStatistics();
63  
64          statistics.setActiveThreadCount(_threadPoolExecutor.getActiveCount());
65          statistics.setCurrentThreadCount(_threadPoolExecutor.getPoolSize());
66          statistics.setLargestThreadCount(
67              _threadPoolExecutor.getLargestPoolSize());
68          statistics.setMaxThreadPoolSize(
69              _threadPoolExecutor.getMaximumPoolSize());
70          statistics.setMinThreadPoolSize(_threadPoolExecutor.getCorePoolSize());
71          statistics.setPendingMessageCount(_threadPoolExecutor.getTaskCount());
72          statistics.setSentMessageCount(
73              _threadPoolExecutor.getCompletedTaskCount());
74  
75          return statistics;
76      }
77  
78      public int getListenerCount() {
79          return _listenerCount;
80      }
81  
82      public String getName() {
83          return _name;
84      }
85  
86      public boolean isRegistered() {
87          if (_listenerCount > 0) {
88              return true;
89          }
90          else {
91              return false;
92          }
93      }
94  
95      public synchronized void open() {
96          doOpen();
97      }
98  
99      protected void doClose(boolean force) {
100         if (!_threadPoolExecutor.isShutdown() &&
101             !_threadPoolExecutor.isTerminating()) {
102 
103             if (!force) {
104                 _threadPoolExecutor.shutdown();
105             }
106             else {
107                 List<Runnable> pendingTasks = _threadPoolExecutor.shutdownNow();
108 
109                 if (_log.isInfoEnabled()) {
110                     _log.info(
111                         "The following " + pendingTasks.size() + " tasks " +
112                             "were not executed due to shutown: " +
113                                 pendingTasks);
114                 }
115             }
116         }
117     }
118 
119     protected void doOpen() {
120         if ((_threadPoolExecutor == null) || _threadPoolExecutor.isShutdown()) {
121             _threadPoolExecutor = new ThreadPoolExecutor(
122                 _workersCoreSize, _workersMaxSize, 0L, TimeUnit.MILLISECONDS,
123                 new LinkedBlockingQueue<Runnable>(),
124                 new NamedThreadFactory(getName(), Thread.NORM_PRIORITY));
125         }
126     }
127 
128     protected ThreadPoolExecutor getThreadPoolExecutor() {
129         return _threadPoolExecutor;
130     }
131 
132     protected int getWorkersCoreSize() {
133         return _workersCoreSize;
134     }
135 
136     protected int getWorkersMaxSize() {
137         return _workersMaxSize;
138     }
139 
140     protected void setListenerCount(int listenerCount) {
141         _listenerCount = listenerCount;
142     }
143 
144     private static final int _WORKERS_CORE_SIZE = 5;
145 
146     private static final int _WORKERS_MAX_SIZE = 10;
147 
148     private static Log _log = LogFactoryUtil.getLog(BaseDestination.class);
149 
150     private String _name;
151     private ThreadPoolExecutor _threadPoolExecutor;
152     private int _workersCoreSize;
153     private int _workersMaxSize;
154     private int _listenerCount;
155 
156 }