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1   /*** 
2    * 
3    * Copyright 2004 Protique Ltd
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License"); 
6    * you may not use this file except in compliance with the License. 
7    * You may obtain a copy of the License at 
8    * 
9    * http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS, 
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
14   * See the License for the specific language governing permissions and 
15   * limitations under the License. 
16   * 
17   **/
18  package org.codehaus.activemq.transport.ember;
19  
20  import pyrasun.eio.EIOEvent;
21  import pyrasun.eio.EIOEventDescriptor;
22  import pyrasun.eio.EIOGlobalContext;
23  import pyrasun.eio.EIOPoolingStrategy;
24  import pyrasun.eio.services.EmberServiceController;
25  import pyrasun.eio.services.EmberServiceControllerImpl;
26  
27  import javax.jms.JMSException;
28  import java.io.IOException;
29  
30  /***
31   * An abstract base class useful for implementation inheritence
32   * 
33   * @version $Revision: 1.7 $
34   */
35  public class EmberSupport {
36  
37      private EIOGlobalContext context;
38      private String key = "emberIo";
39      private int maxEm = 1;
40      private EmberServiceControllerImpl controller;
41      private EIOPoolingStrategy ioPoolingStrategy;
42  
43      /***
44       * TODO when EmberIO can support flushing when in NIO mode
45       */
46      //private String poolingStrategyName = "USE_RWP_POOLS";
47  
48      private String poolingStrategyName = "SELECTOR_READER";
49  
50      public EmberSupport() {
51      }
52  
53      public EmberSupport(EIOGlobalContext context, EIOPoolingStrategy ioPoolingStrategy) {
54          this.context = context;
55          this.ioPoolingStrategy = ioPoolingStrategy;
56      }
57  
58      public EIOGlobalContext getContext() throws IOException {
59          if (context == null) {
60              context = new EIOGlobalContext(maxEm, key);
61          }
62          return context;
63      }
64  
65      public String getKey() {
66          return key;
67      }
68  
69      protected EmberServiceController getController() throws IOException {
70          if (controller == null) {
71              controller = new EmberServiceControllerImpl(getContext());
72          }
73          return controller;
74      }
75  
76      protected EIOPoolingStrategy getIoPoolingStrategy() {
77          if (ioPoolingStrategy == null) {
78              ioPoolingStrategy = getPoolingStrategyByName(poolingStrategyName);
79          }
80          return ioPoolingStrategy;
81      }
82  
83      protected EIOPoolingStrategy getPoolingStrategyByName(String name) {
84          EIOPoolingStrategy strategy = EIOPoolingStrategy.getStrategyByName(name);
85  
86          // lets default some pool sizes
87          EIOEventDescriptor evRead = strategy.getEventDescriptor(EIOEvent.READ);
88          evRead.setPoolSize(1);
89  
90          EIOEventDescriptor evWrite = strategy.getEventDescriptor(EIOEvent.WRITE);
91          evWrite.setPoolSize(1);
92  
93          EIOEventDescriptor evProcess = strategy.getEventDescriptor(EIOEvent.PROCESS);
94          evProcess.setPoolSize(1);
95          return strategy;
96      }
97  
98      /***
99       * Factory method to create a JMSException which is linked to the base exception
100      */
101     protected JMSException createJMSException(String message, Exception ex) {
102         JMSException jmsEx = new JMSException(message + ex.getMessage());
103         jmsEx.setLinkedException(ex);
104         return jmsEx;
105     }
106 
107 }