MonitoringComponentAdapterFactory


1   /*****************************************************************************
2    * Copyright (C) PicoContainer Organization. All rights reserved.            *
3    * ------------------------------------------------------------------------- *
4    * The software in this package is published under the terms of the BSD      *
5    * style license a copy of which has been included with this distribution in *
6    * the LICENSE.txt file.                                                     *
7    *                                                                           *
8    * Original code by Mauro Talevi                                             *
9    *****************************************************************************/
10  package org.picocontainer.defaults;
11  
12  import java.io.Serializable  ;
13  
14  import org.picocontainer.ComponentMonitor;
15  
16  /**
17   * Abstract {@link ComponentAdapterFactory ComponentAdapterFactory} supporting a 
18   * {@link ComponentMonitorStrategy ComponentMonitorStrategy}.
19   * It provides a {@link DelegatingComponentMonitor default ComponentMonitor},
20   * but does not allow to use <code>null</code> for the component monitor.
21   *  
22   * @author Mauro Talevi
23   * @see ComponentAdapterFactory
24   * @see ComponentMonitorStrategy
25   * @since 1.2
26   */
27  public abstract class MonitoringComponentAdapterFactory implements ComponentAdapterFactory, ComponentMonitorStrategy, Serializable   {
28      private ComponentMonitor componentMonitor;
29  
30      /**
31       * Constructs a MonitoringComponentAdapterFactory with a custom monitor 
32       * @param monitor the ComponentMonitor used by the factory
33       */
34      protected MonitoringComponentAdapterFactory(ComponentMonitor monitor) {
35          if (monitor == null){
36              throw new NullPointerException  ("componentMonitor");
37          }
38          this.componentMonitor = monitor;
39      }
40  
41      /**
42       * Constructs a  MonitoringComponentAdapterFactory with a {@link DelegatingComponentMonitor default monitor}.
43       */
44      protected MonitoringComponentAdapterFactory() {
45          this(new DelegatingComponentMonitor());
46      }
47      
48      public void changeMonitor(ComponentMonitor monitor) {
49          this.componentMonitor = monitor;
50      }
51  
52      /**
53       * Returns the monitor currently used
54       * @return The ComponentMonitor currently used
55       */
56      public ComponentMonitor currentMonitor(){
57          return componentMonitor;
58      }
59  
60  }
61
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