ComponentViewer


1   /*
2   
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7    Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
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13      this list of conditions and the following disclaimer.
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16      this list of conditions and the following disclaimer in the documentation
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23      and wherever such third-party acknowledgments normally appear.
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25   4. The names "Jakarta", "Avalon", "Excalibur" and "Apache Software Foundation"
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49  */
50  package org.apache.avalon.fortress.examples.viewer;
51  
52  /**
53   * Simple Fortress container containing a Swing based viewer for performing
54   * lookups on registered components.
55   *
56   * <p>
57   * The intention of the viewer is to allow you to perform a lookup of a component
58   * manually, (currently) so you can check the see the effect of lazy vs startup
59   * initialization.
60   * </p>
61   *
62   * <p>
63   * REVISIT: add a text component which tracks the log file to make it easier to
64   * see a component being initialized upon first lookup.
65   * </p>
66   *
67   * @author <a HREF="mailto:crafterm@apache.org">Marcus Crafter</a>
68   * @version CVS $Revision: 1.6 $ $Date: 2003/04/11 07:36:21 $
69   */
70  public final class ComponentViewer
71      extends org.apache.avalon.fortress.impl.DefaultContainer
72      implements org.apache.avalon.framework.activity.Startable, java.awt.event.ActionListener  , Runnable  
73  {
74      // GUI references
75      private javax.swing.JFrame   m_frame;
76      private javax.swing.JComboBox   m_components;
77  
78      /**
79       * Initializes this component. Creates simple Swing GUI containing
80       * available translations for the key 'hello-world'.
81       *
82       * @exception java.lang.Exception if an error occurs
83       */
84      public void initialize()
85          throws Exception  
86      {
87          super.initialize();
88  
89          // create main frame
90          m_frame = new javax.swing.JFrame  ( "Component Viewer" );
91          m_frame.setDefaultCloseOperation( javax.swing.JFrame.EXIT_ON_CLOSE );
92  
93          m_components = new javax.swing.JComboBox  ( getRoles() );
94  
95          javax.swing.JButton   button = new javax.swing.JButton  ( "Lookup!" );
96          button.addActionListener( this );
97  
98          /*
99          // can we output the log data into this text area somehow ?
100         JTextArea logData = new JTextArea();
101         logData.setEditable( false );
102         */
103 
104         javax.swing.JPanel   selectionPanel = new javax.swing.JPanel  ();
105         selectionPanel.add( m_components );
106         selectionPanel.add( button );
107 
108         javax.swing.JPanel   mainPanel = new javax.swing.JPanel  ();
109         mainPanel.setLayout( new javax.swing.BoxLayout  ( mainPanel, javax.swing.BoxLayout.Y_AXIS ) );
110         mainPanel.add( selectionPanel );
111 
112         m_frame.setContentPane( mainPanel );
113         m_frame.pack();
114 
115         // all done
116         if( getLogger().isDebugEnabled() )
117         {
118             getLogger().debug( "Initialized" );
119         }
120     }
121 
122     /**
123      * Helper method to obtain a list of all Roles registered with this container
124      *
125      * @return an array of roles
126      */
127     private Object  [] getRoles()
128     {
129         java.util.Set   keys = m_mapper.keySet();
130         Object  [] roles = new Object  [ keys.size() ];
131         int j = 0;
132 
133         for( java.util.Iterator   i = keys.iterator(); i.hasNext(); )
134         {
135             roles[ j++ ] = i.next();
136         }
137 
138         return roles;
139     }
140 
141     /**
142      * Starts the component, makes GUI visible, ready for use.
143      */
144     public void start()
145     {
146         m_frame.setVisible( true );
147 
148         if( getLogger().isDebugEnabled() )
149         {
150             getLogger().debug( "GUI Activated" );
151         }
152     }
153 
154     /**
155      * Stops component, make GUI invisible, ready for decomissioning.
156      */
157     public void stop()
158     {
159         m_frame.setVisible( false );
160 
161         if( getLogger().isDebugEnabled() )
162         {
163             getLogger().debug( "GUI Disactivated" );
164         }
165     }
166 
167     /**
168      * Handles the <i>lookup</i> event. Finds out which component
169      * was selected and performs a lookup and release on this component.
170      *
171      * @param evt an <code>ActionEvent</code> value
172      */
173     public void actionPerformed( java.awt.event.ActionEvent   evt )
174     {
175         String   selected = (String  )m_components.getSelectedItem();
176 
177         if( getLogger().isDebugEnabled() )
178         {
179             getLogger().debug( "Looking up component " + selected );
180         }
181 
182         Object   component = null;
183 
184         try
185         {
186             component = m_serviceManager.lookup( selected );
187         }
188         catch( org.apache.avalon.framework.service.ServiceException e )
189         {
190             if( getLogger().isWarnEnabled() )
191             {
192                 getLogger().warn( "Error looking up component: " + e.getKey(), e );
193             }
194         }
195         finally
196         {
197             if( component != null ) m_serviceManager.release( component );
198         }
199     }
200 
201     public void run()
202     {
203         while( m_frame.isVisible() )
204         {
205             try
206             {
207                 Thread.sleep( 1000 );
208             }
209             catch( InterruptedException   ie )
210             {
211                 m_frame.setVisible( false );
212             }
213         }
214     }
215 }
216 
217
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