ForkManagerImpl


1   /*====================================================================
2   
3   OpenCCM: The Open CORBA Component Model Platform
4   Copyright (C) 2000-2002 USTL - LIFL - GOAL
5   Contact: openccm-team@objectweb.org
6   
7   This library is free software; you can redistribute it and/or
8   modify it under the terms of the GNU Lesser General Public
9   License as published by the Free Software Foundation; either
10  version 2.1 of the License, or any later version.
11  
12  This library is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  Lesser General Public License for more details.
16  
17  You should have received a copy of the GNU Lesser General Public
18  License along with this library; if not, write to the Free Software
19  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
20  USA
21  
22  Initial developer(s): Philippe Merle, Sylvain Leblanc.
23  Contributor(s): Christophe Demarey.
24  
25  ====================================================================*/
26  
27  package DiningPhilosophers.monolithic;
28  
29  import DiningPhilosophers.*;
30  
31  /**
32   * This is the implementation of the OMG IDL3
33   * DiningPhilosophers::ForkManager component type.
34   *
35   * This class inherits from the local CCM_ForkManager interface
36   * generated by the OpenCCM's IDL3 to IDL2 mapping generator.
37   *
38   * The provided the_fork facet is directly implemented by the
39   * component class by implementing the DiningPhilosophers::Fork interface.
40   *
41   * @author <a HREF="mailto:Philippe.Merle@lifl.fr">Philippe Merle</a> 
42   * @author <a HREF="mailto:Sylvain.Leblanc@lifl.fr">Sylvain Leblanc</a> 
43   * @author <a HREF="mailto:Christophe.Demarey@lifl.fr">Christophe Demarey</a>
44   *
45   * @version 2.0
46   */
47  
48  public class ForkManagerImpl
49       extends org.omg.CORBA.LocalObject  
50    implements CCM_ForkManager,
51               CCM_Fork,
52               org.omg.Components.SessionComponent
53  {
54      // ==================================================================
55      //
56      // Internal state.
57      //
58      // ==================================================================
59  
60      /** Tells if the fork is available. */
61      private boolean available_;
62  
63      /** The fork manager CCM context. */
64      private CCM_ForkManager_Context the_context_;
65  
66      // ==================================================================
67      //
68      // Constructor.
69      //
70      // ==================================================================
71  
72      /** The default constructor. */
73      public
74      ForkManagerImpl()
75      {
76          available_ = true;
77      }
78  
79      // ==================================================================
80      //
81      // Internal methods.
82      //
83      // ==================================================================
84  
85      // ==================================================================
86      //
87      // Public methods.
88      //
89      // ==================================================================
90  
91      // ==================================================================
92      //
93      // Methods for OMG IDL Components::EnterpriseComponent
94      //
95      // ==================================================================
96  
97      /**
98       * Complete the component configuration.
99       *
100      * @exception org.omg.Components.InvalidConfiguration
101      *            Thrown if the configuration is invalid.     
102      */
103     public void
104     configuration_complete()
105     throws org.omg.Components.InvalidConfiguration
106     {
107         // Nothing to do.
108     }
109 
110     // ==================================================================
111     //
112     // Methods for the OMG IDL org.omg.Components.SessionComponent
113     //
114     // ==================================================================
115 
116     /**
117      * Setting the session component context.
118      *
119      * @param context The session component context.
120      */
121     public void
122     set_session_context(org.omg.Components.SessionContext context)
123     throws org.omg.Components.CCMException
124     {
125         the_context_ = (CCM_ForkManager_Context)context;
126     }
127 
128     /**
129      * Container callback to signal that the component is activated.
130      *
131      * @throw org.omg.Components.CCMException For any problems.
132      */
133     public void
134     ccm_activate()
135     throws org.omg.Components.CCMException
136     {
137         // Nothing to do currently.
138     }
139 
140     /**
141      * Container callback to signal that the component is activated.
142      *
143      * @throw org.omg.Components.CCMException For any problems.
144      */
145     public void
146     ccm_passivate()
147     throws org.omg.Components.CCMException
148     {
149         // Nothing to do currently.
150     }
151 
152     /**
153      * Container callback to signal that the component is removed.
154      *
155      * @throw org.omg.Components.CCMException For any problems.
156      */
157     public void
158     ccm_remove()
159     throws org.omg.Components.CCMException
160     {
161         // Nothing to do currently.
162     }
163 
164     // ==================================================================
165     //
166     // Methods for OMG IDL DiningPhilosophers::CCM_ForkManager
167     //
168     // ==================================================================
169 
170     /**
171      * The component must provide the executor object implementing
172      * the the_fork Facet.
173      */
174     public CCM_Fork
175     get_the_fork()
176     {
177         // Returns the component because it implements the Fork facet.
178         return this;
179     }
180 
181     // ==================================================================
182     //
183     // Methods for OMG IDL DiningPhilosophers::Fork
184     //
185     // ==================================================================
186 
187     /**
188      * Obtain the fork.
189      *
190      * @exception InUse
191      *            Thrown if the fork has already used by another philosopher.
192      */
193     public void
194     get() 
195     throws InUse
196     {
197         // Check if there is no current philosopher.
198         if (! available_) 
199         {
200             throw new InUse();
201         }
202 
203         // The philosopher is now the current fork user.
204         available_ = false;
205     }
206 
207     /**
208      * Release the fork.
209      */
210     public void
211     release()
212     {
213         // Check if the philosopher is the current one.
214         if (available_) 
215         {
216             return;
217         }
218 
219         // There is no current fork user.
220         available_ = true;        
221     }
222 }
223
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