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Java > Open Source Codes > tutorial > DemonstratableProvider


1 /*
2  * Copyright 2004 Apache Software Foundation
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
12  * implied.
13  *
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 package tutorial;
19
20 import org.apache.avalon.composition.model.LifecycleCreateExtension;
21 import org.apache.avalon.composition.model.ComponentModel;
22
23 import org.apache.avalon.framework.activity.Disposable;
24 import org.apache.avalon.framework.activity.Initializable;
25 import org.apache.avalon.framework.context.Context;
26 import org.apache.avalon.framework.logger.AbstractLogEnabled;
27
28 import org.apache.avalon.meta.info.StageDescriptor;
29
30 /**
31  * Definition of an extension type that logs messages related to
32  * all lifestyle stages.
33  *
34  * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
35  * @avalon.component name="extension" version="1.0" lifestyle="singleton"
36  * @avalon.extension id="urn:demo:demonstratable"
37  */
38 public class DemonstratableProvider extends AbstractLogEnabled
39         implements LifecycleCreateExtension
40 {
41
42     //=======================================================================
43 // LifecycleCreateExtension
44 //=======================================================================
45
46     /**
47      * Invocation of the deployment creation stage extension.
48      * @param model the model representing the object under deployment
49      * @param stage the extension stage descriptor
50      * @param object the object under deployment
51      * @exception if a deployment error occurs
52      */
53      public void create( ComponentModel model, StageDescriptor stage, Object JavaDoc object )
54        throws Exception JavaDoc
55      {
56          getLogger().info( "invoking create on target: " + model );
57          if( object instanceof Demonstratable )
58          {
59             ((Demonstratable)object).demo( "creator id: " + System.identityHashCode( this ) );
60          }
61      }
62 }
63
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