BeanContextServiceProvider


1   /*
2    * @(#)BeanContextServiceProvider.java  1.10 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.beans.beancontext;
9   
10  import java.util.Iterator  ;
11  
12  /**
13   * <p>
14   * One of the primary functions of a BeanContext is to act a as rendezvous 
15   * between JavaBeans, and BeanContextServiceProviders.
16   * </p>
17   * <p>
18   * A JavaBean nested within a BeanContext, may ask that BeanContext to 
19   * provide an instance of a "service", based upon a reference to a Java
20   * Class object that represents that service.
21   * </p>
22   * <p>
23   * If such a service has been registered with the context, or one of its 
24   * nesting context's, in the case where a context delegate to its context
25   * to satisfy a service request, then the BeanContextServiceProvider associated with 
26   * the service is asked to provide an instance of that service.
27   * </p>
28   * <p>
29   * The ServcieProvider may always return the same instance, or it may
30   * construct a new instance for each request.
31   * </p>
32   */
33  
34  public interface BeanContextServiceProvider {
35  
36     /**
37      * Invoked by <code>BeanContextServices</code>, this method 
38      * requests an instance of a
39      * service from this <code>BeanContextServiceProvider</code>. 
40      * 
41      * @param bcs The <code>BeanContextServices</code> associated with this
42      * particular request. This parameter enables the
43      * <code>BeanContextServiceProvider</code> to distinguish service 
44      * requests from multiple sources.
45      *
46      * @param requestor      The object requesting the service
47      *
48      * @param serviceClass   The service requested
49      *
50      * @param serviceSelector the service dependent parameter 
51      * for a particular service, or <code>null</code> if not applicable.
52      * 
53      * @return a reference to the requested service
54      */
55      Object   getService(BeanContextServices   bcs, Object   requestor, Class   serviceClass, Object   serviceSelector);
56  
57      /**
58       * Invoked by <code>BeanContextServices</code>, 
59       * this method releases a nested <code>BeanContextChild</code>'s 
60       * (or any arbitrary object associated with a
61       * <code>BeanContextChild</code>) reference to the specified service.
62       * 
63       * @param bcs the <code>BeanContextServices</code> associated with this
64       * particular release request
65       *
66       * @param requestor the object requesting the service to be released
67       * 
68       * @param service the service that is to be released
69       */
70      public void releaseService(BeanContextServices   bcs, Object   requestor, Object   service);
71  
72      /**
73       * Invoked by <code>BeanContextServices</code>, this method
74       * gets the current service selectors for the specified service. 
75       * A service selector is a service specific parameter, 
76       * typical examples of which could include: a
77       * parameter to a constructor for the service implementation class, 
78       * a value for a particular service's property, or a key into a 
79       * map of existing implementations. 
80       *
81       * @param bcs           the <code>BeanContextServices</code> for this request
82       * @param serviceClass  the specified service
83       * @return   the current service selectors for the specified serviceClass
84       */
85      Iterator   getCurrentServiceSelectors(BeanContextServices   bcs, Class   serviceClass);
86  }
87  
88  
89
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Popular Tags