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| 1 | /* | ||
| 2 | * Copyright (c) 1998, 2004, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.beans.beancontext; | ||
| 27 | |||
| 28 | import java.util.Iterator; | ||
| 29 | |||
| 30 | /** | ||
| 31 | * <p> | ||
| 32 | * One of the primary functions of a BeanContext is to act a as rendezvous | ||
| 33 | * between JavaBeans, and BeanContextServiceProviders. | ||
| 34 | * </p> | ||
| 35 | * <p> | ||
| 36 | * A JavaBean nested within a BeanContext, may ask that BeanContext to | ||
| 37 | * provide an instance of a "service", based upon a reference to a Java | ||
| 38 | * Class object that represents that service. | ||
| 39 | * </p> | ||
| 40 | * <p> | ||
| 41 | * If such a service has been registered with the context, or one of its | ||
| 42 | * nesting context's, in the case where a context delegate to its context | ||
| 43 | * to satisfy a service request, then the BeanContextServiceProvider associated with | ||
| 44 | * the service is asked to provide an instance of that service. | ||
| 45 | * </p> | ||
| 46 | * <p> | ||
| 47 | * The ServcieProvider may always return the same instance, or it may | ||
| 48 | * construct a new instance for each request. | ||
| 49 | * </p> | ||
| 50 | */ | ||
| 51 | |||
| 52 | public interface BeanContextServiceProvider { | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Invoked by <code>BeanContextServices</code>, this method | ||
| 56 | * requests an instance of a | ||
| 57 | * service from this <code>BeanContextServiceProvider</code>. | ||
| 58 | * | ||
| 59 | * @param bcs The <code>BeanContextServices</code> associated with this | ||
| 60 | * particular request. This parameter enables the | ||
| 61 | * <code>BeanContextServiceProvider</code> to distinguish service | ||
| 62 | * requests from multiple sources. | ||
| 63 | * | ||
| 64 | * @param requestor The object requesting the service | ||
| 65 | * | ||
| 66 | * @param serviceClass The service requested | ||
| 67 | * | ||
| 68 | * @param serviceSelector the service dependent parameter | ||
| 69 | * for a particular service, or <code>null</code> if not applicable. | ||
| 70 | * | ||
| 71 | * @return a reference to the requested service | ||
| 72 | */ | ||
| 73 | Object getService(BeanContextServices bcs, Object requestor, Class serviceClass, Object serviceSelector); | ||
| 74 | |||
| 75 | /** | ||
| 76 | * Invoked by <code>BeanContextServices</code>, | ||
| 77 | * this method releases a nested <code>BeanContextChild</code>'s | ||
| 78 | * (or any arbitrary object associated with a | ||
| 79 | * <code>BeanContextChild</code>) reference to the specified service. | ||
| 80 | * | ||
| 81 | * @param bcs the <code>BeanContextServices</code> associated with this | ||
| 82 | * particular release request | ||
| 83 | * | ||
| 84 | * @param requestor the object requesting the service to be released | ||
| 85 | * | ||
| 86 | * @param service the service that is to be released | ||
| 87 | */ | ||
| 88 | public void releaseService(BeanContextServices bcs, Object requestor, Object service); | ||
| 89 | |||
| 90 | /** | ||
| 91 | * Invoked by <code>BeanContextServices</code>, this method | ||
| 92 | * gets the current service selectors for the specified service. | ||
| 93 | * A service selector is a service specific parameter, | ||
| 94 | * typical examples of which could include: a | ||
| 95 | * parameter to a constructor for the service implementation class, | ||
| 96 | * a value for a particular service's property, or a key into a | ||
| 97 | * map of existing implementations. | ||
| 98 | * | ||
| 99 | * @param bcs the <code>BeanContextServices</code> for this request | ||
| 100 | * @param serviceClass the specified service | ||
| 101 | * @return the current service selectors for the specified serviceClass | ||
| 102 | */ | ||
| 103 | Iterator getCurrentServiceSelectors(BeanContextServices bcs, Class serviceClass); | ||
| 104 | } | ||