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BeanFactory.java | - | - | - | - |
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1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
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 implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.hivemind.lib; | |
16 | ||
17 | /** | |
18 | * Service interface for a source of beans of a particular type. | |
19 | * Bean instances are retrieved using a <em>locator string</em> which is of the form: | |
20 | * <code><em>name</em>[,<em>initializer</em>]</code>. That is, an optional initializer is | |
21 | * may be specified, separated by a comma. | |
22 | * | |
23 | * <p> | |
24 | * Beans may be cached or not. | |
25 | * | |
26 | * <p> | |
27 | * The <code>hivemind.lib.BeanFactoryBuilder</code> service is used to create services | |
28 | * implementing this interface (driven from a configuration). | |
29 | * | |
30 | * @author Howard Lewis Ship | |
31 | */ | |
32 | public interface BeanFactory | |
33 | { | |
34 | /** | |
35 | * Returns true if a bean matching the provided locator has been | |
36 | * defined. | |
37 | * | |
38 | * @param locator the name or name and initializer | |
39 | * @return true if a bean matching the provided locator has ben defined | |
40 | */ | |
41 | public boolean contains(String locator); | |
42 | ||
43 | /** | |
44 | * Gets a bean via its locator (it's name plus, optionally, an initializer). | |
45 | * | |
46 | * @param locator the name or name and initializer | |
47 | * @return a bean instance | |
48 | * @throws org.apache.hivemind.ApplicationRuntimeException if no bean matching the provided | |
49 | * name has been defined. | |
50 | */ | |
51 | public Object get(String locator); | |
52 | } |
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