Source Code Cross Referenced for Provider.java in  » Testing » Ejb3Unit » com » bm » ejb3guice » inject » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Ejb3Unit » com.bm.ejb3guice.inject 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**
02:         * Copyright (C) 2006 Google Inc.
03:         *
04:         * Licensed under the Apache License, Version 2.0 (the "License");
05:         * you may not use this file except in compliance with the License.
06:         * You may obtain a copy of the License at
07:         *
08:         * http://www.apache.org/licenses/LICENSE-2.0
09:         *
10:         * Unless required by applicable law or agreed to in writing, software
11:         * distributed under the License is distributed on an "AS IS" BASIS,
12:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13:         * See the License for the specific language governing permissions and
14:         * limitations under the License.
15:         */package com.bm.ejb3guice.inject;
16:
17:        /**
18:         * Simply, any object capable of providing instances of type {@code T}.
19:         * Providers are used in numerous ways by the Guice framework:
20:         *
21:         * <ul>
22:         * <li>When the default means for obtaining instances (an injectable or
23:         * parameterless constructor) is insufficient for a particular binding, the
24:         * module can specify a custom {@code Provider} instead, to control exactly how
25:         * Guice creates or obtains instances for the binding.
26:         *
27:         * <li>An implementation class may always choose to have a {@code Provider<T>}
28:         * instance injected, rather than having a {@code T} injected directly.  This
29:         * may give you access to multiple instances, instances you wish to safely
30:         * mutate and discard, instances which are out of scope (e.g. using a
31:         * {@code @RequestScoped} object from within a {@code @SessionScoped} object),
32:         * or instances you don't want to initialize until they are absolutely needed.
33:         *
34:         * <li>A custom {@link Scope} is implemented as a decorator of
35:         * {@code Provider<T>}, which decides when to delegate to the backing provider
36:         * and when to provide the instance some other way.
37:         *
38:         * <li>The {@link Injector} offers access to the {@code Provider<T>} it uses
39:         * to fulfill requests for a given key, via the {@link Injector#getProvider}
40:         * methods.
41:         * </ul>
42:         *
43:         * @param <T> the type of object this provider provides
44:         *
45:         * @author crazybob@google.com (Bob Lee)
46:         */
47:        public interface Provider<T> {
48:
49:            /**
50:             * Provides an instance of {@code T}. Must never return {@code null}.
51:             *
52:             * @throws OutOfScopeException when an attempt is made to access a scoped
53:             *     object while the scope in question is not currently active
54:             */
55:            T get();
56:        }
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