Source Code Cross Referenced for HotSwappable.java in  » Inversion-of-Control » PicoContainer » org » picocontainer » gems » behaviors » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Inversion of Control » PicoContainer » org.picocontainer.gems.behaviors 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*****************************************************************************
02:         * Copyright (C) PicoContainer Organization. All rights reserved.            *
03:         * ------------------------------------------------------------------------- *
04:         * The software in this package is published under the terms of the BSD      *
05:         * style license a copy of which has been included with this distribution in *
06:         * the LICENSE.txt file.                                                     *
07:         *                                                                           *
08:         * Original code by                                                          *
09:         *****************************************************************************/package org.picocontainer.gems.behaviors;
10:
11:        import org.picocontainer.ComponentAdapter;
12:        import org.picocontainer.PicoContainer;
13:        import org.picocontainer.behaviors.Cached;
14:
15:        /**
16:         * This component adapter makes it possible to hide the implementation of a real subject (behind a proxy). If the key of the
17:         * component is of type {@link Class} and that class represents an interface, the proxy will only implement the interface
18:         * represented by that Class. Otherwise (if the key is something else), the proxy will implement all the interfaces of the
19:         * underlying subject. In any case, the proxy will also implement {@link com.thoughtworks.proxy.toys.hotswap.Swappable}, making
20:         * it possible to swap out the underlying subject at runtime. <p/> <em>
21:         * Note that this class doesn't cache instances. If you want caching,
22:         * use a {@link Cached} around this one.
23:         * </em>
24:         *
25:         * @author Paul Hammant
26:         */
27:        public class HotSwappable extends HiddenImplementation {
28:
29:            private final Swappable swappable = new Swappable();
30:            private Object instance;
31:
32:            public HotSwappable(ComponentAdapter delegate) {
33:                super (delegate);
34:            }
35:
36:            protected Swappable getSwappable() {
37:                return swappable;
38:            }
39:
40:            public Object swapRealInstance(Object instance) {
41:                return swappable.swap(instance);
42:            }
43:
44:            public Object getRealInstance() {
45:                return swappable.getInstance();
46:            }
47:
48:            public Object getComponentInstance(PicoContainer container) {
49:                synchronized (swappable) {
50:                    if (instance == null) {
51:                        instance = super .getComponentInstance(container);
52:                    }
53:                }
54:                return instance;
55:            }
56:
57:            public String getDescriptor() {
58:                return "HotSwappable";
59:            }
60:
61:            public static class Swappable {
62:
63:                private transient Object delegate;
64:
65:                public Object getInstance() {
66:                    return delegate;
67:                }
68:
69:                public Object swap(Object delegate) {
70:                    Object old = this.delegate;
71:                    this.delegate = delegate;
72:                    return old;
73:                }
74:
75:            }
76:
77:        }
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