Source Code Cross Referenced for AspectSystemFactory.java in  » Testing » MockEJB » org » mockejb » interceptor » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » MockEJB » org.mockejb.interceptor 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.mockejb.interceptor;
02:
03:        /**
04:         * Loads the class implementing AspectSystem and returns the object of this class
05:         * to the client. The class name is specified by the system property "interceptor.aspect.system".
06:         * If system property is not provided, returns the default factory {@link AspectSystemImpl}
07:         * provided by the framework.
08:         * 
09:         * @author Alexander Ananiev
10:         */
11:        public class AspectSystemFactory {
12:
13:            /**
14:             * Name of the system property providing the name of the aspect system class
15:             * to use instead of the default 
16:             */
17:            public static final String ASPECT_SYSTEM_PROPERTY = "interceptor.aspect.system.class";
18:
19:            public static final String THREAD_LOCAL_ASPECT_SYSTEM = "interceptor.aspect.system.thread";
20:
21:            private static AspectSystem aspectSystem;
22:
23:            /**
24:             * Loads the aspect system class provided in the ASPECT_SYSTEM_PROPERTY 
25:             * system property. 
26:             * If the property is not provided, {@ AspectSystemImpl} class is used.
27:             * 
28:             * We load it in the static block to avoid having to synchronize
29:             */
30:            static {
31:
32:                aspectSystem = loadAspectSystem();
33:            }
34:
35:            private static ThreadLocal aspectSystemForThread = new ThreadLocal() {
36:                protected Object initialValue() {
37:                    return loadAspectSystem();
38:                }
39:            };
40:
41:            private static AspectSystem loadAspectSystem() {
42:
43:                AspectSystem aspectSystem;
44:
45:                String aspectSystemClassName = System
46:                        .getProperty(ASPECT_SYSTEM_PROPERTY);
47:
48:                if (aspectSystemClassName != null) {
49:                    try {
50:
51:                        Class aspectSystemClass = Class.forName(
52:                                aspectSystemClassName, true,
53:                                AspectSystemFactory.class.getClassLoader());
54:                        aspectSystem = (AspectSystem) aspectSystemClass
55:                                .newInstance();
56:
57:                    } catch (ClassNotFoundException cnfe) {
58:                        throw new AspectException(cnfe);
59:                    } catch (InstantiationException ie) {
60:                        throw new AspectException(ie);
61:                    } catch (IllegalAccessException iae) {
62:                        throw new AspectException(iae);
63:                    }
64:                } else
65:                    aspectSystem = new AspectSystemImpl();
66:
67:                return aspectSystem;
68:
69:            }
70:
71:            /**
72:             * If system property "interceptor.aspect.system.thread" set to true, 
73:             * returns AspectSystem instance which is stored in 
74:             * a ThreadLocal variable. This is convenient, for example, 
75:             * if test classes can run concurrently and each needs to set its
76:             * own aspects .
77:             * Otherwise returns the singleton aspect system (always the same instance per JVM)
78:             * @return AspectSystem
79:             */
80:            public static AspectSystem getAspectSystem() {
81:
82:                String threadLocalAspectSystemProp = System
83:                        .getProperty(THREAD_LOCAL_ASPECT_SYSTEM);
84:
85:                if (threadLocalAspectSystemProp != null
86:                        && threadLocalAspectSystemProp.equalsIgnoreCase("true"))
87:                    return (AspectSystem) aspectSystemForThread.get();
88:                else
89:                    return aspectSystem;
90:
91:            }
92:
93:        }
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