Source Code Cross Referenced for AbstractStatelessSessionBean.java in  » J2EE » spring-framework-2.5 » org » springframework » ejb » support » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.ejb.support 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * Copyright 2002-2007 the original author or authors.
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:         */
16:
17:        package org.springframework.ejb.support;
18:
19:        import javax.ejb.CreateException;
20:        import javax.ejb.EJBException;
21:
22:        import org.apache.commons.logging.Log;
23:        import org.apache.commons.logging.LogFactory;
24:
25:        /**
26:         * Convenient superclass for stateless session beans (SLSBs), minimizing
27:         * the work involved in implementing an SLSB and preventing common errors.
28:         * <b>Note that SLSBs are the most useful kind of EJB.</b>
29:         *
30:         * <p>As the ejbActivate() and ejbPassivate() methods cannot be invoked
31:         * on SLSBs, these methods are implemented to throw an exception and should
32:         * not be overriden by subclasses. (Unfortunately the EJB specification
33:         * forbids enforcing this by making EJB lifecycle methods final.)
34:         *
35:         * <p>There should be no need to override the <code>setSessionContext()</code>
36:         * or <code>ejbCreate()</code> lifecycle methods.
37:         *
38:         * <p>Subclasses are left to implement the <code>onEjbCreate()</code> method
39:         * to do whatever initialization they wish to do after their BeanFactory has
40:         * already been loaded, and is available from the <code>getBeanFactory()</code>
41:         * method.
42:         *
43:         * <p>This class provides the no-arg <code>ejbCreate()</code> method required
44:         * by the EJB specification, but not the SessionBean interface, eliminating
45:         * a common cause of EJB deployment failure.
46:         *
47:         * @author Rod Johnson
48:         */
49:        public abstract class AbstractStatelessSessionBean extends
50:                AbstractSessionBean {
51:
52:            /** Logger available to subclasses */
53:            protected final Log logger = LogFactory.getLog(getClass());
54:
55:            /**
56:             * This implementation loads the BeanFactory. A BeansException thrown by
57:             * loadBeanFactory will simply get propagated, as it is a runtime exception.
58:             * <p>Don't override it (although it can't be made final): code your own
59:             * initialization in onEjbCreate(), which is called when the BeanFactory
60:             * is available.
61:             * <p>Unfortunately we can't load the BeanFactory in setSessionContext(),
62:             * as resource manager access isn't permitted there - but the BeanFactory
63:             * may require it.
64:             */
65:            public void ejbCreate() throws CreateException {
66:                loadBeanFactory();
67:                onEjbCreate();
68:            }
69:
70:            /**
71:             * Subclasses must implement this method to do any initialization
72:             * they would otherwise have done in an <code>ejbCreate()</code> method.
73:             * In contrast to <code>ejbCreate</code>, the BeanFactory will have been loaded here.
74:             * <p>The same restrictions apply to the work of this method as
75:             * to an <code>ejbCreate()</code> method.
76:             * @throws CreateException
77:             */
78:            protected abstract void onEjbCreate() throws CreateException;
79:
80:            /**
81:             * @see javax.ejb.SessionBean#ejbActivate(). This method always throws an exception, as
82:             * it should not be invoked by the EJB container.
83:             */
84:            public void ejbActivate() throws EJBException {
85:                throw new IllegalStateException(
86:                        "ejbActivate must not be invoked on a stateless session bean");
87:            }
88:
89:            /**
90:             * @see javax.ejb.SessionBean#ejbPassivate(). This method always throws an exception, as
91:             * it should not be invoked by the EJB container.
92:             */
93:            public void ejbPassivate() throws EJBException {
94:                throw new IllegalStateException(
95:                        "ejbPassivate must not be invoked on a stateless session bean");
96:            }
97:
98:        }
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