Source Code Cross Referenced for SimpleRemoteStatelessSessionProxyFactoryBean.java in  » J2EE » spring-framework-2.0.6 » org » springframework » ejb » access » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.0.6 » org.springframework.ejb.access 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2007 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.ejb.access;
018:
019:        import javax.naming.NamingException;
020:
021:        import org.springframework.aop.framework.ProxyFactory;
022:        import org.springframework.beans.factory.BeanClassLoaderAware;
023:        import org.springframework.beans.factory.FactoryBean;
024:        import org.springframework.util.ClassUtils;
025:
026:        /**
027:         * <p>Convenient factory for remote SLSB proxies.
028:         * If you want control over interceptor chaining, use an AOP ProxyFactoryBean
029:         * with SimpleRemoteSlsbInvokerInterceptor rather than rely on this class.</p>
030:         * 
031:         * <p>See {@link org.springframework.jndi.JndiObjectLocator} for info on
032:         * how to specify the JNDI location of the target EJB.</p>
033:         * 
034:         * <p>In a bean container, this class is normally best used as a singleton. However,
035:         * if that bean container pre-instantiates singletons (as do the XML ApplicationContext
036:         * variants) you may have a problem if the bean container is loaded before the EJB
037:         * container loads the target EJB. That is because by default the JNDI lookup will be
038:         * performed in the init method of this class and cached, but the EJB will not have been
039:         * bound at the target location yet. The best solution is to set the lookupHomeOnStartup
040:         * property to false, in which case the home will be fetched on first access to the EJB.
041:         * (This flag is only true by default for backwards compatibility reasons).</p>
042:         * 
043:         * <p>This proxy factory is typically used with an RMI business interface, which serves
044:         * as super-interface of the EJB component interface. Alternatively, this factory
045:         * can also proxy a remote SLSB with a matching non-RMI business interface, i.e. an
046:         * interface that mirrors the EJB business methods but does not declare RemoteExceptions.
047:         * In the latter case, RemoteExceptions thrown by the EJB stub will automatically get
048:         * converted to Spring's unchecked RemoteAccessException.</p>
049:         *
050:         * @author Rod Johnson
051:         * @author Colin Sampaleanu
052:         * @author Juergen Hoeller
053:         * @since 09.05.2003
054:         * @see org.springframework.remoting.RemoteAccessException
055:         * @see AbstractSlsbInvokerInterceptor#setLookupHomeOnStartup
056:         * @see AbstractSlsbInvokerInterceptor#setCacheHome
057:         * @see AbstractRemoteSlsbInvokerInterceptor#setRefreshHomeOnConnectFailure
058:         */
059:        public class SimpleRemoteStatelessSessionProxyFactoryBean extends
060:                SimpleRemoteSlsbInvokerInterceptor implements  FactoryBean,
061:                BeanClassLoaderAware {
062:
063:            /** The business interface of the EJB we're proxying */
064:            private Class businessInterface;
065:
066:            private ClassLoader beanClassLoader = ClassUtils
067:                    .getDefaultClassLoader();
068:
069:            /** EJBObject */
070:            private Object proxy;
071:
072:            /**
073:             * Set the business interface of the EJB we're proxying.
074:             * This will normally be a super-interface of the EJB remote component interface.
075:             * Using a business methods interface is a best practice when implementing EJBs.
076:             * <p>You can also specify a matching non-RMI business interface, i.e. an interface
077:             * that mirrors the EJB business methods but does not declare RemoteExceptions.
078:             * In this case, RemoteExceptions thrown by the EJB stub will automatically get
079:             * converted to Spring's generic RemoteAccessException.
080:             * @param businessInterface the business interface of the EJB
081:             */
082:            public void setBusinessInterface(Class businessInterface) {
083:                this .businessInterface = businessInterface;
084:            }
085:
086:            /**
087:             * Return the business interface of the EJB we're proxying.
088:             */
089:            public Class getBusinessInterface() {
090:                return this .businessInterface;
091:            }
092:
093:            public void setBeanClassLoader(ClassLoader classLoader) {
094:                this .beanClassLoader = classLoader;
095:            }
096:
097:            public void afterPropertiesSet() throws NamingException {
098:                super .afterPropertiesSet();
099:                if (this .businessInterface == null) {
100:                    throw new IllegalArgumentException(
101:                            "businessInterface is required");
102:                }
103:                this .proxy = new ProxyFactory(this .businessInterface, this )
104:                        .getProxy(this .beanClassLoader);
105:            }
106:
107:            public Object getObject() {
108:                return this .proxy;
109:            }
110:
111:            public Class getObjectType() {
112:                return this .businessInterface;
113:            }
114:
115:            public boolean isSingleton() {
116:                return true;
117:            }
118:
119:        }
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