Source Code Cross Referenced for RemoteExporter.java in  » J2EE » spring-framework-2.5 » org » springframework » remoting » 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.remoting.support 
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.remoting.support;
018:
019:        import org.apache.commons.logging.Log;
020:        import org.apache.commons.logging.LogFactory;
021:
022:        import org.springframework.aop.framework.ProxyFactory;
023:        import org.springframework.beans.factory.BeanClassLoaderAware;
024:        import org.springframework.util.ClassUtils;
025:
026:        /**
027:         * Abstract base class for classes that export a remote service.
028:         * Provides "service" and "serviceInterface" bean properties.
029:         *
030:         * <p>Note that the service interface being used will show some signs of
031:         * remotability, like the granularity of method calls that it offers.
032:         * Furthermore, it has to have serializable arguments etc.
033:         *
034:         * @author Juergen Hoeller
035:         * @since 26.12.2003
036:         */
037:        public abstract class RemoteExporter implements  BeanClassLoaderAware {
038:
039:            /** Logger available to subclasses */
040:            protected final Log logger = LogFactory.getLog(getClass());
041:
042:            private Object service;
043:
044:            private Class serviceInterface;
045:
046:            private boolean registerTraceInterceptor = true;
047:
048:            private ClassLoader beanClassLoader = ClassUtils
049:                    .getDefaultClassLoader();
050:
051:            /**
052:             * Set the service to export.
053:             * Typically populated via a bean reference.
054:             */
055:            public void setService(Object service) {
056:                this .service = service;
057:            }
058:
059:            /**
060:             * Return the service to export.
061:             */
062:            public Object getService() {
063:                return this .service;
064:            }
065:
066:            /**
067:             * Set the interface of the service to export.
068:             * The interface must be suitable for the particular service and remoting strategy.
069:             */
070:            public void setServiceInterface(Class serviceInterface) {
071:                if (serviceInterface != null && !serviceInterface.isInterface()) {
072:                    throw new IllegalArgumentException(
073:                            "'serviceInterface' must be an interface");
074:                }
075:                this .serviceInterface = serviceInterface;
076:            }
077:
078:            /**
079:             * Return the interface of the service to export.
080:             */
081:            public Class getServiceInterface() {
082:                return this .serviceInterface;
083:            }
084:
085:            /**
086:             * Set whether to register a RemoteInvocationTraceInterceptor for exported
087:             * services. Only applied when a subclass uses <code>getProxyForService</code>
088:             * for creating the proxy to expose.
089:             * <p>Default is "true". RemoteInvocationTraceInterceptor's most important value
090:             * is that it logs exception stacktraces on the server, before propagating
091:             * an exception to the client.
092:             * @see #getProxyForService
093:             * @see RemoteInvocationTraceInterceptor
094:             */
095:            public void setRegisterTraceInterceptor(
096:                    boolean registerTraceInterceptor) {
097:                this .registerTraceInterceptor = registerTraceInterceptor;
098:            }
099:
100:            /**
101:             * Return whether to register a RemoteInvocationTraceInterceptor for
102:             * exported services.
103:             */
104:            protected boolean isRegisterTraceInterceptor() {
105:                return this .registerTraceInterceptor;
106:            }
107:
108:            public void setBeanClassLoader(ClassLoader classLoader) {
109:                this .beanClassLoader = classLoader;
110:            }
111:
112:            /**
113:             * Check whether the service reference has been set.
114:             * @see #setService
115:             */
116:            protected void checkService() throws IllegalArgumentException {
117:                if (this .service == null) {
118:                    throw new IllegalArgumentException(
119:                            "Property 'service' is required");
120:                }
121:            }
122:
123:            /**
124:             * Check whether a service reference has been set,
125:             * and whether it matches the specified service.
126:             * @see #setServiceInterface
127:             * @see #setService
128:             */
129:            protected void checkServiceInterface()
130:                    throws IllegalArgumentException {
131:                if (this .serviceInterface == null) {
132:                    throw new IllegalArgumentException(
133:                            "Property 'serviceInterface' is required");
134:                }
135:                if (this .service instanceof  String) {
136:                    throw new IllegalArgumentException(
137:                            "Service ["
138:                                    + this .service
139:                                    + "] is a String "
140:                                    + "rather than an actual service reference: Have you accidentally specified "
141:                                    + "the service bean name as value instead of as reference?");
142:                }
143:                if (!this .serviceInterface.isInstance(this .service)) {
144:                    throw new IllegalArgumentException("Service interface ["
145:                            + this .serviceInterface.getName()
146:                            + "] needs to be implemented by service ["
147:                            + this .service + "] of class ["
148:                            + this .service.getClass().getName() + "]");
149:                }
150:            }
151:
152:            /**
153:             * Get a proxy for the given service object, implementing the specified
154:             * service interface.
155:             * <p>Used to export a proxy that does not expose any internals but just
156:             * a specific interface intended for remote access. Furthermore, a
157:             * {@link RemoteInvocationTraceInterceptor} will be registered (by default).
158:             * @return the proxy
159:             * @see #setServiceInterface
160:             * @see #setRegisterTraceInterceptor
161:             * @see RemoteInvocationTraceInterceptor
162:             */
163:            protected Object getProxyForService() {
164:                checkService();
165:                checkServiceInterface();
166:                ProxyFactory proxyFactory = new ProxyFactory();
167:                proxyFactory.addInterface(getServiceInterface());
168:                if (isRegisterTraceInterceptor()) {
169:                    proxyFactory
170:                            .addAdvice(new RemoteInvocationTraceInterceptor(
171:                                    getExporterName()));
172:                }
173:                proxyFactory.setTarget(getService());
174:                return proxyFactory.getProxy(this .beanClassLoader);
175:            }
176:
177:            /**
178:             * Return a short name for this exporter.
179:             * Used for tracing of remote invocations.
180:             * <p>Default is the unqualified class name (without package).
181:             * Can be overridden in subclasses.
182:             * @see #getProxyForService
183:             * @see RemoteInvocationTraceInterceptor
184:             * @see org.springframework.util.ClassUtils#getShortName
185:             */
186:            protected String getExporterName() {
187:                return ClassUtils.getShortName(getClass());
188:            }
189:
190:        }
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