Source Code Cross Referenced for AbstractBeanFactoryBasedTargetSource.java in  » J2EE » spring-framework-2.5 » org » springframework » aop » target » 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.aop.target 
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.aop.target;
018:
019:        import java.io.NotSerializableException;
020:        import java.io.ObjectStreamException;
021:        import java.io.Serializable;
022:
023:        import org.apache.commons.logging.Log;
024:        import org.apache.commons.logging.LogFactory;
025:
026:        import org.springframework.aop.TargetSource;
027:        import org.springframework.beans.BeansException;
028:        import org.springframework.beans.factory.BeanFactory;
029:        import org.springframework.beans.factory.BeanFactoryAware;
030:        import org.springframework.util.ClassUtils;
031:        import org.springframework.util.ObjectUtils;
032:
033:        /**
034:         * Base class for {@link org.springframework.aop.TargetSource} implementations
035:         * that are based on a Spring {@link org.springframework.beans.factory.BeanFactory},
036:         * delegating to Spring-managed bean instances.
037:         *
038:         * <p>Subclasses can create prototype instances or lazily access a
039:         * singleton target, for example. See {@link LazyInitTargetSource} and
040:         * {@link AbstractPrototypeBasedTargetSource}'s subclasses for concrete strategies.
041:         *
042:         * <p>BeanFactory-based TargetSources are serializable. This involves
043:         * disconnecting the current target and turning into a {@link SingletonTargetSource}.
044:         *
045:         * @author Juergen Hoeller
046:         * @author Rod Johnson
047:         * @since 1.1.4
048:         * @see org.springframework.beans.factory.BeanFactory#getBean
049:         * @see LazyInitTargetSource
050:         * @see PrototypeTargetSource
051:         * @see ThreadLocalTargetSource
052:         * @see CommonsPoolTargetSource
053:         */
054:        public abstract class AbstractBeanFactoryBasedTargetSource implements 
055:                TargetSource, BeanFactoryAware, Serializable {
056:
057:            /** use serialVersionUID from Spring 1.2.7 for interoperability */
058:            private static final long serialVersionUID = -4721607536018568393L;
059:
060:            /** Logger available to subclasses */
061:            protected final Log logger = LogFactory.getLog(getClass());
062:
063:            /** Name of the target bean we will create on each invocation */
064:            private String targetBeanName;
065:
066:            /** Class of the target */
067:            private Class targetClass;
068:
069:            /**
070:             * BeanFactory that owns this TargetSource. We need to hold onto this
071:             * reference so that we can create new prototype instances as necessary.
072:             */
073:            private BeanFactory beanFactory;
074:
075:            /**
076:             * Set the name of the target bean in the factory.
077:             * <p>The target bean should not be a singleton, else the same instance will
078:             * always be obtained from the factory, resulting in the same behavior as
079:             * provided by {@link SingletonTargetSource}.
080:             * @param targetBeanName name of the target bean in the BeanFactory
081:             * that owns this interceptor
082:             * @see SingletonTargetSource
083:             */
084:            public void setTargetBeanName(String targetBeanName) {
085:                this .targetBeanName = targetBeanName;
086:            }
087:
088:            /**
089:             * Return the name of the target bean in the factory.
090:             */
091:            public String getTargetBeanName() {
092:                return this .targetBeanName;
093:            }
094:
095:            /**
096:             * Specify the target class explicitly, to avoid any kind of access to the
097:             * target bean (for example, to avoid initialization of a FactoryBean instance).
098:             * <p>Default is to detect the type automatically, through a <code>getType</code>
099:             * call on the BeanFactory (or even a full <code>getBean</code> call as fallback).
100:             */
101:            public void setTargetClass(Class targetClass) {
102:                this .targetClass = targetClass;
103:            }
104:
105:            /**
106:             * Set the owning BeanFactory. We need to save a reference so that we can
107:             * use the <code>getBean</code> method on every invocation.
108:             */
109:            public void setBeanFactory(BeanFactory beanFactory)
110:                    throws BeansException {
111:                if (this .targetBeanName == null) {
112:                    throw new IllegalStateException(
113:                            "Property'targetBeanName' is required");
114:                }
115:                this .beanFactory = beanFactory;
116:            }
117:
118:            /**
119:             * Return the owning BeanFactory.
120:             */
121:            public BeanFactory getBeanFactory() {
122:                return this .beanFactory;
123:            }
124:
125:            public synchronized Class getTargetClass() {
126:                if (this .targetClass == null && this .beanFactory != null) {
127:                    // Determine type of the target bean.
128:                    this .targetClass = this .beanFactory
129:                            .getType(this .targetBeanName);
130:                    if (this .targetClass == null) {
131:                        if (logger.isTraceEnabled()) {
132:                            logger.trace("Getting bean with name '"
133:                                    + this .targetBeanName
134:                                    + "' in order to determine type");
135:                        }
136:                        this .targetClass = this .beanFactory.getBean(
137:                                this .targetBeanName).getClass();
138:                    }
139:                }
140:                return this .targetClass;
141:            }
142:
143:            public boolean isStatic() {
144:                return false;
145:            }
146:
147:            public void releaseTarget(Object target) throws Exception {
148:                // Nothing to do here.
149:            }
150:
151:            /**
152:             * Copy configuration from the other AbstractBeanFactoryBasedTargetSource object.
153:             * Subclasses should override this if they wish to expose it.
154:             * @param other object to copy configuration from
155:             */
156:            protected void copyFrom(AbstractBeanFactoryBasedTargetSource other) {
157:                this .targetBeanName = other.targetBeanName;
158:                this .targetClass = other.targetClass;
159:                this .beanFactory = other.beanFactory;
160:            }
161:
162:            /**
163:             * Replaces this object with a SingletonTargetSource on serialization.
164:             * Protected as otherwise it won't be invoked for subclasses.
165:             * (The <code>writeReplace()</code> method must be visible to the class
166:             * being serialized.)
167:             * <p>With this implementation of this method, there is no need to mark
168:             * non-serializable fields in this class or subclasses as transient.
169:             */
170:            protected Object writeReplace() throws ObjectStreamException {
171:                if (logger.isDebugEnabled()) {
172:                    logger.debug("Disconnecting TargetSource [" + this  + "]");
173:                }
174:                try {
175:                    // Create disconnected SingletonTargetSource.
176:                    return new SingletonTargetSource(getTarget());
177:                } catch (Exception ex) {
178:                    logger.error(
179:                            "Cannot get target for disconnecting TargetSource ["
180:                                    + this  + "]", ex);
181:                    throw new NotSerializableException(
182:                            "Cannot get target for disconnecting TargetSource ["
183:                                    + this  + "]: " + ex);
184:                }
185:            }
186:
187:            public boolean equals(Object other) {
188:                if (this  == other) {
189:                    return true;
190:                }
191:                if (other == null || !getClass().equals(other.getClass())) {
192:                    return false;
193:                }
194:                AbstractBeanFactoryBasedTargetSource otherTargetSource = (AbstractBeanFactoryBasedTargetSource) other;
195:                return (ObjectUtils.nullSafeEquals(this .beanFactory,
196:                        otherTargetSource.beanFactory) && ObjectUtils
197:                        .nullSafeEquals(this .targetBeanName,
198:                                otherTargetSource.targetBeanName));
199:            }
200:
201:            public int hashCode() {
202:                int hashCode = getClass().hashCode();
203:                hashCode = 13 * hashCode
204:                        + ObjectUtils.nullSafeHashCode(this .beanFactory);
205:                hashCode = 13 * hashCode
206:                        + ObjectUtils.nullSafeHashCode(this .targetBeanName);
207:                return hashCode;
208:            }
209:
210:            public String toString() {
211:                StringBuffer sb = new StringBuffer();
212:                sb.append(ClassUtils.getShortName(getClass()));
213:                sb.append(" for target bean '").append(this .targetBeanName)
214:                        .append("'");
215:                if (this .targetClass != null) {
216:                    sb.append(" of type [").append(this .targetClass.getName())
217:                            .append("]");
218:                }
219:                return sb.toString();
220:            }
221:
222:        }
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