Source Code Cross Referenced for HotSwappableTargetSource.java in  » J2EE » spring-framework-2.0.6 » 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 2.0.6 » 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.Serializable;
020:
021:        import org.springframework.aop.TargetSource;
022:        import org.springframework.util.Assert;
023:
024:        /**
025:         * {@link org.springframework.aop.TargetSource} implementation that
026:         * caches a local target object, but allows the target to be swapped
027:         * while the application is running.
028:         *
029:         * <p>If configuring an object of this class in a Spring IoC container,
030:         * use constructor injection.
031:         *
032:         * <p>This TargetSource is serializable if the target is at the time
033:         * of serialization.
034:         *
035:         * @author Rod Johnson
036:         * @author Juergen Hoeller
037:         */
038:        public class HotSwappableTargetSource implements  TargetSource,
039:                Serializable {
040:
041:            /** use serialVersionUID from Spring 1.2 for interoperability */
042:            private static final long serialVersionUID = 7497929212653839187L;
043:
044:            /** The current target object */
045:            private Object target;
046:
047:            /**
048:             * Create a new HotSwappableTargetSource with the given initial target object.
049:             * @param initialTarget the initial target object
050:             */
051:            public HotSwappableTargetSource(Object initialTarget) {
052:                Assert.notNull(initialTarget, "Target object must not be null");
053:                this .target = initialTarget;
054:            }
055:
056:            /**
057:             * Return the type of the current target object.
058:             * <p>The returned type should usually be constant across all target objects.
059:             */
060:            public synchronized Class getTargetClass() {
061:                return this .target.getClass();
062:            }
063:
064:            public final boolean isStatic() {
065:                return false;
066:            }
067:
068:            public synchronized Object getTarget() {
069:                return this .target;
070:            }
071:
072:            public void releaseTarget(Object target) {
073:                // nothing to do
074:            }
075:
076:            /**
077:             * Swap the target, returning the old target object.
078:             * @param newTarget the new target object
079:             * @return the old target object
080:             * @throws IllegalArgumentException if the new target is invalid
081:             */
082:            public synchronized Object swap(Object newTarget)
083:                    throws IllegalArgumentException {
084:                Assert.notNull(newTarget, "Target object must not be null");
085:                Object old = this .target;
086:                this .target = newTarget;
087:                return old;
088:            }
089:
090:            /**
091:             * Two HotSwappableTargetSources are equal if the current target
092:             * objects are equal.
093:             */
094:            public boolean equals(Object other) {
095:                return (this  == other || (other instanceof  HotSwappableTargetSource && this .target
096:                        .equals(((HotSwappableTargetSource) other).target)));
097:            }
098:
099:            public int hashCode() {
100:                return HotSwappableTargetSource.class.hashCode();
101:            }
102:
103:            public String toString() {
104:                return "HotSwappableTargetSource for target: " + this.target;
105:            }
106:
107:        }
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