001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    package org.apache.camel.component.bean;
018    
019    import java.io.Externalizable;
020    import java.io.IOException;
021    import java.io.ObjectInput;
022    import java.io.ObjectOutput;
023    import java.lang.reflect.InvocationTargetException;
024    import java.lang.reflect.Method;
025    import java.util.Arrays;
026    
027    import org.apache.camel.Exchange;
028    import org.apache.camel.util.IOHelper;
029    import org.apache.camel.util.ObjectHelper;
030    
031    /**
032     * Invocation of beans that can handle being serialized.
033     */
034    public class BeanInvocation implements Externalizable {
035        private Object[] args;
036        private MethodBean methodBean;
037        private transient Method method;
038    
039        public BeanInvocation() {
040        }
041    
042        public BeanInvocation(Method method, Object[] args) {
043            this.method = method;
044            this.args = args;
045        }
046    
047        @Override
048        public String toString() {
049            Object list = null;
050            if (args != null) {
051                list = Arrays.asList(args);
052            }
053            return "BeanInvocation " + method + " with " + list + "]";
054        }
055    
056        public Object[] getArgs() {
057            return args;
058        }
059    
060        public Method getMethod() {
061            return method;
062        }
063    
064        public void setMethod(Method method) {
065            this.method = method;
066        }
067    
068        public void setArgs(Object[] args) {
069            this.args = args;
070        }
071    
072        /**
073         * This causes us to invoke the endpoint Pojo using reflection.
074         *
075         * @param pojo     the bean on which to perform this invocation
076         * @param exchange the exchange carrying the method invocation
077         */
078        public void invoke(Object pojo, Exchange exchange) {
079            try {
080                Object response = getMethod().invoke(pojo, getArgs());
081                exchange.getOut().setBody(response);
082            } catch (InvocationTargetException e) {
083                exchange.setException(e.getCause());
084            } catch (RuntimeException e) {
085                throw e;
086            } catch (Throwable e) {
087                throw new RuntimeException(e);
088            }
089        }
090    
091        public void readExternal(ObjectInput objectInput) throws IOException, ClassNotFoundException {
092            methodBean = ObjectHelper.cast(MethodBean.class, objectInput.readObject());
093            try {
094                method = methodBean.getMethod();
095            } catch (NoSuchMethodException e) {
096                throw IOHelper.createIOException(e);
097            }
098            args = ObjectHelper.cast(Object[].class, objectInput.readObject());
099        }
100    
101        public void writeExternal(ObjectOutput objectOutput) throws IOException {
102            if (methodBean == null) {
103                methodBean = new MethodBean(method);
104            }
105            objectOutput.writeObject(methodBean);
106            objectOutput.writeObject(args);
107        }
108    }