CamelRouterBuilder.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.camel.example.cxf.jaxrs;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.cxf.common.message.CxfConstants;
import org.apache.camel.component.properties.PropertiesComponent;
import org.apache.camel.example.cxf.jaxrs.resources.Book;
import org.apache.camel.example.cxf.jaxrs.resources.BookStore;
import org.apache.camel.example.cxf.jaxrs.resources.BookStoreImpl;
import org.apache.camel.impl.DefaultCamelContext;

public class CamelRouterBuilder extends RouteBuilder {
    private static final String SOAP_ENDPOINT_URI = "cxf://http://localhost:{{soapEndpointPort}}/soap"
        + "?serviceClass=org.apache.camel.example.cxf.jaxrs.resources.BookStore";
    private static final String REST_ENDPOINT_URI = "cxfrs://http://localhost:{{restEndpointPort}}/rest"
        + "?resourceClasses=org.apache.camel.example.cxf.jaxrs.resources.BookStoreImpl";
    
    /**
     * Allow this route to be run as an application
     */
    public static void main(String[] args) throws Exception {
        System.setProperty("soapEndpointPort", "9006");
        System.setProperty("restEndpointPort", "9002");
                
        CamelContext context = new DefaultCamelContext();
        PropertiesComponent pc = new PropertiesComponent();
        context.addComponent("properties", pc);
        context.start();
        context.addRoutes(new CamelRouterBuilder());
        Thread.sleep(1000);

        // JAXWSClient invocation
        JAXWSClient jaxwsClient = new JAXWSClient();
        BookStore bookStore = jaxwsClient.getBookStore();
        
        bookStore.addBook(new Book("Camel User Guide", 123L));
        Book book = bookStore.getBook(123L);
        System.out.println("Get the book with id 123. " + book);       

        try {
            book = bookStore.getBook(124L);
            System.out.println("Get the book with id 124. " + book); 
        } catch (Exception exception) {
            System.out.println("Expected exception received: " + exception);
        }

        // JAXRSClient invocation
        JAXRSClient jaxrsClient = new JAXRSClient();
        bookStore =  jaxrsClient.getBookStore();
        
        bookStore.addBook(new Book("Karaf User Guide", 124L));
        book = bookStore.getBook(124L);
        System.out.println("Get the book with id 124. " + book);

        try {
            book = bookStore.getBook(126L);
            System.out.println("Get the book with id 126. " + book); 
        } catch (Exception exception) {
            System.out.println("Expected exception received: " + exception);
        }

        Thread.sleep(1000);
        context.stop();
        System.exit(0);
    }

    public void configure() {
        errorHandler(noErrorHandler());
        
        // populate the message queue with some messages
        from(SOAP_ENDPOINT_URI)
            .process(new MappingProcessor(new BookStoreImpl(false)));
            

        from(REST_ENDPOINT_URI)
             .process(new MappingProcessor(new BookStoreImpl(true)));
    }
    
    // Mapping the request to object's invocation
    private static class MappingProcessor implements Processor {
        
        private Class<?> beanClass;
        private Object instance;
        
        MappingProcessor(Object obj) {
            beanClass = obj.getClass();
            instance = obj;
        }
         
        public void process(Exchange exchange) throws Exception {
            String operationName = exchange.getIn().getHeader(CxfConstants.OPERATION_NAME, String.class);
            Method method = findMethod(operationName, exchange.getIn().getBody(Object[].class));
            try {
                Object response = method.invoke(instance, exchange.getIn().getBody(Object[].class));
                exchange.getOut().setBody(response);
            }  catch (InvocationTargetException e) {
                throw (Exception)e.getCause();
            }
        }
        
        private Method findMethod(String operationName, Object[] parameters) throws SecurityException, NoSuchMethodException {            
            return beanClass.getMethod(operationName, getParameterTypes(parameters));
        }
        
        private Class<?>[] getParameterTypes(Object[] parameters) {
            if (parameters == null) {
                return new Class[0];
            }
            Class<?>[] answer = new Class[parameters.length];
            int i = 0;
            for (Object object : parameters) {
                answer[i] = object.getClass();
                i++;
            }
            return answer;
        }
    }

}