camel web service Component 动态署理功能

camel web service Component 动态代理功能
    随着企业信息化建设的发展，企业应用系统越来越多（某省电信软件系统有38套），而各个系统之间不是相互独立，彼此之间是有数据交互，参与建设的系统中，经常会与开通、crm等系统进行交互。就目前企业应用，主要使用web service进行接口交互。为了管理监控这些繁复多样的接口，服务集成的应用开始在企业中得到重视，在电信行业中，上至集团，下至省公司，都在加紧建设系统之间的服务集成。
    在建设的系统中采用的ibm来建设这套系统、采购ibm esb成本也很高。而在实际使用过程中esb平台被弱化为一个web service代理功能，使用的很简单。中间流量，带宽、访问次数、异常等监控还是需要自己做，esb提供的其它Component使用不到，有点大材效用。为了脱离商业软件，技术选型使用camel来实现web service代理，camel良好的技术架构和扩展点，方便我们实现接口的管理，监控。
    camel webservice 代理配置

    <cxf:cxfEndpoint id="helloWorld"
                     address="/helloworld"
                     endpointName="s:HelloWorldPort"
                     serviceName="s:HelloWorldService"
                     wsdlURL="helloWorld.wsdl"
                     xmlns:s="http://demo.cxf.starit.com/"/>                  
                     
	 <!-- a bean to enrich the input -->
    <bean id="enrichBean" class="com.starit.EnrichBean"/>

	<bean id="mySlip" class="com.starit.DynamicRouterTest"/>
	
	<bean id="camelTracer" class="org.apache.camel.processor.interceptor.Tracer">
		<property name="traceOutExchanges" value="true" />
	</bean>
	
	<bean id="traceFormatter" class="org.apache.camel.processor.interceptor.DefaultTraceFormatter">
		<property name="showOutHeaders" value="true" />
		<property name="showOutBody" value="true" />
	  	<property name="showOutBodyType" value="true" />
	</bean>
	
    <!-- this is the camel route which proxy the web service and forward it to the real web service -->
    <camelContext id="camel" trace="false" xmlns="http://camel.apache.org/schema/spring">
    	<interceptFrom>
	    	<to uri="log:received"/>
	    </interceptFrom>
        <route id="routetest">
            <!-- cxf consumer using MESSAGE format -->
            <from uri="cxf:bean:helloWorld?dataFormat=MESSAGE"/>
            <!-- enrich the input by ensure the incidentId parameter is set -->
            <to uri="bean:enrichBean"/>
            <!-- 负载均衡配置 -->
            <loadBalance>
            	<weighted distributionRatio="2 1" roundRobin="true"/>
            	<!--  
	          	<failover roundRobin="true">
	              	<exception>java.io.IOException</exception>
	          	</failover>
	          	-->
	          	<to uri="http://localhost:9000/helloWorld"/>
	          	<to uri="http://localhost:9001/helloWorld"/>
	      	</loadBalance>
            <!-- send proxied request to real web service
            <dynamicRouter>
            	<method ref="mySlip" method="slip"/>
            </dynamicRouter>
            -->
        </route>
    </camelContext>
    
    <bean class="com.starit.MyInterceptor"/>

    使用spring来配置web service endpoint和camel route。是静态配置在xml文件中。不利于业务快速变化需求，需要有一个技术方案来满足endpoint和route动态的增删改。想到只要spring能够动态装配bean和camel动态控制route就可以满足需求，经过测试方案可行。
    下面是一段测试代码

        @Override
	protected void doGet(HttpServletRequest req, HttpServletResponse response)
			throws ServletException, IOException {
		
		ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(this.getServletContext());
		DefaultListableBeanFactory acf = (DefaultListableBeanFactory) ctx.getAutowireCapableBeanFactory();
		CamelContext context = (CamelContext)ctx.getBean("camel");
		
		if(ctx.containsBean("helloWorld")) {
			acf.removeBeanDefinition("helloWorld");
			try {
				context.stopRoute("routetest1");
				context.removeRoute("routetest1");
			} catch (Exception e) {
				e.printStackTrace();
			}
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			out.println("contain helloword bean");
		} else {
			String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"+
"<beans xmlns=\"http://www.springframework.org/schema/beans\""+
"       xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\""+
"       xmlns:cxf=\"http://camel.apache.org/schema/cxf\""+
"       xsi:schemaLocation=\"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"+
"       http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf-2.5.0.xsd\">"+
"	<cxf:cxfEndpoint id=\"helloWorld\" address=\"/helloworld\" endpointName=\"s:HelloWorldPort\" serviceName=\"s:HelloWorldService\""+
"                     wsdlURL=\"helloWorld.wsdl\" xmlns:s=\"http://demo.cxf.starit.com/\"/>"+
"</beans>";
			XmlBeanFactory factory = new XmlBeanFactory(new ByteArrayResource(xml.getBytes()));
			acf.registerBeanDefinition("helloWorld", factory.getMergedBeanDefinition("helloWorld"));
			
			//添加路由规则
	        try {
				context.addRoutes(new RouteBuilder() {
					@Override
					public void configure() throws Exception {
						from("cxf:bean:helloWorld?dataFormat=MESSAGE").id("routetest1").to("bean:enrichBean")
						.to("http://localhost:9000/helloWorld?throwExceptionOnFailure=false");
					}
				});
				context.startRoute("routetest1");
			} catch (Exception e) {
				e.printStackTrace();
			}
			
			response.setContentType("text/html");
			PrintWriter out = response.getWriter();
			out.println("create new helloword bean ");
		}
	}