如何在骆驼中动态添加和启动路线？ [英] How in Camel to add and start routes dynamically?

问题描述

我正在尝试从骆驼的路线中删除一些样板。

I'm trying to remove some boilerplate from routes in Camel.

例如，让我们考虑两条路线，它们是相似的，并且它们的大部分内部物品可以被生成。我创建了一个组件模板，它创建了 TemplateEndpoint ，并修改了XML配置以使用该模板组件。

For example, let's consider the two routes, which are similar and most of their inner stuff could be generated. I've created a component "template", which creates TemplateEndpoint, and modifyed an XML config to use the template component.

正在从 StartupListener （在<$中定义）调用自定义方法 TemplateEndpoint.generateRoute （添加路由定义） c $ c> TemplateEndpoint.setSuffix ）。
因此，在启动Camel上下文时，路由定义会显示在上下文中，但是框架不会为其创建路由服务，因此它们不会启动。

A custom method TemplateEndpoint.generateRoute (adding route definitions) is being called from StartupListener (defined in TemplateEndpoint.setSuffix). So while Camel context starting, route definitions appear in the context, but the framework doesn't create route services for them and hence they don't get started.

如何启动添加到 StartupListener 中的路由？

How to start routes added in StartupListener?

可能是我遇到了XY问题，并且您可以为我提供一种更好的方法来实现这一目标（例如，即时添加和启动路线）。

相似的两条路线

<route id="route_A">
  <from uri="restlet:/another1?restletMethods=GET" />
  <to uri="first:run_A" />
  <to uri="second:jump_A" />     
  <to uri="third:fly_A" />
</route>

<route id="route_B">
  <from uri="restlet:/another2?restletMethods=GET" />
  <to uri="first:run_B" />
  <to uri="second:jump_B" />     
  <to uri="third:fly_B" />
</route>

修改后的XML

<route id="route_A">
  <from uri="restlet:/another1?restletMethods=GET" />
  <to uri="template://?suffix=A" />
</route>

<route id="route_B">
  <from uri="restlet:/another2?restletMethods=GET" />
  <to uri="template://?suffix=B" />
</route>

端点

public class TemplateEndpoint extends DefaultEndpoint {

  /* some methods omitted */ 
  // this endpoint creates a DefaultProducer, which does nothing

  public void setSuffix(final String suffix) throws Exception {

    this.getCamelContext().addStartupListener(new StartupListener() {
      @Override
      public void onCamelContextStarted(CamelContext context, boolean alreadyStarted) throws Exception {       
        generateRoute(suffix)
        .addRoutesToCamelContext(context);
      }
    });
  }

  private RouteBuilder generateRoute(final String suffix){ 
     final Endpoint endpoint = this;

     return new RouteBuilder() {
        @Override
        public void configure() throws Exception {
          from(endpoint)
           .to("first:run_" + suffix)
           .to("second:jump_" + suffix)
           .to("third:fly_" + suffix);
       }
  }
}

推荐答案

我将创建一个动态路线构建器，例如

I would create a dynamic route builder e.g.

public class MyRouteBuilder extends RouteBuilder {

            private String another;
            private String letter;

            public MyRouteBuilder(CamelContext context,String another, String letter) {
                super(context);
                this.another=another;
                this.letter=letter;
            }

            @Override
            public void configure() throws Exception {
                super.configure();
                from("restlet:/"+another+"?restletMethods=GET")
                .to("first:run_"+letter)
                .to("second:jump_"+letter)
                .to("third:fly_"+letter);
            }
    }

并将其添加到某个事件中，例如

and add it on some event e.g

public class ApplicationContextProvider implements ApplicationContextAware {

    @Override
    public void setApplicationContext(ApplicationContext context)
            throws BeansException {

        camelContext=(CamelContext)context.getBean("mainCamelContext");
        camelContext.addRoutes(new MyRouteBuilder(camelContext, "another1","A"));
        camelContext.addRoutes(new MyRouteBuilder(camelContext, "another2","B"));

..

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