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This article introduces the relevant knowledge of "what is the role of Zuul RibbonRoutingFilter in Springcloud". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The version of spring-cloud-netflix-zuul is 2.1.2.release.

Figure 1 is the inheritance diagram of RibbonRoutingFilter.

Fig. 1 inheritance diagram

RibbonRoutingFilter is a ZuulFilter of type roue, as shown in the following List-1, whose filterOrder is 10; construct commandContext first in the run method, and then call the internal method forward.

List-1

@ Overridepublic String filterType () {return ROUTE_TYPE;} @ Overridepublic int filterOrder () {return RIBBON_ROUTING_FILTER_ORDER;} @ Overridepublic boolean shouldFilter () {RequestContext ctx = RequestContext.getCurrentContext (); return (ctx.getRouteHost () = = null & & ctx.get (SERVICE_ID_KEY)! = null & & ctx.sendZuulResponse ());} @ Overridepublic Object run () {RequestContext context = RequestContext.getCurrentContext (); this.helper.addIgnoredHeaders () Try {RibbonCommandContext commandContext = buildCommandContext (context); ClientHttpResponse response = forward (commandContext); setResponse (response); return response;} catch (ZuulException ex) {throw new ZuulRuntimeException (ex);} catch (Exception ex) {throw new ZuulRuntimeException (ex);}}

As shown in List-2 below, first build RibbonCommand with ribbonCommandFactory, and then call execute () of RibbonCommand, where RibbonCommandFactory and RibbonCommand are interfaces, with three implementations.

List-2

Protected ClientHttpResponse forward (RibbonCommandContext context) throws Exception {Map info = this.helper.debug (context.getMethod (), context.getUri (), context.getHeaders (), context.getParams (), context.getRequestEntity ()); RibbonCommand command = this.ribbonCommandFactory.create (context); try {ClientHttpResponse response = command.execute (); this.helper.appendDebug (info, response.getRawStatusCode (), response.getHeaders ()) Return response;} catch (HystrixRuntimeException ex) {return handleException (info, ex);}}

List-3 RibbonCommandFactory and RibbonCommand interface

Public interface RibbonCommand extends HystrixExecutable {} public interface RibbonCommandFactory {T create (RibbonCommandContext context);}

The three implementation classes of RibbonCommandFactory are shown in figure 2 below

Figure 2

HttpClientRibbonCommandFactory is used to build HttpClientRibbonCommand, OkHttpRibbonCommandFactory is used to build OkHttpRibbonCommand, and RestClientRibbonCommandFactory is used to build RestClientRibbonCommand.

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