Springcloud中Zuul的RibbonRoutingFilter有什么作用
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spring-cloud-netflix-zuul的版本是2.1.2.release.
图1是RibbonRoutingFilter的继承图
图1 类继承图
RibbonRoutingFilter是个roue类型的ZuulFilter,如下List-1所示,它的filterOrder是10; 在run方法中首先构造commandContext,之后调用内部方法forward。
List-1
@Override public String filterType() { return ROUTE_TYPE; } @Override public int filterOrder() { return RIBBON_ROUTING_FILTER_ORDER; } @Override public boolean shouldFilter() { RequestContext ctx = RequestContext.getCurrentContext(); return (ctx.getRouteHost() == null && ctx.get(SERVICE_ID_KEY) != null && ctx.sendZuulResponse()); } @Override public 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); } }
如下List-2所示,首先用ribbonCommandFactory构建RibbonCommand,之后调用RibbonCommand的execute(),这里的RibbonCommandFactory和RibbonCommand都是接口,具体实现有三个。
List-2
protected ClientHttpResponse forward(RibbonCommandContext context) throws Exception { Mapinfo = 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和RibbonCommand接口
public interface RibbonCommand extends HystrixExecutable{ } public interface RibbonCommandFactory { T create(RibbonCommandContext context); }
RibbonCommandFactory的三个实现类如下图2
图2
HttpClientRibbonCommandFactory用于构建HttpClientRibbonCommand, OkHttpRibbonCommandFactory用于构建OkHttpRibbonCommand, RestClientRibbonCommandFactory用于构建RestClientRibbonCommand。
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