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This article mainly introduces "what is the principle and function of Targeter in spring cloud openfeign". In daily operation, I believe that many people have doubts about the principle and function of Targeter in spring cloud openfeign. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "what is the principle and function of Targeter in spring cloud openfeign?" Next, please follow the editor to study!

Order

This paper mainly studies the Targeter of spring cloud openfeign.

Targeter

Springhouse cloudlyopenfeignMutel coreMuray 2.2.0.M1ripsources.jarroomUniverse orgAccording frameworkhand cloudhand openfeignUniverse Targeter.java

Interface Targeter {T target (FeignClientFactoryBean factory, Feign.Builder feign, FeignContext context, Target.HardCodedTarget target);}

Targeter defines the target method, which receives parameters of types FeignClientFactoryBean, Feign.Builder, FeignContext, and Target.HardCodedTarget.

DefaultTargeter

Springhouse cloudhouse openfeignhouse coreMuray 2.2.0.M1ripsources.jarroomUniverse orgAccording frameworkhand cloudhand openfeignhand DefaultTargeter.java

Class DefaultTargeter implements Targeter {@ Override public T target (FeignClientFactoryBean factory, Feign.Builder feign, FeignContext context, Target.HardCodedTarget target) {return feign.target (target);}}

DefaultTargeter implements the Targeter interface, and its target method directly uses the Feign.Builder.target method

Target

FeignMuscoreMushue 10.2.3Mutual sources.jarhammer Universe feignripple Target.java

Public interface Target {/ * The type of the interface this target applies to. Ex. {@ code Route53}. * / Class type (); / * configuration key associated with this target. For example, {@ code route53}. * / String name (); / * base HTTP URL of the target. For example, {@ code https://api/v2}. * / String url (); public Request apply (RequestTemplate input); / /.}

The Target interface defines type, name, url, apply methods.

HardCodedTarget

FeignMuscoreMushue 10.2.3Mutual sources.jarhammer Universe feignripple Target.java

Public static class HardCodedTarget implements Target {private final Class type; private final String name; private final String url; public HardCodedTarget (Class type, String url) {this (type, url, url);} public HardCodedTarget (Class type, String name, String url) {this.type = checkNotNull (type, "type"); this.name = checkNotNull (emptyToNull (name), "name"); this.url = checkNotNull (emptyToNull (url), "url") @ Override public Class type () {return type;} @ Override public String name () {return name;} @ Override public String url () {return url;} / * no authentication or other special activity. Just insert the url. * / @ Override public Request apply (RequestTemplate input) {if (input.url (). IndexOf ("http")! = 0) {input.target (url ());} return input.request ();} @ Override public boolean equals (Object obj) {if (obj instanceof HardCodedTarget) {HardCodedTarget other = (HardCodedTarget) obj Return type.equals (other.type) & & name.equals (other.name) & & url.equals (other.url);} return false;} @ Override public int hashCode () {int result = 17; result = 31 * result + type.hashCode (); result = 31 * result + name.hashCode (); result = 31 * result + url.hashCode (); return result } @ Override public String toString () {if (name.equals (url)) {return "HardCodedTarget (type=" + type.getSimpleName () + ", url=" + url + ")";} return "HardCodedTarget (type=" + type.getSimpleName () + ", name=" + name + ", url=" + url + ")";}}

HardCodedTarget implements the Target interface, and its constructor receives type, name, and url parameters. Its apply method sets the target of RequestTemplate to url if url begins with http, and then constructs request to return

HystrixTargeter

Springhouse cloudlyopenfeignMuscoreMurray 2.2.0.M1ripsources.jarroomUniverse orgAccording frameworkhand cloudhand openfeignhand HystrixTargeter.java

Class HystrixTargeter implements Targeter {@ Override public T target (FeignClientFactoryBean factory, Feign.Builder feign, FeignContext context, Target.HardCodedTarget target) {if (! (feign instanceof feign.hystrix.HystrixFeign.Builder)) {return feign.target (target);} feign.hystrix.HystrixFeign.Builder builder = (feign.hystrix.HystrixFeign.Builder) feign SetterFactory setterFactory = getOptional (factory.getName (), context, SetterFactory.class); if (setterFactory! = null) {builder.setterFactory (setterFactory);} Class fallback = factory.getFallback () If (fallback! = void.class) {return targetWithFallback (factory.getName (), context, target, builder, fallback);} Class fallbackFactory = factory.getFallbackFactory () If (fallbackFactory! = void.class) {return targetWithFallbackFactory (factory.getName (), context, target, builder, fallbackFactory);} return feign.target (target) } private T targetWithFallbackFactory (String feignClientName, FeignContext context, Target.HardCodedTarget target, HystrixFeign.Builder builder, Class fallbackFactoryClass) {FallbackFactory

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