我要评论前言
最近公司新老项目对接过程中使用feginclient进行调用时遇到了很多问题,在此做些简短的总结记录
一、feign的配置原理
当我们配置一个feignclient的时候,通常的写法是这样的
@feignclient("xxxclient")
public interface xxxclient{
}
当我们做这个实际上就是生成一个默认的feignclient, 其配置在org.springframework.cloud.openfeign 包下的feignclientsconfiguration
@configuration
public class feignclientsconfiguration {
@autowired
private objectfactory<httpmessageconverters> messageconverters;
@autowired(required = false)
private list<annotatedparameterprocessor> parameterprocessors = new arraylist<>();
@autowired(required = false)
private list<feignformatterregistrar> feignformatterregistrars = new arraylist<>();
@autowired(required = false)
private logger logger;
@bean
@conditionalonmissingbean
public decoder feigndecoder() {
return new optionaldecoder(new responseentitydecoder(new springdecoder(this.messageconverters)));
}
@bean
@conditionalonmissingbean
public encoder feignencoder() {
return new springencoder(this.messageconverters);
}
@bean
@conditionalonmissingbean
public contract feigncontract(conversionservice feignconversionservice) {
return new springmvccontract(this.parameterprocessors, feignconversionservice);
}
@bean
public formattingconversionservice feignconversionservice() {
formattingconversionservice conversionservice = new defaultformattingconversionservice();
for (feignformatterregistrar feignformatterregistrar : feignformatterregistrars) {
feignformatterregistrar.registerformatters(conversionservice);
}
return conversionservice;
}
@configuration
@conditionalonclass({ hystrixcommand.class, hystrixfeign.class })
protected static class hystrixfeignconfiguration {
@bean
@scope("prototype")
@conditionalonmissingbean
@conditionalonproperty(name = "feign.hystrix.enabled")
public feign.builder feignhystrixbuilder() {
return hystrixfeign.builder();
}
}
@bean
@conditionalonmissingbean
public retryer feignretryer() {
return retryer.never_retry;
}
@bean
@scope("prototype")
@conditionalonmissingbean
public feign.builder feignbuilder(retryer retryer) {
return feign.builder().retryer(retryer);
}
@bean
@conditionalonmissingbean(feignloggerfactory.class)
public feignloggerfactory feignloggerfactory() {
return new defaultfeignloggerfactory(logger);
}
}
可以看到这上面所有注入的bean都有一个注解@conditionalonmissingbean,也就没有自定义则触发创建bean
这一段bean的注入在feignclientfactorybean中的这段代码, 当服务启动时触发
protected feign.builder feign(feigncontext context) {
feignloggerfactory loggerfactory = get(context, feignloggerfactory.class);
logger logger = loggerfactory.create(type);
// @formatter:off 从spring上下文中获取对应的bean
feign.builder builder = get(context, feign.builder.class)
// required values
.logger(logger)
.encoder(get(context, encoder.class))
.decoder(get(context, decoder.class))
.contract(get(context, contract.class));
// @formatter:on
configurefeign(context, builder);
return builder;
}
二、自定义配置
这就意味着如果我们需要自定义feignclient的相关配置可以直接注入其中一个bean就可以了
类似于
@configuration
public class feignclientsconfiguration {
@bean
public decoder feigndecoder() {
return new resultdecoder();
}
@bean
public encoder feignencoder() {
return new paramencoder();
}
@bean
public contract feigncontract() {
return new defaultcontract();
}
}
如上所示, 我分别注入了decoder、encoder、contract, 而其他几项依然还是feign默认值.
三、专有配置
那么如果我想为一个client单独加一些配置又应该如何做呢?
点开@feignclient可以看到里面有一项configuration
/**
* a custom <code>@configuration</code> for the feign client. can contain override
* <code>@bean</code> definition for the pieces that make up the client, for instance
* {@link feign.codec.decoder}, {@link feign.codec.encoder}, {@link feign.contract}.
*
* @see feignclientsconfiguration for the defaults
*/
class<?>[] configuration() default {};
所以我们可以写一个如下的configuration
public class selffeignclientsconfiguration {
@bean
@conditionalonmissingbean(name = "selffeigndecoder")
public decoder selffeigndecoder() {
return new jacksondecoder();
}
}
再在feignclient上引入
@feignclient(name = "xxxclient", configuration = selffeignclientsconfiguration.class)
public interface xxxclient{
}
如此即可完成对xxxclient更细粒度的配置.
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