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本文主要研究一下spring cloud的FeignClientFactoryBean
FeignClientFactoryBean
spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/FeignClientFactoryBean.java
class FeignClientFactoryBean
implements FactoryBean- FeignClientFactoryBean实现了FactoryBean的getObject、getObjectType、isSingleton方法；实现了InitializingBean的afterPropertiesSet方法；实现了ApplicationContextAware的setApplicationContext方法
- getObject调用的是getTarget方法，它从applicationContext取出FeignContext，然后构造Feign.Builder并设置了logger、encoder、decoder、contract，之后通过configureFeign根据FeignClientProperties来进一步配置Feign.Builder的retryer、errorDecoder、request.Options、requestInterceptors、queryMapEncoder、decode404
- 初步配置完Feign.Builder之后再判断是否需要loadBalance，如果需要则通过loadBalance方法来设置，不需要则在Client是LoadBalancerFeignClient的时候进行unwrap
FeignClientProperties
spring-cloud-openfeign-core-2.2.0.M1-sources.jar!/org/springframework/cloud/openfeign/FeignClientProperties.java
@ConfigurationProperties("feign.client")
public class FeignClientProperties {
private boolean defaultToProperties = true;
private String defaultConfig = "default";
private Map config = new HashMap<>();
public boolean isDefaultToProperties() {
return this.defaultToProperties;
}
public void setDefaultToProperties(boolean defaultToProperties) {
this.defaultToProperties = defaultToProperties;
}
public String getDefaultConfig() {
return this.defaultConfig;
}
public void setDefaultConfig(String defaultConfig) {
this.defaultConfig = defaultConfig;
}
public Map getConfig() {
return this.config;
}
public void setConfig(Map config) {
this.config = config;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
FeignClientProperties that = (FeignClientProperties) o;
return this.defaultToProperties == that.defaultToProperties
&& Objects.equals(this.defaultConfig, that.defaultConfig)
&& Objects.equals(this.config, that.config);
}
@Override
public int hashCode() {
return Objects.hash(this.defaultToProperties, this.defaultConfig, this.config);
}
/**
* Feign client configuration.
*/
public static class FeignClientConfiguration {
private Logger.Level loggerLevel;
private Integer connectTimeout;
private Integer readTimeout;
private Class retryer;
private Class errorDecoder;
private List> requestInterceptors;
private Boolean decode404;
private Class decoder;
private Class encoder;
private Class contract;
public Logger.Level getLoggerLevel() {
return this.loggerLevel;
}
public void setLoggerLevel(Logger.Level loggerLevel) {
this.loggerLevel = loggerLevel;
}
public Integer getConnectTimeout() {
return this.connectTimeout;
}
public void setConnectTimeout(Integer connectTimeout) {
this.connectTimeout = connectTimeout;
}
public Integer getReadTimeout() {
return this.readTimeout;
}
public void setReadTimeout(Integer readTimeout) {
this.readTimeout = readTimeout;
}
public Class getRetryer() {
return this.retryer;
}
public void setRetryer(Class retryer) {
this.retryer = retryer;
}
public Class getErrorDecoder() {
return this.errorDecoder;
}
public void setErrorDecoder(Class errorDecoder) {
this.errorDecoder = errorDecoder;
}
public List> getRequestInterceptors() {
return this.requestInterceptors;
}
public void setRequestInterceptors(
List> requestInterceptors) {
this.requestInterceptors = requestInterceptors;
}
public Boolean getDecode404() {
return this.decode404;
}
public void setDecode404(Boolean decode404) {
this.decode404 = decode404;
}
public Class getDecoder() {
return this.decoder;
}
public void setDecoder(Class decoder) {
this.decoder = decoder;
}
public Class getEncoder() {
return this.encoder;
}
public void setEncoder(Class encoder) {
this.encoder = encoder;
}
public Class getContract() {
return this.contract;
}
public void setContract(Class contract) {
this.contract = contract;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
FeignClientConfiguration that = (FeignClientConfiguration) o;
return this.loggerLevel == that.loggerLevel
&& Objects.equals(this.connectTimeout, that.connectTimeout)
&& Objects.equals(this.readTimeout, that.readTimeout)
&& Objects.equals(this.retryer, that.retryer)
&& Objects.equals(this.errorDecoder, that.errorDecoder)
&& Objects.equals(this.requestInterceptors, that.requestInterceptors)
&& Objects.equals(this.decode404, that.decode404)
&& Objects.equals(this.encoder, that.encoder)
&& Objects.equals(this.decoder, that.decoder)
&& Objects.equals(this.contract, that.contract);
}
@Override
public int hashCode() {
return Objects.hash(this.loggerLevel, this.connectTimeout, this.readTimeout,
this.retryer, this.errorDecoder, this.requestInterceptors,
this.decode404, this.encoder, this.decoder, this.contract);
}
}
} - FeignClientProperties有个Map结构的config，key是feign client的名称，默认是default，value是FeignClientConfiguration；FeignClientConfiguration包含了loggerLevel、connectTimeout、readTimeout、retryer、errorDecoder、requestInterceptors、decode404、decoder、encoder、contract属性
小结
- FeignClientFactoryBean实现了FactoryBean的getObject、getObjectType、isSingleton方法；实现了InitializingBean的afterPropertiesSet方法；实现了ApplicationContextAware的setApplicationContext方法
- getObject调用的是getTarget方法，它从applicationContext取出FeignContext，然后构造Feign.Builder并设置了logger、encoder、decoder、contract，之后通过configureFeign根据FeignClientProperties来进一步配置Feign.Builder的retryer、errorDecoder、request.Options、requestInterceptors、queryMapEncoder、decode404
- 初步配置完Feign.Builder之后再判断是否需要loadBalance，如果需要则通过loadBalance方法来设置，不需要则在Client是LoadBalancerFeignClient的时候进行unwrap
doc
- FeignClientFactoryBean