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spring-cloud-loadbalancer.drawio
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spring-cloud-loadbalancer.drawio
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<mxCell id="khGB8-cCiWg7Y-Ce-5PI-10" value="请求处理流程<br><font color="#007fff">省略Spring MVC WebFlux&nbsp; 处理流程<br>直接看Controller层负载均衡处理</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=10;" parent="1" vertex="1">
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<mxCell id="khGB8-cCiWg7Y-Ce-5PI-12" value="@LoadBalanced WebClient.Builder<br><font color="#007fff">在BeanPostProcessor中为WebClient.Builder添加了一个过滤器</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=10;" parent="1" vertex="1">
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<mxCell id="khGB8-cCiWg7Y-Ce-5PI-15" value="@LoadBalanced RestTemplate<br><font color="#007fff">本质是在RestTemplate拦截器中注册了一个<b>负载均衡拦截LoadBalancerInterceptor</b>，<br>猜测还以为是创建了个动态代理</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=10;" parent="1" vertex="1">
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<mxCell id="khGB8-cCiWg7Y-Ce-5PI-23" value="LoadBalancerClient&nbsp;RestTemplate<br><font color="#007fff">这里默认注入的是&nbsp;BlockingLoadBalancerClient</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=10;" parent="1" vertex="1">
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<mxCell id="khGB8-cCiWg7Y-Ce-5PI-45" value="<div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff"><b>约定的默认配置：</b></font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">properties = {<b>LoadBalancerClientsProperties</b>@6009}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>clients</b> = {HashMap@6030}&nbsp; size = 0</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>healthCheck</b> = {LoadBalancerProperties$HealthCheck@6031}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; initialDelay = {Duration@6037} "PT0S"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; interval = {Duration@6038} "PT25S"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; refetchInstancesInterval = {Duration@6039} "PT25S"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; path = {LinkedCaseInsensitiveMap@6040}&nbsp; size = 0</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; port = null</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; refetchInstances = false</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; repeatHealthCheck = true</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>hint</b> = {LinkedCaseInsensitiveMap@6032}&nbsp; size = 0</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>hintHeaderName</b> = "X-SC-LB-Hint"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>retry</b> = {LoadBalancerProperties$Retry@6034}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; enabled = true</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; retryOnAllOperations = false</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; maxRetriesOnSameServiceInstance = 0</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; maxRetriesOnNextServiceInstance = 1</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; retryableStatusCodes = {HashSet@7051}&nbsp; size = 0</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; backoff = {LoadBalancerProperties$Retry$Backoff@7052}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>stickySession</b> = {LoadBalancerProperties$StickySession@6035}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; instanceIdCookieName = "sc-lb-instance-id"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; addServiceInstanceCookie = false</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>useRawStatusCodeInResponseData</b> = false</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp;<b>xForwarded</b> = {LoadBalancerProperties$XForwarded@6036}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;" color="#007fff">&nbsp; enabled = false</font></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;labelBorderColor=default;" parent="1" vertex="1">
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<mxCell id="iAYe1x8H37XBPk3sPTiQ-1" value="<div style="text-align: center;"><font style=""><font color="#000000"><b>BlockingLoadBalancerClient&nbsp;</b></font></font><span style="background-color: initial;">implements LoadBalancerClient</span></div><hr style="font-size: 10px;" size="1"><font style="font-size: 10px;"><font color="#007fff">这个并不是实际的客户端实现，从其成员字段可以看到它其实是 <b>NamedContextFactory</b>, <b>要查询某个服务<br>专属的子应用上下文还是需要通过这个Bean</b><br></font><br><span style="background-color: initial;"><div style="font-size: 10px;"><font color="#007fff">//实际类型是 LoadBalancerClientFactory，继承 NamedContextFactory&lt;<span style="background-color: initial;">LoadBalancerClientSpecification&gt;</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">private final ReactiveLoadBalancer.Factory&lt;ServiceInstance&gt; <b>loadBalancerClientFactory</b>;</span></font><br></div></span></font>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="iAYe1x8H37XBPk3sPTiQ-3" value="<font style="font-size: 9px;"><font style="font-size: 9px;">super(</font><b style="font-size: 9px;">LoadBalancerClientConfiguration</b><font style="font-size: 9px;">.class, "loadbalancer", "loadbalancer.client.name");</font><br><font style="font-size: 9px;" color="#007fff">隔离的子应用上下文中都会加载配置类</font><span style="font-size: 9px; border-color: var(--border-color);"><font style="font-size: 9px;" color="#007fff"><b>LoadBalancerClientConfiguration</b>，另外关注<br></font></span><font style="font-size: 9px;" color="#007fff"><b>LoadBalancerClientSpecification </b>定义的隔离的Bean</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
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<mxCell id="iAYe1x8H37XBPk3sPTiQ-11" value="<font style="font-size: 10px;">这里可以看到是以 serviceId (即服务名) 为name,&nbsp;隔离子应用上下文的，<br>不过 ReactorServiceInstanceLoadBalancer 实例<br>是通过 <b>NamedContextFactory</b> defautlConfigType(<b style="border-color: var(--border-color); font-size: 9px; text-align: center;">LoadBalancerClientConfiguration</b>)&nbsp;在子应用上下文&nbsp;<b>refresh</b>() 时加载的<br>即&nbsp;LoadBalancerClientConfiguration<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;fontColor=#007FFF;" parent="1" vertex="1">
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<mxCell id="iAYe1x8H37XBPk3sPTiQ-22" value="<ol><li><span style="background-color: initial;">通过NamedContextFactory机制获取serviceId对应的ReactiveLoadBalancer Bean实例，默认是</span>RoundRobinLoadBalancer<br>（即从某服务独立的子应用上下文获取其响应式<b>负载均衡器</b>）</li><li>loadBalancer先获取ServiceInstanceListSupplier Bean 然后用此Supplier获取服务实例列表，最后根据负载均衡规则选取一个服务实例并返回<br>(即负载均衡器包含一个懒加载获取ServiceInstanceListSupplier Bean的 <b>ObjectProvider</b>, 通过它获取 Supplier Bean 后，然后获取服务实例列表，最终会从 Nacos NacosReactiveDiscoveryClient 读取服务实例列表)<br></li><li>执行负载均衡器中定义的负载均衡规则，从服务实例列表中选择一个实例</li><li>通过服务实例的地址信息创建真正的请求URL, 然后借助RestTemplate执行请求</li></ol>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=top;whiteSpace=wrap;rounded=0;fontSize=10;" parent="1" vertex="1">
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<mxCell id="iAYe1x8H37XBPk3sPTiQ-33" value="return this.delegate()<br>.getIfAvailable(defaultSupplier);<br><font color="#007fff">获取&nbsp;ServiceInstanceListSupplier Bean实例<br>为空则通过defaultSupplier 创建<br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
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<mxCell id="iAYe1x8H37XBPk3sPTiQ-43" value="supplier.get(request)<br><font color="#007fff">ServiceInstanceListSupplier是<b>装饰器模式</b>组织的，会依次执行每一层get()<br>// 2<br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-2" value="<div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">this.<b>clientFactory</b> = {LoadBalancerClientFactory@9255}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp;properties = {LoadBalancerClientsProperties@9278}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp;propertySourceName = "loadbalancer"</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp;propertyName = "loadbalancer.client.name"</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp;<b>contexts</b> = {ConcurrentHashMap@9281}&nbsp; size = 1</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; "demo-provider" -&gt; {AnnotationConfigApplicationContext@9277}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp;key = "demo-provider"</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp;value = {<b>AnnotationConfigApplicationContext</b>@9277}</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; ...</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; <b>beanFactory</b> = {DefaultListableBeanFactory@10536}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp;...</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp;<b>singletonObjects</b> = {ConcurrentHashMap@10617}&nbsp; size = 22</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.cloud.loadbalancer.annotation.LoadBalancerClientConfiguration$ReactiveSupportConfiguration" -&gt; {LoadBalancerClientConfiguration$ReactiveSupportConfiguration@10530}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.context.annotation.internalConfigurationAnnotationProcessor" -&gt; {ConfigurationClassPostProcessor@10905}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "propertySourcesPlaceholderConfigurer" -&gt; {PropertySourcesPlaceholderConfigurer@10906}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "applicationStartup" -&gt; {DefaultApplicationStartup@10574}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "autoConfigurationReport" -&gt; {ConditionEvaluationReport@10909}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.context.event.internalEventListenerFactory" -&gt; {DefaultEventListenerFactory@10910}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "systemEnvironment" -&gt; {Collections$UnmodifiableMap@10912}&nbsp; size = 50</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.context.event.internalEventListenerProcessor" -&gt; {EventListenerMethodProcessor@10913}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "propertyPlaceholderAutoConfiguration" -&gt; {PropertyPlaceholderAutoConfiguration@10914}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "loadBalancerClientConfiguration" -&gt; {LoadBalancerClientConfiguration@10915}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "lifecycleProcessor" -&gt; {DefaultLifecycleProcessor@10833}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.context.annotation.internalAutowiredAnnotationProcessor" -&gt; {AutowiredAnnotationBeanPostProcessor@10917}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry" -&gt; {ConfigurationClassParser$ImportStack@10919}&nbsp; size = 0</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "applicationEventMulticaster" -&gt; {SimpleApplicationEventMulticaster@10573}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "environment" -&gt; {StandardEnvironment@10566}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.context.annotation.internalCommonAnnotationProcessor" -&gt; {CommonAnnotationBeanPostProcessor@10922}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "<b>reactorServiceInstanceLoadBalancer</b>" -&gt; {RoundRobinLoadBalancer@10802}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "<b>discoveryClientServiceInstanceListSupplier</b>" -&gt; {CachingServiceInstanceListSupplier@10523}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "systemProperties" -&gt; {Properties@10924}&nbsp; size = 70</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "xForwarderHeadersTransformer" -&gt; {XForwardedHeadersTransformer@10925}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "messageSource" -&gt; {DelegatingMessageSource@10572} "Empty MessageSource"</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; "org.springframework.cloud.loadbalancer.annotation.LoadBalancerClientConfiguration$BlockingSupportConfiguration" -&gt; {LoadBalancerClientConfiguration$BlockingSupportConfiguration@10927}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp; &nbsp; &nbsp; ...</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp;configurations = {ConcurrentHashMap@9282}&nbsp; size = 2</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp;parent = {AnnotationConfigServletWebServerApplicationContext@9283}&nbsp;</font></div><div style="font-size: 10px;"><font color="#007fff" style="font-size: 10px;">&nbsp;defaultConfigType = {Class@9284} "class org.springframework.cloud.loadbalancer.annotation.<b>LoadBalancerClientConfiguration</b>"</font></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;labelBorderColor=default;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-4" value="processInstanceResponse(supplier, serviceInstances)<br><font color="#007fff">next() 等待服务实例列表返回后，根据负载均衡规则选择一个实例回&nbsp;DefaultResponse<br>// 3<br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-28" value="<font style="font-size: 10px;" color="#007fff">如果启用健康检查、粘性会话、提示等功能<br>会加载多个ServiceInstanceListSupplier 实现<br>组织模式是<b>装饰器模式</b></font>" style="text;html=1;align=right;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-29" value="<font color="#000000" style="font-size: 10px;">Spring Cloud LoadBalancer + Nacos 不添加任何配置的话，默认就是下面这种<br><span style="font-size: 10px;">如果开启多种功能，会在中间插入其他的ServiceInstanceListSupplier实现</span><br></font><div style="font-size: 10px;"><font style="font-size: 10px;">this = {<b>CachingServiceInstanceListSupplier</b>@10523}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;">&nbsp;serviceInstances = {FluxDefer@10932} "FluxDefer"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;">&nbsp;<b>delegate</b> = {<b>DiscoveryClientServiceInstanceListSupplier</b>@10524}&nbsp;</font></div><div style="font-size: 10px;"><font style="font-size: 10px;">&nbsp; timeout = {Duration@10934} "PT30S"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;">&nbsp; serviceId = "demo-provider"</font></div><div style="font-size: 10px;"><font style="font-size: 10px;">&nbsp; serviceInstances = {FluxDefer@10935} "FluxDefer"</font></div>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;fontColor=#007FFF;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-33" value="<b>CachingServiceInstanceListSupplier</b>#get()<br><font color="#007fff">定义先从缓存中取服务实例列表，缓存为空则交给下一级（<b>delegate</b>） ServiceInstanceListSupplier get()</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-35" value="<font style="font-size: 9px;"><b>DiscoveryClientServiceInstanceListSupplier</b>#<br>get()<br><font color="#007fff">定义从服务发现服务中获取服务实例列表</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-38" value="<font size="1">中间根据配置可能有其他ServiceInstanceListSupplier<br>不过这些&nbsp;</font>Supplier 不是共存的，有些和 Cache Supplier 也不共存<font size="1"><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-45" value="return serviceInstances;<br><font color="#007fff">是Flux&lt;List&lt;ServiceInstance&gt;&gt; 类型，即数据发布者</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-47" value="serviceInstances = <b>CacheFlux</b>.<b>lookup</b>(key -&gt; {...}, delegate.getServiceId())<br>.<b>onCacheMissResume</b>(...).<b>andWriteWith</b>(...)<br><font color="#007fff">CacheFlux属于reactor-extra的逻辑，不深入了</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-50" value="<font style="font-size: 10px;" color="#007fff"><font style="font-size: 10px;">lookup: 先从缓存查询，<br>onCacheMissResume： 查询为空执行，即从下一个ServiceInstanceListSupplier#get() 获取，<br>andWriteWith： 获取成功再写入缓存<br>参考测试：&nbsp;</font>CacheFluxLoadBalancerTest#testMockLoadBalancerCacheFlux()</font>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-57" value="return serviceInstances;<br><font color="#007fff">是Flux&lt;List&lt;ServiceInstance&gt;&gt; 类型，即数据发布者</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-58" value="serviceInstances = Flux.defer(() -&gt; {...})<br>.onErrorResume(...)" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-61" value="<b>delegate</b>.getInstances(serviceId)<br>.collectList().flux()<br><font color="#007fff">这里delegate 就是配置类中创建的</font><br><font color="#007fff">&nbsp;NacosReactiveDiscoveryClient</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-63" value="Response&lt;ServiceInstance&gt; serviceInstanceResponse = <b>getInstanceResponse</b>(serviceInstances);<br><font color="#007fff">此方法中定义负载均衡规则实现</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-65" value="<div>int pos = this.position.incrementAndGet() &amp; Integer.MAX_VALUE;</div><div>ServiceInstance instance = instances.get(pos % instances.size());<span style=""></span></div><div><font color="#007fff">RoundRobin 主要实现是这两行代码</font></div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;fillColor=#fff2cc;strokeColor=#d6b656;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-67" value="return <b>ServiceInstanceListSupplier</b>.builder()<br>.withDiscoveryClient().withCaching()<br>.build(context);" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-69" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>ServiceInstanceListSupplierBuilder</b><br></p><hr style="font-size: 10px;"><font color="#007fff">&nbsp;业务中真正的ServiceInstanceListSupplier 是经过层层装饰的对象，是使用这个<br>&nbsp;Builder类构建起来的</font><br><br><font color="#007fff">//实际用于获取服务实例列表的 Supplier 的创建 Function, 比如DiscoveryClientServiceInstanceListSupplier<br></font><div>private Creator baseCreator;<span style=""><span style="white-space: pre;">&nbsp;&nbsp;</span></span></div><div><span style=""><span style="white-space: pre;"><font color="#007fff">//缓存Supplier 的创建 Function </font></span></span></div><div>private DelegateCreator cachingCreator;</div><div><font color="#007fff">//其他过滤服务实例的 Supplier 的创建 Function, 这些 Supplier 逻辑不是共存的</font></div><div>private final List&lt;DelegateCreator&gt; creators = new ArrayList&lt;&gt;();</div>" style="verticalAlign=top;align=left;overflow=fill;fontSize=10;fontFamily=Helvetica;html=1;rounded=0;shadow=0;comic=0;labelBackgroundColor=none;strokeWidth=1;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-70" value="<p style="margin: 4px 0px 0px; text-align: center;"><b>DiscoveryClientServiceInstanceListSupplier</b><br></p><hr style="font-size: 10px;"><font color="#007fff">&nbsp;</font><br><div><div>private Duration timeout = Duration.ofSeconds(30);</div><div>private final String serviceId;</div><div><font color="#007fff">// serviceInstances 是个Flux发布器，内部通过 delegate.getInstances(serviceId)&nbsp;</font></div><div><font color="#007fff">获取服务列表，而 <b>delegate 是配置类中创建的 ReactiveDiscoveryClient Bean实例</b></font></div><div>private final Flux&lt;List&lt;ServiceInstance&gt;&gt; <b>serviceInstances</b>;</div></div>" style="verticalAlign=top;align=left;overflow=fill;fontSize=10;fontFamily=Helvetica;html=1;rounded=0;shadow=0;comic=0;labelBackgroundColor=none;strokeWidth=1;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-72" value="NacosReactiveDiscoveryClient<br><font color="#007fff">Bean名：nacosReactiveDiscoveryClient</font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=10;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-73" value="<font color="#007fff" style="font-size: 10px;">太多了，梳理后面逻辑的时候<br>遇到要注入Bean再回来找</font>" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-74" value="<font style="font-size: 9px;">return Mono.justOrEmpty(serviceId)<br>.flatMapMany(this.<b>loadInstancesFromNacos</b>())<br>.subscribeOn(Schedulers.boundedElastic());</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-87" value="<div style="font-size: 9px;"><div style=""><div>@Bean</div><div>public <b>SmartInitializingSingleton</b> loadBalancedRestTemplateInitializerDeprecated(</div><div>&nbsp; &nbsp; &nbsp; &nbsp; final <b>ObjectProvider</b>&lt;List&lt;RestTemplateCustomizer&gt;&gt; <b>restTemplateCustomizers</b>) {</div><div>&nbsp; &nbsp; return () -&gt; restTemplateCustomizers.ifAvailable(customizers -&gt; {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; for (RestTemplate restTemplate : LoadBalancerAutoConfiguration.this.<b>restTemplates</b>) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; for (RestTemplateCustomizer customizer : customizers) {</div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <b>customizer</b>.customize(restTemplate);&nbsp;<font color="#007fff"> //即执行&nbsp;LoadBalancerInterceptor 的注册</font></div><div>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; &nbsp; &nbsp; }</div><div>&nbsp; &nbsp; });</div><div>}</div><div><font color="#007fff">创建 SmartInitializingSingleton Bean, 会在所有单例Bean初始化完成后调用&nbsp;afterSingletonsInstantiated() 即 这里的 lambda 表达式</font></div></div></div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=left;arcSize=3;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-90" value="<div style="font-size: 9px;"><div style="">@Bean</div><div style=""><span style="">@ConditionalOnMissingBean</span></div><div style="">public <b>RestTemplateCustomizer</b> restTemplateCustomizer(final LoadBalancerInterceptor loadBalancerInterceptor) {</div><div style=""><span style="">&nbsp; &nbsp; return restTemplate -&gt; {</span></div><div style=""><font color="#007fff">&nbsp; &nbsp; &nbsp; &nbsp; 里面将 <b>loadBalancerInterceptor</b> 添加到 restTemplate 的拦截器链中</font></div><div style=""><span style="">&nbsp; &nbsp; };</span></div><div style=""><span style="">}</span></div></div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=left;arcSize=8;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-91" value="<div style="font-size: 8px;"><div style=""><div>@Bean</div><div>public LoadBalancerInterceptor loadBalancerInterceptor(LoadBalancerClient loadBalancerClient,</div><div>&nbsp; &nbsp; &nbsp; &nbsp; LoadBalancerRequestFactory requestFactory) {</div><div>&nbsp; &nbsp; return new <b>LoadBalancerInterceptor</b>(<b>loadBalancerClient</b>, requestFactory);</div><div>}</div><div><font style="font-size: 8px;" color="#007fff">// 这里的 loadBalancerClient 和 上面的是同一个Bean</font></div></div></div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=left;arcSize=9;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-95" value="<font style="font-size: 10px;">RestTemplate 经过&nbsp;loadBalancerInterceptor<br>loadBalancerClient 处理后URL就转换成可以访问的URL了<br><font style="font-size: 10px;" color="#007fff">拦截器参考RestTemplate 源码流程图</font></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-99" value="<font style="font-size: 10px;">借助 SmartInitializingSingleton 机制</font>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-101" value="<div style="font-size: 9px;"><font style="font-size: 9px;">@Override</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">public Object <b>postProcessBeforeInitialization</b>(Object bean, String beanName) throws BeansException {</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">&nbsp; &nbsp; if (bean instanceof <b>WebClient.Builder</b>) {</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">&nbsp; &nbsp; &nbsp; &nbsp; if (context.findAnnotationOnBean(beanName, LoadBalanced.class) == null) {</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return bean;</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">&nbsp; &nbsp; &nbsp; &nbsp; }</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">&nbsp; &nbsp; &nbsp; &nbsp; ((WebClient.Builder) bean).<b>filter</b>(exchangeFilterFunction);</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">&nbsp; &nbsp; }</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">&nbsp; &nbsp; return bean;</font></div><div style="font-size: 9px;"><font style="font-size: 9px;">}</font></div><div style="font-size: 9px;"><font color="#007fff" style="font-size: 9px;">即为所有注释有 @LoadBalanced 的&nbsp;WebClient.Builder 注册&nbsp;DeferringLoadBalancerExchangeFilterFunction</font></div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=left;arcSize=2;" parent="1" vertex="1">
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<mxCell id="uEqFnHDyktXJyKcs36Fb-106" value="WebClient.builder().filter(lbFunction).build()<br>.get().uri(...).retrieve()<br>.bodyToMono(...)<br><font color="#007fff">也是注册过滤器的方式，和上面相同</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-1" value="ServiceInstanceListSupplierBuilder&nbsp;<br>Bean 实例化原理<br><font color="#007fff">研究这个流程主要是为了自定义Supplier<br>这个Bean用了装饰器模式<br></font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=10;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-4" value="<font style="font-size: 9px;">return <b>ServiceInstanceListSupplier</b>.builder()<br>.withDiscoveryClient().withCaching()<br>.build(context);<br></font><font color="#007fff">通过withXxx() 方法装配功能, Supplier初始化原理较简单略</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-6" value="DiscoveryClientServiceInstanceListSupplier 是&nbsp;" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-8" value="@LoadBalancerClient &amp;<br>@LoadBalancerClients 原理<br><font color="#007fff">其实本质就是<b>@Import</b>，源码搜索到右边两个应用场景<br></font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#d5e8d4;strokeColor=#82b366;fontSize=10;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-9" value="<font size="1">DiscoveryLoadBalancerConfiguration<br>中用于创建 HasFeatures Bean<br><font color="#007fff">HasFeatures 机制用于 Actuator 中查看引入用了哪些功能的，暂略</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=10;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-11" value="<font style=""><b style="font-size: 9px;">LoadBalancerClientConfigurationRegistrar</b><font size="1"> implements </font><b style="font-size: 9px;">ImportBeanDefinitionRegistrar</b><br><font style="" color="#007fff"><font size="1">实现了ImportBeanDefinitionRegistrar</font><br><font size="1">接口，就是用于注册BeanDefinition的</font></font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;fontSize=10;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-16" value="<font style="font-size: 10px;"><font color="#007fff">这两个注解都注释了@Import<br><span style="">@Import(LoadBalancerClientConfigurationRegistrar.class)<br></span>@Import 注解处理原理参考 Spring流程图</font><br></font>" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-18" value="注意子应用上下文（Bean容器）维护在这个Bean里<br>调试时经常需要查看子应用上下文验证一些猜想或查看效果，<br>就从这个Bean进去<br><font color="#007fff"><br></font><div><font color="#007fff">loadBalancerClient = {BlockingLoadBalancerClient@9228}&nbsp;</font></div><div><font color="#007fff">&nbsp;<b>loadBalancerClientFactory</b> = {LoadBalancerClientFactory@9226}&nbsp;</font></div><div><font color="#007fff">&nbsp; properties = {LoadBalancerClientsProperties@9586}&nbsp;</font></div><div><font color="#007fff">&nbsp; propertySourceName = "loadbalancer"</font></div><div><font color="#007fff">&nbsp; propertyName = "loadbalancer.client.name"</font></div><div><font color="#007fff">&nbsp; <b>contexts</b> = {ConcurrentHashMap@9589}&nbsp; size = 1</font></div><div><font color="#007fff">&nbsp; &nbsp;"demo-provider" -&gt; {<b>AnnotationConfigApplicationContext</b>@9225}&nbsp;</font></div>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="hy-jY-Vdd2qQ_RdFIRII-20" value="<div style="font-size: 11px;"><font color="#ea6b66" style="font-size: 11px;">这里发现 @LoadBalancerClient &amp;&nbsp;<span style="background-color: initial;">@LoadBalancerClients 引入的配置类定义的Bean <br>并不会被父应用上下文加载，什么原因？测试参考 name 和&nbsp;</span>anotherName 这两个Bean</font></div><div style="font-size: 11px;"><font color="#ea6b66"><font style="font-size: 11px;">结合之前的Spring的流程图看&nbsp;</font>beanFactory.preInstantiateSingletons() 这一步确实没有 anotherName</font></div><div style="font-size: 11px;"><font color="#ea6b66" style="font-size: 11px;"><span style="background-color: initial;">TODO&nbsp;</span><span style="background-color: initial;">LoadBalancerClientConfigurationRegistrar 处理原理</span></font></div>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;" parent="1" vertex="1">
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<mxCell id="dFHeEVBBE8L6X1gG-yMv-7" value="<div style="text-align: center;"><font color="#000000">com.netflix.loadbalancer.</font><b style="font-size: 10px; color: rgb(0, 0, 0); background-color: initial;">LoadBalancerBuilder</b></div><hr style="font-size: 10px;" size="1"><font style="font-size: 10px;"><span style="background-color: initial;">服务端服务实例描述对象<br><div style=""><span style="color: rgb(0, 0, 0); background-color: initial;"><br></span></div><div style=""><span style="background-color: initial;">//负载均衡器配置</span></div><div style=""><div><font color="#000000">private IClientConfig <b>config</b> = ClientConfigFactory</font></div><div><font color="#000000"><span style="white-space: pre;">	</span>.findDefaultConfigFactory().newConfig();</font></div><div><font color="#000000">private ServerListFilter <b>serverListFilter</b>;</font></div><div>//配置中定义的负载均衡规则</div><div><font color="#000000">private IRule <b>rule</b>;</font></div><div><font color="#000000">private IPing ping = new DummyPing();</font></div><div><font color="#000000">private ServerList <b>serverListImpl</b>;</font></div><div><font color="#000000">private ServerListUpdater serverListUpdater;</font></div><div>//传入类名，根据客户端配置config 实例化类</div><div><font color="#000000">private IClientConfigAware.Factory <b>factory</b> =&nbsp;</font></div><div><font color="#000000"><span style="white-space: pre;">	</span>ClientFactory::instantiateInstanceWithClientConfig;</font></div></div></span></font>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;fontColor=#007FFF;" parent="1" vertex="1">
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<mxCell id="dFHeEVBBE8L6X1gG-yMv-9" value="IClientConfig config = ClientConfigFactory<br>.findDefaultConfigFactory().newConfig();<br><font color="#007fff">如过没其他提名默认加载配置 <b>DefaultClientConfigImpl</b></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;align=center;" parent="1" vertex="1">
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<mxCell id="dFHeEVBBE8L6X1gG-yMv-18" value="<font style="" color="#007fff">如果引入了ribbon-archaius，会提名com.netflix.client.config.ArchaiusClientConfigFactory<br><span style="font-size: 10px;">(<b>注意</b>创建的配置类名字也是DefaultClientConfigImpl</span><span style="font-size: 10px;">但是和ribbon-core中的类不是同一个类)</span><br><span style="font-size: 10px;">如果没有提名，默认使用 DefaultClientConfigFactory</span><br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="1" vertex="1">
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<mxCell id="dFHeEVBBE8L6X1gG-yMv-19" value="<div style="text-align: center; font-size: 11px;"><font style="font-size: 11px;"><font style="font-size: 11px;" color="#000000">ribbon-<b style="">archaius</b>&nbsp;</font><font style="background-color: initial; font-size: 11px;" color="#000000">com.netflix.client.config</font><span style="background-color: initial; color: rgb(0, 0, 0);">.</span><b style="background-color: initial; color: rgb(0, 0, 0);">DefaultClientConfigImpl</b></font></div><hr style="font-size: 11px;" size="1"><font style=""><span style="background-color: initial; font-size: 10px;">默认的负载均衡器配置</span><br><span style="background-color: initial;"><div style=""><div style=""><font color="#000000"><span style="font-size: 10px;">propertyNameSpace = "ribbon"</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">vipResolver = null</span></font></div><div style=""><span style="font-size: 10px;">//</span></div><div style=""><font color="#000000"><span style="font-size: 10px;">internalProperties = {ConcurrentHashMap@1071}&nbsp; size = 0</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">dynamicProperties = {ConcurrentHashMap@1072}&nbsp; size = 0</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">changeActions = {ConcurrentHashMap@1073}&nbsp; size = 0</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">refreshCounter = {AtomicLong@1074} "0"</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">resolver = {ArchaiusPropertyResolver@1075}&nbsp;</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">clientName = ""</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">namespace = "ribbon"</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">isDynamic = false</span></font></div><div style=""><font color="#000000"><span style="font-size: 10px;">cachedToString = "ClientConfig:"</span></font></div></div></span></font>" style="verticalAlign=top;align=left;overflow=fill;fontSize=12;fontFamily=Helvetica;html=1;fontColor=#007FFF;" parent="1" vertex="1">
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