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| Highway |
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| <h1 id="java-chassis-3">Java Chassis 3技术解密:应用视角的配置管理</h1> |
| <p>谈论微服务配置管理的时候,最多的是以配置中心为视角,讨论其配置管理能力。 和注册中心一样,不同的配置中心会有一些关键的设计指标。 </p> |
| <ul> |
| <li>配置的格式和类型。支持不同格式和类型的配置项,比如YAML、文本、JSON、XML等。</li> |
| <li>配置的逻辑层次。比如 Kie 提供了 Label 来表达配置的层次,可以简化为应用配置、服务配置和自定义配置等;Nacos 使用 Namespace、Group等概念来表达配置的层次。 </li> |
| <li>变更通知机制。和注册中心一样,配置中心也有变更通知机制,两者的机制相似。相较而言,配置中心对于变更感知周期的的要求更低。</li> |
| <li>配置历史和推送轨迹。通过配置历史,能够了解配置项的改动记录,方便进行审计和回退,推送轨迹则帮助了解配置项被应用到了哪些微服务。 </li> |
| </ul> |
| <p>Java Chassis 3的设计目标之一,就是以应用的视角,支持不同的配置中心,并提供统一一致的使用方式。</p> |
| <p>Java Chassis 3简化了微服务定义,只包含如下核心概念:</p> |
| <ul> |
| <li>环境名称:用于表示部署环境,不同环境的微服务之间不能进行服务发现。对于不同的注册中心和配置中心,会以对应的概念表示环境。比如Nacos使用 <code>namespace</code> 来表示环境。</li> |
| <li>应用名称:用于描述一组可以相互访问的微服务,不同应用名称之间是逻辑隔离的,不能进行服务发现。对于不同的注册中心和配置中心,会以对应的概念表示应用。比如Nacos使用 <code>group</code> 来表示应用。</li> |
| <li>微服务名称:用于标识一个微服务。可以通过微服务名称查询需要访问的目标微服务。</li> |
| <li>微服务版本:表示微服务的版本。当存在微服务属性变化、接口变化的场景,建议修改版本号。</li> |
| <li>微服务描述:简单的微服务描述信息。</li> |
| <li>微服务属性:用于描述微服务的扩展信息。</li> |
| </ul> |
| <pre><code class="language-yaml">servicecomb: |
| service: |
| application: hello-applicaton |
| name: hello-service |
| version: 0.0.1 |
| properties: |
| key1: value1 |
| key2: value2 |
| description: This is a description about the microservice |
| environment: production |
| </code></pre> |
| <p>当一个微服务接入配置中心以后,Java Chassis 3的配置管理模块,会自动从配置中心获取如下配置层次的配置信息:</p> |
| <ul> |
| <li>应用配置。</li> |
| <li>服务配置。</li> |
| <li>版本配置。</li> |
| <li>自定义配置。</li> |
| </ul> |
| <p>这些配置在不同配置中心的对应关系:</p> |
| <table> |
| <thead> |
| <tr> |
| <th>项目</th> |
| <th>Nacos 配置中心</th> |
| <th>Kie 配置中心</th> |
| <th>备注</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>应用配置</td> |
| <td>namespace=environment </br>group=application </br>dataId=application</td> |
| <td>environment=environment </br>app=application</td> |
| <td></td> |
| </tr> |
| <tr> |
| <td>服务配置</td> |
| <td>namespace=environment </br>group=application </br>dataId=service</td> |
| <td>environment=environment </br>app=application </br>service=service</td> |
| <td></td> |
| </tr> |
| <tr> |
| <td>版本配置</td> |
| <td>namespace=environment </br>group=application </br>dataId=service-version</td> |
| <td>environment=environment </br>app=application </br>service=service </br>version=version</td> |
| <td></td> |
| </tr> |
| <tr> |
| <td>自定义配置</td> |
| <td>namespace=environment </br>group=group </br>dataId=dataId</td> |
| <td>customLabel=customLabelValue</td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <p>以应用视角建立这种对应关系的好处,是用户不需要自行规划如何在配置中心存放数据,可以直接将一个优秀的管理实践应用于业务场景。将用户需要思考的问题,固定为几个具体的问题:如何创建应用级别的配置?如何创建服务级别的配置?如何创建微服务自定义的配置?</p> |
| <p>应用视角的配置管理另外一个关键问题,是开发者如何使用配置。</p> |
| <ul> |
| <li>Spring Boot使用配置</li> |
| </ul> |
| <p>Spring Boot的开发者一般通过 <code>@Value</code>、<code>@ConfigurationProperties</code> 和 <code>Environment</code> 获取配置。 它提供了 <code>PropertySource</code> 来扩展配置源。 Spring Boot并未针对配置变更提供额外的处理机制,无法很好的处理配置变更。 尽管当 <code>PropertySource</code> 的内容变化后,通过 <code>Environment</code> 可以获取到最新的版本内容,但是 <code>@Value</code>、<code>@ConfigurationProperties</code> 定义的配置项则不会发生变化。 </p> |
| <ul> |
| <li>Spring Cloud使用配置</li> |
| </ul> |
| <p>Spring Cloud在Spring Boot基础之上,提供了动态配置的能力。 可以使用 <code>@RefershScope</code> 标签声明 Bean, 在配置变化后,Spring Cloud会销毁老的 Bean, 并重建新的 Bean,新的 Bean会使用最新的配置值进行初始化。 Spring Cloud在处理配置变更的过程中,会对Bean的访问加读写锁。 </p> |
| <ul> |
| <li>Java Chassis 3使用配置</li> |
| </ul> |
| <p>Java Chassis 3完全兼容 Spring Boot的配置使用方式。 并提供了更加友好的 API 监听配置变更和处理优先级配置。 配置监听 API 主要用于高性能场景:配置变更后需要进行必要的业务逻辑初始化,初始化可以在配置变更线程中执行,而不阻塞当前业务执行。 </p> |
| <pre><code class="language-java">@RestSchema(schemaId = "ProviderController") |
| @RequestMapping(path = "/") |
| public class ProviderController { |
| private DynamicProperties dynamicProperties; |
| |
| private String example; |
| |
| @Autowired |
| public ProviderController(DynamicProperties dynamicProperties) { |
| this.dynamicProperties = dynamicProperties; |
| this.example = this.dynamicProperties.getStringProperty("basic.example", |
| value -> this.example = value, "not set"); |
| } |
| } |
| </code></pre> |
| <p>优先级配置是Java Chassis3特有的管理配置优先级方式。比如对于某个方法,会考虑是否有应用级别的全局配置、针对服务的配置和针对这个方法的配置,针对方法的配置优先级最高。 这种配置方式被广泛应用于Java Chassis 3的限流等服务治理场景中。 下面的代码片段是Java Chassis的接口超时配置示例。</p> |
| <pre><code class="language-java">@InjectProperties(prefix = "servicecomb") |
| public class OperationConfig { |
| public static final List<String> CONSUMER_OP_ANY_PRIORITY = Arrays.asList( |
| "${service}.${schema}.${operation}", |
| "${service}.${schema}", |
| "${service}"); |
| |
| /** |
| * consumer request timeout |
| */ |
| @InjectProperty(keys = {"request.${op-any-priority}.timeout", "request.timeout"}, defaultValue = "30000") |
| private long msRequestTimeout; |
| } |
| </code></pre> |
| <p>相对于Spring Cloud,Java Chassis3的配置API,能够更加方便的监听配置变化,并提供了更好的性能。 </p> |
| <blockquote> |
| <blockquote> |
| <blockquote> |
| <p>客户故事:Spring Cloud配置变更会加锁。在高并发场景,配置变更会阻塞所有请求的执行。如果业务执行(已经获取读锁)包含RPC等相对慢的逻辑,配置变更等待写锁以及其他执业务线程等待读锁都会被阻塞,产生雪崩效应,触发应用吞吐急剧下降。Java Chassis 3配置变更不阻塞业务处理,能够有效的防止配置变更触发雪崩效应,特别是在高并发、需要动态调整运行、治理规则的业务场景。 </p> |
| </blockquote> |
| </blockquote> |
| </blockquote> |
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