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| <a href="#rest" class="md-nav__link"> |
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| RPC风格 |
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| 通用功能开发 |
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| <a href="../general-development/metrics.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 应用性能监控 |
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| <li class="md-nav__item"> |
| <a href="../general-development/microservice-invocation-chain.html" class="md-nav__link"> |
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| 微服务调用链 |
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| <li class="md-nav__item"> |
| <a href="../general-development/customized-tracing.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 自定义调用链打点 |
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| 本地开发和测试 |
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| <a href="../general-development/upload-download.html" class="md-nav__link"> |
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| 文件上传下载 |
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| <li class="md-nav__item"> |
| <a href="../general-development/reactive.html" class="md-nav__link"> |
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| Reactive |
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| DNS自定义配置 |
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| <li class="md-nav__item"> |
| <a href="../general-development/proxy.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 代理设置 |
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| <a href="../general-development/report-framework-version.html" class="md-nav__link"> |
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| 框架上报版本号 |
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| <a href="../general-development/cross-app-invocation.html" class="md-nav__link"> |
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| 跨应用调用 |
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| <a href="../general-development/secret-field.html" class="md-nav__link"> |
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| 返回值序列化扩展 |
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| 跨域资源共享(CORS) |
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| <a href="../general-development/AlarmEvent.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 获取熔断与实例隔离告警事件信息 |
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| <li class="md-nav__item"> |
| <a href="../general-development/shutdown.html" class="md-nav__link"> |
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| 优雅停机 |
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| <a href="../general-development/error-handling.html" class="md-nav__link"> |
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| 异常处理 |
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| <a href="../general-development/multienvironment.html" class="md-nav__link"> |
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| 微服务实例间多环境隔离 |
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| <a href="../general-development/thread-model.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 线程模型 |
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| <a href="../general-development/config-logs.html" class="md-nav__link"> |
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| 配置日志 |
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| 多样化的通信协议功能 |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_11_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_11"> |
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| <ul class="md-nav__list" data-md-scrollfix> |
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| 多协议介绍 |
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| <a href="../transports/rest-over-vertx.html" class="md-nav__link"> |
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| REST over HTTP(Vert.x) |
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| REST over HTTP2(Vert.x) |
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| REST over Servlet(Spring Boot Embedded) |
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| <a href="../transports/rest-over-servlet.html" class="md-nav__link"> |
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| REST over Servlet(WAR) |
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| <a href="../transports/highway-rpc.html" class="md-nav__link"> |
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| Highway |
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| <span class="md-ellipsis"> |
| 多样化的服务注册与发现功能 |
| </span> |
| |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_12_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_12"> |
| <span class="md-nav__icon md-icon"></span> |
| 多样化的服务注册与发现功能 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <li class="md-nav__item"> |
| <a href="../registry/introduction.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 注册发现介绍 |
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| <li class="md-nav__item"> |
| <a href="../registry/service-center.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 使用Service Center |
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| |
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| <li class="md-nav__item"> |
| <a href="../registry/nacos.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Nacos |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
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| |
| |
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| <li class="md-nav__item"> |
| <a href="../registry/zookeeper.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用ZooKeeper |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
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| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../registry/local-registry.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 本地注册发现 |
| </span> |
| |
| |
| </a> |
| </li> |
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| |
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| |
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| |
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| |
| <li class="md-nav__item"> |
| <a href="../registry/distributed.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 去中心化注册发现 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_13" > |
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| |
| <label class="md-nav__link" for="__nav_13" id="__nav_13_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 多样化的配置管理功能 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_13_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_13"> |
| <span class="md-nav__icon md-icon"></span> |
| 多样化的配置管理功能 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <li class="md-nav__item"> |
| <a href="../config/general-config.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 服务配置介绍 |
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| <li class="md-nav__item"> |
| <a href="../config/read-config.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 在程序中读取配置信息 |
| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../config/kie.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Kie |
| </span> |
| |
| |
| </a> |
| </li> |
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| |
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| <li class="md-nav__item"> |
| <a href="../config/nacos.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Nacos |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../config/zookeeper.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 使用Zookeeper |
| </span> |
| |
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| </a> |
| </li> |
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| |
| |
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| <li class="md-nav__item"> |
| <a href="../config/apollo.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Apollo |
| </span> |
| |
| |
| </a> |
| </li> |
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| |
| |
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| <li class="md-nav__item"> |
| <a href="../config/cse1.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 使用CSE1.0配置中心 |
| </span> |
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| </li> |
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| </ul> |
| </nav> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_14" > |
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| <label class="md-nav__link" for="__nav_14" id="__nav_14_label" tabindex="0"> |
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| <span class="md-ellipsis"> |
| 服务治理功能参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_14_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_14"> |
| <span class="md-nav__icon md-icon"></span> |
| 服务治理功能参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <li class="md-nav__item"> |
| <a href="../references-handlers/rule-governance.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 流量特征治理 |
| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../references-handlers/governance-best-practise.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 流量特征治理最佳实践 |
| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../references-handlers/loadbalance.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 负载均衡 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../references-handlers/ratelimit.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 限流 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../references-handlers/router.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 灰度发布 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../references-handlers/fault-injection.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 故障注入 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../references-handlers/fail-retry.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 快速失败和重试 |
| </span> |
| |
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| </a> |
| </li> |
| |
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| </ul> |
| </nav> |
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| </li> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_15" > |
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| <label class="md-nav__link" for="__nav_15" id="__nav_15_label" tabindex="0"> |
| |
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| <span class="md-ellipsis"> |
| 网关功能参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_15_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_15"> |
| <span class="md-nav__icon md-icon"></span> |
| 网关功能参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
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| |
| |
| |
| |
| |
| <li class="md-nav__item"> |
| <a href="../edge/open-service.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 介绍 |
| </span> |
| |
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| </a> |
| </li> |
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| |
| <li class="md-nav__item"> |
| <a href="../edge/by-servicecomb-sdk.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用 Edge Service 做网关 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../edge/zuul.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用 `zuul` 和 `spring cloud gateway` 做网关 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../edge/nginx.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| nginx 网关简单介绍 |
| </span> |
| |
| |
| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
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| <li class="md-nav__item md-nav__item--nested"> |
| |
| |
| |
| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_16" > |
| |
| |
| <label class="md-nav__link" for="__nav_16" id="__nav_16_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 安全特性参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_16_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_16"> |
| <span class="md-nav__icon md-icon"></span> |
| 安全特性参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../references-handlers/publickey.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 公钥认证 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../security/tls.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 使用TLS通信 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../security/shi-yong-rsa-ren-zheng.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用RSA认证 |
| </span> |
| |
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| </a> |
| </li> |
| |
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| </ul> |
| </nav> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_17" > |
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| <label class="md-nav__link" for="__nav_17" id="__nav_17_label" tabindex="0"> |
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| <span class="md-ellipsis"> |
| 专题文章 |
| </span> |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_17_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_17"> |
| <span class="md-nav__icon md-icon"></span> |
| 专题文章 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
| |
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| |
| <li class="md-nav__item"> |
| <a href="../featured-topics/features.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 特性介绍 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/secrets.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 技术解密 |
| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/upgrading.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 升级指导 |
| </span> |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/compatibility.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 兼容问题和兼容性策略 |
| </span> |
| |
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| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../featured-topics/performance.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 性能问题分析和调优 |
| </span> |
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| </li> |
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| </ul> |
| </nav> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_18" > |
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| <label class="md-nav__link" for="__nav_18" id="__nav_18_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 常用配置项参考 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_18_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_18"> |
| <span class="md-nav__icon md-icon"></span> |
| 常用配置项参考 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <li class="md-nav__item"> |
| <a href="../config-reference/rest-transport-client.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| REST Transport Client 配置项 |
| </span> |
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| </a> |
| </li> |
| |
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| |
| |
| </ul> |
| </nav> |
| |
| </li> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_19" > |
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| |
| <label class="md-nav__link" for="__nav_19" id="__nav_19_label" tabindex="0"> |
| |
| |
| <span class="md-ellipsis"> |
| 常见问题 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_19_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_19"> |
| <span class="md-nav__icon md-icon"></span> |
| 常见问题 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <li class="md-nav__item"> |
| <a href="../question-and-answer/faq.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| FAQ |
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| <li class="md-nav__item"> |
| <a href="../question-and-answer/question_answer.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| Q & A |
| </span> |
| |
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| </a> |
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| <li class="md-nav__item"> |
| <a href="../question-and-answer/interface-compatibility.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 微服务接口兼容常见问题 |
| </span> |
| |
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| </a> |
| </li> |
| |
| |
| |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
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| |
| </ul> |
| </nav> |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| <div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" > |
| <div class="md-sidebar__scrollwrap"> |
| <div class="md-sidebar__inner"> |
| |
| |
| <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> |
| |
| |
| |
| |
| |
| |
| <label class="md-nav__title" for="__toc"> |
| <span class="md-nav__icon md-icon"></span> |
| Table of contents |
| </label> |
| <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix> |
| |
| <li class="md-nav__item"> |
| <a href="#_2" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 接口定义的最佳实践和类型约束 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#code-first" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 从 code first 角度理解夸平台数据类型的约束 |
| </span> |
| </a> |
| |
| <nav class="md-nav" aria-label="从 code first 角度理解夸平台数据类型的约束"> |
| <ul class="md-nav__list"> |
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| <li class="md-nav__item"> |
| <a href="#_3" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 关于数据结构和接口变更 |
| </span> |
| </a> |
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| </li> |
| |
| </ul> |
| </nav> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_4" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 协议上的差异 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_5" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 泛型支持 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#_6" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| 其他常见问题 |
| </span> |
| </a> |
| |
| </li> |
| |
| <li class="md-nav__item"> |
| <a href="#rest" class="md-nav__link"> |
| <span class="md-ellipsis"> |
| REST 通信类型扩展 |
| </span> |
| </a> |
| |
| </li> |
| |
| </ul> |
| |
| </nav> |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| <div class="md-content" data-md-component="content"> |
| <article class="md-content__inner md-typeset"> |
| |
| |
| |
| |
| <h1 id="_1">接口定义和数据类型</h1> |
| <p>不论采用 <code>JAX-RS</code>、<code>Spring MVC</code>,还是采用 <code>透明RPC</code> 开发,都涉及接口的返回值和参数。java-chassis |
| 采用的是一种平台无关的数据序列化方式,当 <code>Transport</code> 为 <code>REST</code> 的时候,序列化方式为 <code>json</code>,当 |
| <code>Transport</code> 为 <code>Highway</code> 的时候,序列化方式为 <code>protobuffer</code>。 平台无关的数据序列化方式有个基本 |
| 特征:作为 <code>Consumer</code>, 从序列化的数据中,无法获取任何和 <code>Consuemr</code> 开发语言有关的类型信息。 平台无关 |
| 特性给接口定义的数据类型提供了更严格的要求,符合这些要求的接口定义,一方面运行更加高效,另外一方面更加方便的 |
| 动态调整 <code>Transport</code>, 而无需对代码做出修改。 </p> |
| <p>对于 <code>REST</code>, 虽然 <code>json</code> 本身不包含特定平台的类型信息,但是 <code>JAVA</code> 可以通过在反序列化的时候,指定目标 |
| 类型,所以对于 <code>REST</code>, 可以更加灵活的使用不同的类型。 </p> |
| <p>本章节主要介绍为了实现最大的夸平台和高性能,开发者定义接口的最佳实践。同时介绍在使用 <code>REST</code> 的情况下,如何 |
| 更加灵活的支持不同的类型。 </p> |
| <h2 id="_2">接口定义的最佳实践和类型约束</h2> |
| <p>java-chassis 的所有接口定义,都可以生成符合 <code>OpenAPI</code> 的 <code>swagger</code> 接口描述,当使用 <code>Highway</code> 协议时, |
| <code>swagger</code> 文件还会在内部被转换为等价的 <code>proto</code> 文件。 接口定义的最佳实践需要满足 <code>OpenAPI</code> 和 <code>proto</code>的 |
| 数据类型要求。 </p> |
| <ul> |
| <li><code>OpenAPI</code> 定义了如下一些基本类型:</li> |
| </ul> |
| <p>下面列举一些常见的类型说明,详细参考 <a href="https://swagger.io/docs/specification/data-models/data-types/">OpenAPI文档</a>。</p> |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left;">type</th> |
| <th style="text-align: left;">format</th> |
| <th style="text-align: left;">java</th> |
| <th style="text-align: left;">说明</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left;">string</td> |
| <td style="text-align: left;">-</td> |
| <td style="text-align: left;">String</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">string</td> |
| <td style="text-align: left;">date</td> |
| <td style="text-align: left;">java.util.Date, java.time.LocalDate</td> |
| <td style="text-align: left;">推荐使用 LocalDate</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">string</td> |
| <td style="text-align: left;">date-time</td> |
| <td style="text-align: left;">java.util.Date, java.time.LocalDateTime</td> |
| <td style="text-align: left;">推荐使用 LocalDateTime</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">number</td> |
| <td style="text-align: left;">-</td> |
| <td style="text-align: left;">double</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">number</td> |
| <td style="text-align: left;">float</td> |
| <td style="text-align: left;">float</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">number</td> |
| <td style="text-align: left;">double</td> |
| <td style="text-align: left;">double</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">integer</td> |
| <td style="text-align: left;">-</td> |
| <td style="text-align: left;">integer</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">integer</td> |
| <td style="text-align: left;">int32</td> |
| <td style="text-align: left;">int</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">integer</td> |
| <td style="text-align: left;">int64</td> |
| <td style="text-align: left;">long</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">boolean</td> |
| <td style="text-align: left;">-</td> |
| <td style="text-align: left;">boolean</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">array</td> |
| <td style="text-align: left;"></td> |
| <td style="text-align: left;">ArrayList</td> |
| <td style="text-align: left;">必须指定类型</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">object</td> |
| <td style="text-align: left;"></td> |
| <td style="text-align: left;"></td> |
| <td style="text-align: left;">由上面的属性构成的对象类型。包括字典(HashMap),字典的 key 必须为 string</td> |
| </tr> |
| </tbody> |
| </table> |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left;">参数类型</th> |
| <th style="text-align: left;">通信协议</th> |
| <th style="text-align: left;">编码方式</th> |
| <th style="text-align: left;">是否支持</th> |
| <th style="text-align: left;">备注</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left;">Query</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean, array</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Path</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Header</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Cookie</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">application/x-www-form-urlencoded</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">multipart/form-data</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">application/json</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HTTP/HTTP2</td> |
| <td style="text-align: left;">application/protobuf</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Query</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean, array</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Path</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Header</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Cookie</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">TEXT</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;">支持string, number, boolean</td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">application/x-www-form-urlencoded</td> |
| <td style="text-align: left;">否</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">multipart/form-data</td> |
| <td style="text-align: left;">否</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">application/json</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">Body</td> |
| <td style="text-align: left;">HIGHWAY</td> |
| <td style="text-align: left;">application/protobuf</td> |
| <td style="text-align: left;">是</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| </tbody> |
| </table> |
| <ul> |
| <li><code>proto</code> 定义了如下一些基本类型:</li> |
| </ul> |
| <p>下面列举一些常见的类型说明,详细参考 <a href="https://docs.microsoft.com/en-us/dotnet/architecture/grpc-for-wcf-developers/protobuf-data-types">Proto Buffer类型说明</a>。</p> |
| <table> |
| <thead> |
| <tr> |
| <th style="text-align: left;">type</th> |
| <th style="text-align: left;">java</th> |
| <th style="text-align: left;">说明</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td style="text-align: left;">double</td> |
| <td style="text-align: left;">double</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">float</td> |
| <td style="text-align: left;">float</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">int32</td> |
| <td style="text-align: left;">int</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">int64</td> |
| <td style="text-align: left;">long</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">uint32</td> |
| <td style="text-align: left;">int</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">uint64</td> |
| <td style="text-align: left;">long</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">sint32</td> |
| <td style="text-align: left;">int</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">sint64</td> |
| <td style="text-align: left;">long</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">fixed32</td> |
| <td style="text-align: left;">int</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">fixed64</td> |
| <td style="text-align: left;">long</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">sfixed32</td> |
| <td style="text-align: left;">int</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">sfixed64</td> |
| <td style="text-align: left;">long</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">bool</td> |
| <td style="text-align: left;">boolean</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">string</td> |
| <td style="text-align: left;">String</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">bytes</td> |
| <td style="text-align: left;">ByteString</td> |
| <td style="text-align: left;"></td> |
| </tr> |
| <tr> |
| <td style="text-align: left;">map</td> |
| <td style="text-align: left;"></td> |
| <td style="text-align: left;">字典类型</td> |
| </tr> |
| </tbody> |
| </table> |
| <p><code>OpenAPI</code> 的 <code>date</code> format 在 <code>proto</code> 里面采用 <code>long</code> 表示。 java-chassis 的开发实践分为 <code>code first</code> |
| 和 <code>contrast first</code> 两种模式, 如果采用 <code>contrast first</code> 模式,先写 <code>swagger</code>, 然后通过 <code>swagger</code> 生成 |
| 代码, 这种方式生成的数据类型都是符合最佳实践的。 如果采用 <code>code first</code>, 要考虑哪些类型是最佳实践,可以从思考定义 |
| 的 JAVA 类型,对应的 <code>swagger</code> 是什么样子的。 当然这样思考,对于不熟悉 <code>swagger</code> 或者 <code>proto</code> 的开发者 |
| 还是显得复杂。 下面从 <code>code first</code> 的角度描述使用哪些类型是最佳实践。 </p> |
| <h2 id="code-first">从 <code>code first</code> 角度理解夸平台数据类型的约束</h2> |
| <p>开发者不能在接口定义的时候使用如下类型:</p> |
| <ul> |
| <li> |
| <p>抽象的数据结构: java.lang.Object, net.sf.json.JsonObject 等。 使用这些类型 java-chassis 启动 |
| 不会报错,功能也是正常的。但不是最佳实践,也会对性能有一定影响。 </p> |
| </li> |
| <li> |
| <p>接口或者抽象类</p> |
| <pre><code>```java |
| public interface IPerson {//...} |
| public abstract class AbstractPerson {//...} |
| ``` |
| </code></pre> |
| </li> |
| <li> |
| <p>上述类型的集合类型或者没有指定具体类型的集合,比如:<code>List<IPerson>, Map<String, PersonHolder<?>>, List, Map</code>等。 <code>List<String>, List<Person></code> 这些具体类型是支持的。</p> |
| </li> |
| <li> |
| <p>包含上述类型作为属性的类型</p> |
| <pre><code>```java |
| public class GroupOfPerson {IPerson master //...} |
| ``` |
| </code></pre> |
| </li> |
| </ul> |
| <p>不用担心记不住这些约束,程序会在启动的时候检查不支持的类型,并给与错误提示。</p> |
| <p>总之,数据结构需要能够使用简单的数据类型进行描述,一目了然就是最好的。这个在不同的语言,不同的协议里面都支持的很 |
| 好,长期来看,可以大大减少开发者联调沟通和后期重构的成本。</p> |
| <h3 id="_3">关于数据结构和接口变更</h3> |
| <p>接口名称、参数类型、参数顺序、返回值类型变更都属于接口变更。ServiceComb启动的时候,会根据版本号检测接口变化, |
| 接口变化要求修改版本号。ServiceComb识别接口是否变化是通过代码生成的契约内容,有些不规范的接口定义可能导致在 |
| 代码没有变化的情况下,生成的契约不同。比如:</p> |
| <pre><code>public void get(Person p) |
| class Person { |
| private String value; |
| private boolean isOk; |
| public String getName() {return value} |
| public boolean isOk() {return isOK} |
| } |
| </code></pre> |
| <p>这个接口通过access method定义了"name"和"ok"两个属性,和实际的字段"value"和"isOk"不同。这种情况可能导 |
| 致每次启动生成的契约不一样。需要将代码调整为符合JAVA Bean规范的定义。</p> |
| <pre><code>public void get(Person p) |
| class Person { |
| private String name; |
| private boolean ok; |
| public String getName() {return name} |
| public boolean isOk() {return ok} |
| } |
| </code></pre> |
| <p>或者通过JSON标注,显示的指明字段顺序。比如:</p> |
| <pre><code>public void get(Person p) |
| @JsonPropertyOrder({"name", "ok"}) |
| class Person { |
| private String value; |
| private boolean isOk; |
| public String getName() {return value} |
| public boolean isOk() {return isOK} |
| } |
| </code></pre> |
| <p>考虑到接口变更的影响,建议在进行对外接口定义的时候,尽可能不要使用第三方软件提供的类作为接口参数,而是使 |
| 用自定义的POJO类。一方面升级三方件的时候,可能感知不到接口变化;另外一方面,如果出现问题,无法通过 |
| 修改第三方代码进行规避。比如:java.lang.Timestamp, org.joda.time.JodaTime等。</p> |
| <h2 id="_4">协议上的差异</h2> |
| <p>尽管 ServiceComb-Java-Chassis 实现了不同协议之间开发方式的透明,受限于底层协议的限制,不同的协议存在少量差异。</p> |
| <ul> |
| <li> |
| <p>map,key只支持 string</p> |
| </li> |
| <li> |
| <p>highway (protobuf限制) </p> |
| <ol> |
| <li>不支持在网络上传递null,包括Collection、array中的元素,map的value </li> |
| <li>长度为0的数组、list,不会在网络上传递,接收端解码出来就是默认值</li> |
| </ol> |
| </li> |
| <li> |
| <p>springmvc </p> |
| <ol> |
| <li>不支持 Date 作为 path、query 参数。 因为springmvc 直接将 Date 做 toString 放在path、query中,与 |
| swagger的标准不匹配。</li> |
| </ol> |
| </li> |
| </ul> |
| <h2 id="_5">泛型支持</h2> |
| <p>ServiceComb-Java-Chassis 支持REST传输方式下的泛型请求参数和返回值。例如使用一个泛型的数据类型:</p> |
| <pre><code class="language-java">public class Generic<T>{ |
| public T value; |
| } |
| </code></pre> |
| <p>其中的泛型属性T可以是一个实体类、java.util.Date、枚举,也可以嵌套泛型数据类型。</p> |
| <p>当用户使用隐式契约功能自动生成微服务契约时,需要在provider接口方法的返回消息中明确指定泛型类型,以保 |
| 证 ServiceComb-Java-Chassis 生成的契约中包含足够的接口信息。例如,当provider端接口方法代码为</p> |
| <pre><code class="language-java">public Holder<List<Person>> getHolderListArea() { |
| Holder<List<Person>> response = new Holder<>(); |
| // ommited |
| return response; |
| } |
| </code></pre> |
| <p>时, ServiceComb-Java-Chassis 能够识别出泛型返回对象的确切信息,以保证consumer端接收到的应答消息能够被 |
| 正确地反序列化。而如果provider端接口方法的代码为</p> |
| <pre><code class="language-java">public Holder getHolderListArea() { |
| Holder<List<Person>> response = new Holder<>(); |
| // ommited |
| return response; |
| } |
| </code></pre> |
| <p>时,由于契约中缺少List元素的类型信息,就会出现consumer端无法正确反序列化应答的情况,比如consumer接收 |
| 到的参数类型可能会变为<code>Holder<List<Map<String,String>>></code>,<code>Person</code>对象退化为Map类型。</p> |
| <blockquote> |
| <p><strong><em>说明:</em></strong> <br /> |
| 虽然 ServiceComb-Java-Chassis 支持REST泛型参数,但是我们更加推荐用户使用实体类作为参数,以获得 |
| 更加明确的接口语义。</p> |
| </blockquote> |
| <h2 id="_6">其他常见问题</h2> |
| <ul> |
| <li>使用 RestTemplate 传递 raw json</li> |
| </ul> |
| <p>假设服务端定义了接口</p> |
| <pre><code>Person test(Person input) |
| </code></pre> |
| <p>用户期望使用RestTemplate自行拼接json字符串,然后进行传递:</p> |
| <pre><code> String personStr = JsonUtils.writeValueAsString(input); |
| result = template.postForObject(cseUrlPrefix + "sayhello", personStr, Person.class); |
| </code></pre> |
| <p>ServiceComb不推荐开发者这样使用,里面的处理逻辑存在大量歧义。如果必须使用,需要满足几个约束:Person |
| 必须包含带String类型的构造函数;provider/consumer都必须存在这个Person类型。</p> |
| <h2 id="rest"><code>REST</code> 通信类型扩展</h2> |
| <p>默认情况下, 如果在接口中使用 <code>interface</code> 或者 <code>abstract class</code> 作为参数或者返回值, java-chassis |
| 启动会报告错误。 java-chassis 提供了类型扩展机制, 使得程序中可以支持各种类型。 </p> |
| <p>***注意: *** 使用扩展机制的接口,只能够在 <code>REST</code> 通信模式下使用。</p> |
| <p>以支持 <code>spring-data</code> 的 <code>Page</code> 接口作为返回值为例, 首先需要通过 <code>SPI</code> 的机制实现 <code>jackson</code> 的类型扩展:</p> |
| <pre><code class="language-java">public class SpringDataModule extends SimpleModule implements SPIOrder { |
| private static final long serialVersionUID = 1L; |
| |
| @JsonDeserialize(as = PageImpl.class) |
| @JsonPropertyOrder(alphabetic = true) |
| public static class PageMixin<T> { |
| @JsonCreator |
| public PageMixin(@JsonProperty(value = "content") List<T> content, |
| @JsonProperty("pageable") Pageable pageable, |
| @JsonProperty("total") long total) { |
| } |
| } |
| |
| @JsonDeserialize(as = PageRequest.class) |
| @JsonPropertyOrder(alphabetic = true) |
| public static class PageableMixin { |
| @JsonCreator |
| public PageableMixin(@JsonProperty(value = "pageNumber") int page, |
| @JsonProperty("pageSize") int size, @JsonProperty(value = "sort") Sort sort) { |
| } |
| } |
| |
| @JsonPropertyOrder(alphabetic = true) |
| @JsonDeserialize(as = Sort.class) |
| public static class SortMixin { |
| // Notice: |
| // spring data model changed from version to version |
| // for the tested version, sort is not consistency in serialization and deserialization |
| @JsonCreator |
| public SortMixin(String... properties) { |
| } |
| } |
| |
| public SpringDataModule() { |
| super("springData"); |
| |
| setMixInAnnotation(Page.class, PageMixin.class); |
| setMixInAnnotation(Pageable.class, PageableMixin.class); |
| setMixInAnnotation(Sort.class, SortMixin.class); |
| |
| setMixInAnnotation(PageImpl.class, PageMixin.class); |
| setMixInAnnotation(PageRequest.class, PageableMixin.class); |
| } |
| |
| @Override |
| public Object getTypeId() { |
| return getModuleName(); |
| } |
| |
| @Override |
| public int getOrder() { |
| return Short.MAX_VALUE; |
| } |
| } |
| </code></pre> |
| <p>再实现 <code>SPI</code> 告诉 java-chassis 跳过类型检查:</p> |
| <pre><code class="language-java">public class SpringDataConcreteTypeRegister implements ConcreteTypeRegister { |
| @Override |
| public void register(Set<Type> types) { |
| types.add(Page.class); |
| types.add(Pageable.class); |
| } |
| } |
| </code></pre> |
| <p>经过这两个步骤(步骤中没描述开发SPI 需要增加 services 文件的内容), 就能够实现任意类型的支持。 需要注意,这些扩展,必须 |
| 同时包含在 <code>Consumer</code>, <code>Provider</code>, <code>edge service</code> 中,因为这种处理方式是依赖于平台类型的非夸平台特性。 </p> |
| <p>上述例子的详细代码可以参考 java-chassis 的源代码, generator-spring-data 模块。 </p> |
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