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new d6212b9b66 Add sentinel quick start (#1348)
d6212b9b66 is described below
commit d6212b9b6687ac9d761e56ce517aced6833b61d3
Author: Albumen Kevin <[email protected]>
AuthorDate: Mon Aug 8 15:56:08 2022 +0800
Add sentinel quick start (#1348)
---
.../java-sdk/quick-start/eco-system/rate-limit.md | 95 ++++++++++++++++++++++
1 file changed, 95 insertions(+)
diff --git a/content/zh/docs3-v2/java-sdk/quick-start/eco-system/rate-limit.md
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@@ -0,0 +1,95 @@
+---
+type: docs
+title: "限流降级"
+linkTitle: "限流降级"
+weight: 2
+description: "快速玩转 Dubbo 生态之一致性限流降级篇（Sentinel）"
+---
+
+## Sentinel 是什么
+
+随着微服务的流行，服务和服务之间的稳定性变得越来越重要。Sentinel
是面向分布式、多语言异构化服务架构的流量治理组件，主要以流量为切入点，从流量路由、流量控制、流量整形、熔断降级、系统自适应过载保护、热点流量防护等多个维度来帮助开发者保障微服务的稳定性。
+
+## 一、示例架构说明
+
+接口定义：
+
+```java
+public interface FooService {
+
+ String sayHello(String name);
+}
+```
+
+接口实现：
+
+```java
+@DubboService(timeout = 3000)
+public class FooServiceImpl implements FooService {
+
+ @Override
+ public String sayHello(String name) {
+ return String.format("Hello, %s at %s", name, LocalDateTime.now());
+ }
+}
+```
+
+限流配置：
+
+```java
+FlowRule flowRule = new FlowRule(FooService.class.getName())
+ .setCount(10)
+ .setGrade(RuleConstant.FLOW_GRADE_QPS);
+FlowRuleManager.loadRules(Collections.singletonList(flowRule));
+```
+
+## 二、快速启动示例
+
+### Step 1: 下载源码
+
+```shell script
+git clone -b master https://github.com/apache/dubbo-samples.git
+cd ./dubbo-samples-sentinel/
+```
+
+### Step 2: 构建用例
+
+执行 maven 命令，打包 demo 工程
+
+```bash
+mvn clean package
+```
+
+### Step 3: 启动 Provider
+
+```java
+java -classpath ./target/dubbo-samples-sentinel-1.0-SNAPSHOT.jar
org.apache.samples.sentinel.FooProviderBootstrap
+```
+
+### Step 4: 启动 OrderService
+
+```java
+java -classpath ./target/dubbo-samples-sentinel-1.0-SNAPSHOT.jar
org.apache.samples.sentinel.FooConsumerBootstrap
+```
+
+可以看到控制台输出中，`Blocked` 代表已经开始拦截。
+
+```
+Success: Hello, dubbo at 2022-08-08T15:42:40.809
+Success: Hello, dubbo at 2022-08-08T15:42:40.812
+Success: Hello, dubbo at 2022-08-08T15:42:40.815
+Success: Hello, dubbo at 2022-08-08T15:42:40.818
+Success: Hello, dubbo at 2022-08-08T15:42:40.821
+Success: Hello, dubbo at 2022-08-08T15:42:40.823
+Success: Hello, dubbo at 2022-08-08T15:42:40.826
+Success: Hello, dubbo at 2022-08-08T15:42:40.828
+Success: Hello, dubbo at 2022-08-08T15:42:40.830
+Success: Hello, dubbo at 2022-08-08T15:42:40.834
+Blocked
+Blocked
+Blocked
+Blocked
+Blocked
+```
+
+> 关于 Sentinel 的更多使用方式可以参考：[Sentinel 为 Dubbo
服务保驾护航](/zh/blog/2018/07/27/sentinel-为-dubbo-服务保驾护航/)，[Sentinel
官网](https://sentinelguard.io/zh-cn/index.html)
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