增加Spring Cloud Gateway兼容Hystrix的线程隔离

discovery-plugin-strategy-starter-gateway/src/main/java/com/nepxion/discovery/plugin/strategy/gateway/configuration/GatewayStrategyAutoConfiguration.java

@@ -20,6 +20,8 @@ import com.nepxion.discovery.plugin.strategy.adapter.DiscoveryEnabledAdapter;
 import com.nepxion.discovery.plugin.strategy.constant.StrategyConstant;
 import com.nepxion.discovery.plugin.strategy.gateway.adapter.DefaultDiscoveryEnabledAdapter;
 import com.nepxion.discovery.plugin.strategy.gateway.filter.GatewayStrategyFilter;
+import com.nepxion.discovery.plugin.strategy.gateway.wrapper.DefaultCallableWrapper;
+import com.nepxion.discovery.plugin.strategy.wrapper.CallableWrapper;
 
 @Configuration
 @AutoConfigureBefore(RibbonClientConfiguration.class)
@@ -35,4 +37,10 @@ public class GatewayStrategyAutoConfiguration {
     public DiscoveryEnabledAdapter discoveryEnabledAdapter() {
         return new DefaultDiscoveryEnabledAdapter();
     }
+
+    @Bean
+    @ConditionalOnProperty(value = StrategyConstant.SPRING_APPLICATION_STRATEGY_HYSTRIX_THREADLOCAL_SUPPORTED, matchIfMissing = false)
+    public CallableWrapper callableWrapper() {
+        return new DefaultCallableWrapper();
+    }
 }
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discovery-plugin-strategy-starter-gateway/src/main/java/com/nepxion/discovery/plugin/strategy/gateway/wrapper/DefaultCallableWrapper.java

+package com.nepxion.discovery.plugin.strategy.gateway.wrapper;
+
+/**
+ * <p>Title: Nepxion Discovery</p>
+ * <p>Description: Nepxion Discovery</p>
+ * <p>Copyright: Copyright (c) 2017-2050</p>
+ * <p>Company: Nepxion</p>
+ * @author Haojun Ren
+ * @author Hao Huang
+ * @version 1.0
+ */
+
+import java.util.concurrent.Callable;
+
+import org.springframework.web.server.ServerWebExchange;
+
+import com.nepxion.discovery.plugin.strategy.gateway.context.GatewayStrategyContext;
+import com.nepxion.discovery.plugin.strategy.wrapper.CallableWrapper;
+
+public class DefaultCallableWrapper implements CallableWrapper {
+    @Override
+    public <T> Callable<T> wrapCallable(Callable<T> delegate) {
+        ServerWebExchange exchange = GatewayStrategyContext.getCurrentContext().getExchange();
+
+        return new Callable<T>() {
+            @Override
+            public T call() throws Exception {
+                try {
+                    GatewayStrategyContext.getCurrentContext().setExchange(exchange);
+
+                    return delegate.call();
+                } finally {
+                    GatewayStrategyContext.clearCurrentContext();
+                }
+            }
+        };
+    }
+}
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discovery-springcloud-example-gateway/pom.xml

@@ -82,6 +82,12 @@
             <artifactId>discovery-plugin-strategy-starter-gateway</artifactId>
         </dependency>
 
+        <!-- 当Spring Coud Gateway用Hystrix做线程隔离的时候，才需要导入下面的包 -->
+        <!-- <dependency>
+            <groupId>com.nepxion</groupId>
+            <artifactId>discovery-plugin-strategy-starter-hystrix</artifactId>
+        </dependency> -->
+
         <dependency>
             <groupId>de.codecentric</groupId>
             <artifactId>spring-boot-admin-starter-client</artifactId>

discovery-springcloud-example-gateway/src/main/java/com/nepxion/discovery/plugin/example/gateway/impl/MyFallback.java

+package com.nepxion.discovery.plugin.example.gateway.impl;
+
+/**
+ * <p>Title: Nepxion Discovery</p>
+ * <p>Description: Nepxion Discovery</p>
+ * <p>Copyright: Copyright (c) 2017-2050</p>
+ * <p>Company: Nepxion</p>
+ * @author Haojun Ren
+ * @version 1.0
+ */
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class MyFallback {
+    @RequestMapping("/fallback")
+    public String fallback() {
+        return "Spring Cloud Gateway Fallback";
+    }
+}
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discovery-springcloud-example-gateway/src/main/resources/application.properties

@@ -29,3 +29,10 @@ spring.cloud.gateway.routes[0].predicates[0]=Path=/discovery-springcloud-example
 # Gateway如果用Consul做服务注册发现中心，必须配置StripPrefix=1，其他配置中心配不配无所谓，但建议都配
 spring.cloud.gateway.routes[0].filters[0]=StripPrefix=1
 spring.cloud.gateway.routes[0].uri=lb://discovery-springcloud-example-a
+
+# Hystrix配置
+spring.cloud.gateway.routes[0].filters[0].name=Hystrix
+spring.cloud.gateway.routes[0].filters[0].args.name=default
+spring.cloud.gateway.routes[0].filters[0].args.fallbackUri=forward:/fallback
+hystrix.command.default.execution.isolation.strategy=thread
+hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=3000
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discovery-springcloud-example-gateway/src/main/resources/bootstrap.properties

@@ -75,3 +75,5 @@ spring.boot.admin.client.url=http://localhost:5555
 # spring.application.strategy.zone.avoidance.rule.enabled=true
 # 路由策略过滤器的执行顺序（Order）。缺失则默认为9000
 # spring.application.strategy.gateway.route.filter.order=9000
+# 开启Spring Cloud Gateway网关上实现Hystrix线程隔离模式做服务隔离时，必须把spring.application.strategy.hystrix.threadlocal.supported设置为true，同时要引入discovery-plugin-strategy-starter-hystrix包，否则线程切换时会发生ThreadLocal上下文对象丢失
+# spring.application.strategy.hystrix.threadlocal.supported=true
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