项目初始化

datax-modules/workflow-service-parent/workflow-service-api/src/main/java/cn/datax/service/workflow/api/feign/FlowInstanceServiceFeign.java

+package cn.datax.service.workflow.api.feign;
+
+import cn.datax.service.workflow.api.dto.ProcessInstanceCreateRequest;
+import cn.datax.service.workflow.api.feign.factory.FlowInstanceServiceFeignFallbackFactory;
+import cn.datax.service.workflow.api.vo.FlowInstanceVo;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+
+@FeignClient(contextId = "flowInstanceServiceFeign", value = "datax-service-workflow", fallbackFactory = FlowInstanceServiceFeignFallbackFactory.class)
+public interface FlowInstanceServiceFeign {
+
+    @PostMapping("/instances/startById")
+    FlowInstanceVo startById(@RequestBody ProcessInstanceCreateRequest request);
+}

datax-modules/workflow-service-parent/workflow-service-api/src/main/java/cn/datax/service/workflow/api/feign/factory/FlowInstanceServiceFeignFallbackFactory.java

+package cn.datax.service.workflow.api.feign.factory;
+
+import cn.datax.service.workflow.api.feign.FlowInstanceServiceFeign;
+import cn.datax.service.workflow.api.feign.fallback.FlowInstanceServiceFeignFallbackImpl;
+import feign.hystrix.FallbackFactory;
+import org.springframework.stereotype.Component;
+
+@Component
+public class FlowInstanceServiceFeignFallbackFactory implements FallbackFactory<FlowInstanceServiceFeign> {
+
+    @Override
+    public FlowInstanceServiceFeign create(Throwable throwable) {
+        FlowInstanceServiceFeignFallbackImpl flowInstanceServiceFeignFallback = new FlowInstanceServiceFeignFallbackImpl();
+        flowInstanceServiceFeignFallback.setCause(throwable);
+        return flowInstanceServiceFeignFallback;
+    }
+}

datax-modules/workflow-service-parent/workflow-service-api/src/main/java/cn/datax/service/workflow/api/feign/fallback/FlowInstanceServiceFeignFallbackImpl.java

+package cn.datax.service.workflow.api.feign.fallback;
+
+import cn.datax.service.workflow.api.dto.ProcessInstanceCreateRequest;
+import cn.datax.service.workflow.api.feign.FlowInstanceServiceFeign;
+import cn.datax.service.workflow.api.vo.FlowInstanceVo;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+@Slf4j
+@Component
+public class FlowInstanceServiceFeignFallbackImpl implements FlowInstanceServiceFeign {
+
+    @Setter
+    private Throwable cause;
+
+    @Override
+    public FlowInstanceVo startById(ProcessInstanceCreateRequest request) {
+        log.error("feign 调用{}出错", request, cause);
+        return null;
+    }
+}

datax-modules/workflow-service-parent/workflow-service-api/src/main/resources/META-INF/spring.factories

-org.springframework.boot.autoconfigure.EnableAutoConfiguration=
+org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
+  cn.datax.service.workflow.api.feign.factory.FlowInstanceServiceFeignFallbackFactory,\
+  cn.datax.service.workflow.api.feign.fallback.FlowInstanceServiceFeignFallbackImpl