feature:check the required fields etcd when the Config mode starts(#1439) (#1440)

kernel/dynamic/api/src/main/java/cn/hippo4j/threadpool/dynamic/api/BootstrapPropertiesInterface.java

@@ -79,4 +79,11 @@ public interface BootstrapPropertiesInterface {
     default Map<String, String> getNacos() {
         return null;
     }
+
+    /**
+     * Get etcd.
+     */
+    default Map<String, String> getEtcd() {
+        return null;
+    }
 }

threadpool/core/src/main/java/cn/hippo4j/core/enable/BeforeCheckConfiguration.java

@@ -91,6 +91,21 @@ public class BeforeCheckConfiguration {
                                     "Please check whether the [spring.dynamic.thread-pool.nacos.data-id] configuration is empty or an empty string.");
                         }
                     }
+                    Map<String, String> etcd = properties.getEtcd();
+                    if (MapUtil.isNotEmpty(etcd)){
+                        String endpoints = etcd.get("endpoints");
+                        if ((StringUtil.isBlank(endpoints))){
+                            throw new ConfigEmptyException(
+                                    "Web server failed to start. The dynamic thread pool etcd endpoints is empty.",
+                                    "Please check whether the [spring.dynamic.thread-pool.etcd.endpoints] configuration is empty or an empty string.");
+                        }
+                        String key = etcd.get("key");
+                        if ((StringUtil.isBlank(key))){
+                            throw new ConfigEmptyException(
+                                    "Web server failed to start. The dynamic thread pool etcd key is empty.",
+                                    "Please check whether the [spring.dynamic.thread-pool.etcd.key] configuration is empty or an empty string.");
+                        }
+                    }
                     break;
                 }
                 default: