Add the priority to AbilityControlManager.

client/src/main/java/com/alibaba/nacos/client/ability/ClientAbilityControlManager.java

@@ -63,5 +63,11 @@ public class ClientAbilityControlManager extends DefaultAbilityControlManager {
     protected void remove(String connectionId) {
         // nothing to do
     }
-
+    
+    @Override
+    public int getPriority() {
+        // if server ability manager exist, you should choose the server one
+        return 0;
+    }
+    
 }

client/src/main/resources/META-INF/services/com.alibaba.nacos.common.ability.DefaultAbilityControlManager

@@ -0,0 +1,18 @@
+#
+#  Copyright 1999-2022 Alibaba Group Holding Ltd.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+#
+
+com.alibaba.nacos.client.ability.ClientAbilityControlManager

common/pom.xml

@@ -84,7 +84,6 @@
                 <filtering>true</filtering>
                 <includes>
                     <include>nacos-version.txt</include>
-                    <include>META-INF/services/com.alibaba.nacos.common.ability.DefaultAbilityControlManager</include>
                 </includes>
             </resource>
         </resources>

common/src/main/java/com/alibaba/nacos/common/ability/AbstractAbilityControlManager.java

@@ -208,6 +208,14 @@ public abstract class AbstractAbilityControlManager implements AbilityControlMan
         // default destroy
         // nothing to do
     }
+    
+    /**
+     * A Nacos application can only have one {@link AbilityControlManager}.
+     * When multiple control centers exist, it is used to determine which one is preferred
+     *
+     * @return priority
+     */
+    public abstract int getPriority();
 
     /**
      * Return ability table of current node

common/src/main/java/com/alibaba/nacos/common/ability/discover/NacosAbilityManagerHolder.java

@@ -24,7 +24,10 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.Collection;
+import java.util.Comparator;
+import java.util.List;
 import java.util.ServiceConfigurationError;
+import java.util.stream.Collectors;
 
 /**
  * This class is used to discover {@link AbstractAbilityControlManager} implements. All the
@@ -55,14 +58,15 @@ public class NacosAbilityManagerHolder {
             // if server
             load = NacosServiceLoader.load(DefaultAbilityControlManager.class);
         } catch (ServiceConfigurationError e) {
-            // if client or not ability control manager
+            throw new RuntimeException("[AbilityControlManager] Cannot find AbilityControlManger");
-            load = NacosServiceLoader.load(DefaultAbilityControlManager.class);
         }
         // the priority of the server is higher
+        List<DefaultAbilityControlManager> collect = load.stream()
+                .sorted(Comparator.comparingInt(AbstractAbilityControlManager::getPriority))
+                .collect(Collectors.toList());
+        // get the highest priority one
         if (load.size() > 0) {
-            load.forEach(clazz -> {
+            abstractAbilityControlManager = collect.get(collect.size() - 1);
-                abstractAbilityControlManager = clazz;
-            });
             LOGGER.info("[AbilityControlManager] Successfully initialize AbilityControlManager");
         }
     }

core/src/main/java/com/alibaba/nacos/core/ability/control/ServerAbilityControlManager.java

@@ -181,6 +181,11 @@ public class ServerAbilityControlManager extends DefaultAbilityControlManager im
         }
     }
     
+    @Override
+    public int getPriority() {
+        return 1;
+    }
+    
     /**.
      * notify when current node ability changing
      */

core/src/main/resources/META-INF/services/com.alibaba.nacos.common.ability.DefaultAbilityControlManager

@@ -15,5 +15,4 @@
 #
 #
 
-com.alibaba.nacos.client.ability.ClientAbilityControlManager
 com.alibaba.nacos.core.ability.control.ServerAbilityControlManager