caqhy commented on code in PR #20984: URL: https://github.com/apache/shardingsphere/pull/20984#discussion_r976358743
########## shardingsphere-mode/shardingsphere-mode-type/shardingsphere-cluster-mode/shardingsphere-cluster-mode-repository/shardingsphere-cluster-mode-repository-provider/shardingsphere-cluster-mode-repository-nacos/src/main/java/org/apache/shardingsphere/mode/repository/cluster/nacos/listener/NamingEventListener.java: ########## @@ -0,0 +1,129 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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. + */ + +package org.apache.shardingsphere.mode.repository.cluster.nacos.listener; + +import com.alibaba.nacos.api.naming.listener.Event; +import com.alibaba.nacos.api.naming.listener.EventListener; +import com.alibaba.nacos.api.naming.listener.NamingEvent; +import com.alibaba.nacos.api.naming.pojo.Instance; +import lombok.RequiredArgsConstructor; +import org.apache.shardingsphere.mode.repository.cluster.listener.DataChangedEvent; +import org.apache.shardingsphere.mode.repository.cluster.listener.DataChangedEventListener; +import org.apache.shardingsphere.mode.repository.cluster.nacos.utils.MetadataUtil; + +import java.util.Comparator; +import java.util.HashMap; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.function.Function; +import java.util.stream.Collectors; + +/** + * Naming event listener. + */ +@RequiredArgsConstructor +public class NamingEventListener implements EventListener { Review Comment: OK ########## shardingsphere-mode/shardingsphere-mode-type/shardingsphere-cluster-mode/shardingsphere-cluster-mode-repository/shardingsphere-cluster-mode-repository-provider/shardingsphere-cluster-mode-repository-nacos/src/main/java/org/apache/shardingsphere/mode/repository/cluster/nacos/listener/NamingEventListener.java: ########## @@ -0,0 +1,129 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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. + */ + +package org.apache.shardingsphere.mode.repository.cluster.nacos.listener; + +import com.alibaba.nacos.api.naming.listener.Event; +import com.alibaba.nacos.api.naming.listener.EventListener; +import com.alibaba.nacos.api.naming.listener.NamingEvent; +import com.alibaba.nacos.api.naming.pojo.Instance; +import lombok.RequiredArgsConstructor; +import org.apache.shardingsphere.mode.repository.cluster.listener.DataChangedEvent; +import org.apache.shardingsphere.mode.repository.cluster.listener.DataChangedEventListener; +import org.apache.shardingsphere.mode.repository.cluster.nacos.utils.MetadataUtil; + +import java.util.Comparator; +import java.util.HashMap; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.function.Function; +import java.util.stream.Collectors; + +/** + * Naming event listener. + */ +@RequiredArgsConstructor +public class NamingEventListener implements EventListener { + + private Map<String, Instance> preInstances = new HashMap<>(); + + private final Map<String, DataChangedEventListener> prefixListenerMap; + + @Override + public void onEvent(final Event event) { + if (event instanceof NamingEvent) { + NamingEvent namingEvent = (NamingEvent) event; + List<Instance> instances = namingEvent.getInstances().stream().sorted(Comparator.comparing(MetadataUtil::getKey)).collect(Collectors.toList()); + List<WatchData> watchDataList = new LinkedList<>(); + instances.forEach(instance -> prefixListenerMap.forEach((prefixPath, listener) -> { + String key = MetadataUtil.getKey(instance); + if (key.startsWith(prefixPath)) { + Instance preInstance = preInstances.remove(key); + WatchData watchData = new WatchData(key, preInstance, instance, listener); + watchDataList.add(watchData); + } + })); + preInstances.values().stream().sorted(Comparator.comparing(MetadataUtil::getKey).reversed()).forEach(instance -> prefixListenerMap.forEach((prefixPath, listener) -> { + String key = MetadataUtil.getKey(instance); + if (key.startsWith(prefixPath)) { + WatchData watchData = new WatchData(key, instance, null, listener); + watchDataList.add(watchData); + } + })); + watchDataList.forEach(watchData -> { + String key = watchData.getKey(); + Instance preInstance = watchData.getPreInstance(); + Instance instance = watchData.getInstance(); + DataChangedEventListener listener = watchData.getListener(); + DataChangedEvent.Type changedType = getEventChangedType(preInstance, instance); + switch (changedType) { + case ADDED: + case UPDATED: + listener.onChange(new DataChangedEvent(key, MetadataUtil.getValue(instance), changedType)); + break; + case DELETED: + listener.onChange(new DataChangedEvent(key, MetadataUtil.getValue(preInstance), changedType)); + break; + default: + } + }); + setPreInstances(instances); + } + } + + private DataChangedEvent.Type getEventChangedType(final Instance preInstance, final Instance instance) { + DataChangedEvent.Type type; + if (Objects.isNull(preInstance) && Objects.nonNull(instance)) { + type = DataChangedEvent.Type.ADDED; + } else if (Objects.nonNull(preInstance) && Objects.nonNull(instance) + && MetadataUtil.getTimestamp(preInstance) != MetadataUtil.getTimestamp(instance)) { + type = DataChangedEvent.Type.UPDATED; + } else if (Objects.nonNull(preInstance) && Objects.isNull(instance)) { + type = DataChangedEvent.Type.DELETED; + } else { + return DataChangedEvent.Type.IGNORED; + } + return type; Review Comment: OK -- This is an automated message from the Apache Git Service. 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