| /* |
| * 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.dubbo.registry.nacos; |
| |
| import org.apache.dubbo.common.URL; |
| import org.apache.dubbo.common.function.ThrowableFunction; |
| import org.apache.dubbo.common.logger.Logger; |
| import org.apache.dubbo.common.logger.LoggerFactory; |
| import org.apache.dubbo.registry.client.AbstractServiceDiscovery; |
| import org.apache.dubbo.registry.client.ServiceDiscovery; |
| import org.apache.dubbo.registry.client.ServiceInstance; |
| import org.apache.dubbo.registry.client.event.listener.ServiceInstancesChangedListener; |
| import org.apache.dubbo.registry.nacos.util.NacosNamingServiceUtils; |
| |
| import com.alibaba.nacos.api.exception.NacosException; |
| import com.alibaba.nacos.api.naming.NamingService; |
| import com.alibaba.nacos.api.naming.listener.NamingEvent; |
| import com.alibaba.nacos.api.naming.pojo.Instance; |
| import com.alibaba.nacos.api.naming.pojo.ListView; |
| |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Collectors; |
| |
| import static org.apache.dubbo.common.function.ThrowableConsumer.execute; |
| import static org.apache.dubbo.registry.nacos.util.NacosNamingServiceUtils.createNamingService; |
| import static org.apache.dubbo.registry.nacos.util.NacosNamingServiceUtils.getGroup; |
| import static org.apache.dubbo.registry.nacos.util.NacosNamingServiceUtils.toInstance; |
| |
| /** |
| * Nacos {@link ServiceDiscovery} implementation |
| * |
| * @see ServiceDiscovery |
| * @since 2.7.5 |
| */ |
| public class NacosServiceDiscovery extends AbstractServiceDiscovery { |
| |
| private final Logger logger = LoggerFactory.getLogger(getClass()); |
| |
| private String group; |
| |
| private NamingService namingService; |
| |
| private URL registryURL; |
| |
| @Override |
| public void initialize(URL registryURL) throws Exception { |
| this.namingService = createNamingService(registryURL); |
| this.group = getGroup(registryURL); |
| this.registryURL = registryURL; |
| } |
| |
| @Override |
| public void destroy() { |
| this.namingService = null; |
| } |
| |
| @Override |
| public void register(ServiceInstance serviceInstance) throws RuntimeException { |
| super.register(serviceInstance); |
| execute(namingService, service -> { |
| Instance instance = toInstance(serviceInstance); |
| service.registerInstance(instance.getServiceName(), group, instance); |
| }); |
| } |
| |
| @Override |
| public void update(ServiceInstance serviceInstance) throws RuntimeException { |
| // TODO: Nacos should support |
| if (this.serviceInstance == null) { |
| register(serviceInstance); |
| } else { |
| unregister(serviceInstance); |
| register(serviceInstance); |
| } |
| } |
| |
| @Override |
| public void unregister(ServiceInstance serviceInstance) throws RuntimeException { |
| execute(namingService, service -> { |
| Instance instance = toInstance(serviceInstance); |
| service.deregisterInstance(instance.getServiceName(), group, instance); |
| }); |
| } |
| |
| @Override |
| public Set<String> getServices() { |
| return ThrowableFunction.execute(namingService, service -> { |
| ListView<String> view = service.getServicesOfServer(0, Integer.MAX_VALUE, group); |
| return new LinkedHashSet<>(view.getData()); |
| }); |
| } |
| |
| @Override |
| public List<ServiceInstance> getInstances(String serviceName) throws NullPointerException { |
| return ThrowableFunction.execute(namingService, service -> |
| service.selectInstances(serviceName, true) |
| .stream().map(NacosNamingServiceUtils::toServiceInstance) |
| .collect(Collectors.toList()) |
| ); |
| } |
| |
| @Override |
| public void addServiceInstancesChangedListener(ServiceInstancesChangedListener listener) |
| throws NullPointerException, IllegalArgumentException { |
| execute(namingService, service -> { |
| listener.getServiceNames().forEach(serviceName -> { |
| try { |
| service.subscribe(serviceName, e -> { // Register Nacos EventListener |
| if (e instanceof NamingEvent) { |
| NamingEvent event = (NamingEvent) e; |
| handleEvent(event, listener); |
| } |
| }); |
| } catch (NacosException e) { |
| e.printStackTrace(); |
| } |
| }); |
| }); |
| } |
| |
| @Override |
| public URL getUrl() { |
| return registryURL; |
| } |
| |
| private void handleEvent(NamingEvent event, ServiceInstancesChangedListener listener) { |
| String serviceName = event.getServiceName(); |
| List<ServiceInstance> serviceInstances = event.getInstances() |
| .stream() |
| .map(NacosNamingServiceUtils::toServiceInstance) |
| .collect(Collectors.toList()); |
| dispatchServiceInstancesChangedEvent(serviceName, serviceInstances); |
| } |
| } |