org.apache.dubbo.registry.nacos.NacosServiceDiscovery Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of dubbo Show documentation
Show all versions of dubbo Show documentation
The all in one project of dubbo
/*
* 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.listener.NamingEvent;
import com.alibaba.nacos.api.naming.pojo.Instance;
import com.alibaba.nacos.api.naming.pojo.ListView;
import com.alibaba.nacos.api.naming.utils.NamingUtils;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
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 NacosNamingServiceWrapper 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 doRegister(ServiceInstance serviceInstance) {
execute(namingService, service -> {
Instance instance = toInstance(serviceInstance);
appendPreservedParam(instance);
service.registerInstance(instance.getServiceName(), group, instance);
});
}
@Override
public void doUpdate(ServiceInstance serviceInstance) {
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 getServices() {
return ThrowableFunction.execute(namingService, service -> {
ListView view = service.getServicesOfServer(0, Integer.MAX_VALUE, group);
return new LinkedHashSet<>(view.getData());
});
}
@Override
public List 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 = NamingUtils.getServiceName(event.getServiceName());
List serviceInstances = event.getInstances()
.stream()
.map(NacosNamingServiceUtils::toServiceInstance)
.collect(Collectors.toList());
dispatchServiceInstancesChangedEvent(serviceName, serviceInstances);
}
private void appendPreservedParam(Instance instance) {
Map preservedParam = NacosNamingServiceUtils.getNacosPreservedParam(getUrl());
instance.getMetadata().putAll(preservedParam);
}
}