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/*
* 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.xds;
import java.util.Collection;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.logger.ErrorTypeAwareLogger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.registry.client.DefaultServiceInstance;
import org.apache.dubbo.registry.client.ReflectionBasedServiceDiscovery;
import org.apache.dubbo.registry.client.ServiceInstance;
import org.apache.dubbo.registry.client.event.listener.ServiceInstancesChangedListener;
import org.apache.dubbo.registry.xds.util.PilotExchanger;
import org.apache.dubbo.registry.xds.util.protocol.message.Endpoint;
import org.apache.dubbo.rpc.model.ApplicationModel;
import org.apache.dubbo.rpc.model.ScopeModelUtil;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_ERROR_INITIALIZE_XDS;
import static org.apache.dubbo.common.constants.LoggerCodeConstants.REGISTRY_ERROR_PARSING_XDS;
public class XdsServiceDiscovery extends ReflectionBasedServiceDiscovery {
private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(XdsServiceDiscovery.class);
private PilotExchanger exchanger;
public XdsServiceDiscovery(ApplicationModel applicationModel, URL registryURL) {
super(applicationModel, registryURL);
}
@Override
public void doInitialize(URL registryURL) {
try {
exchanger = PilotExchanger.initialize(registryURL);
} catch (Throwable t) {
logger.error(REGISTRY_ERROR_INITIALIZE_XDS, "", "", t.getMessage(), t);
}
}
@Override
public void doDestroy() {
try {
exchanger.destroy();
} catch (Throwable t) {
logger.error(REGISTRY_ERROR_INITIALIZE_XDS, "", "", t.getMessage(), t);
}
}
@Override
public Set getServices() {
return exchanger.getServices();
}
@Override
public List getInstances(String serviceName) throws NullPointerException {
Set endpoints = exchanger.getEndpoints(serviceName);
return changedToInstances(serviceName, endpoints);
}
@Override
public void addServiceInstancesChangedListener(ServiceInstancesChangedListener listener) throws NullPointerException, IllegalArgumentException {
listener.getServiceNames().forEach(serviceName -> exchanger.observeEndpoints(serviceName,
(endpoints -> notifyListener(serviceName, listener, changedToInstances(serviceName, endpoints)))));
}
private List changedToInstances(String serviceName, Collection endpoints) {
List instances = new LinkedList<>();
endpoints.forEach(endpoint -> {
try {
DefaultServiceInstance serviceInstance = new DefaultServiceInstance(serviceName, endpoint.getAddress(), endpoint.getPortValue(), ScopeModelUtil.getApplicationModel(getUrl().getScopeModel()));
// fill metadata by SelfHostMetaServiceDiscovery, will be fetched by RPC request
serviceInstance.putExtendParam("clusterName", endpoint.getClusterName());
fillServiceInstance(serviceInstance);
instances.add(serviceInstance);
} catch (Throwable t) {
logger.error(REGISTRY_ERROR_PARSING_XDS, "", "", "Error occurred when parsing endpoints. Endpoints List:" + endpoints, t);
}
});
instances.sort(Comparator.comparingInt(ServiceInstance::hashCode));
return instances;
}
}