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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.client.metadata;
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.utils.CollectionUtils;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.metadata.MetadataService;
import org.apache.dubbo.metadata.WritableMetadataService;
import org.apache.dubbo.registry.client.ServiceDiscovery;
import org.apache.dubbo.registry.client.ServiceInstance;
import org.apache.dubbo.registry.client.metadata.store.RemoteMetadataServiceImpl;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Protocol;
import org.apache.dubbo.rpc.ProxyFactory;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import static org.apache.dubbo.registry.client.metadata.ServiceInstanceMetadataUtils.METADATA_SERVICE_URLS_PROPERTY_NAME;
public class MetadataUtils {
private static final Object REMOTE_LOCK = new Object();
public static ConcurrentMap metadataServiceProxies = new ConcurrentHashMap<>();
private static final ProxyFactory proxyFactory = ExtensionLoader.getExtensionLoader(ProxyFactory.class).getAdaptiveExtension();
private static final Protocol protocol = ExtensionLoader.getExtensionLoader(Protocol.class).getAdaptiveExtension();
public static RemoteMetadataServiceImpl remoteMetadataService;
public static RemoteMetadataServiceImpl getRemoteMetadataService() {
if (remoteMetadataService == null) {
synchronized (REMOTE_LOCK) {
if (remoteMetadataService == null) {
remoteMetadataService = new RemoteMetadataServiceImpl(WritableMetadataService.getDefaultExtension());
}
}
}
return remoteMetadataService;
}
public static void publishServiceDefinition(URL url) {
// store in local
WritableMetadataService.getDefaultExtension().publishServiceDefinition(url);
// send to remote
// if (REMOTE_METADATA_STORAGE_TYPE.equals(url.getParameter(METADATA_KEY))) {
getRemoteMetadataService().publishServiceDefinition(url);
// }
}
public static MetadataService getMetadataServiceProxy(ServiceInstance instance, ServiceDiscovery serviceDiscovery) {
String key = instance.getServiceName() + "##" +
ServiceInstanceMetadataUtils.getExportedServicesRevision(instance);
return metadataServiceProxies.computeIfAbsent(key, k -> {
MetadataServiceURLBuilder builder = null;
ExtensionLoader loader
= ExtensionLoader.getExtensionLoader(MetadataServiceURLBuilder.class);
Map metadata = instance.getMetadata();
// METADATA_SERVICE_URLS_PROPERTY_NAME is a unique key exists only on instances of spring-cloud-alibaba.
String dubboURLsJSON = metadata.get(METADATA_SERVICE_URLS_PROPERTY_NAME);
if (StringUtils.isNotEmpty(dubboURLsJSON)) {
builder = loader.getExtension(SpringCloudMetadataServiceURLBuilder.NAME);
} else {
builder = loader.getExtension(StandardMetadataServiceURLBuilder.NAME);
}
List urls = builder.build(instance);
if (CollectionUtils.isEmpty(urls)) {
throw new IllegalStateException("You have enabled introspection service discovery mode for instance "
+ instance + ", but no metadata service can build from it.");
}
// Simply rely on the first metadata url, as stated in MetadataServiceURLBuilder.
Invoker invoker = protocol.refer(MetadataService.class, urls.get(0));
return proxyFactory.getProxy(invoker);
});
}
}