| /* |
| * 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; |
| |
| import org.apache.dubbo.common.URL; |
| import org.apache.dubbo.common.lang.Prioritized; |
| import org.apache.dubbo.metadata.MetadataInfo; |
| import org.apache.dubbo.registry.RegistryService; |
| import org.apache.dubbo.registry.client.event.listener.ServiceInstancesChangedListener; |
| |
| import java.util.List; |
| import java.util.Set; |
| |
| import static org.apache.dubbo.common.constants.CommonConstants.REGISTRY_DELAY_NOTIFICATION_KEY; |
| |
| /** |
| * Defines the common operations of Service Discovery, extended and loaded by ServiceDiscoveryFactory |
| */ |
| public interface ServiceDiscovery extends RegistryService, Prioritized { |
| |
| void register() throws RuntimeException; |
| |
| void update() throws RuntimeException; |
| |
| void unregister() throws RuntimeException; |
| |
| /** |
| * Gets all service names |
| * |
| * @return non-null read-only {@link Set} |
| */ |
| Set<String> getServices(); |
| |
| List<ServiceInstance> getInstances(String serviceName) throws NullPointerException; |
| |
| default void addServiceInstancesChangedListener(ServiceInstancesChangedListener listener) |
| throws NullPointerException, IllegalArgumentException { |
| } |
| |
| /** |
| * unsubscribe to instance change event. |
| * |
| * @param listener |
| * @throws IllegalArgumentException |
| */ |
| default void removeServiceInstancesChangedListener(ServiceInstancesChangedListener listener) |
| throws IllegalArgumentException { |
| } |
| |
| default ServiceInstancesChangedListener createListener(Set<String> serviceNames) { |
| return new ServiceInstancesChangedListener(serviceNames, this); |
| } |
| |
| ServiceInstance getLocalInstance(); |
| |
| MetadataInfo getLocalMetadata(); |
| |
| MetadataInfo getRemoteMetadata(String revision); |
| |
| MetadataInfo getRemoteMetadata(String revision, List<ServiceInstance> instances); |
| |
| /** |
| * Destroy the {@link ServiceDiscovery} |
| * |
| * @throws Exception If met with error |
| */ |
| void destroy() throws Exception; |
| |
| boolean isDestroy(); |
| |
| default URL getUrl() { |
| return null; |
| } |
| |
| default long getDelay() { |
| return getUrl().getParameter(REGISTRY_DELAY_NOTIFICATION_KEY, 5000); |
| } |
| |
| /** |
| * A human-readable description of the implementation |
| * |
| * @return The description. |
| */ |
| |
| @Override |
| String toString(); |
| } |