dubbo-samples-spi-compatible/src/main/java/org/apache/dubbo/samples/basic/spi/CompatibleServiceDiscovery.java

/*
 * 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.samples.basic.spi;

import org.apache.dubbo.common.URL;
import org.apache.dubbo.registry.client.AbstractServiceDiscovery;
import org.apache.dubbo.registry.client.ServiceInstance;
import org.apache.dubbo.rpc.model.ApplicationModel;

import java.util.Collections;
import java.util.List;
import java.util.Set;

public class CompatibleServiceDiscovery extends AbstractServiceDiscovery {

    private ServiceInstance serviceInstance;
    private URL url;

    public CompatibleServiceDiscovery(ApplicationModel applicationModel, URL registryURL) {
        super(applicationModel, registryURL);
        this.url = registryURL;
    }

    @Override
    protected void doRegister(ServiceInstance serviceInstance) throws RuntimeException {
        this.serviceInstance = serviceInstance;
    }

    @Override
    protected void doUnregister(ServiceInstance serviceInstance) {
        this.serviceInstance = null;
    }

    @Override
    protected void doDestroy() throws Exception {

    }

    @Override
    public Set<String> getServices() {
        return Collections.emptySet();
    }

    @Override
    public List<ServiceInstance> getInstances(String serviceName) throws NullPointerException {
        return Collections.emptyList();
    }
}