service-registry/registry-zero-config/src/main/java/org/apache/servicecomb/zeroconfig/ZeroConfigDiscovery.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.servicecomb.zeroconfig;

import static org.apache.servicecomb.zeroconfig.ZeroConfigConst.ORDER;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

import org.apache.servicecomb.registry.lightweight.AbstractLightweightDiscovery;
import org.apache.servicecomb.registry.lightweight.model.Microservice;
import org.apache.servicecomb.registry.lightweight.model.MicroserviceInstance;
import org.apache.servicecomb.registry.lightweight.model.MicroserviceInstances;
import org.springframework.beans.factory.annotation.Autowired;

public class ZeroConfigDiscovery extends AbstractLightweightDiscovery<ZeroConfigDiscoveryInstance> {
  private Config config;

  @Autowired
  public ZeroConfigDiscovery setConfig(Config config) {
    this.config = config;
    return this;
  }

  @Override
  public String name() {
    return ZeroConfigConst.ZERO_CONFIG_REGISTRY_NAME;
  }

  @Override
  public void setInstanceChangedListener(InstanceChangedListener<ZeroConfigDiscoveryInstance> instanceChangedListener) {

  }

  @Override
  public int getOrder() {
    return ORDER;
  }

  @Override
  public boolean enabled() {
    return config.isEnabled();
  }

  @Override
  public void run() {

  }

  @Override
  public List<ZeroConfigDiscoveryInstance> findServiceInstances(String application, String serviceName) {
    MicroserviceInstances microserviceInstances =
        store.findServiceInstances(application, serviceName, "0");
    if (microserviceInstances.isMicroserviceNotExist() || microserviceInstances.getInstancesResponse() == null) {
      return Collections.emptyList();
    }
    List<ZeroConfigDiscoveryInstance> result = new ArrayList<>();
    for (MicroserviceInstance instance : microserviceInstances.getInstancesResponse().getInstances()) {
      result.add(new ZeroConfigDiscoveryInstance(store.getMicroservice(instance.getServiceId()).get(), instance));
    }
    return result;
  }

  @Override
  public List<String> findServices(String application) {
    List<Microservice> microservices = store.getAllMicroservices();
    return microservices.stream().filter(e -> e.getAppId().equals(application))
        .map(Microservice::getServiceName).collect(Collectors.toList());
  }
}