/**
 * 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.hadoop.hdfs.server.federation.store.protocol;

import java.io.IOException;
import java.util.List;

import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreSerializer;
import org.apache.hadoop.hdfs.server.federation.store.records.MembershipState;

/**
 * API response for listing namenode registrations present in the state store.
 */
public abstract class GetNamenodeRegistrationsResponse {

  public static GetNamenodeRegistrationsResponse newInstance()
      throws IOException {
    return StateStoreSerializer.newRecord(
        GetNamenodeRegistrationsResponse.class);
  }

  public static GetNamenodeRegistrationsResponse newInstance(
      List<MembershipState> records) throws IOException {
    GetNamenodeRegistrationsResponse response = newInstance();
    response.setNamenodeMemberships(records);
    return response;
  }

  @Public
  @Unstable
  public abstract List<MembershipState> getNamenodeMemberships()
      throws IOException;

  @Public
  @Unstable
  public abstract void setNamenodeMemberships(
      List<MembershipState> records) throws IOException;
}