content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.master.selectionpolicy;
  
  import alluxio.exception.status.UnavailableException;
  import alluxio.master.MasterInquireClient;
  
  import java.net.InetSocketAddress;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * The master selection policy that connects to a random master.
   */
  public class SelectionPolicyAnyMaster extends AbstractMasterSelectionPolicy {
    protected SelectionPolicyAnyMaster() {}
  
    @Override
    public synchronized InetSocketAddress getGrpcMasterAddress(
        MasterInquireClient masterInquireClient) throws UnavailableException {
      List<InetSocketAddress> masterAddresses =
          new ArrayList<>(masterInquireClient.getMasterRpcAddresses());
      if (masterAddresses.size() == 0) {
        throw new UnavailableException("No master available");
      }
      Collections.shuffle(masterAddresses);
      return masterAddresses.get(0);
    }
  
    @Override
    public Type getType() {
      return Type.ANY_MASTER;
    }
  }
  