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Common utilities shared in Alluxio core modules

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/*
 * 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;

import alluxio.uri.Authority;
import alluxio.uri.SingleMasterAuthority;

import java.net.InetSocketAddress;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

/**
 * A {@link MasterInquireClient} which always returns a fixed master address.
 */
public class SingleMasterInquireClient implements MasterInquireClient {
  private final SingleMasterConnectDetails mConnectDetails;

  /**
   * @param address the master address
   */
  public SingleMasterInquireClient(InetSocketAddress address) {
    mConnectDetails = new SingleMasterConnectDetails(address);
  }

  @Override
  public InetSocketAddress getPrimaryRpcAddress() {
    return mConnectDetails.getAddress();
  }

  @Override
  public List getMasterRpcAddresses() {
    return Collections.singletonList(mConnectDetails.getAddress());
  }

  @Override
  public ConnectDetails getConnectDetails() {
    return mConnectDetails;
  }

  /**
   * Connect details for a single master inquire client.
   */
  public static class SingleMasterConnectDetails implements ConnectDetails {
    private final InetSocketAddress mAddress;

    /**
     * @param address an address
     */
    public SingleMasterConnectDetails(InetSocketAddress address) {
      mAddress = address;
    }

    /**
     * @return the address
     */
    public InetSocketAddress getAddress() {
      return mAddress;
    }

    @Override
    public Authority toAuthority() {
      return new SingleMasterAuthority(mAddress.getHostString(), mAddress.getPort());
    }

    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (!(o instanceof SingleMasterConnectDetails)) {
        return false;
      }
      SingleMasterConnectDetails that = (SingleMasterConnectDetails) o;
      return mAddress.equals(that.mAddress);
    }

    @Override
    public int hashCode() {
      return Objects.hash(mAddress);
    }

    @Override
    public String toString() {
      return toAuthority().toString();
    }
  }
}