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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.meta;

import alluxio.wire.Address;

import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.concurrent.NotThreadSafe;

/**
 * Master information.
 */
@NotThreadSafe
public final class MasterInfo {
  private static final Logger LOG = LoggerFactory.getLogger(MasterInfo.class);

  /** Master's address. */
  private final Address mAddress;
  /** The id of the master. */
  private final long mId;
  /** Master's last updated time in ms. */
  private long mLastUpdatedTimeMs;

  /**
   * Creates a new instance of {@link MasterInfo}.
   *
   * @param id the master id to use
   * @param address the master address to use
   */
  public MasterInfo(long id, Address address) {
    mAddress = Preconditions.checkNotNull(address, "address");
    mId = id;
    mLastUpdatedTimeMs = System.currentTimeMillis();
  }

  /**
   * @return the master's address
   */
  public Address getAddress() {
    return mAddress;
  }

  /**
   * @return the id of the master
   */
  public long getId() {
    return mId;
  }

  /**
   * @return the last updated time of the master in ms
   */
  public long getLastUpdatedTimeMs() {
    return mLastUpdatedTimeMs;
  }

  @Override
  public String toString() {
    return MoreObjects.toStringHelper(this).add("id", mId).add("address", mAddress)
        .add("lastUpdatedTimeMs", mLastUpdatedTimeMs).toString();
  }

  /**
   * Updates the last updated time of the master in ms.
   */
  public void updateLastUpdatedTimeMs() {
    mLastUpdatedTimeMs = System.currentTimeMillis();
  }
}