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.wire;
  
  import alluxio.util.CommonUtils;
  
  import com.google.common.base.MoreObjects;
  
  import java.time.Instant;
  import java.time.format.DateTimeFormatter;
  import java.time.temporal.ChronoUnit;
  
  /**
   * A RegisterLease is what the master uses to control the concurrency of worker registration.
   * The worker must be granted a lease before it can start the registration.
   * Each lease will have an expiry timestamp. One lease is released when a worker finishes
   * registration, or the lease expires.
   * The lease is only checked on registration. It is not for worker authentication.
   */
  public class RegisterLease {
    public long mExpiryTimeMs;
  
    /**
     * Constructor.
     *
     * @param ttlMs TTL
     */
    public RegisterLease(long ttlMs) {
      mExpiryTimeMs = CommonUtils.getCurrentMs() + ttlMs;
    }
  
    @Override
    public String toString() {
      Instant expiry = Instant.ofEpochMilli(mExpiryTimeMs);
      return MoreObjects.toStringHelper(this)
          .add("Expiry",
              DateTimeFormatter.ISO_INSTANT.format(expiry.truncatedTo(ChronoUnit.SECONDS)))
          .toString();
    }
  }
  