content: /*
   * 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.cassandra.repair.state;
  
  import java.util.Objects;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.cassandra.utils.Clock;
  
  public interface Completable<I>
  {
      I getId();
  
      long getInitializedAtMillis();
  
      long getInitializedAtNanos();
  
      long getLastUpdatedAtMillis();
  
      long getLastUpdatedAtNanos();
  
      default long getDurationMillis()
      {
          long endNanos = getLastUpdatedAtNanos();
          if (!isComplete())
              endNanos = Clock.Global.nanoTime();
          return TimeUnit.NANOSECONDS.toMillis(endNanos - getInitializedAtNanos());
      }
  
      Result getResult();
  
      default boolean isComplete()
      {
          return getResult() != null;
      }
  
      default String getFailureCause()
      {
          Result r = getResult();
          if (r == null || r.kind == Result.Kind.SUCCESS)
              return null;
          return r.message;
      }
  
      default String getSuccessMessage()
      {
          Result r = getResult();
          if (r == null || r.kind != Result.Kind.SUCCESS)
              return null;
          return r.message;
      }
  
      class Result
      {
          public enum Kind
          {SUCCESS, SKIPPED, FAILURE}
  
          public final Result.Kind kind;
          public final String message;
  
          private Result(Result.Kind kind, String message)
          {
              this.kind = kind;
              this.message = message;
          }
  
          public static Result success()
          {
              return new Result(Result.Kind.SUCCESS, null);
          }
  
          public static Result success(String msg)
          {
              return new Result(Result.Kind.SUCCESS, msg);
          }
  
          public static Result skip(String msg)
          {
              return new Result(Result.Kind.SKIPPED, msg);
          }
  
          public static Result fail(String msg)
          {
              return new Result(Result.Kind.FAILURE, msg);
          }
  
          @Override
          public boolean equals(Object o)
          {
              if (this == o) return true;
              if (o == null || getClass() != o.getClass()) return false;
              Result result = (Result) o;
              return kind == result.kind && Objects.equals(message, result.message);
          }
  
          @Override
          public int hashCode()
          {
              return Objects.hash(kind, message);
          }
  
          @Override
          public String toString()
          {
              return "Result{" +
                     "kind=" + kind +
                     ", message='" + message + '\'' +
                     '}';
          }
      }
  }
  