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.concurrent;
  
  import java.util.concurrent.Callable;
  
  import org.apache.cassandra.utils.MonotonicClock;
  import org.apache.cassandra.utils.Shared;
  
  import static org.apache.cassandra.utils.Shared.Recursive.INTERFACES;
  import static org.apache.cassandra.utils.Shared.Scope.SIMULATION;
  
  /**
   * Interface to include on a Runnable or Callable submitted to the {@link SharedExecutorPool} to provide more
   * detailed diagnostics.
   */
  @Shared(scope = SIMULATION, inner = INTERFACES)
  public interface DebuggableTask
  {
      public default long elapsedSinceCreation()
      {
          return MonotonicClock.Global.preciseTime.now() - creationTimeNanos();
      }
  
      public long creationTimeNanos();
  
      public long startTimeNanos();
  
      public String description();
  
      interface RunnableDebuggableTask extends Runnable, DebuggableTask {}
      interface CallableDebuggableTask<T> extends Callable<T>, DebuggableTask {}
      interface DebuggableTaskRunner
      {
          DebuggableTask running();
          String id();
      }
  
      /**
       * Wraps a {@link DebuggableTask} to include the name of the thread running it.
       */
      public static class RunningDebuggableTask implements DebuggableTask
      {
          private final DebuggableTask task;
          private final String threadId;
  
          public RunningDebuggableTask(String threadId, DebuggableTask task)
          {
              this.task = task;
              this.threadId = threadId;
          }
  
          public String threadId()
          {
              return threadId;
          }
  
          public boolean hasTask()
          {
              return task != null;
          }
  
          @Override
          public long creationTimeNanos()
          {
              assert hasTask();
              return task.creationTimeNanos();
          }
  
          @Override
          public long startTimeNanos()
          {
              assert hasTask();
              return task.startTimeNanos();
          }
  
          @Override
          public String description()
          {
              assert hasTask();
              return task.description();
          }
      }
  }
  