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.simulator.systems;
  
  import java.util.Collections;
  import java.util.Map;
  import java.util.function.Consumer;
  
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.distributed.api.IIsolatedExecutor.SerializableRunnable;
  import org.apache.cassandra.net.Verb;
  import org.apache.cassandra.simulator.ActionList;
  import org.apache.cassandra.simulator.OrderOn;
  import org.apache.cassandra.simulator.OrderOns;
  import org.apache.cassandra.simulator.systems.InterceptedExecution.InterceptedTaskExecution;
  import org.apache.cassandra.utils.Throwables;
  
  import static org.apache.cassandra.simulator.systems.SimulatedAction.Kind.TASK;
  
  public class SimulatedActionTask extends SimulatedAction implements Runnable
  {
      InterceptedExecution task;
  
      public SimulatedActionTask(Object description, Modifiers self, Modifiers transitive, Verb forVerb, SimulatedSystems simulated, InterceptedExecution task)
      {
          this(description, TASK, OrderOn.NONE, self, transitive, Collections.emptyMap(), forVerb, simulated, task);
      }
  
      public SimulatedActionTask(Object description, Kind kind, OrderOn orderOn, Modifiers self, Modifiers transitive, Map<Verb, Modifiers> verbModifiers, Verb forVerb, SimulatedSystems simulated, InterceptedExecution task)
      {
          super(description, kind, orderOn, self, transitive, verbModifiers, forVerb, simulated);
          this.task = task;
          task.onCancel(this);
      }
  
      public SimulatedActionTask(Object description, Modifiers self, Modifiers children, SimulatedSystems simulated, IInvokableInstance on, SerializableRunnable run)
      {
          super(description, self, children, null, simulated);
          this.task = unsafeAsTask(on, asSafeRunnable(on, run), simulated.failures);
          task.onCancel(this);
      }
  
      public SimulatedActionTask(Object description, Modifiers self, Modifiers children, SimulatedSystems simulated, Map<Verb, Modifiers> verbModifiers, IInvokableInstance on, SerializableRunnable run)
      {
          super(description, TASK, OrderOns.NONE, self, children, verbModifiers, null, simulated);
          this.task = unsafeAsTask(on, asSafeRunnable(on, run), simulated.failures);
          task.onCancel(this);
      }
  
      private SimulatedActionTask(Object description, Modifiers self, Modifiers children, SimulatedSystems simulated, IInvokableInstance on, InterceptedExecution task)
      {
          super(description, self, children, null, simulated);
          this.task = task;
          task.onCancel(this);
      }
  
      /**
       * To be used to create actions on runnable that are not serializable but are anyway safe to invoke
       */
      public static SimulatedActionTask unsafeTask(Object description, Modifiers self, Modifiers transitive, SimulatedSystems simulated, IInvokableInstance on, Runnable run)
      {
          return new SimulatedActionTask(description, self, transitive, simulated, on, unsafeAsTask(on, run, simulated.failures));
      }
  
      protected static Runnable asSafeRunnable(IInvokableInstance on, SerializableRunnable run)
      {
          return () -> on.unsafeRunOnThisThread(run);
      }
  
      protected static InterceptedTaskExecution unsafeAsTask(IInvokableInstance on, Runnable runnable, Consumer<? super Throwable> onFailure)
      {
          return new InterceptedTaskExecution((InterceptingExecutor) on.executor())
          {
              public void run()
              {
                  // we'll be invoked on the node's executor, but we need to ensure the task is loaded on its classloader
                  try { runnable.run(); }
                  catch (Throwable t) { onFailure.accept(t); }
              }
          };
      }
  
      @Override
      protected InterceptedExecution task()
      {
          return task;
      }
  
      @Override
      protected ActionList performAndRegister()
      {
          try
          {
              return super.performAndRegister();
          }
          finally
          {
              task = null;
          }
      }
  
      @Override
      protected Throwable safeInvalidate(boolean isCancellation)
      {
          try
          {
              if (task != null)
              {
                  task.onCancel(null);
                  task.cancel();
                  task = null;
              }
  
              return super.safeInvalidate(isCancellation);
          }
          catch (Throwable t)
          {
              return Throwables.merge(t, super.safeInvalidate(isCancellation));
          }
      }
  
      @Override
      public void run()
      {
          // cancellation invoked on the task by the application
          task = null;
          super.cancel();
      }
  }
  