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.worker.job.task;
  
  import alluxio.exception.JobDoesNotExistException;
  import alluxio.exception.status.CancelledException;
  import alluxio.grpc.RunTaskCommand;
  import alluxio.job.JobConfig;
  import alluxio.job.RunTaskContext;
  import alluxio.job.plan.PlanDefinition;
  import alluxio.job.plan.PlanDefinitionRegistry;
  import alluxio.job.util.SerializationUtils;
  
  import com.google.common.base.Preconditions;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.io.Serializable;
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * A thread that runs the task.
   */
  @NotThreadSafe
  public final class TaskExecutor implements Runnable {
    private static final Logger LOG = LoggerFactory.getLogger(TaskExecutor.class);
  
    private final long mJobId;
    private final long mTaskId;
    private final RunTaskCommand mRunTaskCommand;
    private final RunTaskContext mContext;
    private final TaskExecutorManager mTaskExecutorManager;
  
    /**
     * Creates a new instance of {@link TaskExecutor}.
     *
     * @param jobId the job id
     * @param taskId the task id
     * @param runTaskCommand the run task command
     * @param context the context on the worker
     * @param taskExecutorManager the task executor manager
     */
    public TaskExecutor(long jobId, long taskId, RunTaskCommand runTaskCommand,
        RunTaskContext context, TaskExecutorManager taskExecutorManager) {
      mJobId = jobId;
      mTaskId = taskId;
      mRunTaskCommand = runTaskCommand;
      mContext = Preconditions.checkNotNull(context);
      mTaskExecutorManager = Preconditions.checkNotNull(taskExecutorManager);
    }
  
    @Override
    public void run() {
      JobConfig jobConfig = null;
      Serializable taskArgs = null;
      try {
        jobConfig = (JobConfig) SerializationUtils.deserialize(
            mRunTaskCommand.getJobConfig().toByteArray());
        if (mRunTaskCommand.hasTaskArgs()) {
          taskArgs = SerializationUtils.deserialize(mRunTaskCommand.getTaskArgs().toByteArray());
        }
      } catch (IOException | ClassNotFoundException e) {
        fail(e, jobConfig, null);
      }
  
      PlanDefinition<JobConfig, Serializable, Serializable> definition;
      try {
        definition = PlanDefinitionRegistry.INSTANCE.getJobDefinition(jobConfig);
      } catch (JobDoesNotExistException e) {
        LOG.error("The job definition for config {} does not exist.", jobConfig.getName());
        fail(e, jobConfig, taskArgs);
        return;
      }
  
      mTaskExecutorManager.notifyTaskRunning(mJobId, mTaskId);
      Serializable result;
      try {
        result = definition.runTask(jobConfig, taskArgs, mContext);
      } catch (InterruptedException | CancelledException e) {
        // Cleanup around the interruption should already have been handled by a different thread
        Thread.currentThread().interrupt();
        return;
      } catch (Throwable t) {
        fail(t, jobConfig, taskArgs);
        return;
      }
      mTaskExecutorManager.notifyTaskCompletion(mJobId, mTaskId, result);
    }
  
    private void fail(Throwable t, JobConfig jobConfig, Serializable taskArgs) {
      mTaskExecutorManager.notifyTaskFailure(mJobId, mTaskId, t);
  
      LOG.warn("Exception running task for job {}({}) : {}",
          (jobConfig == null) ? "Undefined" : jobConfig.getName(),
          (taskArgs == null) ? "Undefined" : taskArgs.toString(), t.getMessage());
      return;
    }
  }
  