private static HistoryEvent getNextEvent()

in tez-dag/src/main/java/org/apache/tez/dag/app/RecoveryParser.java [128:229]
99 lines of code
27 McCabe index (conditional complexity)

  private static HistoryEvent getNextEvent(FSDataInputStream inputStream)
      throws IOException {
    int eventTypeOrdinal = -1;
    try {
      eventTypeOrdinal = inputStream.readInt();
    } catch (EOFException eof) {
      return null;
    }
    if (eventTypeOrdinal < 0 || eventTypeOrdinal >=
        HistoryEventType.values().length) {
      // Corrupt data
      // reached end
      throw new IOException("Corrupt data found when trying to read next event type"
          + ", eventTypeOrdinal=" + eventTypeOrdinal);
    }
    HistoryEventType eventType = HistoryEventType.values()[eventTypeOrdinal];
    HistoryEvent event;
    switch (eventType) {
      case AM_LAUNCHED:
        event = new AMLaunchedEvent();
        break;
      case AM_STARTED:
        event = new AMStartedEvent();
        break;
      case DAG_SUBMITTED:
        event = new DAGSubmittedEvent();
        break;
      case DAG_INITIALIZED:
        event = new DAGInitializedEvent();
        break;
      case DAG_STARTED:
        event = new DAGStartedEvent();
        break;
      case DAG_COMMIT_STARTED:
        event = new DAGCommitStartedEvent();
        break;
      case DAG_FINISHED:
        event = new DAGFinishedEvent();
        break;
      case CONTAINER_LAUNCHED:
        event = new ContainerLaunchedEvent();
        break;
      case CONTAINER_STOPPED:
        event = new ContainerStoppedEvent();
        break;
      case VERTEX_INITIALIZED:
        event = new VertexInitializedEvent();
        break;
      case VERTEX_STARTED:
        event = new VertexStartedEvent();
        break;
      case VERTEX_PARALLELISM_UPDATED:
        event = new VertexParallelismUpdatedEvent();
        break;
      case VERTEX_COMMIT_STARTED:
        event = new VertexCommitStartedEvent();
        break;
      case VERTEX_GROUP_COMMIT_STARTED:
        event = new VertexGroupCommitStartedEvent();
        break;
      case VERTEX_GROUP_COMMIT_FINISHED:
        event = new VertexGroupCommitFinishedEvent();
        break;
      case VERTEX_FINISHED:
        event = new VertexFinishedEvent();
        break;
      case TASK_STARTED:
        event = new TaskStartedEvent();
        break;
      case TASK_FINISHED:
        event = new TaskFinishedEvent();
        break;
      case TASK_ATTEMPT_STARTED:
        event = new TaskAttemptStartedEvent();
        break;
      case TASK_ATTEMPT_FINISHED:
        event = new TaskAttemptFinishedEvent();
        break;
      case VERTEX_DATA_MOVEMENT_EVENTS_GENERATED:
        event = new VertexDataMovementEventsGeneratedEvent();
        break;
      default:
        throw new IOException("Invalid data found, unknown event type "
            + eventType);

    }
    if (LOG.isDebugEnabled()) {
      LOG.debug("Parsing event from input stream"
          + ", eventType=" + eventType);
    }
    try {
      event.fromProtoStream(inputStream);
    } catch (EOFException eof) {
      return null;
    }
    if (LOG.isDebugEnabled()) {
      LOG.debug("Parsed event from input stream"
          + ", eventType=" + eventType
          + ", event=" + event.toString());
    }
    return event;
  }