org.eclipse.rdf4j.federated.evaluation.concurrent

## Interface ParallelTask<T>

- All Known Implementing Classes:
    ParallelBoundJoinTask, ParallelCheckJoinTask, ParallelGetStatementsTask, ParallelJoinTask, ParallelLeftJoinTask, ParallelPreparedAlgebraUnionTask, ParallelPreparedUnionTask, ParallelServiceJoinTask, ParallelTaskBase, ParallelUnionOperatorTask, ParallelUnionTask, SourceSelection.ParallelCheckTask

      public interface ParallelTask<T>

  Interface for any parallel task that can be performed in Scheduler implementations.
  Author:
    Andreas Schwarte

- - ### Method Summary

    All Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `cancel()` Optional implementation to cancel this task on a best effort basis
    `ParallelExecutor<T>` | `getControl()` return the controlling instance, e.g.
    `default QueryInfo` | `getQueryInfo()`
    `CloseableIteration<T,QueryEvaluationException>` | `performTask()`

- - ### Method Detail

    - #### performTask

          CloseableIteration<T,QueryEvaluationException> performTask()
                                                              throws Exception

      Throws:
        `Exception`

    - #### getControl

          ParallelExecutor<T> getControl()

      return the controlling instance, e.g. in most cases the instance of a thread. Shared variables are used to inform the thread about new events.
      Returns:
        the control executor

    - #### getQueryInfo

          default QueryInfo getQueryInfo()

      Returns:
        the `QueryInfo`

    - #### cancel

          void cancel()

      Optional implementation to cancel this task on a best effort basis

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