Package org.eclipse.rdf4j.query.impl

Class QueueCursor<E>

  • All Implemented Interfaces:
    AutoCloseable, Iterator<E>, org.eclipse.rdf4j.common.iteration.CloseableIteration<E>
    public class QueueCursor<E>
extends org.eclipse.rdf4j.common.iteration.QueueIteration<E,​QueryEvaluationException>
    Makes working with a queue easier by adding the methods QueueIteration.done() and QueueIteration.toss(Exception) and automatically converting the exception into a QueryEvaluationException with an appropriate stack trace.
    Author:
    James Leigh

    • Constructor Summary

      Constructors 
      Constructor Description
      QueueCursor​(int capacity)
      Creates an QueueCursor with the given (fixed) capacity and default access policy.
      QueueCursor​(BlockingQueue<E> queue)
      Deprecated.
      WeakReference is no longer supported as a way to automatically close this iteration.

    • Constructor Detail

      • QueueCursor

        public QueueCursor​(int capacity)
        Creates an QueueCursor with the given (fixed) capacity and default access policy.
        Parameters:
        capacity - the capacity of this queue

      • QueueCursor

        public QueueCursor​(BlockingQueue<E> queue)
        Deprecated.
        WeakReference is no longer supported as a way to automatically close this iteration. The recommended approach to automatically closing an iteration on garbage collection is to use a Cleaner.
        Creates an QueueCursor with the given BlockingQueue as its backing queue.
        It may not be threadsafe to modify or access the given BlockingQueue from other locations. This method only enables the default ArrayBlockingQueue to be overridden.
        Parameters:
        queue - A BlockingQueue that is not used in other locations, but will be used as the backing Queue implementation for this cursor.