Class CollectingBarrierStep<S>

    • Constructor Detail

      • CollectingBarrierStep

        public CollectingBarrierStep​(Traversal.Admin traversal)
      • CollectingBarrierStep

        public CollectingBarrierStep​(Traversal.Admin traversal,
                                     int maxBarrierSize)
    • Method Detail

      • barrierConsumer

        public abstract void barrierConsumer​(TraverserSet<S> traverserSet)
      • getRequirements

        public Set<TraverserRequirement> getRequirements()
        Description copied from interface: Step
        Provide the necessary TraverserRequirement that must be met by the traverser in order for the step to function properly. The provided default implements returns an empty set.
        Specified by:
        getRequirements in interface Step<S,​S>
        Returns:
        the set of requirements
      • processAllStarts

        public void processAllStarts()
        Description copied from interface: Barrier
        Process all left traversers by do not yield the resultant output. This method is useful for steps like ReducingBarrierStep, where traversers can be processed "on the fly" and thus, reduce memory consumption.
        Specified by:
        processAllStarts in interface Barrier<S>
      • hasNextBarrier

        public boolean hasNextBarrier()
        Description copied from interface: Barrier
        Whether or not the step has an accessible barrier.
        Specified by:
        hasNextBarrier in interface Barrier<S>
        Returns:
        whether a barrier exists or not
      • addBarrier

        public void addBarrier​(TraverserSet<S> barrier)
        Description copied from interface: Barrier
        Add a barrier to the step. This typically happens when multiple parallel barriers need to become one barrier at a single step.
        Specified by:
        addBarrier in interface Barrier<S>
        Parameters:
        barrier - the barrier to merge in
      • clone

        public CollectingBarrierStep<S> clone()
        Description copied from interface: Step
        Cloning is used to duplicate steps for the purpose of traversal optimization and OLTP replication. When cloning a step, it is important that the steps, the cloned step is equivalent to the state of the step when Step.reset() is called. Moreover, the previous and next steps should be set to EmptyStep.
        Specified by:
        clone in interface Step<S,​S>
        Overrides:
        clone in class AbstractStep<S,​S>
        Returns:
        The cloned step
      • reset

        public void reset()
        Description copied from interface: Step
        Reset the state of the step such that it has no incoming starts. Internal states are to be reset, but any sideEffect data structures are not to be recreated.
        Specified by:
        reset in interface Step<S,​S>
        Overrides:
        reset in class AbstractStep<S,​S>