# Package org.apache.tinkerpop.gremlin.process.traversal.step

- Interface Summary
  Interface | Description
  --- | ---
  Barrier<B> | A Barrier is any step that requires all left traversers to be processed prior to emitting result traversers to the right.
  ByModulating | A `ByModulating` step is able to take `GraphTraversal.by()` calls.
  Bypassing | A `ByPassing` step can be stated (at runtime) to simply enact the identity function.
  ComparatorHolder<S,C extends Comparable> |
  FromToModulating | FromToModulating are for `Step`s that support from()- and to()-modulation.
  Generating<S,E> | A `Generating` step is one that has a side-effect that needs post-processing prior to being returned.
  GraphComputing | A `GraphComputing` step is one that will change its behavior whether its on a `GraphComputer` or not.
  HasContainerHolder |
  LambdaHolder | This is a marker interface stating that the `Step` contains a lambda/anonymous function.
  LocalBarrier<S> |
  MapReducer<MK,MV,RK,RV,R> |
  MemoryComputing<M> | A `MemoryComputing` step uses `Memory` to effect its computation on a `GraphComputer`.
  Mutating<E extends Event> | A marker interface for steps that modify the graph.
  PathProcessor |
  Profiling | A `Step` can implement this interface in order to receive a reference to the `MutableMetrics` object for the `Step`.
  ProfilingAware | Marks a `Step` as one that is aware of profiling.
  Ranging |
  Scoping | This interface is implemented by `Step` implementations that access labeled path steps, side-effects or `Map` values by key, such as `select('a')` step.
  SideEffectCapable<S,E> | A `SideEffectCapable` step stores a side-effect data structure accessible by a side-effect key.
  TimesModulating | A `TimesModulating` step is one that can do something with `GraphTraversal.times(int)`.
  TraversalOptionParent<M,S,E> |
  TraversalParent |

- Class Summary
  Class | Description
  --- | ---
  ComplexTest |
  ComplexTest.Traversals |
  ProfilingAware.ProfiledBarrier | A helper class which holds a `Barrier` and it's related `ProfileStep` so that the latter can have its timer started and stopped appropriately.

- Enum Summary
  Enum | Description
  --- | ---
  PathProcessor.ElementRequirement |
  Scoping.Variable |
  TraversalOptionParent.Pick |

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