# Package org.apache.uima.flow

- Interface Summary
  Interface | Description
  --- | ---
  Flow | A Flow object is responsible for routing a single CAS through an Aggregate Analysis Engine.
  FlowController | FlowControllers are components that decide how to route CASes within Aggregate Analysis Engines.
  FlowControllerContext | A subtype of `UimaContext` used by `FlowController` components.
  FlowControllerDescription | A `FlowControllerDescription` contains all of the information needed to instantiate and use a `FlowController`.

- Class Summary
  Class | Description
  --- | ---
  CasFlow_ImplBase | Convenience base class for Flow objects that use the CAS interface.
  CasFlowController_ImplBase | Base class to be extended by FlowControllers that use the `CAS` interface.
  FinalStep | Indicates that a CAS has finished being processed by the aggregate.
  FlowController_ImplBase | Implementation base class for FlowControllers.
  JCasFlow_ImplBase | Convenience base class for Flow objects that use the JCas interface.
  JCasFlowController_ImplBase | Base class to be extended by FlowControllers that use the `JCas` interface.
  ParallelStep | Indicates that a CAS should be routed to a multiple AnalysisEngines and that the relative order in which these execute does not matter.
  SimpleStep | Indicates that a CAS should be routed to a single AnalysisEngine.
  SimpleStepWithResultSpec | Deprecated For backwards compatibility with Capability Language Flow only.
  Step | Represents the next destination or destinations to which a CAS should be routed.

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