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Pipeline Direction

The auto-pipeline also introduced the @PipelineDirection annotation for the pipeline.

Specify the direction​

We can specify the direction on methods or interfaces.

The default direction is @Direction.FORWARD, here's the rules:

  • Rule1: in the @AutoPipeline interface's method, we can:
    • add Direction.FORWARD to apply the interface's method, the annotated method will be called from head to tail
    • add Direction.REVERSE to apply the interface's method, the annotated method will be called from tail to head
    • if there's no Direction annotation to the method, the direction of pipeline will follow the Direction in the in the @AutoPipeline interface, see rule2
    • Direction.FORWARD and Direction.REVERSE are mutually exclusive, they cannot coexist
  • Rule2: in the @AutoPipeline interface, we can:
    • add Direction.FORWARD to the @AutoPipeline interface, the methods declared in this interface will be called from head to tail unless the method is annotated with Direction in the method level
    • add Direction.REVERSE to the @AutoPipeline interface, the methods declared in this interface will be called from tail to head unless the method is annotated with Direction in the method level
    • if no Direction annotation to the @AutoPipeline interface, it equals to add Direction.FORWARD to the @AutoPipeline interface
    • Direction.FORWARD and Direction.REVERSE are mutually exclusive, they cannot coexist

Direction example​

For examples, please check the RPC example and the test case.