# Package io.vertx.core.spi

- Interface Summary
  Interface | Description
  --- | ---
  BufferFactory |
  FutureFactory |
  PumpFactory |
  VerticleFactory | Has responsibility for creating verticle instances.
  VertxFactory | Factory for creating Vertx instances.
  VertxMetricsFactory | A factory for the plugable metrics SPI.
  WebSocketFrameFactory |

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