# Package org.apache.jmeter.visualizers.backend

- Interface Summary
  Interface | Description
  --- | ---
  Backend | Identifies Backend components
  BackendListenerClient | This interface defines the interactions between the `BackendListener` and external Java programs which can be executed by JMeter.

- Class Summary
  Class | Description
  --- | ---
  AbstractBackendListenerClient | An abstract implementation of the BackendListenerClient interface.
  BackendListener | Async Listener that delegates SampleResult handling to implementations of `BackendListenerClient`
  BackendListenerContext | BackendListenerContext is used to provide context information to a BackendListenerClient implementation.
  BackendListenerGui | The `BackendListenerGui` class provides the user interface for the `BackendListener` object.
  ErrorMetric | Object representing an error by a response code and response message
  SamplerMetric | Sampler metric
  UserMetric | User metric

- Enum Summary
  Enum | Description
  --- | ---
  WindowMode | Metrics are sent into boxes which can be `a fixed-size sliding window` or `time boxed`.

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