Package com.vaadin.signals.impl

Interface UsageTracker.Usage

Enclosing class:
UsageTracker
public static interface UsageTracker.Usage
Tracks the state of some used value.

  • Method Summary

    Modifier and Type
    Method
    Description
    boolean
    hasChanges()
    Checks whether the used value has subsequently been changed.
    Runnable
    onNextChange(TransientListener listener)
    Registers a listener that will be invoked the next time there's a change to the used value.

  • Method Details

    • hasChanges

      boolean hasChanges()
      Checks whether the used value has subsequently been changed.
      Returns:
      true if the value has been changed, false if there is no change

    • onNextChange

      Runnable onNextChange(TransientListener listener)
      Registers a listener that will be invoked the next time there's a change to the used value. If this usage already has changes, then the listener is invoked immediately.
      Parameters:
      listener - the listener to use, not null
      Returns:
      a callback for removing the listener, not null