Method Detail

• get

  <T> T get(AttributeSensor<T> key)

  Gets the value of the given attribute on this entity, or null if has not been set. Attributes can be things like workrate and status information, as well as configuration (e.g. url/jmxHost/jmxPort), etc.

• set

  <T> T set(AttributeSensor<T> attribute,
          T val)

  Sets the AttributeSensor data for the given attribute to the specified value. This can be used to "enrich" the entity, such as adding aggregated information, rolling averages, etc.

  Returns:

  the old value for the attribute (possibly null)

• modify

  @Beta
  <T> T modify(AttributeSensor<T> attribute,
                  com.google.common.base.Function<? super T,Maybe<T>> modifier)

  Atomically modifies the AttributeSensor, ensuring that only one modification is done at a time. If the modifier returns Maybe.absent() then the attribute will be left unmodified, and the existing value will be returned. For details of the synchronization model used to achieve this, refer to the underlying attribute store (e.g. AttributeMap).

  Returns:

  the old value for the attribute (possibly null)

  Since:

  0.7.0-M2

• emit

  <T> void emit(Sensor<T> sensor,
              T value)

  Emits a SensorEvent event on behalf of this entity (as though produced by this entity).

  Note that for attribute sensors it is nearly always recommended to use setAttribute, as this method will not update local values.