Creates a new {@code BrokerAvailabilityEvent}.
@param brokerAvailable {@code true} if the broker is available, {@code} false otherwise @param source the component that is acting as the broker, or as a relay for an external broker, that has changed availability. Must not be {@code null}.
See Implementation
Creates a new {@code BrokerAvailabilityEvent}.
@param brokerAvailable {@code true} if the broker is available, {@code} false otherwise @param source the component that is acting as the broker, or as a relay for an external broker, that has changed availability. Must not be {@code null}.