def received = new LinkedBlockingQueue()
    def dispatch = { received << it } as Dispatch

    def receivedCommand() {
        received.poll(5, TimeUnit.SECONDS)
    }

    boolean receiveCancel() {
        receivedCommand() instanceof Cancel
    }

    def forwarder

    def createForwarder() {
        forwarder = new DaemonCancelForwarder(dispatch, cancellationToken)
        forwarder.start()