private val client = OkHttpClient()

      fun run() {
        val request = Request.Builder()
            .url("http://httpbin.org/delay/2") // This URL is served with a 2 second delay.
            .build()

        val startNanos = System.nanoTime()
        val call = client.newCall(request)

        // Schedule a job to cancel the call in 1 second.

      eachQueue@ for (queue in readyQueues) {
        val candidate = queue.futureTasks[0]
        val candidateDelay = maxOf(0L, candidate.nextExecuteNanoTime - now)

        when {
          // Compute the delay of the soonest-executable task.
          candidateDelay > 0L -> {
            minDelayNanos = minOf(candidateDelay, minDelayNanos)
            continue@eachQueue
          }

    }

    /**
     * Deletes a document asynchronously.
     *
     * @param request the delete request
     * @return a future for the delete response
     */
    @Override
    public ActionFuture<DeleteResponse> delete(final DeleteRequest request) {
        return client.delete(request);
    }

    /**
     * Deletes a document asynchronously with a callback.
     *