/**
     * @param routingContext
     * <p>
     * Responsible for retrieving all todos from the list and send as encoded json to user
     * </p>
     */
    private void getAllTodos(RoutingContext routingContext) {

        Map<Integer, String> todos = new HashMap<Integer, String>();

        JsonArray keys = awaitResult(r -> client.keys("*", r));

        for (Object k : keys) {
            String key = (String) k;
            String todomessage = awaitResult(h -> client.get(key, h));
            todos.put(Integer.parseInt(key), todomessage);
        }

        // Write the HTTP response
        // The response is in JSON using the utf-8 encoding
        // will return map of
        routingContext.response().putHeader("content-type", "application/json; charset=utf-8")
                .end(Json.encodePrettily(todos.values()));
    }