heartbeat | Health monitoring of HTTP services and databases | REST library

form the official pika documentation

Is Pika thread safe?

Pika does not have any notion of threading in the code. If you want to use Pika with threading, make sure you have a Pika connection per thread, created in that thread. It is not safe to share one Pika connection across threads, with one exception: you may call the connection method add_callback_threadsafe from another thread to schedule a callback within an active pika connection.

so your solution can work with a single thread

If you want one result per day, then use DISTINCT ON. Assuming the "day" is based on datetime:

Finally solved - you have to define a custom AMQPChannel with a custom AMQPConnection with SSL options and then set this AMQPChannel to the producer:

The question still really isn't clear, but if you want to use that code in a function node then I suggest the following:

Put that code into the "On Start" tab of the function node, but change the first line to the following:

Navigating within a Vaadin UI will change the URL in your browser, but it will not necessarily create a browser request to that exact URL, effectively bypassing the access control defined by Spring security for that URL. As such, Vaadin is really not suited for the request URL-based security approach that Spring provides. For this issue alone you could take a look at my add-on Spring Boot Security for Vaadin which I specifically created to close the gap between Spring security and Vaadin.

But while creating two distinct Spring security contexts based on the URL is fairly easy, this - for the same reason - will not work well or at all with Vaadin. And that's something even my add-on couldn't help with.

Update: As combining both security contexts is an option for you, I can offer the following solution (using my add-on): Starting from the Keycloak example, you would have to do the following:

1. Change WebSecurityConfig to also add your DB-based AuthenticationProvider. Adding your UserDetailsService should still be enough. Make sure to give every user a suitable role.
2. You have to remove this line from application.properties: codecamp.vaadin.security.standard-auth.enabled = false This will re-enable the standard login without Keycloak via a Vaadin view.
3. Adapt the KeycloakRouteAccessDeniedHandler to ignore all test views that shouldn't be protected by Keycloak.

I already prepared all this in Gitlab repo and removed everything not important for the main point of this solution. See the individual commits and their diffs to also help focus in on the important bits.

Regarding the purpose of heart-beating the STOMP 1.2 specification just says:

Heart-beating can optionally be used to test the healthiness of the underlying TCP connection and to make sure that the remote end is alive and kicking.

Heart-beats potentially flow both from the client to the server and from the server to the client so the "remote end" referenced in the spec here could be the client or the server.

For the server, heart-beating is useful to ensure that server-side resources are cleaned up in a timely manner to avoid excessive strain. Server-side resources are maintained for all client connections and it helps the broker to be able to detect quickly when those connections fail (i.e. heart-beats aren't received) so it can clean up those resources. If heart-beating is disabled then it's possible that a dead connection would not be detected and the server would have to maintain its resources for that dead connection in vain.

For a client, heart-beating is useful to avoid message loss when performing asynchronous sends. Messages are often sent asynchronously by clients (i.e. fire and forget). If there was no mechanism to detect connection loss the client could continue sending messages async on a dead connection. Those messages would be lost since they would never reach the broker. Heart-beating mitigates this situation.

Well, for starters, you don't need to convert your downloaded string to an ASCII encoded TBytes. TJSONObject.ParseJSONValue() has an overload that takes a string as input.

Second, LJsonObj.Get('ATTITUDE').JsonValue will return a TJSONObject, which you are incorrectly type-casting to a TJSONPair. But that doesn't matter, since you are then ignoring that TJSONPair and instead incorrectly type-casting the input parameter sVALUE from a string to a TJSONPair and then trying to access its children. That is why you are getting the Access Violation.

But even if you were able to find the TJSONPair for the roll value, you are returning the string value of its JsonString (name) property, not the string value of its JsonValue (value) property.

Try this instead:

I have managed to solve the error related to the mlUpdate task, the issue was that I was referencing the .mlmodel instead of the compiled version, which is .mlmodelc . When building the iOS app from Xcode this file is automatically generated.

I now get the following error:

Something like this might do it for you