ParkingLot | Parking Space Detection in OpenCV | Computer Vision library

I am getting below error while accessing inner class __OnlyOne from outer. what is wrong here? I am trying to use a singleton design pattern here by creating only one instance of inner object to outer.

Is there any way of dynamically checking and setting parameters of the agents in AnyLogic by evaluating/executing strings?

My case:

• I have parking lots numbered from 0 to 200, named as parkingLot0, parkingLot1,...,parkingLot200 (each with capacity of 1).
• I have an agent called DetachedTrailer.
• I want to find an empty parking slot for the arriving DetachedTrailer and set agent.parking to that parkingLot.
• I do not want to do this manually one-by-one, instead would like to have a short loop that would do the trick.

I try using executeExpression, but it throws error saying *Exception during discrete event execution:

root:

null*

Please see the function body of the screenshot below.

Unfortunately the documentation does not have much information about executeExpression. Any help would be appreciated.

The addProject function of my code is updating state correctly but the new project is not added to the DOM afterwards. WHY?

What I tried so far:

1. forceUpdate()
2. Made a deep copy of the array
3. Changed the key for the map to be the project title

Using spring-cloud-stream from spring-cloud Hoxton.SR12 release with Kafka Binder. Boot version: 2.5.2

Problem statement:

• I would like to handle deserialisation errors by pushing them to a poison-pill topic with no retries.

• Handle any other exceptions by retrying and then pushing to a parkingLot topic.

• Do not retry ValidationException

This is my error handling code so far:

So, I'm building a RESTful API, that's like a Parking system, it have ParkingLots and Cars that enter or leave ParkingLots, at this moment, my endpoints looks like this.

POST '/parking-lots' // To create a ParkingLot

POST '/cars' // To create a Car

But, how to name an endpoint that has EnterParkingLot or LeaveParkingLot feature following REST best pratices? I didn't found an article or blog post that answer this question so far.

I am using Spring AMQP to listen RabbitMQ queue. While listening queue, depending on business logic, my service can throw RuntimeException and in this case message will retry several times. After max count retries, message will stay in DLQ. And I am wondering, what is the best approach to deal with these messages in DLQ? I read from blogs that I can use ParkingLot Queue. But also in this case, how to monitor the queue and notify people about dead-letter messages? P.S. Sorry for my English. Hope that I was able to explain my problem :)

I have a simple Springboot application in which I am trying to use in memory HashMap as a DB to store some info. This is my restcontroler

I have a ParkingLot class with a getEmptySpaces() method that applies to ParkingLot objects, which are arrays of Car objects.

I want to call lot.getEmptySpaces(), but my IDE, Netbeans, throws a fit if I give it an array rather than a specific item. lot[1].getEmptySpaces() compiles fine, but crashes when it runs, as expected, since it's supposed to receive an array, not a null.

How do I call a method on an array defined by the same class?

I have a class, ParkingLot, and I need to write a method called, enter() that will check if the parking lot has any vacancies. If it does, I enter the cars license plate number and decrease the vacancy count by 1.

So far everything is working except when the parking lot becomes full, I need to adjust the vacantSpaces to 0.

What I have so far: