IParser | *.ini parser - * | Parser library
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QUESTION
Looking for a way to avoid duplication when creating different, flexible FSMs within single application.
I have a concept below, under the heading 0: BEFORE Requirements Change. This concept shows how FSMs of different products can be created, and how an FSM can run. Only one product's FSM can run on a station/computer at any given time, but one station can allow for multiple products (at different times). For context, this is a manufacturing environment, and there are many products which go through a scanning process. Some products have commonalities in their process, like Product A and B (set up batch for product -> scan a part -> apply business logic -> repeat for multiple parts until batch complete, label printed -> set up next batch...). But other products have different processes, like Product C. Products' processes can also require/include/exclude varying components (different devices, databases, business logic); this is all shown under 0: BEFORE Requirements Change.
Now, say the requirements change (which has happened multiple times in the past), and a new step is needed in-between existing steps for multiple products' FSMs (for example, need to trigger a camera and process the image). Furthermore, this additional step might be just a trial phase, and will need to be disabled. I'll now have to go and change every single FSMCreator, as shown under heading 1: AFTER Requirements Change. When there are many products (ALOT more than 3), big process changes like this have been error-prone and difficult to manage.
Is there a better/cleaner way of organizing the architecture or creating the FSMs, so that this duplication is avoided?
The problem stems from how different FSMs can share some common steps, or have some common components, but are not 100% the same. Essentially, there are many different mixing-and-matching variations of components (devices, databases, business logic), states, and transitions. Ultimately, it is the product's process that defines the FSM, so each product needs to know how to create its FSM. This is why I have a different FSMCreator class for each product, to handle the different processes per product. But as shown, this leads to duplication.
0: Before Requirements Change ...ANSWER
Answered 2022-Mar-28 at 07:06You have to always edit your code as your requirements always change. And it looks like you will always have to change your code if you will stick with this approach.
So we've figured out that your workflow always changes. Our goal is to make minimum changes in code.
What we can do? We can move your workfow in storage and based on this data we can run your FSM. This is how Jira workflow works.. They have many users and it would be really hard to edit code per workflow and it is not possible. How they solved their problem? Jira stores workflow like data and they edit data, not code.
This is a rough example, not a complete solution, however it will show the direction of how to write solution that will be fit to open closed principle.
So, you can store your workflow in json file:
QUESTION
I am new to writing CSV files with CsvHelper API. I have read the Getting Started help topic.
I have a requirement to create a empty CSV file with just the headers defined. This is so that the user can start from this template file and populate with data.
I know how to manually create a text file and to do it manually myself. But since I have my class with properties for reading CSV I wondered if I could make use of it for doing the reverse?
I see an example there with WriteHeader so I have come up with:
ANSWER
Answered 2022-Jan-22 at 18:58I have generally found that it will be in the same order as the properties are declared in your class. However, if you want to be certain they are in a particular order, I would use both.
The
GetPropertiesmethod does not return properties in a particular order, such as alphabetical or declaration order. Your code must not depend on the order in which properties are returned, because that order varies.
You can try this example and see that both the Name and Index attributes will work when using CsvWriter.
QUESTION
I'm trying to make a N-layer architecture for my Telegram Bot. I created DAL, BLL and PL. I would like to add entity News to my DB. But I have some issue with my context.
My DB Context:
...ANSWER
Answered 2021-Sep-21 at 10:50There are few problems in your code.
- Controllers are scoped entities, their instances created per http request and disposed after request is finished. It means controller is not good place to subscribe to events. When you call
/startendpoint you create an instance ofTelegramControllerandTelegramBotClient, but once the request is finished, the controller and all its non-singleton dependencies (IParserin your case) are disposed. But you subscribed forTelegramBotClientevents that captured reference toIParser. It means all events that will arrive after request is finished will try to access disposedIParserinstance and this is the reason for your exception.
For event based messages it's better to use IHostedService. You will need to useIServiceScopeFactoryto create a scope for each message and resolve your dependencies from this scope.
QUESTION
It might seem that this question is a duplicate of this question, however either Parsec or the Indent library has changed since 2012 and none of the old examples I have found for the indent library compile with the latest versions.
I want to make a parser for a programming language where indentation is part of the syntax (used to indicate scopes), in order to achieve this I want to make use of the Text.Parsec.Indent library, but I am at a loss on how to use it. It is clear to me that some modifications/custom parser type has to be made, but my limited knowledge on the State monad and surface level understanding of parsec seem to not be enough.
Let's say you wanted to make a parser for a simple list of ints like below. How would one achieve this?
...ANSWER
Answered 2021-Jun-25 at 14:04Okay after some deep diving into the source code and looking at the tests in the indents GitHub repository I managed to create a working example.
The following code can parse a simple indented list:
QUESTION
I'm using C#, YamlDotNet and following the example: How to deserialize YAML with YAMLDotNet?
But I'm getting the follow error:
...ANSWER
Answered 2021-Jan-26 at 11:46There are a few problems here.
Firstly, your PlatForm and Version properties are of type List, but the value is just a string.
Secondly, your SOFTWARE property doesn't represent a list, but a map - the strings "Software-01" and "Software-02" are effectively keys within a map.
Thirdly, you've explicitly stated that you want to deserialize with a camel-case naming convention, but your YAML doesn't actually use that convention.
Here's a minimal, complete example with those aspects corrected:
QUESTION
I need to deserialize a JSON string into a type which is not know at compile time. There are several classes that it can be deserialized into. The name of the class is provided as input into the application and based on that I want to instantiate the class (already done this through reflection):
...ANSWER
Answered 2020-Jul-14 at 09:18Instead of using an generic method overload like JsonConvert.DeserializeObject(String) and having to resort to reflection as some comments state, you could simply use the non generic counterpart JsonConvert.DeserializeObject(String, Type), which just takes in a Type instance like you already have!
QUESTION
I want to register a interface to a specific implementation. The interface and the class both are generic instances, here it goes:
This is the container registration:
...ANSWER
Answered 2020-Apr-02 at 09:52Registering NpoiParser as IParser is like registering apple as orange.
NpoiParser does not implement IParser, it only implements IParser.
QUESTION
There is a problem in my simple program about heap corruption I unfortunately could not understand. this error happens when program ends
program is about reading a binary of specific length and split it to sub-packet then initialize a proper parser for each sub-packet and save all of parser in a deque
...HEAP CORRUPTION DETECTED: after Normal block (#182) at 0x005F2270. CRT detected that the application wrote to memory after end of heap buffer.
ANSWER
Answered 2020-Mar-02 at 14:28 uint8_t* buff = (uint8_t*)&output;
QUESTION
I have to process multiple parsers(irrelevant). How can I inject correctly so StepProcessor could receive all classes? My class is:
...ANSWER
Answered 2020-Feb-12 at 15:16You can use something called MultiBinding from Guice to achieve this.
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