windows – Why hosts need routing tables and when they are used in the communication pipeline?

windows – Why hosts need routing tables and when they are used in the communication pipeline? – Super User

Why does WiFi communication needs to split available frequency band into separate channels?

Why does the the available frequency for Wifi communication like 2.4GHZ and 5GHZ needs to be split into multiple channels at 5MHZ distance ? Why it was designed this way, what problem does it solve and how ?

Thanks

MVC architecture – communication between nested components

I’m working on a rich client desktop application. I’m trying to use MVC to decouple the model, view and controller responsabilities.
Problem is I can’t seem to find a clean solution for handling communication between nested components.

Most of the answers I’ve read online were either confusing or were dealing with “web MVC” architecture rather than real MVC.

I do not mind ending up using another MVC flavor (MVP, MVVM etc…) if it helps me creating a clean a maintainable architecture.

Scenario

The codebase is small and contains two classes: MainView, and MainController. So far the view and controller responsabilities are decoupled and the code is clean.

At some point the codebase grows and I need a SecondaryView with a button. When the button is clicked, the program needs to access the file system to perform operations.

Problem

How to handle the button click in a nested component (one level deep or more) without making a mess in my code?

What I tried so far

1 – One controller owning the nested view and a chain of observer/observables: unmaintainable code

MainController has a reference to MainView. MainView has a reference to SecondaryView.

When SecondaryViewButton is clicked, SecondaryView notifies its listener MainView which notifies its listener MainController which performs the file system operations.

This solution is even less maintainable when we nest components into components into components…

2 – Still one controller, but the main view now owns its nested views AND the controller

MainView has a reference to MainController and SecondaryView.

When SecondaryViewButton is clicked, SecondaryView notifies its listener MainView which directly calls performOperation() method on MainController.

This solution seems slightly better but it wouldn’t work if the clicked button is nested several levels deep.
Plus I suspect having a view reference BOTH controllers and other views is not a good idea?

3 – Multiple controllers, and each view has a reference to its controller

This solution seems better, but now all the controllers have to be able to access the file system (which is a common operation in this application) instead of a unique entry point when we just had MainController.
I’m not sure whether this would be a good idea in the long run.

The real problem however is I don’t have a clear understanding of how to nest components in a MVC architecture? Should I nest the views together and each view reference its own controller?

How would you solve the component nesting problem while maintaining a clean architecture?

Views Count missing on modern communication page in SharePoint Online

I have the following problem:

The Views Count is missing on modern communication pages in my SharePoint Online tenant.

views count missing

Has anyone else experienced this? It is happening on every page in every site especially News Posts.

Could it be that this is some security/compliance setting in M365?

database – Propogating db queries from a host that cannot initiate communication

We have jobs running on-premises, many of which directly query our (on-prem) database. At the start of these jobs a new record is created in the database, and the record id is returned so that it may be referenced in future queries. We’ve recently started running other jobs in the cloud, but we have yet to run jobs that require a database connection. Due to security constraints, communication between sites is restricted and we are only able to initiate pushes/pulls from on-prem.

What can we do to enable these jobs that need to propagate data to (and receive a response from) our on-prem database? Is a message queue an appropriate solution here (ie instead of querying the database directly, submit queries to a message queue in the cloud, pop off the queue from on-prem)? I don’t have much experience with databases and I have zero knowledge of message queues so when I looked into this I’m having trouble filtering for what’s relevant to this issue.

dnd 5e – Does the Ghostwise Halfling Silent Speech allow two-way communication?

The ghostwise halfling’s Silent Speech trait (SCAG, p. 110) says:

You can speak telepathically to any creature within 30 feet of you. The creature understands you only if the two of you share a language. You can speak telepathically in this way to one creature at a time.

The use of “speak to” rather than “speak/communicate with” seems to suggest that the telepathy is one way. Furthermore, the trait doesn’t describe any way for the creature to respond, and the subsequent sentences seem to reinforce this interpretation.

Rules designer Jeremy Crawford confirms this ruling in an unofficial tweet from September 2016:

Twitter user: Please, for the love of the Gods.. Can people speak back telepathically to a Ghost Wise Halfling using racial telepathy?

Crawford: The Silent Speech of the ghostwise halfling lets you telepathically talk to someone. It doesn’t enable replies.

(He also clarifies in response to another user that the ability can be used by a druid in Wild Shape.)

microservices – gRPC client – to – client communication between other Lan network

I have a question about gRPC communication.

I know gRPC has 4 models communication: unay, server-streaming, client-streaming and bi-direction. And the terms “client” and “server” very flexible, because it really is peer-to-peer communication.

I wonder “Can gRPC supports client-to-client communcation in case two or many clients locate in different LAN network”? Like image bellow:
enter image description here

For example, in MQTT protocol, two clients locate in different LAN network can communicate through topic in MQTT broker.

If pure gRPC can’t support this model, can I add other ingredient to make gRPC support this communication?

bugs – What does this error communication mean?

Few days ago, executing the command

Integrate( UnitBox((x + y)/eps - eps/3)/eps*UnitBox((z + y)/eps)/eps*
UnitBox((x + z)/eps)/eps, {x, -1, 1}, {y, -1, 1}, {z, -1, 1},
Assumptions -> eps > 0 && eps < 1/2)

, I obtained that communication

Mathematica has detected an internal error:
iCopyExpr() called on symbol.
Please report this error as soon as possible to
support@wolfram.com giving as many details as possible
of the circumstances under which it occurred.

enter image description here

I’d like to add that the command

Integrate(UnitBox((x + y)/eps)/eps*UnitBox((z + y)/eps)/eps* UnitBox((x + z)/eps)/eps, {x, -1, 1}, {y, -1, 1}, {z, -1, 1}, Assumptions -> eps > 0 && eps < 1/2)
results in
1/2 without any adventures and the command Integrate( DiracDelta(x + y)*DiracDelta(y + z)*DiracDelta(x + z), {y, -1, 1}, {x, -1, 1}, {z, -1, 1}) returns the input.

Of course, a report was immediately sent by me. I am able to reproduce it on a fresh kernel just now.
However, the questions remain open: what in general terms does this error mean? is it a feature of Windows 10 only?

dnd 5e – Can the Hexblood’s token be used for rudimentary two-way communication?

In the recent Gothic Lineage UA, the Hexblood race was introduced. One of their abilities is Magic Token:

Magic Token. As an action, you can harmlessly pull out one of your nails, a tooth, or a lock of hair. This token is imbued with magic until you finish a long rest. While the token is imbued in this way, you can use an action to send a telepathic message to the creature holding or carrying the token, as long as you are on the same plane of existence and are within 10 miles of it. The message can contain up to twenty-five words.

In addition, while you are within 10 miles of the token, you can use an action to enter a trance for 1 minute, during which you can see and hear from the token as if you were located where it is. While you are using your senses at the token’s location, you are blinded and deafened in regard to your own surroundings. Afterward, the token is harmlessly destroyed.

I want to ask if the following scenario is a viable use of this feature:

  1. Hexblood character A creates a token and gives it to character B.
  2. Later that day, A, as an action, sends a message to B. “Hey, in one minute, we do the thing.”
  3. Nine turns later, A uses his action to enter the trance, sending his awareness to the token, currently held by B.
  4. B starts speaking and/or shows something to the token, through which A sees and hears.
  5. A uses their subsequent nine actions to send rapid-fire twenty-five-word messages to B, who responds by speaking aloud.

While not ideal, this sounds like it would, once a long rest, with considerable setup, allow for two-way communication. Is there a reason it wouldn’t?

architecture – Direct communication between message-based bounded context

My project comprises of serveral bounded context which communicate with each other with RabbitMQ

The front end of the project is written in C# and the backend is in Java.

The RabbitMQ communication happens with JSON payload. The backend of the application defines these payloads as JSON-schema files that are used to autogenerate java classes. The same JSON-schema files are used for autogenerating CSharp files for the front end. RabbitMQ handlers are written on both sides(frontend and backend) to handle/reponse to payload queries.

The communication between frontend and backend needs to happen over RabbitMQ as both the applications run on different language platform.

Now, the bounded contexts defined in the backend also uses RabbitMQ to communicate with each other. This causes 2 problems

  1. the intercommunication between the bounded context may fail even having completely tested, as the bounded context are tested independently of each other.
  2. If there is a change, all the three things, publisher, JSON-schema and Consumer needs to be changed.

I want to develop a library which will bypass communication with RabbitMQ wherever possible and make a Java direct call between publisher and consumer just like any other library. The RabbitMQ call shall only be used in case direct call is not possible.

I need some suggestions as an headstart to start towards solving this problem.

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