node.js – Event-based communication between microdevices

I am currently looking for NestJS to use as a framework for a new ecommerce project. The goal is to create several loosely coupled services that can communicate with each other using the pub / sub messaging pattern. NestJS offers some great out-of-the-box integrations with tools like Redis, NATS and RabbitMQ. I have read that Kafka is also supported, but that is not yet properly documented.

The problem I have is decision making. After reading a lot of material about event-based systems and how they work, I still don't know exactly which tool to choose.


1) I think I need a news broker who can queue messages to make sure that they (possibly) are delivered to subscribers.

That's because I may have one CatalogueService the events like product_created, Services like a CartService and OrderService should also contain a copy of the product data and these products should be up to date. I can't afford to have old prices OrderService there would be the price calculations. If a service fails, it can be restarted and properly process unprocessed messages in the queue.

2) I think I need a message broker that supports first in, first out (FIFO) queues.

That's because I may have two product_edited Events that should be processed in the correct order to avoid corrupted data. If a store manager changes a product price twice, the latter price should be considered the most current.


I used the words "I think" before the two requirements because I am not 100% sure that my thinking is correct. Therefore I am curious about what your thoughts and experiences are. Any tips, tricks, or advice would be highly appreciated!

mac os x – 2013 – No connection to the MySQL server when & # 39; reading the initial communication package & # 39 ;, System error: 0 "Internal error / verification (no system error)"

I have this user in MySQL

+------------------+-----------+
| User             | Host      |
+------------------+-----------+
| debian-sys-maint | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| root             | localhost |
+------------------+-----------+

I want to connect remotely from my Mac using SSH

I can not connect. I got on

2013 – Broken connection to the MySQL server while & # 39; reading the initial communication package & # 39;, system error: 0 "Internal error / verification (no system error)"

I know if I added this record below

| root             | % |

I will be able to connect, but it does not seem to be very safe to do so.

I thought we could connect to our database via SSH.

Please correct me for what I did wrong.

sharepoint online – Can I restrict access to website pages in the communication site in any way?

I need to enable the option to control permission for users to post content. For example: In the announcement area, only the marketing and IT department should have access to the publication of content. In the HR area, only the HR department should have access to the publication of content. How can I deal with moving all news items to the Site Pages library? Is there an alternative way to do this?

ESET Internet Security blocks GSA SER communication

Regardless of whether the GSA SER is whitelisted in ESET applications, my ESET is still reporting malicious connectivity – see the attached image. This probably shows the check of the current version, but when I use the proxy scraper, it often detects the connection to the bing.com portal as a Coin-Miner.JS threat.

If this activity doesn't hurt, I can create the rule within. However, I am fairly certain that contacting ESET with a request to reevaluate the activity sorting is considered to be inadmissible on your part.

Any idea?

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,

Architecture – events for communication between game objects in a component-based system?

I plan to implement a small, simple "game engine" with game objects, their components and so on. My problem is how do they communicate with each other?

I understand that event-based communication is popular, but how does it work in practice?
Suppose I'm doing a platformer shooter, and the player needs to know about every platform, enemy, bullet, and frame. What will the events look like? I thought the player should just say, "Hey scene manager, I need to know something about the platforms. Is there a chance you will give me a hint?" and then the player can just handle it. In general, the addresses of the platforms (or any other game object) shouldn't change that much, so I'm back in a situation where everyone knows about everyone else … In this case, events seem to be useless.

How are events used in practice for communication between objects? Is my example the same as what is done in games? If not, what do games do instead?

SharePoint Online 2019 communication website / tabs

I am a librarian and I am responsible for creating a SharePoint website for our college staff and students. The website is SharePoint Online 2019 and a communication site.

Tabs (four) must be inserted within a site page and web parts such as quick links or images must be added. The tabs contain resources for the topic overview, which we cannot accommodate on a site page, as this leads to a too large scrolling.

I am a beginner with minimal programming experience. Can you tell me if this is possible with the type of site I'm working with and the layout I'm trying to create? And how would I do it?

Thank you for any input you offered.

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Distributed computing – do persistent / transient communication and temporal decoupling / coupling mean the same thing?

In Distributed Systems by Tanenbaum it says on page 67

CHAPTER 2. ARCHITECTURES

2.1. ARCHITECTURAL STYLES

Cabri et al. (2000) provide a taxonomy of coordination models that can
equally applicable to many types of distributed systems. Light
We differentiate models according to their terminology
two different dimensions, temporal and referential, as shown in figure
2.9.

Enter image description here

If processes are linked temporally and referentially, coordination
takes place in a direct way, referred to as direct coordination. The referential
Coupling usually occurs in the form of explicit references
Cation. For example, a process can only communicate if it knows the name
or identifier of the other processes with which information is to be exchanged.
Temporal coupling means that processes that communicate do both
must be ready for use. Talking about cell phones in real life (and assuming
that a cell phone has only one owner) is an example of direct communication.

Another type of coordination occurs when there are processes chronologically
decoupled
but referentially coupled, what we as a mailbox coordinator
tion. In this case, there is no need for two communication processes
Execute simultaneously so that communication can take place. Instead,
Communication takes place by inserting messages into a (possibly shared) mailbox.
Box. Because it is necessary to explicitly address the mailbox to be held
There is a referential coupling for the messages that are to be exchanged.

S172 says

CHAPTER 4. COMMUNICATION

4.1. FOUNDATIONS

Types of communication

An email system is a typical example of communication
is persistent. With constant communication, a message that has been
The data submitted for transmission is stored by the communication middleware
as long as it takes to deliver it to the recipient. In this case it is
Middleware stores the message in one or more memories
Devices according to Figure 4.4. As a result, it is not necessary
So that the sending application after sending the
Embassy. Likewise, the receiving application does not have to be running
when the message is sent.

In contrast to temporarily
communication
the communication system only stores a message as
as long as the sending and receiving application are running. More
Exactly as shown in Figure 4.4 if the middleware cannot

Do constant communication and decoupling mean the same thing? What are their relationships and differences?

Do transient communication and temporal coupling mean the same thing? What are their relationships and differences?

Many thanks.