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I was developing an game. I using single threaded nodejs(socket.io) server. It is good for simple games or games like basic 3d world? Usually game will have 10-20 players(clients).
Also is single threaded server can handle multiple clients same time?
like player 1 walks player 2 jumps same time.
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This is regarding a marketplace in WooCommerce that has different vendors. Let’s say you are buying item A from Vendor 1 and item B from Vendor 2. And you would like to get the first item shipped to your home, but you want to pick up Item B, since it’s close to your home. Is it possible to checkout on a single order choosing a shipping method for item A and a different one for item B?
Thanks!
I have a controller that receives some REQUEST parameters. These are forwarded to an importer service class. The importer then connects to a remote REST api which in turn will respond with a list of resources.
Each resource must then be scanned for the existence of a certain property, and if it is present, a new request must be sent to the Api, using the value of that property. Finally, those resources will be persisted in a repository.
If my service connects to the api, scans the response object and sends a new request all at once, then it most likely violates SRP. I could move some parts of it into the domain layer. But I don’t think the algorithm that processes the api response is a domain concern, it’s more of a detail of the implementation.
So, should I create one service to send requests, and another to process the response? Or is it okay to create several methods within the same service?
Consider the problem
$$max_x x^top B x$$
subject to $|x|=1$ and $b^top x = a$, where $b$ is a unit vector but not necessarily an eigenvector of $b$. Suppose that $B$ is positive definite with eigenvalues $lambda_1 geq lambda_2 geq … geq lambda_n > 0$.
If $a = 0$, the optimal value is bounded below by $lambda_2$ by the Courant-Fischer theorem (as was pointed out to me by @Omnomnomnom on Stack Exchange), and will be tight if $b$ is the principal eigenvector. Suppose, however, that $a > 0$ is a small, but strictly positive number. My conjecture is that, in this case, a tight lower bound should be $a^2 lambda_1 + (1-a^2)lambda_2$. I got this idea by taking $b$ to be an eigenvector of $B$ with $a leq frac{1}{sqrt{2}}$.
Any feasible $x$ can be written as $ab + sqrt{1-a^2}cdot hat{b}$, where $hat{b}$ is orthogonal to $b$. Thus, the problem still boils down to selecting a unit vector $hat{b}$ from the orthogonal complement of $b$, but with a different objective
$$max_{hat{b}} left(ab+sqrt{1-a^2}cdothat{b}right)^top B left(ab+sqrt{1-a^2}cdothat{b}right)$$
Since this objective includes the term $left(1-a^2right)hat{b}^top B hat{b}$, I think the lower bound should include a term $left(1-a^2right)lambda_2$ by analogy with the case $a=0$. Unfortunately I am having trouble showing that the first term can always be as high as $a^2 lambda_1$. One way to approach this is by constructing one particular $hat{b}$ for which the lower bound always holds, since then it automatically applies to the maximum over all $hat{b}$. Some sensible choices of $hat{b}$ could be the orthogonal projection of the eigenvectors of $B$ onto the orthogonal complement of $b$ (the idea being that you would like to go in the direction of the principal eigenvector), or taking $B^{frac{1}{2}}hat{b}$ to be the orthogonal projection of $B^{frac{1}{2}}b$ onto $b^{perp}$ (to try to maximize the cross term in the objective), but I haven’t been able to show the bound for any of these.
Perhaps my intuition is wrong and the bound simply does not hold, but I am just wondering if anyone might have any thoughts on this, or if this problem has already been studied.
We are exporting a list of products from Magento 1.9 using a Dataflow Profiles export.
The resulting export file includes multiple rows for each product if the product has more than one image (eg if the product has 3 images there will be 3 rows for the product in the resulting CSV file).
We would like to have just a single row per product regardless of the number of images for each product.
I assume this can be done by adding some XML to the “Actions XML” field.
How can we force the export to only generate a single line for each product (always just the first line if there is more than one line per product)?
Im very puzzled about this issue.. I have a SQL Server database with many records and it is used by my website. When the website user searches for a specific record, the SQL command gets a timeout. The only thing that is different between searches is the parameter.
Everything works within SQL Management Studio. Using newest version of SQL Server Express on a Windows Server 2016.
This fails with a timeout:
Query: SELECT * FROM dbo.v_MyView WHERE 1=@ONE AND Name LIKE @name Order by dbo.v_MyView.Date Desc OFFSET (0) ROWS FETCH NEXT (10) ROWS ONLY
Parameters: @ONE 1, @name flop%
This works:
Query: SELECT * FROM dbo.v_MyView WHERE 1=@ONE AND Name LIKE @name Order by dbo.v_MyView.Date Desc OFFSET (0) ROWS FETCH NEXT (10) ROWS ONLY
Parameters: @ONE 1, @name bandit%
Notice that it is only the content of the parameter @name that changes. searching for “flop%” fails and searching for “bandit%” works.
I’ve created a CSV feed via Views Export that exports out data for a content type. I’m then using Feeds to import that onto another Drupal site.
Everything except the images are working, when I run import it’s stating
Failed importing 2 RSS Item items.
The content failed to validate with the following errors:
Image (field_image): Image: this field cannot hold more than 1 values.
Please check your mappings.
The field in question on Site A has a single limited value of 1, and checking the CSV export it’s only showing one value, the absolute url of the image on Site A.
I’ve attempted to use Feeds Tamper and use all the plugins I can think of to fix this, but due to my freshness to Feeds and Feeds Tamper I’m not sure if this is a bug or misconfig on my part. Everything else is importing as expected onto Site B.
How can I get the import running successfully?
I’ve created a CSV feed via Views Export that exports out data for a content type. I’m then using Feeds to import that onto another Drupal site.
Everything except the images are working, when I run import it’s stating
Failed importing 2 RSS Item items.
The content failed to validate with the following errors:
Image (field_image): Image: this field cannot hold more than 1 values.
Please check your mappings.
The field in question on Site A has a single limited value of 1, and checking the CSV export it’s only showing one value, the absolute url of the image on Site A.
I’ve attempted to use Feeds Tamper and use all the plugins I can think of to fix this, but due to my freshness to Feeds and Feeds Tamper I’m not sure if this is a bug or misconfig on my part. Everything else is importing as expected onto Site B.
Any assistance would be much appreciated. Thanks!
How can I display only the specific category when accessing the posts related to that category? For example, I want to show only CSR Events under Categories When accessing posts related to CSR events. Here’s the link to CSR post https://www.mi-eq.com/blood-donation-compaign/
Screenshot: https://i.stack.imgur.com/YoTfk.jpg
Similarly, when visiting posts related to other categories, only the specific category will be shown.