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caching – Fast sliding cache counter

We have an email system that handles incoming and outgoing emails, the risk is that we get so called feedback loops, a bounce email is answered with another bounce etc. We have safeguards in place to handle this, but I need a last line of defense.

I want to keep a cache that keeps track of per email how often it was sent in the last 5 minutes, if it goes over a certain threshold nothing is sent and a log entry is generated.

But we handle a few 1000 emails an hour so I want this lookup to be fairly fast.

What I was thinking is to use a dictionary where the key is the email address and the value is a list of dates. Every minute a scheduled task will purge this dictionary.

Pros: Its very fast to check how many emails are sent in the last 5 hours, just the length of the list of the dictionary key for that email.
Cons: cleaning is expensive, the list would have to be locked and every item has to be inspected.

Is there a good way to utilize such a caching mechanism?

plugins – How to fix caching issue in PHP data from database

Im trying to use the code belong for my plugin development but there is a caching issue (I think). Please below for the details.


I created filter to accept the customized url, and I’m querying the database but it seams like the result value is not changing in the browser but changing in the database. So basically the data passed is not returning the updated value from the database.


add_action( 'init',  function() {
    add_rewrite_rule('coupon/((a-zA-Z0-9)+)(/)?$', 'index.php?coupon=$matches(1)', 'top');

add_filter('query_vars', function( $query_vars ) {
    $query_vars() = 'coupon';
    return $query_vars;

add_action( 'template_include', function( $template ) {
    if ( get_query_var( 'coupon' ) == false || get_query_var( 'coupon' ) == '' ) {
        return $template;


    // Check if coupon exists
    global $wpdb;
    $coupon = get_query_var('coupon');

    $coupon_query = $wpdb->prepare('SELECT * FROM wp_urls WHERE coupon = %s AND claimed_at IS NULL', $coupon);
    $coupon_available = $wpdb->query($coupon_query) ? true : false;

    if(!$coupon_available) {
        header('Location: /'); // Redirect to landing page
    return plugin_dir_path(__FILE__) . 'views/client/index.php';;
} );

Expected Result

The expected result should redirect the user to the header('Location: /'); if the coupon is not available.

Any idea?

caching – Azure Policies – Redis Cache preview feature private endpoints

Writing a policy for Azure Redis Cache, for private endpoints, seems the aliases are not available for querying even though they are listed when running an get-azpolicyalias command. Is this because the private endpoints feature is still under review? Neither approach below is working.

      "if": {
          "allOf": (
                  "field": "type",
                  "equals": "Microsoft.Cache/redis"
      "then": {
          "details": {
              "type": "Microsoft.Cache/redis/privateEndpointConnections",
              "existenceCondition": {
                  "field": "Microsoft.Cache/redis/privateEndpointConnections/privateEndpoint.id",
                  "exists": "true"
          "effect": "(parameters('effect'))"


        "if": {
            "allOf": (
                    "field": "type",
                    "equals": "Microsoft.Cache/redis"
                    "field": "Microsoft.Cache/redis/privateEndpointConnections/privateEndpoint.id",
                    "notContains": "/privateEndpointConnections/"
        "then": {
            "effect": "(parameters('effect'))"

Thanks for any help you may provide.

memory – Is there a way to set the disk caching behavior on macOS?

I have an 8GB RAM MacBook Pro that struggles under my workload and I regularly have yellow memory pressure. I do notice that during these times, the disk caching (i.e. ‘Cached Files’) is taking up ~1GB of RAM. Though I am well aware that files in RAM is much faster than if it has to pull it off the disk, the machine DOES have a pretty fast SSD and I’d be willing to have less disk cache in favor of more application RAM.

Is there a way to set the amount of memory (or behavior rules) around how the OS utilizes disk caching? I’m a bit surprised that when memory pressure gets bad, it still insists on using a good chunk of my RAM to cache instead of at least cutting that in half.

caching – Drupal 8.9 site redirecting to core/install.php post-installation

I’ve just started getting this redirection issue on a Drupal 8.9 site that has existed for a while where any request keeps getting redirected to the core.install.php file, which subsequently tells me the site is already installed. Clicking on the ‘view existing site’ link just loops back to the install page.

Work was being done directly on this website, so it had local config changes. I copied the DB down to my local, exported all new changes to code config using drush and redeployed as usual. That’s when this redirection issue started. there are no logs in apache’s error log that are related.

I appreciate the description is vague, but I’m just looking for any tips or anyone who’s experienced something similar.

algorithms – Optimal order to traverse a grid with caching

Let’s say I want to evaluate a two-argument function using all possible combinations of elements from sets A and B as arguments.

For example, if the function is addition, we get this grid:


     1 2 3 
   1 2 3 4
B  2 3 4 5
   3 4 5 6

Let’s also say that retrieving an element from a set is has a fixed cost, but we can remember up to N elements at a time.

Is there a known optimal order in which to consider the elements, in terms of cost?

For example, we could start with the first element of A, then consider every element of B. If the size of B is much larger than N then every new element of B will be a “cache” miss, making this a not very efficien strategy.

caching – How to – drupal 9 php.ini opcache path for multiple websites with shared code base

I have a D9 website set up already and I want to add another that shares the same code base. (This is on a shared hosting environment)

Below is an example my current php.ini settings for the opcache with ‘MyWebSite1.com’ as the initial website cache directory path. I want to have the two sites cached in different directories.

How do I specify the path in this php.ini set up for the second ‘MyWebSite2.com’ website? Or, does this cache directory contain generic php info that can be shared between multiple sites so that only one directory can be specified?

Thank you.

date.timezone = 'America/City'


architecture – What is the proper way to handle Oauth Token caching in .Net Web API

When using RestFul web api in my app I have a requirement to handle token caching so that on the authorization(api side) It only needs to send this access token to the validation server once per hour or whenever the expiration is set at. The other subsequent calls up to that hour mark would see that it has been already validated and can allow the call to continue

So what is the correct flow for handling this type of caching?

Client gets Access Token on their side with their Id and Secret ->

Bearer AT is passed in header to my api and I validate it once ->

Api call is made and response is sent back along with AT and a Validated boolean value as true??? ->

All other client calls made to the api will attach Access Token and Bool Value in the header??? ->

Api reads bool value as true and allows passage???

This doesn’t seem the right way to handle it to me. So what is the proper way?

How does magento product image caching works?

I uploaded some images to my products and they were visible fine on frontend. I then went and deleted those images from pub/media/catalog/product folder and also deleted pub/media/catalog/product/cache folder. When I open the media cache link of product I now see the default placeholder image. The path I use in my browser is media/catalog/product/cache/ca230af9a56e172d8d63e4842d175bbe/k/a/kars.jpg This is no way the path for the placeholder image. So now the question is:

  1. How is magento replacing the deleted image with placeholder image, instead of showing 404?
  2. How is the path not showing 404 since I had deleted those folders?

Thank you for your help.