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Why do we need message brokers like RabbitMQ over a database like PostgreSQL?
...ay no longer require an external queueing system since it's now simple to fetch 'n' rows that no other session has locked, and keep them locked until you commit confirmation that the work is done. It even works with two-phase transactions for when external co-ordination is required.
External queuei...
Spinlock versus Semaphore
...data, and finally modifies a shared reference (append data to a container, etc.) before releasing the lock. Instead, one would acquire the lock only for the purpose of accessing the shared resource.
Since this means that there is considerably more work outside the critical section than inside it, na...
Entity Framework: One Database, Multiple DbContexts. Is this a bad idea? [closed]
...example shared entity types and their passing from one context to another, etc. Generally it is possible, it can make your design much cleaner and separate different functional areas but it has its costs in additional complexity.
...
Use 'import module' or 'from module import'?
...module
and then access everything as
module.function
module.modulevar
etc. The reason is that at the same time you have short invocation, and you clearly define the module namespace of each routine, something that is very useful if you have to search for usage of a given module in your source.
...
When should the volatile keyword be used in C#?
... always access the current value of the field (it might be from the stack, etc). Marking a field as volatile ensures that the current value of the field is accessed by the instruction. This is useful when the value can be modified (in a non-locking scenario) by a concurrent thread in your program or...
GUI not working after rewriting to MVC
...SING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(color);
g2d.fillOval(x, y, size, size);
}
@Override
public int getIconWidth() {
return size;
}
@Override
public int getIconHeight() {
...
Difference between git pull and git pull --rebase
...
git pull = git fetch + git merge against tracking upstream branch
git pull --rebase = git fetch + git rebase against tracking upstream branch
If you want to know how git merge and git rebase differ, read this.
...
ASP.Net MVC Html.HiddenFor with wrong value
...tep.
Data and/or Errors from "Step 1" would become mixed up with "Step 2", etc, until I finally realized that ModelState was to 'blame'.
This was my simple solution:
if (oldPageIndex != newPageIndex)
{
ModelState.Clear(); // <-- solution
}
return View(model[newPageIndex]);
...
How do I use WPF bindings with RelativeSource?
... This makes sense, given that you can do relative bindings to width/height/etc. of a control.
– DrEsperanto
Nov 13 '18 at 18:37
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show 4 mor...
HTML 5 tag vs Flash video. What are the pros and cons?
...rlier, and other downlevel clients (like older versions of FF/Safari/Opera/etc), just put your standard video embed code inside the <video> tag, below the <source> elements. If the browser supports <video>, it'll ignore the embed. If it doesn't, it'll ignore the <video> and...