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QUESTION
I have a generator object, that loads quite big amount of data and hogs the I/O of the system. The data is too big to fit into memory all at once, hence the use of generator. And I have a consumer that all of the CPU to process the data yielded by generator. It does not consume much of other resources. Is it possible to interleave these tasks using threads?
For example I'd guess it is possible to run the simplified code below in 11 seconds.
...ANSWER
Answered 2021-Jun-15 at 16:02Send your data to separate processes. I used concurrent.futures because I like the simple interface.
This runs in about 11 seconds on my computer.
QUESTION
I'm getting following error on some devices while opening url. I don't get any error on my devices but many devices are.
...ANSWER
Answered 2021-May-11 at 11:27A few notes on this issue:
Detecting non-browser apps as browsersThey query for browsers can detect non-browser applications, which will lead the an ActivityNotFoundException
when launching the Custom Tab. See this issue for an example.
When querying for packages that can handle browser intents, I recommend using the below:
QUESTION
As i title suggests, i want to know what is the best and simplest method to create window from ViewModel in MVVM pattern.
...ANSWER
Answered 2021-Jun-14 at 15:28i want to know what is the best and simplest method to create window from ViewModel in MVVM pattern
"The best", "the simplest" are very subjective concepts.
For some, a simple implementation may be considered difficult by someone.
This topic is very large, and for a detailed answer to such a question, you will need to write a thick textbook.
Therefore, in short, general concepts, and an example of a possible implementation.
From the ViewModel's point of view, it cannot "know" what a Window is. So asking the question "How should a VM create a Window?" - it is not correct.
The question should be asked like this: "How does the VM call an external dialogue?".
How this dialog will be implemented (WPF Window, Form or Console Input) for the VM does not matter.
A dialog is, in fact, a delegate to a method that returns a dialog result.
In the simplest case, the diaolog's result is just a bool (success / failure).
Let's say OpenFileDialog.ShowDialog returns Nullable
.
In more complex cases, an enumeration is returned. Sample MessageBox.
What kind of dialogue result you need depends on the conditions of your task.
Suppose if this is an element editing dialog, then it receives an element for editing in its parameters, and it can return bool: true - editing is completed and its results need to be saved, false - editing cancellation.
Gets the ViewModel delegate, usually at the time of its creation.
This is called dependency injection.
A typical place for Dependency Injection is App.
An example will link to your previous topic WPF MVVM binding command to Datacontext inside Datagrid
QUESTION
What is the simplest way to "afterpaypayovertime" key & value data from below object ?
...ANSWER
Answered 2021-Jun-14 at 07:24You can simply do something like this to get the desired results.
QUESTION
If I look at the pricing examples of running an Azure functions, versus running a virtual machine running those same functions, here is what I see on the Azure pricing site:
Running 3M functions each which takes one second and required 500MB of memory: $18.00 (invocations cost + computer cost)
Running 3M seconds on Azures cheapest virtual machine with at least 500MB of memory: (B1S instance, $0.008/hour): $6.67
I'm wondering if that comparison is fair in the simplest cases (where the functions are don't perform a lot of i/o, or use other Azure services) -- particularly whether whatever machine Azure uses to run Azure functions will run those same 3M functions at the same speed per function as the B1S Virutual machine instance? In other words, is the B1S instance as efficient per unit time as the Azure function running machines given the same memory requirements?
...ANSWER
Answered 2021-Jun-14 at 06:07You must look at your usage profile. Do the request come constantly at a steady rate? Or are they spread out?
With a virtual machine you pay for the time it is running, it is not dependent on what it is doing.
With an Azure function consumption plan you pay per request. So when there are no requests there is no charge.
https://azure.microsoft.com/en-us/pricing/details/functions/ (Your 18 USD comes from this page?)
When a function has 500 MB to use, your code can use all the memory. When a VM has 500 MB of RAM a significant portion is used by the operating system.
Edit: As Ken mentioned in the comment with a VM you need to look after the server, so you also need to take that cost into consideration.
The compute capacity is the same given a steady constant continuous use where you turn off the VM when the 3M calls are finished. But the VM has additional costs that also need to be taken into consideration.
Note when you turn the VM off you still pay for the storage of the disks.
QUESTION
ANSWER
Answered 2021-Jun-13 at 18:47In order to understand what's going on, I'll reformat the code a bit in order to make it more clear and explicit:
Your original code:
QUESTION
I'm just starting to delve into lua coroutines with C and I'm having a problem with what I think should be the simplest example I can come up with.
The C:
...ANSWER
Answered 2021-Jun-13 at 16:58lua_yield
is a C function, and C does not have a mechanism to magically jump back into a function that has halted. lua_yield
uses the C standard library longjmp
function to arbitrarily jump out of the function that called it. But it can't come back.
So what happens is that your C function yields, exiting the function and returning control to the Lua code that called coroutine.resume
. The resume was successful, so true
is printed. You then resume the coroutine again, which begins execution at the site in Lua code that called the C function that yielded. That code then exits the coroutine normally. Since the resume was also successful, true
is printed again.
But the coroutine is now exhausted and therefore cannot be resumed.
C functions don't have a clean way to be "resumed". Indeed, the Lua 5.1 documentation explicitly states:
This function should only be called as the return expression of a C function, as follows:
QUESTION
Story: in my java code i have a few ScheduledFuture's that i need to run everyday on specific time (15:00 for example), the only available thing that i have is database, my current application and openshift with multiple pods. I can't move this code out of my application and must run it from there.
Problem: ScheduledFuture works on every pod, but i need to run it only once a day. I have a few ideas, but i don't know how to implement them.
Idea #1: Set environment variable to specific pod, then i will be able to check if this variable exists (and its value), read it and run schedule task if required. I know that i have a risk of hovered pods, but that's better not to run scheduled task at all than to run it multiple times.
Idea #2: Determine a leader pod somehow, this seems to be a bad idea in my case since it always have "split-brain" problem.
Idea #3 (a bit offtopic): Create my own synchronization algorithm thru database. To be fair, it's the simplest way to me since i'm a programmer and not SRE. I understand that this is not the best one tho.
Idea #4 (a bit offtopic): Just use quartz schedule library. I personally don't really like that and would prefer one of the first two ideas (if i will able to implement them), but at the moment it seems like my only valid choice.
UPD. May be you have some other suggestions or a warning that i shouldn't ever do that?
...ANSWER
Answered 2021-May-30 at 11:20You can create cron job using openshift https://docs.openshift.com/container-platform/4.7/nodes/jobs/nodes-nodes-jobs.html and have this job trigger some endpoint in you application that will invoke your logic.
QUESTION
I need to reproduce a bug with OkHttp so I can file a bug or ask a question on StackOverflow.
What is the simplest way to do this without a lot of setup?
I've read https://stackoverflow.com/help/how-to-ask and https://stackoverflow.com/help/minimal-reproducible-example but I'm still stuck? Help me!
...ANSWER
Answered 2021-Feb-25 at 08:46Make a Kotlin script in Intellij, place it outside any source folders and make sure it ends with .main.kts
filename.
example.main.kts
QUESTION
I'm writing this piece of code where you start out with 1 penny and it doubles within every second for 30 seconds. The ultimate result is 107374182.4 million dollars. I did it the simplest way I know. I have recently started coding using Python 3. How can I simply this?
...ANSWER
Answered 2021-Jun-12 at 05:41use a loop (always remember-when writing code if some code repeats itself use a loop, or a function):
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