Requester | Enhances Akka with a safer alternative to ask
kandi X-RAY | Requester Summary
kandi X-RAY | Requester Summary
One of the most useful, and most fraught, functions in Akka is ask. On the one hand, it is invaluable for writing clear, understandable code -- after all, the pattern of "Send this message, and then do that with the result" makes loads of sense, and it's usually easy to see what the code is trying to do. On the other hand, ask is something of a landmine in practice, because it violates the most important invariant of Actors: there should never be code lexically inside of the Actor that doesn't run within the Actor's receive loop. ask returns a Future, and that Future will be run out-of-band, at some random time in the future. It can happen in parallel with running receive code, or not. There is lots of danger there, and it is easy to cause erratic, hard-to-reproduce bugs. (Not to mention the fact that sender probably won't be set to the value you expect during the response handler. One of the easiest Akka traps to fall into is using sender during a Future, which almost never works.).
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Requester Examples and Code Snippets
Lines of Code : 22
License : No License
Copyimport org.querki.requester._
class MyActor extends Actor with Requester {
... your usual code ...
}
case GetSpacesStatus(requester) => {
for {
ActiveThings(nConvs) <- conversations ? GetActiveThings
ActiveSessions(nSessions) < def receive = handleRequestResponse orElse {
case Start => {
persister.requestFor[LoadedState](LoadMe(myId)) foreach { currentState =>
setState(currentState)
unstashAll()
become(normalReceive)
}
}
case _ => def myPersist[T, U](evtIn:T)(handler:T => U):RequestM[U] = {
val rm = RequestM.prep[U]
persist(evtIn) { evt =>
val result = handler(evt)
rm.resolve(Success(result))
}
rm
}
Community Discussions
Trending Discussions on Requester
QUESTION
Small question regarding Spring Webflux, and how to "chain" http calls please.
With a concrete example, here is a very straightforward sample with Spring MVC, with a rest template.
...ANSWER
Answered 2021-Jun-14 at 13:54I have one big question here. While this is correct (it yields the same response) is this the correct thing to do?
Essentially, yes, you've done it correctly. The only things that aren't really correct there are your Webclient usage, and your style.
You certainly don't have to specify a WebClient per URI (and you shouldn't, they're meant to be reusable.) So if you have different domains and the same webclient, just create a standard instance:
QUESTION
I'm getting a bad gateway due to a timeout of 2 minutes but I don't now how to configure it, the following is what I have tried.
So, first of all, in python I'm setting a 120 second timeout (I don't want to change this, I've tried with 115 seconds and it works but I want to resolve the external timeout from IIS or waitress, I don't want to change this limit in my internal software).
...ANSWER
Answered 2021-Jun-11 at 09:36Finally solved by adding requestTimeout="00:05:00" in the httpPlatform tag of the web.config
QUESTION
It is a Medical Lab Software solution. A user makes lab investigation request that is unique to a patient’s encounter, I.e., a patient can have 1 or more request per encounter. This uniqueness is denoted by the encounter_id. The challenge now is the ability to send the results back to the requester.
I am able to display all requests per encounter_id on a template but unable to return the result since each result is tied to a particular investigation. This is largely because I have a limited knowledge on JS. My current approach can only submit one record, usually the last record
Here’s the URL that displays the result template: https://smart-care.herokuapp.com/labs/lab_results/1/
Here’s the django template:
...ANSWER
Answered 2021-Jun-10 at 09:27The problem that Django handles form elements based on name attribute and not the id attribute so this means you need to change name per request and on the view side you loop on all keys in request.POST like
QUESTION
We have requests / tickets coming across teams which are in different countries. And these requests are submitted through Google Forms. These requests / tickets are then picked at a single location and processed
There's a 5 hour non working window from 00:00 am to 5am. During this time as well we do get requests from the offices.
Is there a way if a form is submitted during this non workings hours an email notification goes to the requester letting them know that we are closed and the request submitted will be picked once we are open?
There is an option to run script. But i get an error.
If a script has to be run, how would that be possible based on the requirement?
Thanks
...ANSWER
Answered 2021-Jun-09 at 15:29You can use the onFormSubmit trigger for spreadsheets. It provides all of the information for each submission via namedValues which is an object or values which is an array. As an installable trigger it is capable of performing operations that require permission like sending emails.
There are many examples of doing this on this site.
QUESTION
I'd like to get Tweets using the v2 full archive search. I don't understand the error I got from the code below. Did I request too many times?
Here's config.py
...ANSWER
Answered 2021-Jun-09 at 10:47Please upgrade your package and retry or contact Twitter about enterprise access.
Check api page in twitter
QUESTION
I'm trying to deploy a new version of an already existing Azure Function using the cli using the following command:
...ANSWER
Answered 2021-Jun-08 at 16:23As suggested in the comment by @Marco, the correct option is --debug
QUESTION
I'm new to working with FHIR and need help with parsing a FHIR-Bundle (xml) in C#. I'm able to get the URL of the patient- or organization-resource from the composition-resource in the bundle, but need to store the values of the resources (e.g. name of patient) into variables to work with them, e.g. store them to an SQL database. Can you help me please? Thx in advance!
...ANSWER
Answered 2021-Jun-03 at 15:23You could do the following:
QUESTION
Following this tutorial: https://www.usgs.gov/media/files/landsat-cloud-direct-access-requester-pays-tutorial
...ANSWER
Answered 2021-Jun-03 at 01:54This worked for me
QUESTION
I am making a bot on discord.JS that creates a JSON database with a few values. How do I make it, so instead of completely overwriting the whole JSON, the code just edits the specified object?
...ANSWER
Answered 2021-Mar-13 at 03:26Instead of overwriting the JSON Object with
QUESTION
I'm writing an API that is hidden behind Azure's API Management tool. It can't be accessed unless APIM verifies the requester's access token as well as Azure subscription. In the API, we want to verify with the requester that we will only accept zip files.
...ANSWER
Answered 2021-May-28 at 17:42Content-Type is a way for a client to indicate for the server what content you wish to send. Of course you might maliciously "lie" about it, but it would be against your own interest as a client. Servers might implement appropriate logics to parse file content, depending on the Content-Type header.
There are several things to consider:
- A server is expected to work properly, only if the client sends valid data: i.e.: clients that want the server behave properly should not lie about the real Content-Type of uploaded files.
- It is easier for servers to check a Content-Type header, compared to specifying file types using other methods.
- Servers should also validate data and mitigate risks in case of possible misuse of an API. For example, in your case, you should add try-catch around unzipping content, and respond with error if unzipping was not successful.
For your other question, whether real Content-Types can be checked, the answer is generally: no. There are some file types, where the file itself contains some kind of "magic string" that can be used as a signiture for that Content-Type.
You can check some of these common file signitures: https://en.wikipedia.org/wiki/List_of_file_signatures
Please note that, a malicious user might be able to modify file signatures as well. There can be additional security measures to defend against spoofing file contents, e.g.: checksums, but there is no 100% security, unless some private secret is shared among servers and trusted clients, which can be used to securely sign contents.
The real question here is: why would anyone maliciously spoof Content-Types? Or file contents? And what level of security measure is needed to avoid associated risks?
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