I check async write with following code.
BOOL bOk = ::GetOverlappedResult(hFile, pOverlapped, dwBytesTransferred, TRUE);
if ( FALSE == bOk )
{
TRACE_ERROR_NO_ASSERT(GetOverlappedResult);
}
bOk is TRUE, but dwBytesTransferred is 0, and pOverlapped->Internal is 258(timeout).
my questionn is : is my async operation timeout and will be finished later? or just failed? should I call CancelIo to cancel this timeout operation like this?
BOOL bOk = ::GetOverlappedResult(hFile, pOverlapped, dwBytesTransferred, TRUE);
if ( FALSE == bOk )
{
TRACE_ERROR_NO_ASSERT(GetOverlappedResult);
return FALSE;
}
if ( 0 == dwBytesTransferred )
{
CancelIoEx(hFile, pOverlapped); // is this neccessary?
}
I refer the MSDN document, but no description for this condition.
thanks in advance.
your operation is finished (failed) with STATUS_TIMEOUT - this is final status and operation complete. you not need and can not cancel it - it finished. that GetOverlappedResult return TRUE and not set error code - this is only bad (I be say error) design of this win32 api. it unconditionally return TRUE and not set last error if (0 <= status). as result it wrong process STATUS_TIMEOUT (I think you worked with serial (com) port).
so formal answer:
your operation finished.
you should not call CancelIo
however i think that use GetOverlappedResult for asynchronous i/o at all no sense. need use apc or iocp completion.
Related
I would like to call an external graphql API (without authentication for the moment).
Here is my code :
local open_api = "https://graphqlzero.almansi.me/api"
local payload = '{"query": "query { post(id: 1) { id title body }}"}'
local headers = {
}
local function craftCall()
local response
local data
pcall(function ()
response = HttpService:PostAsync(open_api, payload, Enum.HttpContentType.ApplicationJson, false, headers)
data = HttpService:JSONDecode(response)
end)
if not data then return false end
print(data)
return false
end
if craftCall() then
print("Success")
else
print("Something went wrong")
end
I get always something went wrong. I need some help on what is going wrong... Specially I don't know if am I correctly formatting the Payload.
After your http call, you never return a success result. You've only outlined failure cases :
if not data then return false end
print(data)
return false
So your conditional, if craftCall() then always evaluates to false.
Why not make it return true or data after the print(data)? Then you'll know that it made it to the end of the call successfully.
local function craftCall()
local success, result = pcall(function()
local response = HttpService:PostAsync(open_api, payload, Enum.HttpContentType.ApplicationJson, false, headers)
return HttpService:JSONDecode(response)
end)
if not success then
warn("PostAsync failed with error : ", result)
return false
end
-- return the parsed data
return result
end
I want to use workMager to do some work every 15min,at the same time I want to stop workManger when I clicked on the button "StopThread" below is my Code:
val workManager = WorkManager.getInstance(applicationContext)
val workRequest = PeriodicWorkRequest.Builder(
RandomNumberGeneratorWorker::class.java,
15,
TimeUnit.MINUTES
).addTag("API_Worker")
.build()
binding.buttonThreadStarter.setOnClickListener {
workManager.enqueue(workRequest)
}
binding.buttonStopthread.setOnClickListener {
workManager.cancelAllWorkByTag("API_Worker")
}
And this is the RandomNumberGeneratorWorker
class RandomNumberGeneratorWorker(
context: Context,
params: WorkerParameters
) :
Worker(context, params) {
private val MIN = 0
private val MAX = 100
private var mRandomNumber = 0
override fun doWork(): Result {
Log.d("worker_info","Job Started")
startRandomNumberGenerator();
return Result.success();
}
override fun onStopped() {
super.onStopped()
Log.i("worker_info", "Worker has been cancelled")
}
private fun startRandomNumberGenerator() {
Log.d("worker_info","startRandomNumberGenerator triggered")
var i = 0
while (i < 100 && !isStopped) {
try {
Thread.sleep(1000)
mRandomNumber = (Math.random() * (MAX - MIN + 1)).toInt() + MIN
Log.i(
"worker_info",
"Thread id: " + Thread.currentThread().id + ", Random Number: " + mRandomNumber
)
i++
} catch (e: InterruptedException) {
Log.i("worker_info", "Thread Interrupted")
}
}
}
}
The issue that I'm facing is when I stopped the workManger it didn't work again when I clicked on buttonThreadStarter
I did a little research and I found that I can start-stop-start..etc workManger with the code below :
val workRequest = OneTimeWorkRequest.from(RandomNumberGeneratorWorker::class.java)
binding.buttonThreadStarter.setOnClickListener {
workManager.beginUniqueWork("WorkerName",ExistingWorkPolicy.REPLACE,workRequest)
}
binding.buttonStopthread.setOnClickListener {
workManager.cancelAllWork()
}
but as you can see it's working when I used OneTimeWorkRequest and with that, I can't repeat the work every 15 mins , Any suggestion in how to resolve this issue
WorkManager is not designed for periodic works with exact timing. In reality, the works "are not even periodic".
As you can see here from the logs:
https://developer.android.com/topic/libraries/architecture/workmanager/how-to/debugging#use-alb-shell0dumpsys-jobscheduler
WorkManager delegates to the JobScheduler. JS jobs work in a way that you have a number of explicit(you set them) and implicit(set by the system) constraints and after all of them are satisfied - the job starts.
When you have a period there is an extra constraint - TIMING_DELAY. So if your 15min pass - this doesn't mean in no way that the job will be executed. There might be, and be sure that there will be other constraints. That is the case because WM is designed for resource optimization and it will ensure that the work will finish at some point, even on device restart. But it is not designed to be exact. It is quite the opposite.
And after all the constraints are satisfied - it might take a day, the job is no longer needed and a new job is created with again your 15min constraint - TIMING_DELAY. And the process starts again.
Also - when you say "doesn't trigger" - please, check why. Try to check the debug output from the JS and see if there is work at all. If there is - check what constraints are not satisfied.
But long story short - "every 15min" is not something for WorkManager. Normally you should use AlaramManager for exact timing, but with such a short interval you should try to consider using a Service.
Also, it is dangerous to call: cancelAllWork(). You might break the code of some library in your app. You should better use tags and cancel by tag.
I have a request where i get Processing or Submitted in a response parameter if the request is in process or passed respectively.
I am able to poll and get if the status is "Processing" or"Submitted" but after that I am unable to fail the request if still i am not getting the expected status after polling for 5 times.
How can i fail request after certain retries do not provide me expected response?
The answer is in your question,
I assume you are polling using a js function,
If so you can add a boolean return from that, if you condition not met return false or if condition met return true then assert the value returned from your feature file.
* def pollingFunc =
"""
function(x) {
// your polling logic which retrives status
if (status == x) {
return true;
}
else{
return false;
}
}
"""
In feature
* def statusFound = pollingFunc("Processed" )
* assert (statusFound == true)
If the expected status not obtained after polling the assert will fail the test
I have implemented Redis's reliable queue pattern using BRPOPLPUSH because I want to avoid polling.
However this results in a network request for each item. How can I augment this so that a worker BRPOPLPUSH'es multiple entries at once?
While BRPOPLPUSH is blocking version of RPOPLSPUSH and do not support transactions and you cant handle multiple entries. Also you cant use LUA for this purposes because of LUA execution nature: server would be blocked for new requests before LUA script has finished.
You can use application side logic to resolve queue pattern you need. Pseudo language
func MyBRPOPLPUSH(source, dest, maxItems = 1, timeOutTime = 0) {
items = []
timeOut = time() + timeOutTime
while ((timeOut > 0 && time() < timeOut) || items.count < maxItems) {
item = redis.RPOPLSPUSH(source, dest)
if (item == nil) {
sleep(someTimeHere);
continue;
}
items.add(item)
}
it is very first time i'm messing with sockets , and read many quotes that this is not for newbies.
so problem is i'm using php smpp library for sending SMS which works fine but after delivering two to three SMS delivery fails with following warning
Warning: stream_socket_sendto() [function.stream-socket-sendto]: An existing connection was forcibly closed by the remote host', and to make it work again i need to restart` apache.
Following is write function which throwing exception
public function write($buf) {
$null = null;
$write = array($this->handle_);
// keep writing until all the data has been written
while (strlen($buf) > 0) {
// wait for stream to become available for writing
$writable = #stream_select($null, $write, $null, $this->sendTimeoutSec_, $this->sendTimeoutUsec_);
if ($writable > 0) {
// write buffer to stream
$written = stream_socket_sendto($this->handle_, $buf);
if ($written === -1 || $written === false) {
throw new TTransportException('TSocket: Could not write '.$written.' bytes '.
$this->host_.':'.$this->port_);
}
// determine how much of the buffer is left to write
$buf = substr($buf, $written);
} else if ($writable === 0) {
throw new TTransportException('TSocket: timed out writing '.strlen($buf).' bytes from '.
$this->host_.':'.$this->port_);
} else {
throw new TTransportException('TSocket: Could not write '.strlen($buf).' bytes '.
$this->host_.':'.$this->port_);
}
}
}
Please anyone can put some light
It was the bug which i won't able to identify/ rectify. then i used an other library from http://www.codeforge.com/read/171085/smpp.php__html and it really saved me.