c++ - Managing asynchronous communication: how to examine response received in another thread -


i have dispatcher thread , listener thread. when dispatch command, want wait response before send follow command. need examine respond before can proceed 2nd command, least of confirm response received , okay. pseudo code below:

void mainwindow::downloaddata() {     dispatcher->getinfo(); // sends command      // qstring response = receiver->response() // idealy check response since async, can't that!      dipatcher->askdata(); // 2nd command , forth  }

is there elegant way solve issue? way can think of if use same thread , calls blocking that's not solution.

in qt, use signals , slots connect them in cascading manner when first signal triggered initiates whole sequence of operation (each slot emitting new signal) seems rather dirty well.

one of robust ways handle asynchronous events , process chains/graphs of actions upon these events fsms. qt provides basis implementing fsms qt-state machine framework. i'd suggest go way. unfortunately examples provided qt fsm dealing guis , animations.

the advantage of fsm approach is, fsms can represented both graphs , tables. first option great understanding, second validation, there no endless loops , "dead" ends.

i've built on basis of qt-fsm framework own framework defining fsms in domain specific language. use controlling complex machine having couple of sensors actors working asynchronously. using dsl helps me implement in higher abstraction - in abstraction level of fsm-graphs.


Comments

Post a Comment

Popular posts from this blog

powershell Start-Process exit code -1073741502 when used with Credential from a windows service environment -

i'm running strange behavior powershell start-process call. here call: $process = start-process ` "c:\somepath\mybinary.exe" ` -passthru ` -credential $defaultcredential ` -wait ` -workingdirectory "c:\somepath" ` -loaduserprofile if ($process.exitcode -ne 0) { #do } this call return exit code - 1073741502 . after quick search, exit code seems related generic error when program not load required dll (aka. status_dll_init_failed ). when run without -credential $credential program runs correctly. in order isolate problem, manually launched some.exe in prompt target credential , runs smoothly. so problem seems come way start-process cmdlet launch process. i found potential solutions problem tried apply no luck : link , link . would have idea of what's going on here ? edit 1: run proc mon monitoring program activities when launched directly or via powershell script. problem seems occur when loading kernelbase
Read more

twig - Using Twigbridge in a Laravel 5.1 Package -

i'm trying create laravel 5.1 package uses twigbridge instead of .php views. can normal .php views display fine, when try make use of .twig templates i'm met error. possible use twigbridge templates when creating views laravel package or pretty stuck blade , php ? edit 1: loading twig template without extending works. it's when start using {% extends 'file' %} error comes out. i error error loading /virtual/laravel/packages/username/mypackage/src/views/sample.twig: template "templates.master" not defined () in "/virtual/laravel/packages/username/mypackage/src/views/sample.twig" @ line 1. my folders username |_ mypackage |_ src |_ controllers - samplecontroller.php |_ views |_ templates - master.twig - sample.twig twig template sample.twig {% extends 'templates.master' %} {% block content %} {{ parent()
Read more

c# - LINQ join Entities from HashSet's, Join vs Dictionary vs HashSet performance -

i have hashset's each stores t, have written test application compares different relation algorithms can think of, i'm not pleased results getting. does there exist more efficient ways of achieving object relations, once testing? using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.diagnostics; namespace linqtests { class program { static void main(string[] args) { hashset<user> usertable = new hashset<user>(); hashset<userproperty> userpropertytable = new hashset<userproperty>(); #region lets create dummy data. console.writeline("please wait while creating dummy data, can take while..."); console.writeline(""); int rows = 1000000; for(int x = 0; x < rows; x++) { random rnd = new random(); // ad
Read more