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Use POE, was Re: Time-limited input on STDIN

by RMGir (Prior)
on Aug 09, 2003 at 09:51 UTC ( #282391=note: print w/replies, xml ) Need Help??

in reply to Time-limited input on STDIN

It probably looks like overkill for your project, but you should consider looking into POE.

It would allow you to completely separate your timeout rules from your input processing.

There's a decent introduction to POE available. Matt Sergeant wrote up a good tutorial as well. (All of these are from the recent Documentation for POE? thread.)

I only started looking at POE this week, and I'm REALLY impressed with how easy it makes many things.

Here's code that does what you want. I'm sure there's lots of POE folks around who will be kind enough to point out improvements, this is only my 2nd attempt at a POE program.

#!/usr/bin/perl -w use strict; # Use POE! use POE qw/Wheel::ReadLine/; # Need to do this on Cygwin #$/="\n\r"; $|++; POE::Session->create( inline_states => { _start => \&handler_start, gotLine => \&handler_gotLine, prompt => \&handler_prompt, timeout => \&handler_timeout, _stop => \&handler_stop, } ); $poe_kernel->run(); exit; sub handler_start { my ($kernel, $heap, $session) = @_[KERNEL, HEAP, SESSION]; # POE::Wheel::ReadLine gets you terminal input with command line # history. whenever a line is input, the 'gotLine' event # will run $heap->{wheel} = POE::Wheel::ReadLine->new ( InputEvent => 'gotLine', ); # ask for the prompt event to get run next $kernel->yield('prompt'); } sub handler_prompt { my ($kernel, $heap, $session) = @_[KERNEL, HEAP, SESSION]; print "You have 10 seconds to enter something, or I'll quit!$/"; $heap->{wheel}->get('Type fast: '); # this will make the timeout event fire in 10 seconds $kernel->delay('timeout',10); } sub handler_gotLine { my ($kernel, $heap, $session, $arg, $exception) = @_[KERNEL, HEAP, S +ESSION, ARG0, ARG1]; if(defined $arg) { $heap->{wheel}->addhistory($arg); print "Very good, you entered '$arg'. You get another 10 seconds. +$/"; } else { print "Got input exception '$exception'. Exiting...$/"; # setting this to undef will make our Wheel get shutdown $heap->{wheel}=undef; # setting a delay without a timeout number clears the event $kernel->delay('timeout'); return; } # run the prompt event again to reset timeout and print # new prompt $kernel->yield('prompt'); } sub handler_timeout { my ($kernel, $heap, $session) = @_[KERNEL, HEAP, SESSION]; print "You took too long, game over$/"; # setting this to undef will make our Wheel get shutdown # with no wheel, and no pending delay event, the kernel # queue is empty resulting in shutdown $heap->{wheel}=undef; } sub handler_stop { print "Session ", $_[SESSION]->ID, " has stopped.$/"; }


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