NAME
Async::Simple::Task::ForkTmpFile - Forks child process.
It waits for "data" whic will be passed via "put", and executed "sub" with this "data" as an argument.
Result of execution will be returned to parent by "get".
The behaviour of this class all the same as of Async::Simple::Task::Fork
except that it use files as interprocess transport instead of pipes.
This class is recommended only as workaround for systems which don't support
bidirectional pipes.
SYNOPSIS
use Async::Simple::Task::ForkTmpFile;
my $sub = sub { sleep 1; return $_[0]{x} + 1 }; # Accepts $data as @_ and returns any type you need
my $task = Async::Simple::Task::ForkTmpFile->new( task => &$sub ); # Creates a child process, which waits for data and execute &$sub if data is passed
my $data = { x => 123 }; # Any type you wish: scalar, array, hash
$task->put( $data ); # Put a task data to sub in the child process
# ...do something useful in parent while our data working ...
my $result = $task->get; # result = undef because result is not ready yet
sleep 2; # or do something else....
my $result = $task->get; # result = 2
$task->put( $data ); # Put another data to task sub and so on,....
Result and data can be of any type and deep which can be translated via Data::Serializer->new( serializer => Storable ) # by default
If your "sub" can return undef you should check $task->has_result, as a mark that result is ready.
DESCRIPTION
Allows to initialize fork process.
After that, executes "sub" for each "data" passed to child process.
METHODS
new
Forks a process
my $task = Async::Simple::Task::ForkTmpFile->new( task => &$sub, %other_optional_params );
Params (all param except "task" are optional):
task => coderef, function, called for each "data" passed to child process via $task->put( $data );
timeout => timeout in seconds between child checkings for new data passed. default 0.01
kill_on_exit => kill (1) or not (0) subprocess on object destroy (1 by default).
put
Puts data to task.
$self->put( $data );
get
Tries to read result from task.
Returns undef if it is not ready.
In case, your function can return undef, you shoud check $task->has_answer, as a mark of ready result.
my $result = $self->get();
SUPPORT AND DOCUMENTATION
After installing, you can find documentation for this module with the perldoc command.
perldoc Async::Simple::Task::ForkTmpFile
You can also look for information at:
RT, CPAN's request tracker (report bugs here)
http://rt.cpan.org/NoAuth/Bugs.html?Dist=Async-Simple-Task-ForkTmpFile
AnnoCPAN, Annotated CPAN documentation
http://annocpan.org/dist/Async-Simple-Task-ForkTmpFile
CPAN Ratings
http://cpanratings.perl.org/d/Async-Simple-Task-ForkTmpFile
Search CPAN
http://search.cpan.org/dist/Async-Simple-Task-ForkTmpFile/
AUTHOR
ANTONC <antonc@cpan.org>
LICENSE
This program is free software; you can redistribute it and/or modify it
under the terms of the the Artistic License (2.0). You may obtain a
copy of the full license at:
L<http://www.perlfoundation.org/artistic_license_2_0>
Attributes
task
task = sub {
my ( $data ) = @_; # source data for task
... your task code ...
return( $result );
}
answer
Result of current task
has_answer
has_answer is true, if the task has been finished and result has been ready
timeout
timeout - positive numeric value = seconds between checking for result.
inherited from Async::Simple::Task.
kill_on_exit
Kills process from parent in case of object desctuction
new()
my $task = Async::Simple::Task::ForkTmpFile->new( %all_optional_params );
Possible keys for %all_optional_params:
task => coderef, function, called for each "data" passed to child process via $task->put( $data );
timeout => timeout in seconds between child checkings for new data passed. default 0.01
kill_on_exit => kill (1) or not (0) subprocess on object destroy (1 by default).
BUILD
internal. Some tricks here:)
1. Master process called $task->new with fork() inside
2. After forking done we have two processes:
2.1. Master gets one side of reader/writer tmp file handlers and pid of child
2.2. Child - another side of tmp file handlers and extra logic with everlasting loop
fork_child
Makes child process and returns pid of child process to parent or 0 to child process
get
Reads from task, if something can be readed or returns undef after timeout.
my $result = $task->get;
Please note! If your function can return an undef value, then you shoud check
$task->has_result.
put
Writes task to task.
$task->put( $data );
get_serializer
Internal. Returns an object that must have 2 methods: serialize and deserialize. By default returns Data::Serializer with Storable as backend.
$self->serializer->serialize( $task_data_ref );
$result_ref = $self->serializer->deserialize();