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Test2::IPC::Driver(3) User Contributed Perl DocumentationTest2::IPC::Driver(3)
NAME
       Test2::IPC::Driver - Base class for Test2 IPC drivers.
SYNOPSIS
           package Test2::IPC::Driver::MyDriver;
           use base 'Test2::IPC::Driver';
           ...
METHODS
       $self->abort($msg)
           If an IPC encounters a fatal error it should use this. This will
           print the message to STDERR with 'IPC Fatal Error: ' prefixed to
           it, then it will forcefully exit 255. IPC errors may occur in
           threads or processes other than the main one, this method provides
           the best chance of the harness noticing the error.
       $self->abort_trace($msg)
           This is the same as "$ipc->abort($msg)" except that it uses
           "Carp::longmess" to add a stack trace to the message.
LOADING DRIVERS
       Test2::IPC::Driver has an "import()" method. All drivers inherit this
       import method. This import method registers the driver.
       In most cases you just need to load the desired IPC driver to make it
       work. You should load this driver as early as possible. A warning will
       be issued if you load it too late for it to be effective.
           use Test2::IPC::Driver::MyDriver;
           ...
WRITING DRIVERS
           package Test2::IPC::Driver::MyDriver;
           use strict;
           use warnings;
           use base 'Test2::IPC::Driver';
           sub is_viable {
               return 0 if $^O eq 'win32'; # Will not work on windows.
               return 1;
           }
           sub add_hub {
               my $self = shift;
               my ($hid) = @_;
               ... # Make it possible to contact the hub
           }
           sub drop_hub {
               my $self = shift;
               my ($hid) = @_;
               ... # Nothing should try to reach the hub anymore.
           }
           sub send {
               my $self = shift;
               my ($hid, $e, $global) = @_;
               ... # Send the event to the proper hub.
               # This may notify other procs/threads that there is a pending event.
               Test2::API::test2_ipc_set_pending($uniq_val);
           }
           sub cull {
               my $self = shift;
               my ($hid) = @_;
               my @events = ...; # Here is where you get the events for the hub
               return @events;
           }
           sub waiting {
               my $self = shift;
               ... # Notify all listening procs and threads that the main
               ... # process/thread is waiting for them to finish.
           }
           1;
   METHODS SUBCLASSES MUST IMPLEMENT
       $ipc->is_viable
           This should return true if the driver works in the current
           environment. This should return false if it does not. This is a
           CLASS method.
       $ipc->add_hub($hid)
           This is used to alert the driver that a new hub is expecting
           events. The driver should keep track of the process and thread ids,
           the hub should only be dropped by the proc+thread that started it.
               sub add_hub {
                   my $self = shift;
                   my ($hid) = @_;
                   ... # Make it possible to contact the hub
               }
       $ipc->drop_hub($hid)
           This is used to alert the driver that a hub is no longer accepting
           events. The driver should keep track of the process and thread ids,
           the hub should only be dropped by the proc+thread that started it
           (This is the drivers responsibility to enforce).
               sub drop_hub {
                   my $self = shift;
                   my ($hid) = @_;
                   ... # Nothing should try to reach the hub anymore.
               }
       $ipc->send($hid, $event);
       $ipc->send($hid, $event, $global);
           Used to send events from the current process/thread to the
           specified hub in its process+thread.
               sub send {
                   my $self = shift;
                   my ($hid, $e) = @_;
                   ... # Send the event to the proper hub.
                   # This may notify other procs/threads that there is a pending event.
                   Test2::API::test2_ipc_set_pending($uniq_val);
               }
           If $global is true then the driver should send the event to all
           hubs in all processes and threads.
       @events = $ipc->cull($hid)
           Used to collect events that have been sent to the specified hub.
               sub cull {
                   my $self = shift;
                   my ($hid) = @_;
                   my @events = ...; # Here is where you get the events for the hub
                   return @events;
               }
       $ipc->waiting()
           This is called in the parent process when it is complete and
           waiting for all child processes and threads to complete.
               sub waiting {
                   my $self = shift;
                   ... # Notify all listening procs and threads that the main
                   ... # process/thread is waiting for them to finish.
               }
   METHODS SUBCLASSES MAY IMPLEMENT OR OVERRIDE
       $ipc->driver_abort($msg)
           This is a hook called by "Test2::IPC::Driver->abort()". This is
           your chance to cleanup when an abort happens. You cannot prevent
           the abort, but you can gracefully except it.
SOURCE
       The source code repository for Test2 can be found at
       http://github.com/Test-More/test-more/.
MAINTAINERS
       Chad Granum <exodist AT cpan.org>
AUTHORS
       Chad Granum <exodist AT cpan.org>
COPYRIGHT
       Copyright 2019 Chad Granum <exodist AT cpan.org>.
       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.
       See http://dev.perl.org/licenses/
perl v5.16.3                      2019-09-06             Test2::IPC::Driver(3)