Edit File: DBD::Gofer::Transport::corostream.3pm
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" DBD::Gofer::Transport::corostream \- Async DBD::Gofer stream transport using Coro and AnyEvent .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& DBI_AUTOPROXY="dbi:Gofer:transport=corostream" perl some\-perl\-script\-using\-dbi.pl .Ve .PP or .PP .Vb 2 \& $dsn = ...; # the DSN for the driver and database you want to use \& $dbh = DBI\->connect("dbi:Gofer:transport=corostream;dsn=$dsn", ...); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" The \fI\s-1BIG\s0 \s-1WIN\s0\fR from using Coro is that it enables the use of existing \&\s-1DBI\s0 frameworks like DBIx::Class. .SH "KNOWN ISSUES AND LIMITATIONS" .IX Header "KNOWN ISSUES AND LIMITATIONS" .Vb 2 \& \- Uses Coro::Select so alters CORE::select globally \& Parent class probably needs refactoring to enable a more encapsulated approach. \& \& \- Doesn\*(Aqt prevent multiple concurrent requests \& Probably just needs a per\-connection semaphore \& \& \- Coro has many caveats. Caveat emptor. .Ve .SH "STATUS" .IX Header "STATUS" \&\s-1THIS\s0 \s-1IS\s0 \s-1CURRENTLY\s0 \s-1JUST\s0 A PROOF-OF-CONCEPT \s-1IMPLEMENTATION\s0 \s-1FOR\s0 \s-1EXPERIMENTATION\s0. .PP Please note that I have no plans to develop this code further myself. I'd very much welcome contributions. Interested? Let me know! .SH "AUTHOR" .IX Header "AUTHOR" Tim Bunce, <http://www.tim.bunce.name> .SH "LICENCE AND COPYRIGHT" .IX Header "LICENCE AND COPYRIGHT" Copyright (c) 2010, Tim Bunce, Ireland. All rights reserved. .PP This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic. .SH "SEE ALSO" .IX Header "SEE ALSO" DBD::Gofer::Transport::stream .PP DBD::Gofer .SH "APPENDIX" .IX Header "APPENDIX" Example code: .PP .Vb 1 \& #!perl \& \& use strict; \& use warnings; \& use Time::HiRes qw(time); \& \& BEGIN { $ENV{PERL_ANYEVENT_STRICT} = 1; $ENV{PERL_ANYEVENT_VERBOSE} = 1; } \& \& use AnyEvent; \& \& BEGIN { $ENV{DBI_TRACE} = 0; $ENV{DBI_GOFER_TRACE} = 0; $ENV{DBD_GOFER_TRACE} = 0; }; \& \& use DBI; \& \& $ENV{DBI_AUTOPROXY} = \*(Aqdbi:Gofer:transport=corostream\*(Aq; \& \& my $ticker = AnyEvent\->timer( after => 0, interval => 0.1, cb => sub { \& warn sprintf "\-tick\- %.2f\en", time \& } ); \& \& warn "connecting...\en"; \& my $dbh = DBI\->connect("dbi:NullP:"); \& warn "...connected\en"; \& \& for (1..3) { \& warn "entering DBI...\en"; \& $dbh\->do("sleep 0.3"); # pseudo\-sql understood by the DBD::NullP driver \& warn "...returned\en"; \& } \& \& warn "done."; .Ve .PP Example output: .PP .Vb 10 \& $ perl corogofer.pl \& connecting... \& \-tick\- 1293631437.14 \& \-tick\- 1293631437.14 \& ...connected \& entering DBI... \& \-tick\- 1293631437.25 \& \-tick\- 1293631437.35 \& \-tick\- 1293631437.45 \& \-tick\- 1293631437.55 \& ...returned \& entering DBI... \& \-tick\- 1293631437.66 \& \-tick\- 1293631437.76 \& \-tick\- 1293631437.86 \& ...returned \& entering DBI... \& \-tick\- 1293631437.96 \& \-tick\- 1293631438.06 \& \-tick\- 1293631438.16 \& ...returned \& done. at corogofer.pl line 39. .Ve .PP You can see that the timer callback is firing while the code 'waits' inside the \&\fIdo()\fR method for the response from the database. Normally that would block.
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