Current File : //usr/local/share/man/man3/DBD::Gofer::Transport::corostream.3pm
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.IX Title "DBD::Gofer::Transport::corostream 3"
.TH DBD::Gofer::Transport::corostream 3 "2013-04-05" "perl v5.16.3" "User Contributed Perl Documentation"
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.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 WIN\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 IS CURRENTLY JUST A\s0 PROOF-OF-CONCEPT \s-1IMPLEMENTATION FOR EXPERIMENTATION.\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.
Mini Shell