DBD::Gofer::Transport::corostream - Async DBD::Gofer stream transport using Coro and AnyEvent
DBI_AUTOPROXY="dbi:Gofer:transport=corostream" perl some-perl-script-using-dbi.pl or $dsn = ...; # the DSN for the driver and database you want to use $dbh = DBI->connect("dbi:Gofer:transport=corostream;dsn=$dsn", ...);
User Contributed Perl Documentation DBD::Gofer::Transport::corostream(3) NAME DBD::Gofer::Transport::corostream - Async DBD::Gofer stream transport using Coro and AnyEvent SYNOPSIS DBI_AUTOPROXY="dbi:Gofer:transport=corostream" perl some-perl-script-using-dbi.pl or $dsn = ...; # the DSN for the driver and database you want to use $dbh = DBI->connect("dbi:Gofer:transport=corostream;dsn=$dsn", ...); DESCRIPTION The BIG WIN from using Coro is that it enables the use of existing DBI frameworks like DBIx::Class. KNOWN ISSUES AND LIMITATIONS - Uses Coro::Select so alters CORE::select globally Parent class probably needs refactoring to enable a more encapsulated approach. - Doesn't prevent multiple concurrent requests Probably just needs a per-connection semaphore - Coro has many caveats. Caveat emptor. STATUS THIS IS CURRENTLY JUST A PROOF-OF-CONCEPT IMPLEMENTATION FOR EXPERIMENTATION. Please note that I have no plans to develop this code further myself. I'd very much welcome contributions. Interested? Let me know! AUTHOR Tim Bunce, <http://www.tim.bunce.name> LICENCE AND COPYRIGHT Copyright (c) 2010, Tim Bunce, Ireland. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+-----------------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+-----------------------------+ |Availability | library/perl-5/database-532 | +---------------+-----------------------------+ |Stability | Committed | +---------------+-----------------------------+ SEE ALSO DBD::Gofer::Transport::stream DBD::Gofer APPENDIX Example code: #!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} = 'dbi:Gofer:transport=corostream'; my $ticker = AnyEvent->timer( after => 0, interval => 0.1, cb => sub { warn sprintf "-tick- %.2f\n", time } ); warn "connecting...\n"; my $dbh = DBI->connect("dbi:NullP:"); warn "...connected\n"; for (1..3) { warn "entering DBI...\n"; $dbh->do("sleep 0.3"); # pseudo-sql understood by the DBD::NullP driver warn "...returned\n"; } warn "done."; Example output: $ 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. You can see that the timer callback is firing while the code 'waits' inside the do() method for the response from the database. Normally that would block. NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from http://backpan.perl.org/authors/id/T/TI/TIMB/DBI-1.643.tar.gz. Further information about this software can be found on the open source community website at http://search.cpan.org/~timb/DBI/. perl v5.32.0 2013-04-04 DBD::Gofer::Transport::corostream(3)