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.IX Title "Catalyst::Engine::HTTP::POE 3"
.TH Catalyst::Engine::HTTP::POE 3 "2008-01-18" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Catalyst::Engine::HTTP::POE \- Single\-threaded multi\-tasking Catalyst engine
.SH "SYNOPIS"
.IX Header "SYNOPIS"
.Vb 1
\&    CATALYST_ENGINE='HTTP::POE' script/yourapp_server.pl
.Ve
.PP
.Vb 2
\&    # Prefork 5 children
\&    CATALYST_POE_MAX_PROC=6 CATALYST_ENGINE='HTTP::POE' script/yourapp_server.pl
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This engine allows Catalyst to process multiple requests in parallel within a
single process.  Much of the internal Catalyst flow now uses \s-1POE\s0 yield calls.
Application code will still block of course, but all I/O, header processing, and
\&\s-1POST\s0 body processing is handled asynchronously.
.PP
A good example of the engine's power is the Catalyst::Plugin::UploadProgress demo
application, which can process a file upload as well as an Ajax polling request
at the same time in the same process.
.PP
This engine requires at least Catalyst 5.67.
.SH "RESTART SUPPORT"
.IX Header "RESTART SUPPORT"
As of version 0.05, the \-r flag is supported and the server will restart itself when any
application files are modified.
.SH "PREFORKING"
.IX Header "PREFORKING"
As of version 0.05, the engine is able to prefork a set number of child processes to distribute
requests.  Set the \s-1CATALYST_POE_MAX_PROC\s0 environment variable to the total number of processes
you would like to run, including the parent process.  So, to prefork 5 children, set this value
to 6.  This value may also be set by modifying yourapp_server.pl and adding max_proc to the
options hash passed to YourApp\->\fIrun()\fR.
.SH "DEBUGGING"
.IX Header "DEBUGGING"
To enable trace-level debugging, set the environment variable \s-1CATALYST_POE_DEBUG\s0.
.PP
At any time you can get a dump of the internal state of the engine by sending a
\&\s-1USR1\s0 signal to the running process.
.SH "EXPERIMENTAL STATUS"
.IX Header "EXPERIMENTAL STATUS"
This engine should still be considered experimental and likely has bugs,
however as it's only intended for development, please use it and report bugs.
.PP
The engine has been tested with the UploadProgress demo, the Streaming example,
and one of my own moderately large applications.  It also fully passes the Catalyst
test suite.
.SH "AUTHOR"
.IX Header "AUTHOR"
Andy Grundman, <andy@hybridized.org>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
This program is free software, you can redistribute it and/or modify it under
the same terms as Perl itself.