POE is a portable perl multitasking and networking framework for any event loop.
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$Id$ TABLE OF CONTENTS ================= Table of Contents; About POE; Compatibility (Non-Requirements and Requirements); Availability; Support Resources; Installing and Testing; The Future ABOUT POE ========= "POE" is an acronym for Perl Object Environment. This may change to Persistent Object Environment. First and foremost, it is a programming framework for event-driven state machines. POE includes high-level, functional interfaces for select, alarms, sockets and file I/O. The interfaces are robust but incomplete. From different vantage points, POE may look like other things: It may seem to be a cooperative multithreading model. It may be interpreted as a portable component architecture. Because it implements a low-level programming concept, POE can do many things. COMPATIBILITY ============= General ------- POE has been tested with as many Perl versions as the author (and testing pool) can find. This includes Linux, FreeBSD, and OS/2, all of which support enough of POSIX to run POE. It is known to work with older Perl versions, back to 5.004_03 (maybe earlier). It should also work with the latest stable release (the latest development release may also work). For the most recent compatibility results, see <http://www.perl.org/cpan-testers/results.cgi?request=dist&dist=POE>. If you have news about breakage or success that's not documented, please let me know. Thank you! Windows ------- The half-tested Windows support that was removed in 0.0806 turns out to be necessary and useful. It was put back in version 0.0807, and at least one Windows user, Douglas Couch <purdue.edu!dscouch>, has found joy using POE. Doug reports that POE works with the latest stable ActivePerl, prior to (but not including) version 5.6.0 RC1. He says that the 5.6.0 version includes fork() and other Unix compatibilities, but it still definitely seems to be beta level code. As of this writing, 5.6.0 has gone through its remaining release candidates and is in early "golden" distribution, so mileage most probably will vary. He writes: I've done some preliminary testing of the 0.0903 version and the re-addition of the Win32 support seems to be a success. I'll do some more intensive testing in the next few days to make sure nothing else is broken that I haven't missed. And later: After testing out my own program and having no problems with the newest version (with Win32 support), I thought I'd test out some of the samples and relay my results. filterchange.perl and preforkedserver.perl both contain fork commands which are still unsupported by ActiveState's port of Perl, so they were both unsuccessful. (this was anticipated for anything containing fork) ref-type.perl, refsender.perl, thrash.perl and wheels2.perl all ran up against the same unsupported POSIX macro. According to the error message, my vendor's POSIX doesn't support the macro EINPROGRESS ...q Other than those particular problems all of the other sample scripts ran fine. And later, after it was suggested to remove the EINPROGRESS code: > ... and running something that connects to an outbound server, > such as samples/proxy.perl. The normal "connection in progress" > state will become a failure, and the proxy will die in "connect" > with an error number and name. Ummmm... would you believe I did this and couldn't get it to break? I think I need to play a bit with the proxy settings in the sample, I couldn't make it do an http proxy, but I also couldn't make it break. ... so POE includes a fake EINPROGRESS constant on MSWin32 systems. P.S.: If you've just skipped ahead to read about Windows, you should skip back one section, to the General compatibility information, which may still apply. MacOS ----- Macintosh users have rumored that POE might work on MacOS, but none of them have stepped forward with actual failure or success reports. It would be greatly appreciated if someone could confirm or deny something. Anything? Bueller? Non-requirements ---------------- POE is compatible with fork(), but it is only used upon request. This distribution includes a sample server that uses a pool of forked children. POE will use Time::HiRes, if it's available. Nothing untoward should happen if it's not, unless you use one of the sample programs that absolutely requires it. POE currently uses no XS in its implementation. It should work wherever a sufficiently complete version of Perl does. Requirements ------------ As of version 0.1001, POE requires Filter::Call::Util, from the Filter distribution. It uses this module in POE::Preprocessor, which is a source filter that preprocesses macros, constants and enumerations. Filter 1.17 does not compile properly for threaded builds, so you will need 1.18 or later. If you can only acquire version 1.17 of the source filters modules, then also apply the patch posted to perl5-porters in this message: Message-Id: <E12YUJGemail@example.com> For portability, POE uses POSIX system calls and constants. There should be no problem running it on systems that have sufficient POSIX support. Some of POE's sample programs require a recent IO bundle, but you get that for free with recent versions of Perl. Filter::Reference requires either Storable, FreezeThaw or some other freeze/thaw package. Storable tends to be fastest, and it's checked first. The Reference filter can also use Compress::Zlib upon request, but it works without it too. Filter::HTTPD requires a small world of modules: HTTP::Status; HTTP::Request; HTTP::Date and URI::URL. The httpd.perl sample program uses Filter::HTTPD, which uses all that other stuff. The preforkedserver.perl sample program uses POE::Kernel::fork(), which in turn uses the fork() built-in. This may or may not be available on your planet. Other sample programs may require other modules, but the required modules aren't required if you don't require those specific features. AVAILABILITY ============ The latest stable release of POE is available three ways: 1: ``perl -MCPAN -e shell'' Then type ``install POE'' at the CPAN prompt. 2: In the /authors/id/R/RC/RCAPUTO/ on your favorite CPAN mirror. This is where the CPAN shell gets it. If you don't have a favorite CPAN mirror, you really ought to pick one. You can download and manually install the latest stable POE from <http://www.cpan.org/authors/id/R/RC/RCAPUTO/> until then. 3: Beta versions of the next release are available from the author. They tend to be mostly stable, and other module and program authors tend to use them because they're incrementally better than what's on the CPAN. Relatively stable betas are available from the POE web page, at <http://www.newts.org/~troc/>. SUPPORT RESOURCES ================= Places on the Internet where you can find more information about POE: POE has a mailing list thanks to Arturn Bergman. You may subscribe to it by sending e-mail: From: (the address to which you want your mail sent) To: firstname.lastname@example.org Subject: (anything will do) Anything will do for the body. All forms of feedback are welcome. POE has a web site thanks to Johnathan Vail. The latest POE development snapshot, along with the Changes file and some other stuff can be found at <http://www.newts.org/~troc/>. INSTALLING AND TESTING ====================== If you've been using POE since before 0.06, please, PLEASE read the Changes file before installing. Many things have been broken between versions 0.05 and 0.06. To build and test this distribution, type: perl Makefile.PL make make test Actually, 'make test' doesn't do anything important. The closest thing to real tests are the programs in the 'samples' directory. These show how to use various bits of POE, exercising each as a side effect. Once everything looks good, POE can be installed by typing: make install -- Rocco Caputo / email@example.com / Thank you for reading.