Perhaps try just opening TWO old-school sockets, one for write, one for read... On Tue, February 27, 2007 8:12 pm, Bob Dusek wrote: > The company I work for is currently doing this... using PHP in a > retail > environment, with a Linux server in every store, talking to the POS > controller via a socket, storing data in a database (postgres), and > processing retail transactions in real-time. And, sending results of > those transactions to a central server (which isn't running Linux, > PHP, > or Apache). > > I'm finding the PHP socket support to be unreliable, though. > > Everything's fine when we have one socket open to talk to the store > controller. I open the socket and bind to an address:port, the store > controller connects to it just fine, and we move on. > > However, right now, we're using Postgres as a queue between two > programs > that are processing transactions. I'm trying to get rid of Postgres > and > use a pair of IPC sockets (created with socket_create_pair() and using > pcntl_fork()). > > The IPC sockets seem to be totally unreliable, at this point. > Sometimes, when I call socket_write(), the function just never > returns. > My application doesn't die.... but, the line of code immediately > following the socket_write() function never gets executed in the > parent > process. The child process receives the data and logs it > successfully. > So, I know the socket_write function is getting called and doing > something. It just never returns. > > Anyone here have any ideas? > > I can send more details, and even chunks of pertinent code. > >> -----Original Message----- >> From: Robert Cummings [mailto:robert@xxxxxxxxxxxxx] >> Sent: Tuesday, February 27, 2007 8:13 PM >> To: Jay Blanchard >> Cc: php-general@xxxxxxxxxxxxx >> Subject: Re: operational musings >> >> On Tue, 2007-02-27 at 18:59 -0600, Jay Blanchard wrote: >> > Howdy cats and kittens! >> > >> > I had an interesting thought after watching a demo of a POS >> system and >> > wondered if the same type of methodology could be applied in a PHP >> > application. I haven't thought this all the way through, but a >> > fully-hatched idea like this could signal a major change in >> applications >> > designed with PHP. >> > >> > In the POS if the network connectivity was lost the store >> could continue >> > to operate, once the network connectivity was restored the data >> from >> > each store would sync back up and data would be sent to the >> central >> > server, yadda, yadda, yadda. Of course this is in a client/server >> > application with an executable residing on each workstation. >> > >> > So, if you wanted to do this with PHP you would likely have >> to have a >> > local web /database server (each store), establish a socket >> (primary and >> > store servers?) to watch for an outage/restore and then >> write the code >> > to support the sync up. Can it be done with PHP? It would >> definitely be >> > worth the trouble given the frequency that connections to stores >> get >> > lost. >> >> Let's make a check list: >> >> local webserver -- check >> local database server -- check >> socket support -- check >> write code -- check >> >> All signs point to YES :) >> >> Cheers, >> Rob. >> -- >> .------------------------------------------------------------. >> | InterJinn Application Framework - http://www.interjinn.com | >> :------------------------------------------------------------: >> | An application and templating framework for PHP. Boasting | >> | a powerful, scalable system for accessing system services | >> | such as forms, properties, sessions, and caches. InterJinn | >> | also provides an extremely flexible architecture for | >> | creating re-usable components quickly and easily. | >> `------------------------------------------------------------' >> >> -- >> PHP General Mailing List (http://www.php.net/) >> To unsubscribe, visit: http://www.php.net/unsub.php >> >> > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- Some people have a "gift" link here. Know what I want? I want you to buy a CD from some starving artist. http://cdbaby.com/browse/from/lynch Yeah, I get a buck. So? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
