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Net::Server::PreFork(3User Contributed Perl DocumentaNet::Server::PreFork(3pm)

NAME
       Net::Server::PreFork - Net::Server personality

SYNOPSIS
         use Net::Server::PreFork;
         @ISA = qw(Net::Server::PreFork);

         sub process_request {
            #...code...
         }

         __PACKAGE__->run();

DESCRIPTION
       Please read the pod on Net::Server and Net::Server::PreForkSimple
       first.  This module is a personality, or extension, or sub class, of
       the Net::Server::PreForkSimple class which is a sub class of
       Net::Server.  See Net::Server::PreForkSimple.

       This personality binds to one or more ports and then forks
       "min_servers" child process.  The server will make sure that at any
       given time there are "min_spare_servers" available to receive a client
       request, up to "max_servers".  Each of these children will process up
       to "max_requests" client connections.  This type is good for a heavily
       hit site, and should scale well for most applications.  (Multi port
       accept is accomplished using flock to serialize the children).

       At this time, it does not appear that this module will pass tests on
       Win32 systems.  Any ideas or patches for making the tests pass would be
       welcome.

SAMPLE CODE
       Please see the sample listed in Net::Server.

COMMAND LINE ARGUMENTS
       In addition to the command line arguments of the Net::Server base class
       and the Net::Server::PreForkSimple parent class, Net::Server::PreFork
       contains several other configurable parameters.  You really should also
       see Net::Server::PreForkSimple.

         Key                 Value                   Default
         min_servers         \d+                     5
         min_spare_servers   \d+                     2
         max_spare_servers   \d+                     10
         max_servers         \d+                     50
         max_requests        \d+                     1000

         serialize           (flock|semaphore|pipe)  undef
         # serialize defaults to flock on multi_port or on Solaris
         lock_file           "filename"              POSIX::tmpnam

         check_for_dead      \d+                     30
         check_for_waiting   \d+                     10

         max_dequeue         \d+                     undef
         check_for_dequeue   \d+                     undef

         child_communication 1                       undef

       min_servers
           The minimum number of servers to keep running.

       min_spare_servers
           The minimum number of servers to have waiting for requests.  Mini-
           mum and maximum numbers should not be set to close to each other or
           the server will fork and kill children too often.

       max_spare_servers
           The maximum number of servers to have waiting for requests.  See
           min_spare_servers.

       max_servers
           The maximum number of child servers to start.  This does not apply
           to dequeue processes.

       check_for_waiting
           Seconds to wait before checking to see if we can kill off some
           waiting servers.

       child_communication
           Enable child communication to parent via unix sockets.  If set to
           true, will let children write to the socket contained in
           $self->{server}->{parent_sock}.  The parent will be notified
           through child_is_talking_hook where the first argument is the
           socket to the child.  The child's socket is stored in
           $self->{server}->{children}->{$child_pid}->{sock}.

CONFIGURATION FILE
       "Net::Server::PreFork" allows for the use of a configuration file to
       read in server parameters.  The format of this conf file is simple key
       value pairs.  Comments and white space are ignored.

         #-------------- file test.conf --------------

         ### server information
         min_servers   20
         max_servers   80
         min_spare_servers 10
         min_spare_servers 15

         max_requests  1000

         ### user and group to become
         user        somebody
         group       everybody

         ### logging ?
         log_file    /var/log/server.log
         log_level   3
         pid_file    /tmp/server.pid

         ### access control
         allow       .+\.(net|com)
         allow       domain\.com
         deny        a.+

         ### background the process?
         background  1

         ### ports to bind
         host        127.0.0.1
         port        localhost:20204
         port        20205

         ### reverse lookups ?
         # reverse_lookups on

         ### enable child communication ?
         # child_communication

         #-------------- file test.conf --------------

PROCESS FLOW
       Process flow follows Net::Server until the loop phase.  At this point
       "min_servers" are forked and wait for connections.  When a child
       accepts a connection, finishs processing a client, or exits, it relays
       that information to the parent, which keeps track and makes sure there
       are enough children to fulfill "min_servers", "min_spare_servers",
       "max_spare_servers", and "max_servers".

HOOKS
       The PreFork server has the following hooks in addition to the hooks
       provided by PreForkSimple.  See Net::Server::PreForkSimple.

       "$self->run_n_children_hook()"
           This hook occurs at the top of run_n_children which is called each
           time the server goes to start more child processes.  This gives the
           parent to do a little of its own accountting (as desired).  Idea
           for this hook came from James FitzGibbon.

       "$self->parent_read_hook()"
           This hook occurs any time that the parent reads information from
           the child.  The line from the child is sent as an argument.

       "$self->child_is_talking_hook()"
           This hook occurs if child_communication is true and the child has
           written to $self->{server}->{parent_sock}.  The first argument will
           be the open socket to the child.

BUGS
       Tests don't seem to work on Win32.  Any ideas or patches would be wel-
       come.

TO DO
       See Net::Server

AUTHOR
       Paul T. Seamons paul@seamons.com

THANKS
       See Net::Server

SEE ALSO
       Please see also Net::Server::Fork, Net::Server::INET, Net::Server::Pre-
       ForkSimple, Net::Server::MultiType, Net::Server::Single
       Net::Server::SIG Net::Server::Daemonize Net::Server::Proto

perl v5.8.8                       2007-02-03         Net::Server::PreFork(3pm)

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