NAME¶
HTTP::Proxy::Engine - Generic child process manager engine for HTTP::Proxy
SYNOPSIS¶
use HTTP::Proxy;
# use the default engine for your system
my $proxy = HTTP::Proxy->new();
# choose one
my $proxy = HTTP::Proxy->new( engine => 'Old' );
DESCRIPTION¶
The HTTP::Proxy::Engine class is a front-end to actual proxy engine classes.
The role of an engine is to implement the main fork+serve loop with all the
required bookkeeping. This is also a good way to test various implementation
and/or try out new algorithms without too much difficulties.
METHODS¶
- new()
- Create a new engine. The parameter "engine" is
used to decide which kind of engine will be created. Other parameters are
passed to the underlying engine.
This method also implement the subclasses constructor (they obviously do not
need the "engine" parameter).
CREATING YOUR OWN ENGINE¶
It is possible to create one's own engine, by creating a simple subclass of
HTTP::Proxy::Engine with the following methods:
- start()
- This method should handle any initialisation required when
the engine starts.
- run()
- This method is the main loop of the master process. It
defines how child processes are forked, checked and killed.
The engine MUST have a run() method, and it will be called again and
again until the proxy exits.
$self->proxy->daemon returns the listening socket that can
accept() connections. The child must call $self->proxy->
serve_connections() on the returned socket to handle actual TCP
connections.
- stop()
- This optional method should handle any cleanup procedures
when the engine stops (typically when the main proxy process is
killed).
A subclass may also define a %defaults hash (with "our") that contains
the default values for the fields used internaly.
METHODS PROVIDED TO SUBCLASSES¶
HTTP::Proxy::Engine provides the following methods to its subclasses:
- proxy()
- Return the HTTP::Proxy object that runs the engine.
- max_clients()
- Get or set the maximum number of TCP clients, that is to
say the maximum number of forked child process.
Some engines may understand a value of 0 as do not fork at all. This
is what HTTP::Proxy::Engine::Legacy does.
- make_accessors( @names )
- Create accessors named after @names in the subclass
package. All accessors are read/write. This is a utility method.
This is a class method.
AUTHOR¶
Philippe "BooK" Bruhat, "<book@cpan.org>".
COPYRIGHT¶
Copyright 2005, Philippe Bruhat.
LICENSE¶
This module is free software; you can redistribute it or modify it under the
same terms as Perl itself.