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LWP::ConnCache(3pm) User Contributed Perl Documentation LWP::ConnCache(3pm)
NAME
LWP::ConnCache - Connection cache manager
NOTE
This module is experimental. Details of its interface is likely to change in the future.
SYNOPSIS
use LWP::ConnCache;
my $cache = LWP::ConnCache->new;
$cache->deposit($type, $key, $sock);
$sock = $cache->withdraw($type, $key);
DESCRIPTION
The "LWP::ConnCache" class is the standard connection cache manager for LWP::UserAgent.
METHODS
The following basic methods are provided:
new
my $cache = LWP::ConnCache->new( %options )
This method constructs a new LWP::ConnCache object. The only option currently accepted is
"total_capacity". If specified it initializes the "total_capacity" in LWP::ConnCache
option. It defaults to 1.
total_capacity
my $cap = $cache->total_capacity;
$cache->total_capacity(0); # drop all immediately
$cache->total_capacity(undef); # no limit
$cache->total_capacity($number);
Get/sets the number of connection that will be cached. Connections will start to be
dropped when this limit is reached. If set to 0, then all connections are immediately
dropped. If set to "undef", then there is no limit.
capacity
my $http_capacity = $cache->capacity('http');
$cache->capacity('http', 2 );
Get/set a limit for the number of connections of the specified type that can be cached.
The first parameter is a short string like "http" or "ftp".
drop
$cache->drop(); # Drop ALL connections
# which is just a synonym for:
$cache->drop(sub{1}); # Drop ALL connections
# drop all connections older than 22 seconds and add a reason for it!
$cache->drop(22, "Older than 22 secs dropped");
# which is just a synonym for:
$cache->drop(sub {
my ($conn, $type, $key, $deposit_time) = @_;
if ($deposit_time < 22) {
# true values drop the connection
return 1;
}
# false values don't drop the connection
return 0;
}, "Older than 22 secs dropped" );
Drop connections by some criteria. The $checker argument is a subroutine that is called
for each connection. If the routine returns a TRUE value then the connection is dropped.
The routine is called with "($conn, $type, $key, $deposit_time)" as arguments.
Shortcuts: If the $checker argument is absent (or "undef") all cached connections are
dropped. If the $checker is a number then all connections untouched that the given number
of seconds or more are dropped. If $checker is a string then all connections of the given
type are dropped.
The "reason" is passed on to the "dropped" in LWP::ConnCache method.
prune
$cache->prune();
Calling this method will drop all connections that are dead. This is tested by calling
the "ping" in LWP::ConnCache method on the connections. If the "ping" in LWP::ConnCache
method exists and returns a false value, then the connection is dropped.
get_types
my @types = $cache->get_types();
This returns all the "type" fields used for the currently cached connections.
get_connections
my @conns = $cache->get_connections(); # all connections
my @conns = $cache->get_connections('http'); # connections for http
This returns all connection objects of the specified type. If no type is specified then
all connections are returned. In scalar context the number of cached connections of the
specified type is returned.
PROTOCOL METHODS
The following methods are called by low-level protocol modules to try to save away
connections and to get them back.
deposit
$cache->deposit($type, $key, $conn);
This method adds a new connection to the cache. As a result, other already cached
connections might be dropped. Multiple connections with the same type/key might be added.
withdraw
my $conn = $cache->withdraw($type, $key);
This method tries to fetch back a connection that was previously deposited. If no cached
connection with the specified $type/$key is found, then "undef" is returned. There is not
guarantee that a deposited connection can be withdrawn, as the cache manger is free to
drop connections at any time.
INTERNAL METHODS
The following methods are called internally. Subclasses might want to override them.
enforce_limits
$conn->enforce_limits([$type])
This method is called with after a new connection is added (deposited) in the cache or
capacity limits are adjusted. The default implementation drops connections until the
specified capacity limits are not exceeded.
dropping
$conn->dropping($conn_record, $reason)
This method is called when a connection is dropped. The record belonging to the dropped
connection is passed as the first argument and a string describing the reason for the drop
is passed as the second argument. The default implementation makes some noise if the
$LWP::ConnCache::DEBUG variable is set and nothing more.
SUBCLASSING
For specialized cache policy it makes sense to subclass "LWP::ConnCache" and perhaps
override the "deposit" in LWP::ConnCache, "enforce_limits" in LWP::ConnCache, and
"dropping" in LWP::ConnCache methods.
The object itself is a hash. Keys prefixed with "cc_" are reserved for the base class.
SEE ALSO
LWP::UserAgent
COPYRIGHT
Copyright 2001 Gisle Aas.
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
perl v5.32.1 2022-01-28 LWP::ConnCache(3pm)
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On Apache
Under GNU General Public License
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