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.\" ========================================================================
.\"
.IX Title "CHI::Driver::FastMmap 3pm"
.TH CHI::Driver::FastMmap 3pm "2012-05-30" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
CHI::Driver::FastMmap \- Persistent interprocess cache via mmap'ed files
.SH "VERSION"
.IX Header "VERSION"
version 0.54
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use CHI;
\&
\&    my $cache = CHI\->new(
\&        driver     => \*(AqFastMmap\*(Aq,
\&        root_dir   => \*(Aq/path/to/cache/root\*(Aq,
\&        cache_size => \*(Aq1m\*(Aq
\&    );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This cache driver uses Cache::FastMmap to store data in an mmap'ed file. It is
very fast, and can be used to share data between processes on a single host,
though not between hosts.
.PP
To support namespaces, this driver takes a directory parameter rather than a
file, and creates one Cache::FastMMap file for each namespace.
.PP
Because \s-1CHI\s0 handles serialization automatically, we pass the \f(CW\*(C`raw_values\*(C'\fR flag
as 1; and to conform to the \s-1CHI\s0 \s-1API\s0, we pass \f(CW\*(C`unlink_on_exit\*(C'\fR as 0, so that
all cache files are permanent.
.SH "REQUIREMENTS"
.IX Header "REQUIREMENTS"
You will need to install Cache::FastMmap from \s-1CPAN\s0 to use
this driver.
.SH "CONSTRUCTOR OPTIONS"
.IX Header "CONSTRUCTOR OPTIONS"
.IP "root_dir" 4
.IX Item "root_dir"
Path to the directory that will contain the share files, one per namespace.
Defaults to a directory called 'chi\-driver\-fastmmap' under the \s-1OS\s0 default temp
directory (e.g. '/tmp' on \s-1UNIX\s0).
.IP "dir_create_mode" 4
.IX Item "dir_create_mode"
Permissions mode to use when creating directories. Defaults to 0775.
.PP
Any other constructor options not recognized by \s-1CHI\s0 are
passed along to Cache::FastMmap\->new.
.SH "METHODS"
.IX Header "METHODS"
.IP "fm_cache" 4
.IX Item "fm_cache"
Returns a handle to the underlying Cache::FastMmap object. You can use this to
call FastMmap-specific methods that are not supported by the general \s-1API\s0, e.g.
.Sp
.Vb 1
\&    $self\->fm_cache\->get_and_set("key", sub { ... });
.Ve
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1CHI\s0
.SH "AUTHOR"
.IX Header "AUTHOR"
Jonathan Swartz <swartz@pobox.com>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2011 by Jonathan Swartz.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.