NAME¶

CHI::Driver::FastMmap - Persistent interprocess cache via mmap'ed files

VERSION¶

version 0.61

SYNOPSIS¶

    use CHI;
    my $cache = CHI->new(
        driver     => 'FastMmap',
        root_dir   => '/path/to/cache/root',
        cache_size => '1m'
    );

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.

To support namespaces, this driver takes a directory parameter rather than a file, and creates one Cache::FastMMap file for each namespace.

Because CHI handles serialization automatically, we pass the "raw_values" flag as 1; and to conform to the CHI API, we pass "unlink_on_exit" as 0, so that all cache files are permanent.

REQUIREMENTS¶

You will need to install Cache::FastMmap from CPAN to use this driver.

CONSTRUCTOR OPTIONS¶

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 OS default temp directory (e.g. '/tmp' on UNIX).

dir_create_mode

Permissions mode to use when creating directories. Defaults to 0775.

Any other constructor options not recognized by CHI are passed along to Cache::FastMmap->new.

METHODS¶

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 API, e.g.

    $self->fm_cache->get_and_set("key", sub { ... });
    

SEE ALSO¶

CHI

AUTHOR¶

Jonathan Swartz <swartz@pobox.com>

COPYRIGHT AND LICENSE¶

This software is copyright (c) 2021 by Jonathan Swartz.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.