man Dancer::Route::Cache (3): route caching mechanism for Dancer

VERSION

version 1.3202

SYNOPSIS

my $cache = Dancer::Route::Cache->new(
path_limit => 300, # optional, defaults to 600 (routes to cache)
size_limit => 5M, # optional, defaults to 10M (10MB)
);
# storing a path
# /new/item/ is the path, $route is a compiled route
$cache->store_path( 'get', '/new/item/', $route );
my $cached_route = $cache->route_from_path('/new/item/');

DESCRIPTION

When Dancer first starts, it has to compile a regexp list of all the routes. Then, on each request it goes over the compiled routes list and tries to compare the requested path to a route.

A major drawback is that Dancer has to go over the matching on every request, which (especially on CGI-based applications) can be very time consuming.

The caching mechanism allows one to cache some requests to specific routes (but NOT specific results) and run those routes on a specific path. This allows us to speed up Dancer quite a lot.

METHODS/SUBROUTINES

new(@args)

Creates a new route cache object.

    my $cache = Dancer::Route::Cache->new(
        path_limit => 100,   # only 100 paths will be cached
        size_limit => '30M', # max size for cache is 30MB
    );

Please check the "ATTRIBUTES" section below to learn about the arguments for "new()".

route_from_path($path)

Fetches the route from the path in the cache.

store_path( $method, $path => $route )

Stores the route in the cache according to the path and $method.

For developers: the reason we're using an object for this and not directly using the registry hash is because we need to enforce the limits.

parse_size($size)

Parses the size wanted to bytes. It can handle Kilobytes, Megabytes or Gigabytes.

NOTICE: handles bytes, not bits!

    my $bytes = $cache->parse_size('30M');
    # doesn't need an existing object
    $bytes = Dancer::Route::Cache->parse_size('300G'); # works this way too

route_cache_size

Returns a rough calculation the size of the cache. This is used to enforce the size limit.

route_cache_paths

Returns all the paths in the cache. This is used to enforce the path limit. Please be careful if you use ``mount'' in Plack::Builder and some applications - routes are linked with applications and same path may be in some applications but with different handlers!

ATTRIBUTES

size_limit($limit)

Allows one to set a size limit of the cache.

Returns the limit (post-set).

    $cache->size_limit('10K');      # sets limit
    my $limit = $cache->size_limit; # gets limit

path_limit($limit)

A path limit. That is, the amount of paths that whose routes will be cached.