NAME

Web::AssetLib::InputEngine - a base class for writing your own Input Engine

SYNOPSIS

package My::Library::InputEngine;

use Moose;

extends 'Web::AssetLib::InputEngine';

sub load {
    my ( $self, $asset ) = @_;

    # your special file handing for $asset

    # store the digest and contents with the asset
    $self->storeAssetContents(
        asset    => $asset,
        digest   => $digest,
        contents => $contents
    );
}

Using the cache:

    sub load {
        ...

		unless( $self->getAssetFromCache($digest) ){
			# not in cache, so load it

			my $contents = ...;

			# add it to the cache
			$self->addAssetToCache( $digest => $contents );
		}
		
        ...
    }

USAGE

If you have a need for a special file input scenario, you can simply extend this class, and it will plug in to the rest of the Web::AssetLib pipeline.

The only requirement is that your Input Engine implements the load( $asset ) method. Load your file however you wish, and then call storeAssetContents.

Optionally, you may utilize the cache, with the addAssetToCache and getAssetFromCache methods.

IMPLEMENTATION

load( $asset )

Load/consume an asset represented by $asset, which will be a Web::AssetLib::Asset object. Load however you'd like, then call storeAssetContents to store the file for later use in the pipeline.

METHODS

storeAssetContents

$engine->storeAssetContents(
    asset    => $asset,
    digest   => $digest,
    contents => $contents
);

Associates the file contents and digest with the asset instance. $asset should be a Web::AssetLib::Asset object, and $contents and $digest must be strings.

This is the only method that must be called when you implement the load() method.

All arguments are required.

addAssetToCache

   $engine->addAssetToCache(
       digest => $digest
   );

Creates a mapping between your file $digest and file $contents in the cache. It is reccomended that the cache be utilized when implementing load() but it is not a requirement.

getAssetFromCache

   my $asset = $engine->getAssetFromCache( $digest );

Returns file contents associated with the digest if present in cache, otherwise returns undef. It is reccomended that the cache be utilized when implementing load() but it is not a requirement.

SEE ALSO

Web::AssetLib::InputEngine::LocalFile

Web::AssetLib::InputEngine::RemoteFile

Web::AssetLib::InputEngine::Content

AUTHOR

Ryan Lang <rlang@cpan.org>

cpanm Web::AssetLib

perl -MCPAN -e shell
install Web::AssetLib