File: /var/www/tana/frontend/node_modules/vinyl-ftp/lib/cache.js
/**
* A cache keeps track of async resources and actions that
* should be loaded or executed only once.
*/
module.exports = function ( fn ) {
var cache = {};
this.get = function ( id, cb ) {
var entry = cache[ id ];
if ( entry ) {
if ( entry.done ) {
if ( cb ) cb( entry.err, entry.data );
} else {
entry.queue.push( cb );
}
return;
}
entry = cache[ id ] = {
done: false,
err: null,
data: null,
queue: [ cb ]
};
fn( id, function ( err, data ) {
entry.done = true;
entry.err = err;
entry.data = data;
entry.queue.forEach( function ( cb ) {
if ( cb ) cb( err, data );
} );
entry.queue = null;
} );
};
this.clear = function () {
cache = {};
};
this.remove = function ( id ) {
delete cache[ id ];
};
};