ExternalStoreMedium.php

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<?php
abstract class ExternalStoreMedium {
    protected $params = [];
 
    public function __construct( array $params = [] ) {
        $this->params = $params;
    }
 
    abstract public function fetchFromURL( $url );
 
    public function batchFetchFromURLs( array $urls ) {
        $retval = [];
        foreach ( $urls as $url ) {
            $data = $this->fetchFromURL( $url );
            // Dont return when false to allow for simpler implementations.
            // errored urls are handled in ExternalStore::batchFetchFromURLs
            if ( $data !== false ) {
                $retval[$url] = $data;
            }
        }
 
        return $retval;
    }
 
    abstract public function store( $location, $data );
}