Ext onReady function var api url rpc type remoting actions Document na

Ext.onReady(function(){
    var api = {
    'url' : './../rpc/',
    'type': 'remoting',
    'actions' : {
        'Document' : [{
            'name' : 'all',
            'len' : 0
        },
    ]
    }
    };
    var provider = Ext.Direct.addProvider(api);
    Document.all(function(provider, response) {
        Ext.Msg.alert('Response', response.toSource());
    });
});