The source code

    /**
     * @class Ext.data.DirectStore
     * @extends Ext.data.Store
     * Small helper class to create an {@link Ext.data.Store} configured with an
     * {@link Ext.data.DirectProxy} and {@link Ext.data.JsonReader} to make interacting
     * with an {@link Ext.Direct} Server-side {@link Ext.direct.Provider Provider} easier.
     * To create a different proxy/reader combination create a basic {@link Ext.data.Store}
     * configured as needed.
     *
     * *Note: Although they are not listed, this class inherits all of the config options of:
     *
     * {@link Ext.data.Store Store}
     *
     *
     *
     * {@link Ext.data.JsonReader JsonReader}
     *
     * {@link Ext.data.JsonReader#root root}
     * {@link Ext.data.JsonReader#idProperty idProperty}
     * {@link Ext.data.JsonReader#totalProperty totalProperty}
     *
     *
     * {@link Ext.data.DirectProxy DirectProxy}
     *
     * {@link Ext.data.DirectProxy#directFn directFn}
     * {@link Ext.data.DirectProxy#paramOrder paramOrder}
     * {@link Ext.data.DirectProxy#paramsAsHash paramsAsHash}
     *
     *
     *
     * @xtype directstore
     *
     * @constructor
     * @param {Object} config
     */
    Ext.data.DirectStore = function(c){
        // each transaction upon a singe record will generatie a distinct Direct transaction since Direct queues them into one Ajax request.
        c.batchTransactions = false;

        Ext.data.DirectStore.superclass.constructor.call(this, Ext.apply(c, {
            proxy: (typeof(c.proxy) == 'undefined') ? new Ext.data.DirectProxy(Ext.copyTo({}, c, 'paramOrder,paramsAsHash,directFn,api')) : c.proxy,
            reader: (typeof(c.reader) == 'undefined' && typeof(c.fields) == 'object') ? new Ext.data.JsonReader(Ext.copyTo({}, c, 'totalProperty,root,idProperty'), c.fields) : c.reader
        }));
    };
    Ext.extend(Ext.data.DirectStore, Ext.data.Store, {});
    Ext.reg('directstore', Ext.data.DirectStore);