[OpenLayers-Users] What is return in wfs1 ?

[Mustafa646]

if wfs protocol successfully fetched features from geoserver, then what will
be returned to wfs1 variable in the code below. Actually i want to draw wfs1
over google map if it is populated successfully. And if wfs1 is not
populated, i want to do some thing other. 

Before drawing wfs1 over google map, i want to check wfs variable whether it
is populated or not?
is there any way to check this?  

var wfs1 = new OpenLayers.Layer.Vector("Results Nacka Norra", {
                    strategies: [new OpenLayers.Strategy.BBOX()],

                    protocol: new OpenLayers.Protocol.WFS({
                        url: "http://localhost:8080/geoserver/wfs",
                        featureType: "traget_grave",
                        featureNS: "http://www.openplans.org/TestSpace",

                        srsName: "EPSG:900913",
                        version: "1.1.0",
                        extractAttributes: true,
                        isBaseLayer: false,
                        visibility: true
                    }),

                    filter: filter

                });

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