Changed default getKeyNames to user randomObject iteration - making it more performant on large datasets (used for mongodb)

Author: PicoCreator

src/main/java/picoded/dstack/DataObjectMap.java

@@ -335,18 +335,18 @@ default Set<String> getKeyNames(int seekDepth) {
 		Set<String> res = new HashSet<String>();
 
 		// Iterate the list, get key names
-		int idx = 0;
-		for (DataObject obj : values()) {
-			
-			// Break iteration once seekdepth limits reached
-			if (idx >= seekDepth && seekDepth >= 0) {
-				break;
+		DataObject obj = randomObject();
+		res.addAll(obj.keySet());
+
+		// Lets iterate through
+		for(int i=1; i<seekDepth; ++i) {
+			obj = looselyIterateObject(obj);
+			if(obj != null) {
+				res.addAll(obj.keySet());
 			}
-			
-			// Add all the various key names
-			res.addAll(obj.keySet());
 		}
 
+		// Return the result set
 		return res;
 	}