public void placeMarketOrder(Integer stockHolderId, TransactionType transactionType,
Integer quantity, String stockSymbol) {
Date opened = Calendar.getInstance().getTime();
MarketOrderEntity marketOrderEntity = new MarketOrderEntity();
marketOrderEntity.setStockHolderId(stockHolderId);
marketOrderEntity.setStockSymbol(stockSymbol);
marketOrderEntity.setOpened(opened);
marketOrderEntity.setOrderStatus(OrderStatus.Open);
marketOrderEntity.setQuantity(quantity);
marketOrderEntity.setTransactionType(transactionType);
entityManager.persist(marketOrderEntity);
}