Order execution platform

[rozick1]

Hi

I thought a good programming exercise might be designing an order execution platform for stocks. E.g. matching buy order and sell orders

Does anyone have any thoughts about this? Would I need a database to represent orders or could I just use an object to represent an order?

Thanks

[helios]

Would I need a database to represent orders or could I just use an object to represent an order?

That depends. Do you care if the data is reset after the program stops?

[rozick1]

no, i suppose not

thinking about it, i'm not even that sure how the orders are matched. i guess there are certain rules, like:

1. all stock in a single order must be bought be sold/bought for the same price
2. an order cannot be executed unless each stock in the order is sold/bought
3. there are different types of order - limit (sell/buy only once a min/max is reached) and market (sell/buy for whatever is best price)
4. stocks can be sold to/bought from multiple buyers/sellers in order to execute an order
5. if multiple identical orders, then execute first order first (but what about when non-identical and later order can be matched but first order cannot as different number of stock in the order?)

lots of interesting concepts here but couldn't find much online