Training project for microservices using:

• Spring
• Kafka
• Containerization

• Dealer issues offers and keeps a secret value coupled with the offer
• Buyer makes bids
• Moderator defines the winner(s) on the base of the secret value and bidding rules
• Auditor/Admin makes audit of the logs

• Offer it's an event {offerId, timestamp, expirationTime, price, textDescription}

• SecretValue it's a correct answer for a given offer (or a number to guess) {offerId, secretValue}

• Bid it's an event {bidId, buyerId, offerId, timestamp, stake, guessValue}

• Winner maybe we need separate winner event {bidId, offerId, buyerId, isWinner} or just a field isWinner in a Bid

• Dealer starts a playing session (offer event)
• Player makes a bet
• Moderator decides who is the winner(s)

• Seller (dealer) issues an offer
• Buyer makes a bid
• Auctioneer/AuctionManager decides who is the winner(s)

• Dealer issues a question
• Player sends an answer
• Moderator decides who is the winner(s)

• As a Buyer I want to log up or login in BIDDING service

• As a Buyer I want to see current offers and make a bid for the offer of my choice

• As a Buyer I want to see the current result of the bidding and the overall total result

• As a Dealer I want to issue an offer plus secret value for bidding rules and keep the record of all offers

• As a Moderator I want to see all the bids and the corresponding secret values, check the bids against bidding rules

• As a Moderator I want to calculate the total number of bids for a given offer, calculet the number of winners

• As a Moderator I want to calculate the shares and assign them to the winners

• As a Moderator I want to notify all the buyers and keep the record of the results

• As an Auditor I want to check all the events, offers, and bids in the timeline for at least 2 weeks

Dealer picks a number from 1 to 6 (as if it's the result of throwing a dice). Then Dealer sends an offer with expiration time (2 min) and keeps the record of the offer and the secret value.

Buyers see the offer and may send a bid with a number of their guess and for simplicity with a fixed stake.

Moderator receives all the bids, asks the Dealer cashed secret value (or get it from Dealer DataBase). Then Moderator check all the bids against secret values, marks winning bids.

Moderator discards all the bids that were created on expired offers. After the expiration time Moderator calculate all the lost bids and divide it equally among the winning bids. Then Moderator notifies all the Buyers and keeps the records.