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carauction-network
Advanced tools
This is an interactive, distributed, car auction demo. List assets for sale (setting a reserve price), and watch as assets that have met their reserve price are automatically transferred to the highest bidder at the end of the auction.
This business network defines:
Participants:
Member
Auctioneer
Assets:
Vehicle
VehicleListing
Transactions:
Offer
CloseBidding
The makeOffer
function is called when an Offer
transaction is submitted. The logic simply checks that the listing for the offer is still for sale, and then adds the offer to the listing, and then updates the offers in the VehicleListing
asset registry.
The closeBidding
function is called when a CloseBidding
transaction is submitted for processing. The logic checks that the listing is still for sale, sorts the offers by bid price, and then if the reserve has been met, transfers the ownership of the vehicle associated with the listing to the highest bidder. Money is transferred from the buyer's account to the seller's account, and then all the modified assets are updated in their respective registries.
To test this Business Network Definition in the Test tab:
In the Auctioneer
participant registry, create a new participant.
{
"$class": "org.acme.vehicle.auction.Auctioneer",
"email": "auction@acme.org",
"firstName": "Jenny",
"lastName": "Jones"
}
In the Member
participant registry, create two participants.
{
"$class": "org.acme.vehicle.auction.Member",
"balance": 5000,
"email": "memberA@acme.org",
"firstName": "Amy",
"lastName": "Williams"
}
{
"$class": "org.acme.vehicle.auction.Member",
"balance": 5000,
"email": "memberB@acme.org",
"firstName": "Billy",
"lastName": "Thompson"
}
In the Vehicle
asset registry, create a new asset of a vehicle owned by memberA@acme.org
.
{
"$class": "org.acme.vehicle.auction.Vehicle",
"vin": "vin:1234",
"owner": "resource:org.acme.vehicle.auction.Member#memberA@acme.org"
}
In the VehicleListing
asset registry, create a vehicle listing for car vin:1234
.
{
"$class": "org.acme.vehicle.auction.VehicleListing",
"listingId": "listingId:ABCD",
"reservePrice": 3500,
"description": "Arium Nova",
"state": "FOR_SALE",
"vehicle": "resource:org.acme.vehicle.auction.Vehicle#vin:1234"
}
You've just listed an Arium Nova for auction, with a reserve price of 3500!
As soon as a VehicleListing
has been created (and is in the FOR_SALE
state) participants can submit Offer
transactions to bid on a vehicle listing.
Submit an Offer
transaction, by submitting a transaction and selecting Offer
from the dropdown.
{
"$class": "org.acme.vehicle.auction.Offer",
"bidPrice": 2000,
"listing": "resource:org.acme.vehicle.auction.VehicleListing#listingId:ABCD",
"member": "resource:org.acme.vehicle.auction.Member#memberA@acme.org"
}
{
"$class": "org.acme.vehicle.auction.Offer",
"bidPrice": 3500,
"listing": "resource:org.acme.vehicle.auction.VehicleListing#listingId:ABCD",
"member": "resource:org.acme.vehicle.auction.Member#memberB@acme.org"
}
To end the auction submit a CloseBidding
transaction for the listing.
{
"$class": "org.acme.vehicle.auction.CloseBidding",
"listing": "resource:org.acme.vehicle.auction.VehicleListing#listingId:ABCD"
}
This simply indicates that the auction for listingId:ABCD
is now closed, triggering the closeBidding
function that was described above.
To see the Vehicle was sold you need to click on the Vehicle
asset registry to check the owner of the car. The reserve price was met by owner memberB@acme.org
so you should see the owner of the vehicle is now memberB@acme.org
.
If you check the state of the VehicleListing with listingId:ABCD
is should be SOLD
.
If you click on the Member
asset registry you can check the balance of each User. You should see that the balance of the buyer memberB@acme.org
has been debited by 3500
, whilst the balance of the seller memberA@acme.org
has been credited with 3500
.
Congratulations!
FAQs
Car Auction Business Network
The npm package carauction-network receives a total of 24 weekly downloads. As such, carauction-network popularity was classified as not popular.
We found that carauction-network demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 3 open source maintainers collaborating on the project.
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