英文:
Corda - Avoid issuing duplicated states
问题
我对 Corda 还不太了解，所以可能有些遗漏。避免参与方（或不同参与方）发布重复状态的最佳方法是什么？例如，我想阻止使用之前已发布的具有相同卖方、买方、日期和金额的 IOU。
英文:
I am pretty new to Corda, so I might have missed something.
What would be the best way to avoid a party(or different parties) issuing duplicated states?
For example, I want to block issuing an IOU with a seller, buyer,
date and value that was previously issued.
答案1
得分: 1
- 在 Corda 中，交易状态是根据需要分布的；这意味着如果一方是状态的 "参与方"，它将在其存储库中存储该状态。
- 考虑到这一点，你只能确保某个特定状态在 "发行方" 层面上不会重复。
- 所以假设在你的 IOU 中总是 "借款人" 发行新的 IOU；因此，你的流程（由 "借款人" 发起）应首先查询 "借款人" 的存储库，查看是否有匹配的 IOU，并在存在时引发异常，否则发行新的 IOU。
- 因此，如果你有一个 "借款人 = PartyA" 且 "借款人 = PartyB" 的 IOU；PartyC 无法知道提到的 IOU 的存在（因为它不是该状态的 "参与方"）。
- 这并不是一个问题，因为你应该以这样的方式编写流程，使流程的发起者成为 IOU 的 "借款人"；这样你就可以确保事情被限制在控制之下。
- 每个 "借款人" 在发行类似 IOU 之前都会检查他们的存储库。
英文:
- In Corda, states are distributed on a need to know basis; meaning if a party is a
participantin the state, it will store that state in its vault. - With that in mind, you can only insure that a certain state is not duplicated on an "issuer" level.
- So let's say in your IOU it's always the
lenderthat issues new IOUs; so your flow (which is initiated by thelender) should first query the vault of thelenderto see if there is a matching IOU and throw an exception if it does, otherwise issue the new IOU. - So if you had an IOU with
lender = PartyAandborrower = PartyB; there's no way for PartyC to know that the mentioned IOU exists (because it's not aparticipantin that state). - Which isn't a problem, because you should write your flow in a way that the initiator of the flow becomes the
lenderof the IOU; and this way you have things locked down. - Every
lenderchecks their vault before issuing an IOU for similar ones.
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