在Corda中，一个事务的输出可以被同一事务中的新事务使用吗? [英] In Corda, can the output of one transaction be used by new transaction in the same flow?

问题描述

按照下面的方案有一个流程.
事务1:输入状态A-合同A产生输出状态B-合同A
交易2:输入状态B-合同A，无输出
在科尔达有可能吗? 请与响应分享一个例子.谢谢.

There is a flow as per below scenario.
Transaction 1: Input StateA - ContractA results in output StateB - ContractA
Transaction 2: Input StateB - ContractA and no output
Is this possible in Corda? Please do share an example with response. Thanks.

推荐答案

是的，这是可能的.例如:

Yes, this is possible. For example:

@InitiatingFlow
@StartableByRPC
class TwoTransactionFlow(val inputStateAndRefA: StateAndRef<StateA>) : FlowLogic<Unit>() {
    @Suspendable
    override fun call() {
        val notary = serviceHub.networkMapCache.notaryIdentities[0]

        // Creating, signing and finalising the first transaction.
        val txBuilderOne = TransactionBuilder(notary)
                .addInputState(inputStateAndRefA)
                .addOutputState(StateB(), ContractA.ID)
                .addCommand(ContractA.Commands.Transfer(), ourIdentity.owningKey)

        val signedTxOne = serviceHub.signInitialTransaction(txBuilderOne)
        val notarisedTxOne = subFlow(FinalityFlow(signedTxOne))

        // Creating, signing and finalising the second transaction.
        val stateRefB = StateRef(notarisedTxOne.id, 0)
        val stateAndRefB = serviceHub.toStateAndRef<StateB>(stateRefB)

        val transactionBuilderTwo = TransactionBuilder(notary)
                .addInputState(stateAndRefB)
                .addCommand(ContractA.Commands.Exit(), ourIdentity.owningKey)

        val signedTransactionTwo = serviceHub.signInitialTransaction(transactionBuilderTwo)
        subFlow(FinalityFlow(signedTransactionTwo))
    }
}

这篇关于在Corda中，一个事务的输出可以被同一事务中的新事务使用吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！