我可以解析来自 CordaRPCOps 的指针吗？

Question

考虑以下几点：

data class ChildState(
   val name: Party,
        override val linearId : UniqueIdentifier = UniqueIdentifier()
) : LinearState
data class ParentState(
        val name : Party,
        val children : LinearPointer<ChildState>,
        override val linearId : UniqueIdentifier = UniqueIdentifier()
) : LinearState

我能否像 this Mathew Lyton post 似乎建议的那样，使用 CordaRPCOps 从模块外部获取仅查询父级的子状态？像这样：

// rpc.proxy is a NodeRPCConnection containing the CordaRPCOps
val parentStateData = rpc.proxy.vaultQueryBy<ParentState>().states.single().state.data

// perhaps something like this?
parentStateData.children.resolve(rpc.proxy)

Answer 1

Corda 中 StatePointer 的默认实现不支持使用 CordaRPCOps 解析指针。它只能使用 ServiceHub 或 LedgerTransation 来解决。以下是 Corda 中 StatePointer class 中定义的方法。

/**
 * Resolves a [StatePointer] to a [StateAndRef] via a vault query. This method will either return a [StateAndRef]
 * or return an exception.
 *
 * @param services a [ServiceHub] implementation is required to resolve the pointer.
 */
@DeleteForDJVM
abstract fun resolve(services: ServiceHub): StateAndRef<T>

/**
 * Resolves a [StatePointer] to a [StateAndRef] from inside a [LedgerTransaction]. The intuition here is that all
 * of the pointed-to states will be included in the transaction as reference states.
 *
 * @param ltx the [LedgerTransaction] containing the [pointer] and pointed-to states.
 */
abstract fun resolve(ltx: LedgerTransaction): StateAndRef<T>

在 rpc 客户端中 ServiceHub 和 LedgerTransaction 都不可访问，因此为了使用 CordaRPCOps 解析指针，您需要编写一个自定义实现作为在你提到的 blog 中描述。

我可以解析来自 CordaRPCOps 的指针吗？

Can I resolve pointer from CordaRPCOps?

corda