org.hyperledger.fabric.gateway.spi

接口 QueryHandler

函数接口:

这是一个函数接口, 因此可用作 lambda 表达式或方法引用的赋值目标。

@FunctionalInterface
public interface QueryHandler

Handler responsible for evaluating a given query against appropriate peers. A single QueryHandler instance will be created for each Network instance so the query handler may maintain instance state across multiple queries.

方法概要

限定符和类型	方法和说明
org.hyperledger.fabric.sdk.ProposalResponse	evaluate(Query query) Called when the result for a given query is required.

方法详细资料

evaluate

org.hyperledger.fabric.sdk.ProposalResponse evaluate(Query query)
                                              throws ContractException

Called when the result for a given query is required.

参数:

query - The query to evaluate.

返回:

The query result.

抛出:

ContractException - if no peers are reachable or an error response is returned.