# 程序包 org.hyperledger.fabric.gateway.spi

This package provides the set of interfaces that enable a Java developer to extend the set of built in handlers for controlling gateway strategies.

请参阅: 说明

- 接口概要
  接口 | 说明
  --- | ---
  Checkpointer | Persists the current block and transactions within that block to enable event listening to be resumed following an application outage.
  CommitHandler | Class to handle waiting for an appropriate number of successful commit events to be received from peers following submit of a transaction to the orderer.
  CommitHandlerFactory | Functional interface describing a factory function for constructing `CommitHandler` instances.
  CommitListener | Implemented by listeners for transaction commit events.
  PeerDisconnectEvent | Event with information relating to a peer disconnect.
  Query | Defines a query and provides methods to evaluate the query on specific peers.
  QueryHandler | Handler responsible for evaluating a given query against appropriate peers.
  QueryHandlerFactory | Functional interface describing a factory function for constructing `QueryHandler` instances.
  WalletStore | Interface for store implementations that provide backing storage for identities in a `Wallet`.

## 程序包org.hyperledger.fabric.gateway.spi的说明

This package provides the set of interfaces that enable a Java developer to extend the set of built in handlers for controlling gateway strategies.

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