六、OpenDaylight应用基础开发（DataStore）

最新推荐文章于 2021-10-21 15:11:13 发布

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最新推荐文章于 2021-10-21 15:11:13 发布 · 985 阅读

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本文档详细介绍了OpenDaylight中的DataStore概念，包括DataTree、OperationalDataTree和ConfigurationDataTree等。文章重点阐述了基于事务的读写操作，如ReadOnlyTransaction和WriteTransaction的使用，并讨论了DataStore的数据变更通知机制。此外，还探讨了事务链的设计初衷、实现原理及其实现接口。最后，提供了实践练习，涉及监听网络设备状态和通过写库方式下发流表规则。

1 DataStore相关概念

ODL社区实现的内存数据库，其存储的数据结构是由YANG定义的树状的结构
基于事务的访问与操作
支持数据变更通知
支持事务链
DataStore is an intelligent in-memory cache with tree-like structures that would be able to track dependencies, calculate change sets and maintain the relationships between commit handlers, notification listeners and the actual data.）

几个基本概念

Data Tree-All state-related data are modeled and represented as data tree, with possibility to address any element / subtree
1. Operational Data Tree - Reported state of the system, published by the providers using MD-SAL. Represents a feedback loop for applications to observe state of the network / system.
2. Configuration Data Tree - Intended state of the system or network, populated by consumers, which expresses their intention.
Instance Identifier
1. Unique identifier of node / subtree in data tree, which provides unambiguous information, how to reference and retrieve node / subtree from conceptual data trees.
2. Transaction - MD-SAL Data Broker provides transactional access to conceptual data trees representing configuration and operational state.

2 DataStore基于简单事务的读写操作

2.1 访问DataStore

 <reference id="dataBroker"
    interface="org.opendaylight.controller.md.sal.binding.api.DataBroker"
    odl:type="default" />

获取到OSGI的DataBroker服务接口

2.2 DataBroker服务接口

public interface DataBroker extends DataTreeChangeService {
   
   
    ReadOnlyTransaction newReadOnlyTransaction(

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