Replicator的功能

• 提供在J2EE服务器平台上运行的企业数据库，J2EE/J2SE平台上运行的工作组数据库与和J2SE/J2ME 平台上的 Java－enabled移动设备之间的数据同步功能。
• 独立的同步平台：100%的Java客户与服务器组件。
• 由客户端初始化同步进程的数据库到数据库的同步双向数据库。
• 具有Publisher（服务器）和Subscriber（客户）体系结构的发布订阅模型
• 无需安装Daffodil DB
• Replicator工作模型
• 符合发布与订阅

　　发布（由开发者定义的一个或多个表的集合）和订阅（Publisher上特定发布的一个子集）允许Publisher发布数据给一个或多个Subscribers，在那里Replication服务器在预定义的端口上扮演监听者的角色并且Subscribers进行周期性的数据同步请求操作。

Publisher:

• Publisher是Replicator同步网络的基本构建块。每一个Publisher都构成了服务器－客户网络的一部分并且被分配一个唯一的名称。名称同其他的储存在Publisher数据库中的数据也就是关于Publisher的所有相关信息一样被存储在数据库中。

Subscriber:

• Subscribers可订阅Publisher的发行物。
• Replicator Publisher和Replicator Subscriber负责管理数据穿过网络时的同步。Subscribers和Publisher都可以由使用者的程序对象实例来完成与数据同步有关的核心功能。Replication Server API提供调用Publisher和Subscriber的方法，这些方法能够使Subscriber完成同步操作。

Replicator Features

• Data Synchronization between enterprise databases running on J2EE server platforms, workgroup databases running on J2EE/J2SE platforms and Java-enabled mobile devices running on J2SE/J2ME platforms
• Platform independent synchronization: 100% Java client and server components.
• Database-to-Database bidirectional data synchronization with client-side initiating the synchronization process.
• Publish and Subscribe model with a Publisher (Server) and Subscriber (Client) architecture.
• No need for Daffodil DB installation.
• Replicator working model

Conformation to Publication and Subscription

• The Publication ( collection of one or more tables defined by developers) and Subscription (a subset of a particular publication on a Publisher) allows a Publisher to publish data to one or more Subscribers where Replication server enacts the role of a listener on a pre-defined communication port and the Subscriber makes periodic requests for data synchronization operations.

Publisher

• Publishers are the basic building blocks of a Replicator's synchronization network . Each publisher forms part of a server-client network and is assigned a unique name. The name as well as the other concerned data of each publisher are stored in the publisher database i.e. all relevant information about the publishers, is stored in a database.

Subscriber

• Subscriber subscribes to Publisher's publications.
• Replicator Publisher and Replicator Subscriber are responsible for managing the synchronization of data across the network. Both the Publisher and Subscriber are objects instantiated by user applications and perform the core functions associated with the synchronization of data. The Replication Server API gives method calls to Publisher and Subscriber, which enable Subscriber to perform synchronization operations.