But the question is how can we design this Data Service Layer? Fred sees 3 different possibilities.
但是问题是，我们如何设计这个数据服务层？
As a single entry point to all enterprise data stores, the implementation of a data service layer has many benefits.
作为所有企业数据存储的单一入口点，实现数据服务层的好处很多。
The software architecture consists of Customer Interface Layer, the Page Service Layer, Applied Interface Layer and the Data Service Layer.
其中软件体系包括了用户界面层、页面服务器层、应用服务群层和数据服务层；
It has to, in effect, introduce a layer of abstraction, allowing for changes in a data layer with no or minimal impact to service implementations.
实际上，它需要引入一个抽象层，以允许数据层的更改而不影响服务实现或将这种影响降到最低。
To improve security, we recommend that you install the index data service in the data layer.
要提高安全性，我们建议您在数据层安装索引数据服务。
Our application has several service layer methods which only deal with database “A” in most instances; however occasionally they also retrieve read-only data from database “B”.
我们的应用程序有多个在大多数情况下只和数据库“A”打交道的服务层方法；它们偶尔也会从数据库“B”中获取只读数据。
Presentation layer objects will depend on service layer objects, which will themselves depend on other service objects and data access objects, etc.
表示层对象会依赖于服务层对象，而这些服务层对象又依赖于其它服务对象和数据访问对象等。
After the integration layer receives the message payload, it checks with its orchestration service to see which systems are subscribed for the data.
集成层接收到消息有效负载后，将与其协调服务进行联系，确定哪些系统订阅了此数据。
The service layer provides translation between internal and external data structures.
服务层负责内部与外部数据结构之间的来回转换。
You can use Business Objects, extensions of Service Data Objects (SDO), to provide an abstraction layer for data access.
可以使用业务对象（服务数据对象 (SDO)的扩展）为数据访问提供抽象层。
The client service layer defines the implementation classes responsible for taking the data passed from the dashboard, creating the request objects, and invoking a specified simulator service.
客户端服务层定义了具体的实现类，负责从指示板传递数据、生成请求对象和调用特定的模拟器服务。
The role of a service implementation is to enforce the system of record's integrity, almost as a pure data access layer.
服务的实现目标是强化整个系统的集成能力；每个服务，本质上都可以看作是一个纯粹的数据接口层。
The dashboard layer contains the user interface components used to gather the data that the client service layer uses to generate the request objects.
指示板层含有用户接口组件，用来收集数据供客户端服务层生成请求对象。
If you are required to display a collection of data retrieved from the service layer on this page, there is just no good opportunity in the JSF life cycle to fetch the data.
如果需要在该页面上显示从服务层获得的一组数据，那么在JSF生命周期中始终没有好的机会来取数据。
The integration layer ACTS as an intermediary service for the data transaction.
集成层充当数据事务的中间层服务。
The location service receives the collection of DTO objects from the data layer and generates the corresponding JSON data for use in the presentation layer.
位置服务从数据层接收d TO对象的集合，然后生成对应的JSON数据，在表示层使用。
The following sections describe how to secure a Data Web Service application at the HTTP transport protocol layer and how to hook it into WebSphere's security framework.
接下来的小节描述如何保障DataWebService应用程序在HTTP传输协议层的安全性，以及如何将它连接到WebSphere的安全性框架。
The mediator layer is also defined as part of the Service Data Object (SDO) specification (see Resources).
中介器层也作为Service DataObject (SDO)规范的一部分进行了定义（请参见 参考资料）。
This is a specific implementation of the Repository class for Service Registry, which provides the primary interface to the data access layer.
这个类是服务注册中心Repository类的一个具体实现，它为数据访问层提供了基础的接口。
The data layer is a repository of the XML files that represent the Web service response objects.
数据层是XML文件的储存库，这些文件用来表示Web服务响应对象。
If a service layer method deals with only read-only data, you can mark its transaction as read-only, which is a hint to optimize Hibernate and the underlying JDBC driver.
如果一个服务层方法只处理只读数据，可以将它的事务标为只读，这是优化Hibernate和底层JDBC驱动的一个方法。
The service layer does have one method involving data changes on both databases. Here is the pseudo-code.
服务层上有一个方法设计在两个数据库上执行数据变更。
The persistence of that data is delegated to the Spring-based service layer.
这些数据的持久化委托给基于Spring 的服务层。
For example, data service operations that merely retrieve or update data, without the application of business logic should be permitted to be called directly from the Channel Services layer.
例如，仅仅检索或更新数据的数据服务操作如果没有应用业务逻辑，那么不应该允许直接从Channelservices层调用。
Ajax - Ajax components are used to gather information, communicate to service layer, and present the response data.
ajax—用ajax组件来收集信息、与服务层通信、呈现响应数据。
After the file is retrieved, the Spring BeanFactory consumes the XML file and transforms the data into the defined POJO that will be returned to the simulator service layer.
检索完成后，SpringBeanFactory 将会使用该XML文件并将数据转换成已定义的POJO，后者将被返回给模拟器服务层。
This layer is responsible for interacting with the EIS and returning data back to corresponding EJB web service methods in the format that those methods expect.
这一层负责与EIS进行交互，并以相应的EJBWeb服务方法所期望的格式把数据返回给这些方法。
For each Web service to be tested, a JSP will be created to capture all required data necessary to generate the SOAP request object within the client service layer.
对于要进行测试的每个Web服务，将会创建一个jsp来捕获在客户端服务层内生成SOAP请求对象所需的所有数据。
The data layer consists of defined XML files that will be consumed by the Spring framework and returned as POJOs to the simulator service layer.
数据层包含已定义的XML文件，Spring框架会使用这些文件并作为POJO返回到模拟器服务层。
The service implementation class USES the data access layer directly (ServiceRegistryRepository class) for execution of service.
Service的实现类直接使用数据访问层(serviceregistryrepository类)来执行服务。
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