EDOBE XDOM PMML Uživatelský manuál stáhnout pdf (Strana 21)

GRAPHICAL USER INTERFACE CLASSES

Overview Spotfire Miner is structured as a client/server application. Each

component such as a Read File node has a corresponding

ActivityNodeModel object on the client, and an EngineNode object on

the server.

The

ActivityNodeModel keeps track of the node properties and reacts

to requests to check the node status, show the properties, and show

the viewer.

The

EngineNode gets the properties from the ActivityNodeModel, gets

data from the pipeline, does the actual computation, outputs data to

the pipeline, and stores any necessary view information in a standard

location that

ActivityNodeModel can access.

The

ActivityNodeModel will typically have helper classes that are

used to show a properties dialog and perhaps a custom viewer.

A key element of the architecture is that any information needed by

the engine is stored in an XML structure that can be retrieved from

the

ActivityNodeModel, and any information needed by the

ActivityNodeModel for viewing results is stored in an XML cache file

on the engine. Direct method calls between the client and server

classes can not be used as this will not work in a client/server

environment.

Activity Node

Model

Each type of node is completely described in the XML description of

the node in the Explorer or a worksheet. The application creates an

ActivityNodeModel by finding the appropriate class name from the

node’s XML description and using reflection to instantiate a new

object initialized based on the other elements in the XML

description.

Typically a new class that extends

ActivityNodeModel will be created

for each new type of node. For instance, the Read Text File node

uses a

ReadTextFileNodeModel.

The important methods that are typically overridden are the methods

to check the state of the node, show the properties dialog, and show

the viewer. Model nodes override additional methods used for

prediction, PMML generation, and/or column filter creation.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 97 98

Žádné komentáře

EDOBE XDOM PMML Uživatelský manuál Strana 21