EDOBE XDOM PMML Manual de usuario descargar pdf (Pagina 26)

Output Meta

Data

The calculateOutputMetaData() method is called to determine the

names and types of the output columns. The pipeline takes care of

computing the numerical summaries.

This method will often use

getInputMetaData() to find out about the

inputs and

getNodeProperties() to find out about the properties.

This information is then used to determine the output information.

This method may be called before the data has been read, and should

be able to handle this case properly.

CNKProc

Objects

The CNKProc object provides the connection to the pipeline. The

pipeline can be thought of as having a series of procedures (procs)

connected by buffers. Each procedure is represented by a

CNKProc

object. This object has methods for obtaining property values, getting

data from input buffers, and writing data to output buffers. Running a

component consists of the pipeline repeatedly telling the

CNKProc

object to access the input buffers and use the contents of the buffers to

create new values and write them to the output buffers.

Java Procs If the computation is to be performed in Java, a

CNKProcJavaTransform object is used. This provides a wide variety of

methods for marshalling data back and forth between the C++-level

pipeline code and Java code.

The

setExecObject() method of this object is used to indicate a Java

class implementing the

CNKProcJavaTransformExec interface to

perform the actual computation. This interface has a single

execute()

method that is called once for each block of data.

public void execute(CNKProcJavaTransform proc);

Often the EngineNode will itself implement this interface, with the

computation for each block performed by its

execute() method.

A typical

procCreate() call for this case is of the form:

public CNKProc procCreate() throws Exception {

CNKProcJavaTransform proc = new CNKProcJavaTransform();

proc.setExecObject(this);

return(proc);

}

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