EDOBE XDOM PMML Manual do Utilizador descarregar pdf (Página 84)

After inputs and outputs have been created, they can be accessed with

getInputBuf and getOutputBuf (returning the linked CNKBuf objects),

and

getInputBufReader and getOutputBufWriter (returning the

CNKBufReader or CNKBufWriter objects for the link). These methods

check the validity of their index argument: if the index is invalid, they

will return

NULL.

CNKProc::

virtual void setNumRows(long val);

virtual long getNumRows();

virtual void setOutputNumRows(long val);

virtual long getOutputNumRows();

CNKProc

maintains two properties, the maximum number of rows that

will be requested from any of its inputs (accessed with

set/

getNumRows

), and the maximum number of rows spaces that will be

requested from any of its outputs (accessed with

set/

getOutputNumRows

). These properties should be set when a CNKProc is

created. The values of these properties are used by

CNKBuf::getMinRowsToAvoidDeadlock() and

CNKBuf::isDeadlockPossible() to determine whether the CNKBuf is

large enough to avoid deadlock during pipeline execution.

Many

CNKProc objects take an input chunk, process it, and write an

output chunk with the same number of rows. In cases like these, the

getOutputNumRows value should be the same as the getNumRows value.

To handle this case more easily, if the

"OutputNumRows" value is less

than zero (the default),

getOutputNumRows() will simply return the

value of

getNumRows(). Therefore, many CNKProc objects will only

need to call

setNumRows.

CNKProc::

virtual void execute();

virtual int isReady();

virtual void setDone(int val);

virtual int isDone();

These methods determine how the pipeline engine executes the

CNKBuf. Derived classes redefine CNKProc::execute(), and possibly

the other methods, to implement their particular data processing

behavior. This set of methods is deliberately small, to make it easier

to define new components.

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