EDOBE XDOM PMML Manual de usuario descargar pdf (Pagina 85)

At a rough level of detail, the pipeline engine works by repeatedly

scanning through all of the

CNKProc objects. For each CNKProc, the

engine calls

CNKProc::isReady(). If this returns true (non-zero), then

CNKProc::execute() is called to execute the CNKProc once. The

engine repeatedly processes all of the

CNKProc objects in this way,

until none of them are "ready", indicating that either they are done

processing, or there is a problem.

setDone and isDone access an internal flag, indicating whether the

CNKProc is done processing all of its data, and need never be executed

again. The

execute method would normally call setDone(1) after it

had processed all available data from its inputs, and the input

CNKBuf

objects had all reached their

EOF (according to

CNKBufReader::getEOF()).

The default definition of

execute() does nothing. The default

definition of

isReady() returns true (non-zero) if getError() is NULL,

isDone() is false, and all of the input and output bufs are ready,

meaning that their row requests are satisfied. Creating a new

CNKProc

means at least defining a new

execute() method, and possibly a new

isReady() method. The details of writing an execute() method that

accesses its inputs and outputs correctly is described in a section

below.

CNKProc::

virtual INT64 getRowsDone();

virtual void setRowsDone(INT64 val);

virtual void incrementRowsDone(long rows);

Each CNKProc maintains a field counting the number of rows that

have been processed, initialized to zero in

init(). The current value

is accessed by

getRowsDone(). This value is normally changed by

calls from

execute() to setRowsDone or incrementRowsDone. This

concept is not well defined. In particular, it is unclear what this

means when there are multiple inputs. Currently, this is used

primarily for debugging, to check how much data is flowing through a

CNKProc.

CNKProc::

virtual long getExecuteCount();

virtual void setExecuteCount(long val);

virtual void incrementExecuteCount();

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 97 98

Comentarios a estos manuales

Sin comentarios

EDOBE XDOM PMML Manual de usuario Pagina 85

Comentarios a estos manuales