EDOBE XDOM PMML Manual de usuario descargar pdf (Pagina 78)

releaseAll() should be called when the reader is no longer

interested in reading this data. After calling

releaseAll(), no

requests will be satisfied. This method allows a reader to "disconnect"

from the buf. This is needed for multipass or random-access readers,

to tell the buf that they are through reading, since it isn't enough that

EOF has been reached. This should be called from streaming readers,

too, when they set themselves "done", in case there are other

resources that can be released.

CNKBufReader::

virtual INT64 getChunkPosition();

At any time, a CNKBufReader can access a "chunk" of data rows from a

potentially-very-large series of data rows.

getChunkPosition returns

the row number of the first row in the chunk, counted from the start

of the series when

CNKBuf::init() was called. If the data is being

read sequentially, this value is the same as the sum of all

releaseRows

calls since

CNKBuf::init() was last called.

CNKBufReader::

virtual void setChunkPosition(INT64 where);

The setChunkPosition method sets the position of the beginning of

the current chunk. This may change the value returned by

getRowsReady(). For random-access bufs, this can be set to any value,

forward or backward. For multi-pass bufs, this can be set forward, or

0 to reset the stream. Setting this backwards (except to 0) will

cause a buf error. For normal sequential streaming bufs, setting this

backwards will cause a buf error.

For any type of access,

setChunkPosition can be used to skip ahead

in the data stream. To skip forward to the

EOF, call

setChunkPosition(max_int64).

CNKBufReader::

virtual int isMultiPass();

virtual int isRandomAccess();

These methods return non-zero if this CNKBufReader CNKBuf supports

multi-pass access, or random-access.

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EDOBE XDOM PMML Manual de usuario Pagina 78