public interface HistoryQueryExecutor
Modifier and Type | Method and Description |
---|---|
void |
endReading()
If startReading was called, this function must be called (that is, it should be in a finally
block).
|
java.util.List<? extends HistoryNode> |
getColumnNodes()
Returns the HistoryNodes of this executor.
|
int |
getEffectiveWindowSizeMS()
When "natural" results are requested, this will be called to let the query executors say what they think
"natural" means.
|
boolean |
hasMore()
Returns TRUE if there is more data available to be written on call to processData()
|
void |
initialize()
Initializes the query, performing any actions necessary to get the information required to run the query.
|
long |
nextTime()
The timestamp of the next value.
|
long |
processData()
Puts the next value(s) into the appropriate column, returning the latest timestamp loaded, or -1 if no data was
loaded.
|
void |
startReading()
Begins reading data.
|
void initialize() throws java.lang.Exception
java.lang.Exception
java.util.List<? extends HistoryNode> getColumnNodes()
int getEffectiveWindowSizeMS()
void startReading() throws java.lang.Exception
java.lang.Exception
void endReading()
boolean hasMore()
long nextTime()
long processData() throws java.lang.Exception
java.lang.Exception