Package org.apache.iotdb.db.metadata.lastCache

Class LastCacheManager

java.lang.Object

org.apache.iotdb.db.metadata.lastCache.LastCacheManager

public class LastCacheManager
extends java.lang.Object

Constructor Summary

Constructors

Constructor	Description
LastCacheManager()

Method Summary

Modifier and Type	Method	Description
static void	deleteLastCacheByDevice(IEntityMNode node)	delete all the last cache value of any timeseries or aligned timeseries under the entity
static void	deleteLastCacheByDevice(IEntityMNode node, org.apache.iotdb.commons.path.PartialPath originalPath, long startTime, long endTime)	delete the last cache value of timeseries or subMeasurement of some aligned timeseries, which is under the entity and matching the originalPath
static org.apache.iotdb.tsfile.read.TimeValuePair	getLastCache(IMeasurementMNode node)	get the last cache value of time series of given seriesPath
static long	getLastTimeStamp(IMeasurementMNode node, QueryContext queryContext)	get the last value of timeseries represented by given measurementMNode get last value from cache in measurementMNode if absent, get last value from file
static void	resetLastCache(IMeasurementMNode node)	reset the last cache value of time series of given seriesPath
static void	updateLastCache(IMeasurementMNode node, org.apache.iotdb.tsfile.read.TimeValuePair timeValuePair, boolean highPriorityUpdate, java.lang.Long latestFlushedTime)	update the last cache value of time series of given seriesPath

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LastCacheManager

public LastCacheManager()

Method Detail

getLastCache

public static org.apache.iotdb.tsfile.read.TimeValuePair getLastCache(IMeasurementMNode node)

get the last cache value of time series of given seriesPath

Parameters:

node - the measurementMNode holding the lastCache When invoker only has the target seriesPath, the node could be null and SchemaProcessor will search the node

Returns:

the last cache value

updateLastCache

public static void updateLastCache(IMeasurementMNode node,
                                   org.apache.iotdb.tsfile.read.TimeValuePair timeValuePair,
                                   boolean highPriorityUpdate,
                                   java.lang.Long latestFlushedTime)

update the last cache value of time series of given seriesPath

Parameters:

node - the measurementMNode holding the lastCache When invoker only has the target seriesPath, the node could be null and SchemaProcessor will search the node

timeValuePair - the latest point value

highPriorityUpdate - the last value from insertPlan is high priority

latestFlushedTime - latest flushed time

resetLastCache

public static void resetLastCache(IMeasurementMNode node)

reset the last cache value of time series of given seriesPath

Parameters:

node - the measurementMNode holding the lastCache When invoker only has the target seriesPath, the node could be null and SchemaProcessor will search the node

deleteLastCacheByDevice

public static void deleteLastCacheByDevice(IEntityMNode node)

delete all the last cache value of any timeseries or aligned timeseries under the entity

Parameters:

node - entity node

deleteLastCacheByDevice

public static void deleteLastCacheByDevice(IEntityMNode node,
                                           org.apache.iotdb.commons.path.PartialPath originalPath,
                                           long startTime,
                                           long endTime)

delete the last cache value of timeseries or subMeasurement of some aligned timeseries, which is under the entity and matching the originalPath

Parameters:

node - entity node

originalPath - origin timeseries path

startTime - startTime

endTime - endTime

getLastTimeStamp

public static long getLastTimeStamp(IMeasurementMNode node,
                                    QueryContext queryContext)

get the last value of timeseries represented by given measurementMNode get last value from cache in measurementMNode if absent, get last value from file

Parameters:

node - measurementMNode representing the target timeseries

queryContext - query context

Returns:

the last value