org.apache.iotdb.db.metadata.lastCache

类 LastCacheManager

java.lang.Object

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

public class LastCacheManager
extends Object

构造器概要

构造器

构造器和说明
LastCacheManager()

方法概要

限定符和类型	方法和说明
static void	checkTTLOnLastCache(IMNode node, long dataTTL)
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, 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 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, TimeValuePair timeValuePair, boolean highPriorityUpdate, Long latestFlushedTime) update the last cache value of time series of given seriesPath

从类继承的方法 java.lang.Object

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

构造器详细资料

LastCacheManager

public LastCacheManager()

方法详细资料

getLastCache

public static TimeValuePair getLastCache(IMeasurementMNode node)

get the last cache value of time series of given seriesPath

参数:

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

返回:

the last cache value

updateLastCache

public static void updateLastCache(IMeasurementMNode node,
                                   TimeValuePair timeValuePair,
                                   boolean highPriorityUpdate,
                                   Long latestFlushedTime)

update the last cache value of time series of given seriesPath

参数:

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

参数:

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

参数:

node - entity node

deleteLastCacheByDevice

public static void deleteLastCacheByDevice(IEntityMNode node,
                                           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

参数:

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

参数:

node - measurementMNode representing the target timeseries

queryContext - query context

返回:

the last value

checkTTLOnLastCache

public static void checkTTLOnLastCache(IMNode node,
                                       long dataTTL)