org.apache.iotdb.db.query.reader.series

类 SeriesReader

java.lang.Object

org.apache.iotdb.db.query.reader.series.SeriesReader

直接已知子类:

AlignedSeriesReader

public class SeriesReader
extends Object

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	SeriesReader.TimeOrderUtils

字段概要

字段

限定符和类型	字段和说明
protected Set<String>	allSensors
protected BatchData	cachedBatchData
protected PriorityQueue<IChunkMetadata>	cachedChunkMetadata
protected QueryContext	context
protected int	curSeqFileIndex
protected int	curUnseqFileIndex
protected QueryDataSource	dataSource
protected TSDataType	dataType
protected TsFileFilter	fileFilter
protected IChunkMetadata	firstChunkMetadata
protected org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader	firstPageReader
protected ITimeSeriesMetadata	firstTimeSeriesMetadata
protected boolean	hasCachedNextOverlappedPage
protected PriorityMergeReader	mergeReader
protected SeriesReader.TimeOrderUtils	orderUtils
protected List<org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader>	seqPageReaders
protected List<ITimeSeriesMetadata>	seqTimeSeriesMetadata
protected PartialPath	seriesPath
protected Filter	timeFilter
protected PriorityQueue<org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader>	unSeqPageReaders
protected PriorityQueue<ITimeSeriesMetadata>	unSeqTimeSeriesMetadata
protected Filter	valueFilter

构造器概要

构造器

构造器和说明
SeriesReader(PartialPath seriesPath, Set<String> allSensors, TSDataType dataType, QueryContext context, List<TsFileResource> seqFileResource, List<TsFileResource> unseqFileResource, Filter timeFilter, Filter valueFilter, boolean ascending)
SeriesReader(PartialPath seriesPath, Set<String> allSensors, TSDataType dataType, QueryContext context, QueryDataSource dataSource, Filter timeFilter, Filter valueFilter, TsFileFilter fileFilter, boolean ascending)

方法概要

限定符和类型	方法和说明
Statistics	currentFileTimeStatistics()
protected Filter	getAnyFilter()
protected DescPriorityMergeReader	getDescPriorityMergeReader()
SeriesReader.TimeOrderUtils	getOrderUtils()
protected PriorityMergeReader	getPriorityMergeReader()
Filter	getValueFilter()
boolean	isEmpty()
protected ITimeSeriesMetadata	loadTimeSeriesMetadata(TsFileResource resource, PartialPath seriesPath, QueryContext context, Filter filter, Set<String> allSensors)
protected void	tryToUnpackAllOverlappedFilesToTimeSeriesMetadata() unpack all overlapped seq/unseq files and find the first TimeSeriesMetadata Because there may be too many files in the scenario used by the user, we cannot open all the chunks at once, which may cause OOM, so we can only unpack one file at a time when needed.
protected void	unpackAllOverlappedTsFilesToTimeSeriesMetadata(long endpointTime)
protected void	unpackOneTimeSeriesMetadata(ITimeSeriesMetadata timeSeriesMetadata)
protected void	unpackSeqTsFileResource()
protected void	unpackUnseqTsFileResource()

从类继承的方法 java.lang.Object

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

字段详细资料

orderUtils

protected SeriesReader.TimeOrderUtils orderUtils

seriesPath

protected final PartialPath seriesPath

allSensors

protected final Set<String> allSensors

dataType

protected final TSDataType dataType

context

protected final QueryContext context

timeFilter

protected final Filter timeFilter

valueFilter

protected final Filter valueFilter

fileFilter

protected final TsFileFilter fileFilter

dataSource

protected final QueryDataSource dataSource

curSeqFileIndex

protected int curSeqFileIndex

curUnseqFileIndex

protected int curUnseqFileIndex

firstTimeSeriesMetadata

protected ITimeSeriesMetadata firstTimeSeriesMetadata

seqTimeSeriesMetadata

protected final List<ITimeSeriesMetadata> seqTimeSeriesMetadata

unSeqTimeSeriesMetadata

protected final PriorityQueue<ITimeSeriesMetadata> unSeqTimeSeriesMetadata

firstChunkMetadata

protected IChunkMetadata firstChunkMetadata

cachedChunkMetadata

protected final PriorityQueue<IChunkMetadata> cachedChunkMetadata

firstPageReader

protected org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader firstPageReader

seqPageReaders

protected final List<org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader> seqPageReaders

unSeqPageReaders

protected final PriorityQueue<org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader> unSeqPageReaders

mergeReader

protected final PriorityMergeReader mergeReader

hasCachedNextOverlappedPage

protected boolean hasCachedNextOverlappedPage

cachedBatchData

protected BatchData cachedBatchData

构造器详细资料

SeriesReader

public SeriesReader(PartialPath seriesPath,
                    Set<String> allSensors,
                    TSDataType dataType,
                    QueryContext context,
                    QueryDataSource dataSource,
                    Filter timeFilter,
                    Filter valueFilter,
                    TsFileFilter fileFilter,
                    boolean ascending)

参数:

seriesPath - For querying aligned series, the seriesPath should be AlignedPath. All selected series belonging to one aligned device should be all in this one AlignedPath's measurementList.

allSensors - For querying aligned series, allSensors are not used.

SeriesReader

public SeriesReader(PartialPath seriesPath,
                    Set<String> allSensors,
                    TSDataType dataType,
                    QueryContext context,
                    List<TsFileResource> seqFileResource,
                    List<TsFileResource> unseqFileResource,
                    Filter timeFilter,
                    Filter valueFilter,
                    boolean ascending)

方法详细资料

getPriorityMergeReader

protected PriorityMergeReader getPriorityMergeReader()

getDescPriorityMergeReader

protected DescPriorityMergeReader getDescPriorityMergeReader()

isEmpty

public boolean isEmpty()
                throws IOException

抛出:

IOException

currentFileTimeStatistics

public Statistics currentFileTimeStatistics()
                                     throws IOException

抛出:

IOException

unpackOneTimeSeriesMetadata

protected void unpackOneTimeSeriesMetadata(ITimeSeriesMetadata timeSeriesMetadata)
                                    throws IOException

抛出:

IOException

tryToUnpackAllOverlappedFilesToTimeSeriesMetadata

protected void tryToUnpackAllOverlappedFilesToTimeSeriesMetadata()
                                                          throws IOException

unpack all overlapped seq/unseq files and find the first TimeSeriesMetadata

Because there may be too many files in the scenario used by the user, we cannot open all the chunks at once, which may cause OOM, so we can only unpack one file at a time when needed. This approach is likely to be ubiquitous, but it keeps the system running smoothly

抛出:

IOException

unpackAllOverlappedTsFilesToTimeSeriesMetadata

protected void unpackAllOverlappedTsFilesToTimeSeriesMetadata(long endpointTime)
                                                       throws IOException

抛出:

IOException

unpackSeqTsFileResource

protected void unpackSeqTsFileResource()
                                throws IOException

抛出:

IOException

unpackUnseqTsFileResource

protected void unpackUnseqTsFileResource()
                                  throws IOException

抛出:

IOException

loadTimeSeriesMetadata

protected ITimeSeriesMetadata loadTimeSeriesMetadata(TsFileResource resource,
                                                     PartialPath seriesPath,
                                                     QueryContext context,
                                                     Filter filter,
                                                     Set<String> allSensors)
                                              throws IOException

抛出:

IOException

getAnyFilter

protected Filter getAnyFilter()

getOrderUtils

public SeriesReader.TimeOrderUtils getOrderUtils()

getValueFilter

public Filter getValueFilter()