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

Class SeriesReader

java.lang.Object

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

Direct Known Subclasses:

AlignedSeriesReader

public class SeriesReader
extends java.lang.Object

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	SeriesReader.TimeOrderUtils

Field Summary

Fields

Modifier and Type	Field	Description
protected java.util.Set<java.lang.String>	allSensors
protected org.apache.iotdb.tsfile.read.common.BatchData	cachedBatchData
protected java.util.PriorityQueue<org.apache.iotdb.tsfile.file.metadata.IChunkMetadata>	cachedChunkMetadata
protected QueryContext	context
protected int	curSeqFileIndex
protected int	curUnseqFileIndex
protected QueryDataSource	dataSource
protected org.apache.iotdb.tsfile.file.metadata.enums.TSDataType	dataType
protected TsFileFilter	fileFilter
protected org.apache.iotdb.tsfile.file.metadata.IChunkMetadata	firstChunkMetadata
protected org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader	firstPageReader
protected org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata	firstTimeSeriesMetadata
protected boolean	hasCachedNextOverlappedPage
protected PriorityMergeReader	mergeReader
protected SeriesReader.TimeOrderUtils	orderUtils
protected java.util.List<org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader>	seqPageReaders
protected java.util.List<org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata>	seqTimeSeriesMetadata
protected org.apache.iotdb.commons.path.PartialPath	seriesPath
protected org.apache.iotdb.tsfile.read.filter.basic.Filter	timeFilter
protected java.util.PriorityQueue<org.apache.iotdb.db.query.reader.series.SeriesReader.VersionPageReader>	unSeqPageReaders
protected java.util.PriorityQueue<org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata>	unSeqTimeSeriesMetadata
protected org.apache.iotdb.tsfile.read.filter.basic.Filter	valueFilter

Constructor Summary

Constructors

Constructor	Description
SeriesReader(org.apache.iotdb.commons.path.PartialPath seriesPath, java.util.Set<java.lang.String> allSensors, org.apache.iotdb.tsfile.file.metadata.enums.TSDataType dataType, QueryContext context, java.util.List<TsFileResource> seqFileResource, java.util.List<TsFileResource> unseqFileResource, org.apache.iotdb.tsfile.read.filter.basic.Filter timeFilter, org.apache.iotdb.tsfile.read.filter.basic.Filter valueFilter, boolean ascending)
SeriesReader(org.apache.iotdb.commons.path.PartialPath seriesPath, java.util.Set<java.lang.String> allSensors, org.apache.iotdb.tsfile.file.metadata.enums.TSDataType dataType, QueryContext context, QueryDataSource dataSource, org.apache.iotdb.tsfile.read.filter.basic.Filter timeFilter, org.apache.iotdb.tsfile.read.filter.basic.Filter valueFilter, TsFileFilter fileFilter, boolean ascending)

Method Summary

Modifier and Type	Method	Description
org.apache.iotdb.tsfile.file.metadata.statistics.Statistics	currentFileTimeStatistics()
protected org.apache.iotdb.tsfile.read.filter.basic.Filter	getAnyFilter()
protected DescPriorityMergeReader	getDescPriorityMergeReader()
SeriesReader.TimeOrderUtils	getOrderUtils()
protected PriorityMergeReader	getPriorityMergeReader()
org.apache.iotdb.tsfile.read.filter.basic.Filter	getValueFilter()
boolean	isEmpty()
protected org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata	loadTimeSeriesMetadata(TsFileResource resource, org.apache.iotdb.commons.path.PartialPath seriesPath, QueryContext context, org.apache.iotdb.tsfile.read.filter.basic.Filter filter, java.util.Set<java.lang.String> allSensors)
protected void	tryToUnpackAllOverlappedFilesToTimeSeriesMetadata()	unpack all overlapped seq/unseq files and find the first TimeSeriesMetadata
protected void	unpackAllOverlappedTsFilesToTimeSeriesMetadata(long endpointTime)
protected void	unpackOneTimeSeriesMetadata(org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata timeSeriesMetadata)
protected void	unpackSeqTsFileResource()
protected void	unpackUnseqTsFileResource()

Methods inherited from class java.lang.Object

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

Field Detail

orderUtils

protected SeriesReader.TimeOrderUtils orderUtils

seriesPath

protected final org.apache.iotdb.commons.path.PartialPath seriesPath

allSensors

protected final java.util.Set<java.lang.String> allSensors

dataType

protected final org.apache.iotdb.tsfile.file.metadata.enums.TSDataType dataType

context

protected final QueryContext context

timeFilter

protected final org.apache.iotdb.tsfile.read.filter.basic.Filter timeFilter

valueFilter

protected final org.apache.iotdb.tsfile.read.filter.basic.Filter valueFilter

fileFilter

protected final TsFileFilter fileFilter

dataSource

protected final QueryDataSource dataSource

curSeqFileIndex

protected int curSeqFileIndex

curUnseqFileIndex

protected int curUnseqFileIndex

firstTimeSeriesMetadata

protected org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata firstTimeSeriesMetadata

seqTimeSeriesMetadata

protected final java.util.List<org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata> seqTimeSeriesMetadata

unSeqTimeSeriesMetadata

protected final java.util.PriorityQueue<org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata> unSeqTimeSeriesMetadata

firstChunkMetadata

protected org.apache.iotdb.tsfile.file.metadata.IChunkMetadata firstChunkMetadata

cachedChunkMetadata

protected final java.util.PriorityQueue<org.apache.iotdb.tsfile.file.metadata.IChunkMetadata> cachedChunkMetadata

firstPageReader

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

seqPageReaders

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

unSeqPageReaders

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

mergeReader

protected final PriorityMergeReader mergeReader

hasCachedNextOverlappedPage

protected boolean hasCachedNextOverlappedPage

cachedBatchData

protected org.apache.iotdb.tsfile.read.common.BatchData cachedBatchData

Constructor Detail

SeriesReader

public SeriesReader(org.apache.iotdb.commons.path.PartialPath seriesPath,
                    java.util.Set<java.lang.String> allSensors,
                    org.apache.iotdb.tsfile.file.metadata.enums.TSDataType dataType,
                    QueryContext context,
                    QueryDataSource dataSource,
                    org.apache.iotdb.tsfile.read.filter.basic.Filter timeFilter,
                    org.apache.iotdb.tsfile.read.filter.basic.Filter valueFilter,
                    TsFileFilter fileFilter,
                    boolean ascending)

Parameters:

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(org.apache.iotdb.commons.path.PartialPath seriesPath,
                    java.util.Set<java.lang.String> allSensors,
                    org.apache.iotdb.tsfile.file.metadata.enums.TSDataType dataType,
                    QueryContext context,
                    java.util.List<TsFileResource> seqFileResource,
                    java.util.List<TsFileResource> unseqFileResource,
                    org.apache.iotdb.tsfile.read.filter.basic.Filter timeFilter,
                    org.apache.iotdb.tsfile.read.filter.basic.Filter valueFilter,
                    boolean ascending)

Method Detail

getPriorityMergeReader

protected PriorityMergeReader getPriorityMergeReader()

getDescPriorityMergeReader

protected DescPriorityMergeReader getDescPriorityMergeReader()

isEmpty

public boolean isEmpty()
                throws java.io.IOException

Throws:

java.io.IOException

currentFileTimeStatistics

public org.apache.iotdb.tsfile.file.metadata.statistics.Statistics currentFileTimeStatistics()
                                                                                      throws java.io.IOException

Throws:

java.io.IOException

unpackOneTimeSeriesMetadata

protected void unpackOneTimeSeriesMetadata(org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata timeSeriesMetadata)
                                    throws java.io.IOException

Throws:

java.io.IOException

tryToUnpackAllOverlappedFilesToTimeSeriesMetadata

protected void tryToUnpackAllOverlappedFilesToTimeSeriesMetadata()
                                                          throws java.io.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

Throws:

java.io.IOException

unpackAllOverlappedTsFilesToTimeSeriesMetadata

protected void unpackAllOverlappedTsFilesToTimeSeriesMetadata(long endpointTime)
                                                       throws java.io.IOException

Throws:

java.io.IOException

unpackSeqTsFileResource

protected void unpackSeqTsFileResource()
                                throws java.io.IOException

Throws:

java.io.IOException

unpackUnseqTsFileResource

protected void unpackUnseqTsFileResource()
                                  throws java.io.IOException

Throws:

java.io.IOException

loadTimeSeriesMetadata

protected org.apache.iotdb.tsfile.file.metadata.ITimeSeriesMetadata loadTimeSeriesMetadata(TsFileResource resource,
                                                                                           org.apache.iotdb.commons.path.PartialPath seriesPath,
                                                                                           QueryContext context,
                                                                                           org.apache.iotdb.tsfile.read.filter.basic.Filter filter,
                                                                                           java.util.Set<java.lang.String> allSensors)
                                                                                    throws java.io.IOException

Throws:

java.io.IOException

getAnyFilter

protected org.apache.iotdb.tsfile.read.filter.basic.Filter getAnyFilter()

getOrderUtils

public SeriesReader.TimeOrderUtils getOrderUtils()

getValueFilter

public org.apache.iotdb.tsfile.read.filter.basic.Filter getValueFilter()