Package org.apache.iotdb.db.engine.compaction.inner.utils

Class MultiTsFileDeviceIterator

java.lang.Object

org.apache.iotdb.db.engine.compaction.inner.utils.MultiTsFileDeviceIterator

All Implemented Interfaces:

java.lang.AutoCloseable

public class MultiTsFileDeviceIterator
extends java.lang.Object
implements java.lang.AutoCloseable

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	MultiTsFileDeviceIterator.AlignedMeasurementIterator
class	MultiTsFileDeviceIterator.MeasurementIterator

Constructor Summary

Constructors

Constructor	Description
MultiTsFileDeviceIterator(java.util.List<TsFileResource> tsFileResources)	Used for inner space compaction.
MultiTsFileDeviceIterator(java.util.List<TsFileResource> seqResources, java.util.List<TsFileResource> unseqResources)	Used for cross space compaction.

Method Summary

Modifier and Type	Method	Description
void	close()
java.util.LinkedList<org.apache.iotdb.tsfile.utils.Pair<org.apache.iotdb.tsfile.read.TsFileSequenceReader,java.util.List<org.apache.iotdb.tsfile.file.metadata.AlignedChunkMetadata>>>	getReaderAndChunkMetadataForCurrentAlignedSeries()	return a list of the tsfile reader and its aligned chunk metadata list for the aligned device which this iterator is visiting.
boolean	hasNextDevice()
MultiTsFileDeviceIterator.AlignedMeasurementIterator	iterateAlignedSeries(java.lang.String device)
MultiTsFileDeviceIterator.MeasurementIterator	iterateNotAlignedSeries(java.lang.String device, boolean derserializeTimeseriesMetadata)	return MeasurementIterator, who iterates the measurements of not aligned device
org.apache.iotdb.tsfile.utils.Pair<java.lang.String,java.lang.Boolean>	nextDevice()	Return next device that is minimal in lexicographical order

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiTsFileDeviceIterator

public MultiTsFileDeviceIterator(java.util.List<TsFileResource> tsFileResources)
                          throws java.io.IOException

Used for inner space compaction.

Throws:

java.io.IOException

MultiTsFileDeviceIterator

public MultiTsFileDeviceIterator(java.util.List<TsFileResource> seqResources,
                                 java.util.List<TsFileResource> unseqResources)
                          throws java.io.IOException

Used for cross space compaction.

Throws:

java.io.IOException

Method Detail

hasNextDevice

public boolean hasNextDevice()

nextDevice

public org.apache.iotdb.tsfile.utils.Pair<java.lang.String,java.lang.Boolean> nextDevice()

Return next device that is minimal in lexicographical order

Returns:

Pair of device full path and whether this device is aligned

iterateNotAlignedSeries

public MultiTsFileDeviceIterator.MeasurementIterator iterateNotAlignedSeries(java.lang.String device,
                                                                             boolean derserializeTimeseriesMetadata)
                                                                      throws java.io.IOException

return MeasurementIterator, who iterates the measurements of not aligned device

Parameters:

device - the full path of the device to be iterated

Returns:

Throws:

java.io.IOException

iterateAlignedSeries

public MultiTsFileDeviceIterator.AlignedMeasurementIterator iterateAlignedSeries(java.lang.String device)

getReaderAndChunkMetadataForCurrentAlignedSeries

public java.util.LinkedList<org.apache.iotdb.tsfile.utils.Pair<org.apache.iotdb.tsfile.read.TsFileSequenceReader,java.util.List<org.apache.iotdb.tsfile.file.metadata.AlignedChunkMetadata>>> getReaderAndChunkMetadataForCurrentAlignedSeries()
                                                                                                                                                                                                                                              throws java.io.IOException

return a list of the tsfile reader and its aligned chunk metadata list for the aligned device which this iterator is visiting. If there is any modification for this device, it will be applied to the AlignedChunkMetadata, so that the user of this function can reader Chunk directly using the reader and the chunkMetadata returned. Notice, if the TsFile corresponding to a TsFileSequenceReader does not contain the current device, the TsFileSequenceReader will not appear in the return list.

Returns:

a list of pair(TsFileSequenceReader, the list of AlignedChunkMetadata for current device)

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.io.IOException