Package org.apache.iotdb.db.query.externalsort

Class SimpleExternalSortEngine

java.lang.Object

org.apache.iotdb.db.query.externalsort.SimpleExternalSortEngine

All Implemented Interfaces:

ExternalSortJobEngine

public class SimpleExternalSortEngine
extends java.lang.Object
implements ExternalSortJobEngine

Method Summary

Modifier and Type	Method	Description
org.apache.iotdb.db.query.externalsort.ExternalSortJob	createJob(long queryId, java.util.List<ChunkReaderWrap> readerWrapList)	Create an external sort job which merges many chunks.
java.util.List<IReaderByTimestamp>	executeForByTimestampReader(long queryId, java.util.List<ChunkReaderWrap> chunkReaderWraps)	Receive a list of chunkReaderWraps and judge whether it should be processed using external sort.
java.util.List<org.apache.iotdb.tsfile.read.reader.IPointReader>	executeForIPointReader(long queryId, java.util.List<ChunkReaderWrap> chunkReaderWraps)	Receive a list of ChunkReaderWraps and judge whether it should be processed using external sort.
static SimpleExternalSortEngine	getInstance()

Methods inherited from class java.lang.Object

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

Method Detail

executeForIPointReader

public java.util.List<org.apache.iotdb.tsfile.read.reader.IPointReader> executeForIPointReader(long queryId,
                                                                                               java.util.List<ChunkReaderWrap> chunkReaderWraps)
                                                                                        throws java.io.IOException

Description copied from interface: ExternalSortJobEngine

Receive a list of ChunkReaderWraps and judge whether it should be processed using external sort. If needed, do the merge sort for all ChunkReaderWraps using specific strategy.

Specified by:

executeForIPointReader in interface ExternalSortJobEngine

Parameters:

queryId - query job id

chunkReaderWraps - A list of ChunkReaderWrap

Throws:

java.io.IOException

executeForByTimestampReader

public java.util.List<IReaderByTimestamp> executeForByTimestampReader(long queryId,
                                                                      java.util.List<ChunkReaderWrap> chunkReaderWraps)
                                                               throws java.io.IOException

Description copied from interface: ExternalSortJobEngine

Receive a list of chunkReaderWraps and judge whether it should be processed using external sort. If needed, do the merge sort for all ChunkReaderWraps using specific strategy.

Specified by:

executeForByTimestampReader in interface ExternalSortJobEngine

chunkReaderWraps - A list of ChunkReaderWrap

Throws:

java.io.IOException

createJob

public org.apache.iotdb.db.query.externalsort.ExternalSortJob createJob(long queryId,
                                                                        java.util.List<ChunkReaderWrap> readerWrapList)

Description copied from interface: ExternalSortJobEngine

Create an external sort job which merges many chunks.

Specified by:

createJob in interface ExternalSortJobEngine

getInstance

public static SimpleExternalSortEngine getInstance()