Package org.yamcs.yarch

Class AbstractTableWalker

java.lang.Object

org.yamcs.yarch.AbstractTableWalker

All Implemented Interfaces:

TableWalker

Direct Known Subclasses:

RdbTableWalker

public abstract class AbstractTableWalker
extends Object
implements TableWalker

Iterator through a table.

Iterates through partitions, can support partition filter (by time and/or value) and and also ranges on primary key.

This class expects raw (byte[]) input for the primary key ranges.

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	ascending
protected boolean	follow
protected Log	log
protected long	numRecordsRead
protected boolean	running
protected TableDefinition	tableDefinition

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractTableWalker(YarchDatabaseInstance ydb, TableDefinition tableDefinition, boolean ascending, boolean follow)

Method Summary

Modifier and Type	Method	Description
void	close()
protected boolean	iAscendingFinished(byte[] key, byte[] value, byte[] rangeEnd)
protected boolean	isDescendingFinished(byte[] key, byte[] value, byte[] rangeStart)
protected boolean	isRunning()
void	setPartitionFilter(TimeInterval partitionTimeFilter, Set<Object> partitionValueFilter)
void	setPrimaryIndexRange(DbRange range)
void	walk(TableVisitor visitor)
protected abstract boolean	walkInterval(PartitionManager.Interval interval, DbRange range, TableVisitor visitor)	Runs the data in a time interval (corresponding to a time partition) sending data only that conform with the start and end filters.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.yamcs.yarch.TableWalker

setSecondaryIndexRange

Field Detail

log

protected Log log

tableDefinition

protected TableDefinition tableDefinition

ascending

protected final boolean ascending

follow

protected final boolean follow

numRecordsRead

protected long numRecordsRead

running

protected volatile boolean running

Constructor Detail

AbstractTableWalker

protected AbstractTableWalker(YarchDatabaseInstance ydb,
                              TableDefinition tableDefinition,
                              boolean ascending,
                              boolean follow)

Method Detail

walk

public void walk(TableVisitor visitor)

Specified by:

walk in interface TableWalker

iAscendingFinished

protected boolean iAscendingFinished(byte[] key,
                                     byte[] value,
                                     byte[] rangeEnd)

isDescendingFinished

protected boolean isDescendingFinished(byte[] key,
                                       byte[] value,
                                       byte[] rangeStart)

setPartitionFilter

public void setPartitionFilter(TimeInterval partitionTimeFilter,
                               Set<Object> partitionValueFilter)

Specified by:

setPartitionFilter in interface TableWalker

setPrimaryIndexRange

public void setPrimaryIndexRange(DbRange range)

Specified by:

setPrimaryIndexRange in interface TableWalker

walkInterval

protected abstract boolean walkInterval(PartitionManager.Interval interval,
                                        DbRange range,
                                        TableVisitor visitor)
                                 throws YarchException

Runs the data in a time interval (corresponding to a time partition) sending data only that conform with the start and end filters. Returns true if the stop condition is met

Returns:

returns true if the end condition has been reached.

Throws:

YarchException

isRunning

protected boolean isRunning()

close

public void close()

Specified by:

close in interface TableWalker