org.apache.cassandra.db.compaction

Class AbstractCompactedRow

java.lang.Object

org.apache.cassandra.db.compaction.AbstractCompactedRow

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

LazilyCompactedRow, PrecompactedRow

public abstract class AbstractCompactedRow
extends java.lang.Object
implements java.io.Closeable

a CompactedRow is an object that takes a bunch of rows (keys + columnfamilies) and can write a compacted version of those rows to an output stream. It does NOT necessarily require creating a merged CF object in memory.

Field Summary

Fields

Modifier and Type	Field and Description
DecoratedKey	key

Constructor Summary

Constructors

Constructor and Description
AbstractCompactedRow(DecoratedKey key)

Method Summary

Methods

Modifier and Type	Method and Description
abstract ColumnStats	columnStats()
abstract void	update(java.security.MessageDigest digest) update @param digest with the data bytes of the row (not including row key or row size).
abstract RowIndexEntry	write(long currentPosition, java.io.DataOutput out) write the row (size + column index + filter + column data, but NOT row key) to @param out.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.io.Closeable

close

Field Detail

key

public final DecoratedKey key

Constructor Detail

AbstractCompactedRow

public AbstractCompactedRow(DecoratedKey key)

Method Detail

write

public abstract RowIndexEntry write(long currentPosition,
                  java.io.DataOutput out)
                             throws java.io.IOException

write the row (size + column index + filter + column data, but NOT row key) to @param out. write() may change internal state; it is NOT valid to call write() or update() a second time.

Returns:

index information for the written row, or null if the compaction resulted in only expired tombstones.

Throws:

java.io.IOException

update

public abstract void update(java.security.MessageDigest digest)

update @param digest with the data bytes of the row (not including row key or row size). May be called even if empty. update() may change internal state; it is NOT valid to call write() or update() a second time.

columnStats

public abstract ColumnStats columnStats()

Returns:

aggregate information about the columns in this row. Some fields may contain default values if computing them value would require extra effort we're not willing to make.