org.apache.cassandra.db.compaction
Class CompactionIterator

java.lang.Object
  com.google.common.collect.UnmodifiableIterator<T>
      com.google.common.collect.AbstractIterator<T2>
          org.apache.cassandra.utils.ReducingIterator<SSTableIdentityIterator,AbstractCompactedRow>
              org.apache.cassandra.db.compaction.CompactionIterator

All Implemented Interfaces:

java.io.Closeable, java.lang.Iterable<AbstractCompactedRow>, java.util.Iterator<AbstractCompactedRow>, CompactionInfo.Holder

public class CompactionIterator
extends ReducingIterator<SSTableIdentityIterator,AbstractCompactedRow>
implements java.io.Closeable, CompactionInfo.Holder

Field Summary

protected CompactionController	controller
static int	FILE_BUFFER_SIZE
protected java.util.List<SSTableIdentityIterator>	rows
protected CompactionType	type

Fields inherited from class org.apache.cassandra.utils.ReducingIterator

last, source

Constructor Summary

	CompactionIterator(CompactionType type, java.lang.Iterable<SSTableReader> sstables, CompactionController controller)
protected	CompactionIterator(CompactionType type, java.util.Iterator iter, CompactionController controller)

Method Summary

void	close()
protected static org.apache.commons.collections.iterators.CollatingIterator	getCollatingIterator(java.lang.Iterable<SSTableReader> sstables)
CompactionInfo	getCompactionInfo()
protected AbstractCompactedRow	getReduced() return the last object computed by reduce
protected java.lang.Iterable<SSTableScanner>	getScanners()
protected boolean	isEqual(SSTableIdentityIterator o1, SSTableIdentityIterator o2) override this if the keys you want to base the reduce on are not the same as the object itself (but can be generated from it)
void	reduce(SSTableIdentityIterator current) combine this object with the previous ones.
java.lang.String	toString()

Methods inherited from class org.apache.cassandra.utils.ReducingIterator

computeNext, iterator, onKeyChange

Methods inherited from class com.google.common.collect.AbstractIterator

endOfData, hasNext, next, peek

Methods inherited from class com.google.common.collect.UnmodifiableIterator

remove

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

hasNext, next, remove

Field Detail

FILE_BUFFER_SIZE

public static final int FILE_BUFFER_SIZE

See Also:

Constant Field Values

rows

protected final java.util.List<SSTableIdentityIterator> rows

type

protected final CompactionType type

controller

protected final CompactionController controller

Constructor Detail

CompactionIterator

public CompactionIterator(CompactionType type,
                          java.lang.Iterable<SSTableReader> sstables,
                          CompactionController controller)
                   throws java.io.IOException

Throws:

java.io.IOException

CompactionIterator

protected CompactionIterator(CompactionType type,
                             java.util.Iterator iter,
                             CompactionController controller)

Method Detail

getCollatingIterator

protected static org.apache.commons.collections.iterators.CollatingIterator getCollatingIterator(java.lang.Iterable<SSTableReader> sstables)
                                                                                          throws java.io.IOException

Throws:

java.io.IOException

getCompactionInfo

public CompactionInfo getCompactionInfo()

Specified by:

getCompactionInfo in interface CompactionInfo.Holder

isEqual

protected boolean isEqual(SSTableIdentityIterator o1,
                          SSTableIdentityIterator o2)

Description copied from class: ReducingIterator

override this if the keys you want to base the reduce on are not the same as the object itself (but can be generated from it)

Overrides:

isEqual in class ReducingIterator<SSTableIdentityIterator,AbstractCompactedRow>

reduce

public void reduce(SSTableIdentityIterator current)

Description copied from class: ReducingIterator

combine this object with the previous ones. intermediate state is up to your implementation.

Specified by:

reduce in class ReducingIterator<SSTableIdentityIterator,AbstractCompactedRow>

getReduced

protected AbstractCompactedRow getReduced()

Description copied from class: ReducingIterator

return the last object computed by reduce

Specified by:

getReduced in class ReducingIterator<SSTableIdentityIterator,AbstractCompactedRow>

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException

getScanners

protected java.lang.Iterable<SSTableScanner> getScanners()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object