Package org.apache.cassandra.db

Class ClusteringPrefix.Deserializer

java.lang.Object

org.apache.cassandra.db.ClusteringPrefix.Deserializer

Enclosing interface:

ClusteringPrefix<V>

public static class ClusteringPrefix.Deserializer
extends Object

Helper class that makes the deserialization of clustering prefixes faster.

The main reason for this is that when we deserialize rows from sstables, there is many cases where we have a bunch of rows to skip at the beginning of an index block because those rows are before the requested slice. This class make sure we can answer the question "is the next row on disk before the requested slice" with as little work as possible. It does that by providing a comparison method that deserialize only what is needed to decide of the comparison.

Constructor Summary

Constructors

Constructor	Description
Deserializer(ClusteringComparator comparator, DataInputPlus in, SerializationHeader header)

Method Summary

Modifier and Type	Method	Description
<T> int	compareNextTo(ClusteringBoundOrBoundary<T> bound)
ClusteringBoundOrBoundary<byte[]>	deserializeNextBound()
Clustering<byte[]>	deserializeNextClustering()
void	prepare(int flags, int extendedFlags)
ClusteringPrefix.Kind	skipNext()

Methods inherited from class java.lang.Object

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

Constructor Details

Deserializer

public Deserializer(ClusteringComparator comparator,
 DataInputPlus in,
 SerializationHeader header)

Method Details

prepare

public void prepare(int flags,
 int extendedFlags)
             throws IOException

Throws:

IOException

compareNextTo

public <T> int compareNextTo(ClusteringBoundOrBoundary<T> bound)
                      throws IOException

Throws:

IOException

deserializeNextBound

public ClusteringBoundOrBoundary<byte[]> deserializeNextBound()
                                                       throws IOException

Throws:

IOException

deserializeNextClustering

public Clustering<byte[]> deserializeNextClustering()
                                             throws IOException

Throws:

IOException

skipNext

public ClusteringPrefix.Kind skipNext()
                               throws IOException

Throws:

IOException