org.apache.cassandra.service.pager

Class QueryPagers

java.lang.Object

org.apache.cassandra.service.pager.QueryPagers

public class QueryPagers
extends java.lang.Object

Static utility methods to create query pagers.

Method Summary

Methods

Modifier and Type	Method and Description
static int	countPaged(java.lang.String keyspace, java.lang.String columnFamily, java.nio.ByteBuffer key, SliceQueryFilter filter, ConsistencyLevel consistencyLevel, ClientState cState, int pageSize, long now) Convenience method that count (live) cells/rows for a given slice of a row, but page underneath.
static QueryPager	localPager(Pageable command)
static boolean	mayNeedPaging(Pageable command, int pageSize)
static QueryPager	pager(Pageable command, ConsistencyLevel consistencyLevel, ClientState cState)
static QueryPager	pager(Pageable command, ConsistencyLevel consistencyLevel, ClientState cState, PagingState state)
static java.util.Iterator<ColumnFamily>	pageRowLocally(ColumnFamilyStore cfs, java.nio.ByteBuffer key, int pageSize) Convenience method to (locally) page an internal row.

Methods inherited from class java.lang.Object

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

Method Detail

mayNeedPaging

public static boolean mayNeedPaging(Pageable command,
                    int pageSize)

pager

public static QueryPager pager(Pageable command,
               ConsistencyLevel consistencyLevel,
               ClientState cState)

pager

public static QueryPager pager(Pageable command,
               ConsistencyLevel consistencyLevel,
               ClientState cState,
               PagingState state)

localPager

public static QueryPager localPager(Pageable command)

pageRowLocally

public static java.util.Iterator<ColumnFamily> pageRowLocally(ColumnFamilyStore cfs,
                                              java.nio.ByteBuffer key,
                                              int pageSize)

Convenience method to (locally) page an internal row. Used to 2ndary index a wide row without dying.

countPaged

public static int countPaged(java.lang.String keyspace,
             java.lang.String columnFamily,
             java.nio.ByteBuffer key,
             SliceQueryFilter filter,
             ConsistencyLevel consistencyLevel,
             ClientState cState,
             int pageSize,
             long now)
                      throws RequestValidationException,
                             RequestExecutionException

Convenience method that count (live) cells/rows for a given slice of a row, but page underneath.

Throws:

RequestValidationException

RequestExecutionException