org.apache.cassandra.db

Interface SinglePartitionReadQuery

All Superinterfaces:

ReadQuery

All Known Implementing Classes:

SinglePartitionReadCommand, VirtualTableSinglePartitionReadQuery

public interface SinglePartitionReadQuery
extends ReadQuery

A ReadQuery for a single partition.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	SinglePartitionReadQuery.Group<T extends SinglePartitionReadQuery> Groups multiple single partition read queries.

Method Summary

Modifier and Type	Method and Description
ClusteringIndexFilter	clusteringIndexFilter()
static SinglePartitionReadQuery	create(TableMetadata metadata, int nowInSec, ColumnFilter columnFilter, RowFilter rowFilter, DataLimits limits, DecoratedKey partitionKey, ClusteringIndexFilter clusteringIndexFilter) Creates a new read query on a single partition.
static SinglePartitionReadQuery	create(TableMetadata metadata, int nowInSec, DecoratedKey key, ColumnFilter columnFilter, ClusteringIndexFilter filter) Creates a new read query on a single partition.
static SinglePartitionReadQuery.Group<? extends SinglePartitionReadQuery>	createGroup(TableMetadata metadata, int nowInSec, ColumnFilter columnFilter, RowFilter rowFilter, DataLimits limits, java.util.List<DecoratedKey> partitionKeys, ClusteringIndexFilter clusteringIndexFilter)
SinglePartitionReadQuery	forPaging(Clustering<?> lastReturned, DataLimits limits) Returns a new SinglePartitionReadQuery suitable to paging from the last returned row.
default SinglePartitionPager	getPager(PagingState pagingState, ProtocolVersion protocolVersion) Returns a pager for the query.
DecoratedKey	partitionKey() Returns the key of the partition queried by this ReadQuery
default boolean	selectsClustering(DecoratedKey key, Clustering<?> clustering)
default boolean	selectsKey(DecoratedKey key)
SinglePartitionReadQuery	withUpdatedLimit(DataLimits newLimits) Creates a new SinglePartitionReadQuery with the specified limits.

Methods inherited from interface org.apache.cassandra.db.ReadQuery

columnFilter, empty, execute, executeInternal, executeLocally, executionController, isEmpty, limits, maybeValidateIndex, metadata, nowInSec, rowFilter, selectsFullPartition

Method Detail

createGroup

static SinglePartitionReadQuery.Group<? extends SinglePartitionReadQuery> createGroup(TableMetadata metadata,
                                                                                      int nowInSec,
                                                                                      ColumnFilter columnFilter,
                                                                                      RowFilter rowFilter,
                                                                                      DataLimits limits,
                                                                                      java.util.List<DecoratedKey> partitionKeys,
                                                                                      ClusteringIndexFilter clusteringIndexFilter)

create

static SinglePartitionReadQuery create(TableMetadata metadata,
                                       int nowInSec,
                                       DecoratedKey key,
                                       ColumnFilter columnFilter,
                                       ClusteringIndexFilter filter)

Creates a new read query on a single partition.

Parameters:

metadata - the table to query.

nowInSec - the time in seconds to use are "now" for this query.

key - the partition key for the partition to query.

columnFilter - the column filter to use for the query.

filter - the clustering index filter to use for the query.

Returns:

a newly created read query. The returned query will use no row filter and have no limits.

create

static SinglePartitionReadQuery create(TableMetadata metadata,
                                       int nowInSec,
                                       ColumnFilter columnFilter,
                                       RowFilter rowFilter,
                                       DataLimits limits,
                                       DecoratedKey partitionKey,
                                       ClusteringIndexFilter clusteringIndexFilter)

Creates a new read query on a single partition.

Parameters:

metadata - the table to query.

nowInSec - the time in seconds to use are "now" for this query.

columnFilter - the column filter to use for the query.

rowFilter - the row filter to use for the query.

limits - the limits to use for the query.

partitionKey - the partition key for the partition to query.

clusteringIndexFilter - the clustering index filter to use for the query.

Returns:

a newly created read query.

partitionKey

DecoratedKey partitionKey()

Returns the key of the partition queried by this ReadQuery

Returns:

the key of the partition queried

withUpdatedLimit

SinglePartitionReadQuery withUpdatedLimit(DataLimits newLimits)

Creates a new SinglePartitionReadQuery with the specified limits.

Parameters:

newLimits - the new limits

Returns:

the new SinglePartitionReadQuery

forPaging

SinglePartitionReadQuery forPaging(Clustering<?> lastReturned,
                                   DataLimits limits)

Returns a new SinglePartitionReadQuery suitable to paging from the last returned row.

Parameters:

lastReturned - the last row returned by the previous page. The newly created query will only query row that comes after this (in query order). This can be null if this is the first page.

limits - the limits to use for the page to query.

Returns:

the newly create query.

getPager

default SinglePartitionPager getPager(PagingState pagingState,
                                      ProtocolVersion protocolVersion)

Description copied from interface: ReadQuery

Returns a pager for the query.

Specified by:

getPager in interface ReadQuery

Parameters:

pagingState - the PagingState to start from if this is a paging continuation. This can be null if this is the start of paging.

protocolVersion - the protocol version to use for the paging state of that pager.

Returns:

a pager for the query.

clusteringIndexFilter

ClusteringIndexFilter clusteringIndexFilter()

selectsKey

default boolean selectsKey(DecoratedKey key)

Specified by:

selectsKey in interface ReadQuery

Returns:

true if the read query would select the given key, including checks against the row filter, if checkRowFilter is true

selectsClustering

default boolean selectsClustering(DecoratedKey key,
                                  Clustering<?> clustering)

Specified by:

selectsClustering in interface ReadQuery

Returns:

true if the read query would select the given clustering, including checks against the row filter, if checkRowFilter is true