Package io.deephaven.generic.page

Class ChunkHolderPageChar<ATTR extends Any>

java.lang.Object

io.deephaven.generic.page.ChunkHolderPageChar<ATTR>

All Implemented Interfaces:

Page<ATTR>, Page.WithDefaults<ATTR>, PagingChunkSource<ATTR>, ChunkSource<ATTR>, FillContextMaker, GetContextMaker, DefaultChunkSource<ATTR>, DefaultChunkSource.SupportsContiguousGet<ATTR>

public class ChunkHolderPageChar<ATTR extends Any>
extends Object
implements Page.WithDefaults<ATTR>, DefaultChunkSource.SupportsContiguousGet<ATTR>

Append-only Page implementation that permanently wraps an array for data storage, atomically replacing "view" chunks with larger ones as the page is extended.

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.engine.table.ChunkSource

ChunkSource.FillContext, ChunkSource.GetContext

Nested classes/interfaces inherited from interface io.deephaven.engine.table.impl.DefaultChunkSource

DefaultChunkSource.SupportsContiguousGet<ATTR extends Any>, DefaultChunkSource.WithPrev<ATTR extends Any>

Nested classes/interfaces inherited from interface io.deephaven.engine.page.Page

Page.WithDefaults<ATTR extends Any>, Page.WithDefaultsForRepeatingValues<ATTR extends Any>

Field Summary

Fields inherited from interface io.deephaven.engine.table.ChunkSource

DEFAULT_FILL_INSTANCE, ZERO_LENGTH_CHUNK_SOURCE_ARRAY

Constructor Summary

Constructors

Constructor	Description
ChunkHolderPageChar(long mask, long firstRow, @org.jetbrains.annotations.NotNull char[] storage)

Method Summary

Modifier and Type	Method	Description
final void	acceptAppend(@NotNull CharChunk<ATTR> slice, int expectedCurrentSize)	Accept an appended slice of data to the currently-visible range for this page.
final void	fillChunkAppend(@NotNull ChunkSource.FillContext context, @NotNull WritableChunk<? super ATTR> destination, @NotNull RowSequence rowSequence)	Appends the values referenced by orderKeys onto destination.
final long	firstRowOffset()
final char	get(long rowKey)
final Chunk<? extends ATTR>	getChunk(@NotNull ChunkSource.GetContext context, long firstKey, long lastKey)	Same as ChunkSource.getChunk(GetContext, RowSequence), except that you pass in the begin and last keys representing the begin and last (inclusive) keys of a single range rather than an RowSequence.
final ChunkType	getChunkType()	Get the most suitable ChunkType for use with this ChunkSource.
final WritableCharChunk<ATTR>	getSliceForAppend(int expectedCurrentSize)	Get a writable chunk slice of this page's data storage, starting at the end of the currently-visible range, to be used for appending new data.
final long	mask()	This mask is applied to RowSequences which are passed into DefaultChunkSource.getChunk(io.deephaven.engine.table.ChunkSource.GetContext, io.deephaven.engine.rowset.RowSequence), ChunkSource.fillChunk(io.deephaven.engine.table.ChunkSource.FillContext, io.deephaven.chunk.WritableChunk<? super ATTR>, io.deephaven.engine.rowset.RowSequence), and PagingChunkSource.fillChunkAppend(FillContext, WritableChunk, RowSequence.Iterator) .
final long	maxRow(long rowKey)	The maxRow is the greatest possible row key which may be referenced in this ChunkSource.
final int	size()

Methods inherited from class java.lang.Object

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

Methods inherited from interface io.deephaven.engine.table.impl.DefaultChunkSource

getChunkByFilling, makeGetContext

Methods inherited from interface io.deephaven.engine.table.impl.DefaultChunkSource.SupportsContiguousGet

getChunk

Methods inherited from interface io.deephaven.engine.table.FillContextMaker

makeFillContext

Methods inherited from interface io.deephaven.engine.table.GetContextMaker

makeGetContext

Methods inherited from interface io.deephaven.engine.page.Page

advanceToNextPage, advanceToNextPage, advanceToNextPageAndGetPositionDistance, firstRow, getRowOffset

Methods inherited from interface io.deephaven.engine.page.Page.WithDefaults

fillChunk, fillChunkAppend

Methods inherited from interface io.deephaven.engine.page.PagingChunkSource

makeFillContext

Constructor Details

ChunkHolderPageChar

public ChunkHolderPageChar(long mask,
 long firstRow,
 @NotNull
 @org.jetbrains.annotations.NotNull char[] storage)

Method Details

getChunkType

public final ChunkType getChunkType()

Description copied from interface: ChunkSource

Get the most suitable ChunkType for use with this ChunkSource.

Specified by:

getChunkType in interface ChunkSource<ATTR extends Any>

Returns:

The ChunkType

firstRowOffset

public final long firstRowOffset()

Specified by:

firstRowOffset in interface Page<ATTR extends Any>

Returns:

the first row of this page, after applying the PagingChunkSource.mask(), which refers to the first row of this page.

maxRow

public final long maxRow(long rowKey)

Description copied from interface: PagingChunkSource

The maxRow is the greatest possible row key which may be referenced in this ChunkSource. This method is used by PagingChunkSource.fillChunkAppend(FillContext, WritableChunk, RowSequence.Iterator) to determine which of its row keys are supplied by this PagingChunkSource.

The default implementation assumes that only one PagingChunkSource exits for each page reference. That is, there is only one PagingChunkSource for RowSequences with the same bits outside of PagingChunkSource.mask().

It is also possible to pack multiple, non-overlapping PagingChunkSources into the same page reference. In this case, one typically will want to override maxRow. An example such implementation is ChunkPage.

Specified by:

maxRow in interface PagingChunkSource<ATTR extends Any>

Parameters:

rowKey - Any row key contained by this PagingChunkSource

Returns:

The maximum last row key of the page, located in the same way as rowKey

mask

public final long mask()

Description copied from interface: PagingChunkSource

This mask is applied to RowSequences which are passed into DefaultChunkSource.getChunk(io.deephaven.engine.table.ChunkSource.GetContext, io.deephaven.engine.rowset.RowSequence), ChunkSource.fillChunk(io.deephaven.engine.table.ChunkSource.FillContext, io.deephaven.chunk.WritableChunk<? super ATTR>, io.deephaven.engine.rowset.RowSequence), and PagingChunkSource.fillChunkAppend(FillContext, WritableChunk, RowSequence.Iterator) . This allows PagingChunkSources to be cached and reused even if they are properly relocated in key space.

Specified by:

mask in interface PagingChunkSource<ATTR extends Any>

Returns:

The mask for this PagingChunkSource, which must be a bitmask representing some number of lower order bits of a long.

size

public final int size()

Returns:

The current size of this page

get

public final char get(long rowKey)

Parameters:

rowKey - The row key to retrieve the value for

Returns:

The value at rowKey

getChunk

public final Chunk<? extends ATTR> getChunk(@NotNull
 @NotNull ChunkSource.GetContext context,
 long firstKey,
 long lastKey)

Description copied from interface: ChunkSource

Same as ChunkSource.getChunk(GetContext, RowSequence), except that you pass in the begin and last keys representing the begin and last (inclusive) keys of a single range rather than an RowSequence. Typically you want to call this only if you don't have an RowSequence, such as during an RowSequence.forAllRowKeyRanges(LongRangeConsumer) call. In this case, it allows you to avoid creating an intermediary RowSequence object.

Specified by:

getChunk in interface ChunkSource<ATTR extends Any>

Specified by:

getChunk in interface DefaultChunkSource<ATTR extends Any>

Specified by:

getChunk in interface DefaultChunkSource.SupportsContiguousGet<ATTR extends Any>

Parameters:

context - A context containing all mutable/state related data used in retrieving the Chunk. In particular, the Context may be used to provide a Chunk data pool

firstKey - The beginning key (inclusive) of the range to fetch in the chunk

lastKey - The last key (inclusive) of the range to fetch in the chunk

fillChunkAppend

public final void fillChunkAppend(@NotNull
 @NotNull ChunkSource.FillContext context,
 @NotNull
 @NotNull WritableChunk<? super ATTR> destination,
 @NotNull
 @NotNull RowSequence rowSequence)

Description copied from interface: Page.WithDefaults

Appends the values referenced by orderKeys onto destination. orderKeys are assumed to be entirely contained on this Page.

Specified by:

fillChunkAppend in interface Page.WithDefaults<ATTR extends Any>

getSliceForAppend

public final WritableCharChunk<ATTR> getSliceForAppend(int expectedCurrentSize)

Get a writable chunk slice of this page's data storage, starting at the end of the currently-visible range, to be used for appending new data.

Parameters:

expectedCurrentSize - The expected current size of the visible data in this page, used to assert correctness

Returns:

A chunk to fill with new data

acceptAppend

public final void acceptAppend(@NotNull
 @NotNull CharChunk<ATTR> slice,
 int expectedCurrentSize)

Accept an appended slice of data to the currently-visible range for this page. Ownership of slice transfers to the callee.

Parameters:

slice - The slice chunk of data, which must have been returned by getSliceForAppend(int); ownership transfers to the callee

expectedCurrentSize - The expected current size of the visible data in this page, used to assert correctness