org.modeshape.jcr.query.engine.process

Class PartialMemoryCountableSequence

java.lang.Object

org.modeshape.jcr.query.NodeSequence

org.modeshape.jcr.query.engine.process.CountableSequence

org.modeshape.jcr.query.engine.process.PartialMemoryCountableSequence

public class PartialMemoryCountableSequence
extends CountableSequence

A sequence that will return an accurate size for a given NodeSequence by buffering and counting the nodes and then accessing the buffered sequence. Some number of batches will be stored in-memory, while the rest are stored off-heap.

See Also:

CountableSequence

Nested Class Summary

Nested classes/interfaces inherited from class org.modeshape.jcr.query.NodeSequence

NodeSequence.AlternateSizeBatch, NodeSequence.Batch, NodeSequence.LimitBatch, NodeSequence.MultiWidthBatch, NodeSequence.Restartable, NodeSequence.RowAccessor, NodeSequence.RowFilter, NodeSequence.SingleWidthBatch

Field Summary

Fields inherited from class org.modeshape.jcr.query.engine.process.CountableSequence

remainingRowCount, width, workspaceName

Fields inherited from class org.modeshape.jcr.query.NodeSequence

LOGGER, NO_PASS_ROW_FILTER, PASS_ROW_FILTER

Constructor Summary

Constructors

Constructor and Description
PartialMemoryCountableSequence(String workspaceName, NodeSequence original, BufferManager bufferMgr, CachedNodeSupplier nodeCache, int numRowsInMemory)

Method Summary

Modifier and Type	Method and Description
protected NodeSequence.Batch	doNextBatch()
protected long	loadAll(NodeSequence sequence, BufferManager.QueueBuffer<BufferedRows.BufferedRow> buffer, AtomicLong batchSize) Load all of the rows from the supplied sequence into the buffer.

Methods inherited from class org.modeshape.jcr.query.engine.process.CountableSequence

batchFrom, close, createRow, doInitialize, getRowCount, initialize, isEmpty, loadAll, nextBatch, width

Methods inherited from class org.modeshape.jcr.query.NodeSequence

append, batchFilteredWith, batchOf, batchOf, batchOf, batchOfKeys, batchOfKeys, batchOfKeys, batchOfKeys, batchWithCount, copy, emptyBatch, emptySequence, filter, keyFor, limit, limit, merging, requireBoth, requireEither, skip, slice, slicingBatch, withBatch, withBatches, withBatches, withNode, withNodeKeys, withNodeKeys, withNodeKeys, withNodeKeys, withNodes, withNodes

Methods inherited from class java.lang.Object

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

Constructor Detail

PartialMemoryCountableSequence

public PartialMemoryCountableSequence(String workspaceName,
                                      NodeSequence original,
                                      BufferManager bufferMgr,
                                      CachedNodeSupplier nodeCache,
                                      int numRowsInMemory)

Method Detail

doNextBatch

protected NodeSequence.Batch doNextBatch()

Overrides:

doNextBatch in class CountableSequence

loadAll

protected long loadAll(NodeSequence sequence,
                       BufferManager.QueueBuffer<BufferedRows.BufferedRow> buffer,
                       AtomicLong batchSize)

Description copied from class: CountableSequence

Load all of the rows from the supplied sequence into the buffer.

Overrides:

loadAll in class CountableSequence

Parameters:

sequence - the node sequence; may not be null

buffer - the buffer into which all rows should be loaded; may not be null

batchSize - the atomic that should be set with the size of the first batch

Returns:

the total number of rows