org.apache.ignite.internal.processors.query.h2.twostep

Class AbstractReducer

java.lang.Object

org.apache.ignite.internal.processors.query.h2.twostep.AbstractReducer

Direct Known Subclasses:

SortedReducer, UnsortedBaseReducer

public abstract class AbstractReducer
extends Object

Base class for reducer of remote index lookup results.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Reducer.RowComparator Rows comparator.

Field Summary

Fields

Modifier and Type	Field and Description
protected ReduceBlockList<org.gridgain.internal.h2.result.Row>	fetched Will be r/w from query execution thread only, does not need to be threadsafe.
protected org.apache.ignite.internal.processors.query.h2.H2MemoryTracker	memTracker
protected Set<UUID>	srcNodes Row source nodes.

Method Summary

Modifier and Type	Method and Description
void	addPage(ReduceResultPage page) Offer result page for reduce.
protected abstract void	addPage0(ReduceResultPage page)
protected void	checkBounds(org.gridgain.internal.h2.result.Row lastEvictedRow, org.gridgain.internal.h2.result.SearchRow first, org.gridgain.internal.h2.result.SearchRow last)
protected ReduceResultPage	createDummyLastPage(ReduceResultPage lastPage)
void	fail(javax.cache.CacheException e)
boolean	fetchedAll() Check if all rows has been fetched from all sources.
org.gridgain.internal.h2.index.Cursor	find(@Nullable org.gridgain.internal.h2.result.SearchRow first, @Nullable org.gridgain.internal.h2.result.SearchRow last) Find a rows and create a cursor to iterate over the result.
protected abstract org.gridgain.internal.h2.index.Cursor	findAllFetched(List<org.gridgain.internal.h2.result.Row> fetched, @Nullable org.gridgain.internal.h2.result.SearchRow first, @Nullable org.gridgain.internal.h2.result.SearchRow last)
protected abstract org.gridgain.internal.h2.index.Cursor	findInStream(@Nullable org.gridgain.internal.h2.result.SearchRow first, @Nullable org.gridgain.internal.h2.result.SearchRow last)
boolean	hasSource(UUID nodeId) Check if node with given nodeId is data source node for the index.
org.apache.ignite.internal.processors.query.h2.H2MemoryTracker	memoryTracker()
void	memoryTracker(org.apache.ignite.internal.processors.query.h2.H2MemoryTracker memTracker) Set memory tracker for reducer.
protected void	onBlockEvict(@NotNull List<org.gridgain.internal.h2.result.Row> evictedBlock)
void	onFailure(UUID nodeId, javax.cache.CacheException e) Fail cursor callback.
protected Iterator<org.gridgain.internal.h2.value.Value[]>	pollNextIterator(org.apache.ignite.internal.processors.query.h2.twostep.AbstractReducer.Pollable<ReduceResultPage> queue, Iterator<org.gridgain.internal.h2.value.Value[]> iter)
void	setPageSize(int pageSize)
void	setSources(Map<ClusterNode,BitSet> nodesToSegmentsCnt) Set source nodes.
Set<UUID>	sources()

Methods inherited from class java.lang.Object

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

Field Detail

srcNodes

protected Set<UUID> srcNodes

Row source nodes.

fetched

protected final ReduceBlockList<org.gridgain.internal.h2.result.Row> fetched

Will be r/w from query execution thread only, does not need to be threadsafe.

memTracker

protected org.apache.ignite.internal.processors.query.h2.H2MemoryTracker memTracker

Method Detail

setSources

public void setSources(Map<ClusterNode,BitSet> nodesToSegmentsCnt)

Set source nodes.

Parameters:

nodesToSegmentsCnt - Mapping of nodes to expected count of segments to scan.

sources

public Set<UUID> sources()

Returns:

Return source nodes for this merge index.

hasSource

public boolean hasSource(UUID nodeId)

Check if node with given nodeId is data source node for the index.

Parameters:

nodeId - Node ID.

Returns:

true If this index needs data from the given source node, false otherwise.

setPageSize

public void setPageSize(int pageSize)

Parameters:

pageSize - Page size.

onFailure

public void onFailure(UUID nodeId,
                      javax.cache.CacheException e)

Fail cursor callback.

Parameters:

nodeId - Node ID.

e - Exception.

find

public final org.gridgain.internal.h2.index.Cursor find(@Nullable
                                                        @Nullable org.gridgain.internal.h2.result.SearchRow first,
                                                        @Nullable
                                                        @Nullable org.gridgain.internal.h2.result.SearchRow last)

Find a rows and create a cursor to iterate over the result.

Parameters:

first - Lower bound.

last - Upper bound.

Returns:

Cursor instance.

findInStream

protected abstract org.gridgain.internal.h2.index.Cursor findInStream(@Nullable
                                                                      @Nullable org.gridgain.internal.h2.result.SearchRow first,
                                                                      @Nullable
                                                                      @Nullable org.gridgain.internal.h2.result.SearchRow last)

Parameters:

first - Row.

last - Row.

Returns:

Cursor over remote streams.

findAllFetched

protected abstract org.gridgain.internal.h2.index.Cursor findAllFetched(List<org.gridgain.internal.h2.result.Row> fetched,
                                                                        @Nullable
                                                                        @Nullable org.gridgain.internal.h2.result.SearchRow first,
                                                                        @Nullable
                                                                        @Nullable org.gridgain.internal.h2.result.SearchRow last)

Parameters:

fetched - Fetched data.

first - Row.

last - Row.

Returns:

Cursor over fetched data.

checkBounds

protected void checkBounds(org.gridgain.internal.h2.result.Row lastEvictedRow,
                           org.gridgain.internal.h2.result.SearchRow first,
                           org.gridgain.internal.h2.result.SearchRow last)

Parameters:

lastEvictedRow - Last evicted fetched row.

first - Lower bound.

last - Upper bound.

onBlockEvict

protected void onBlockEvict(@NotNull
                            @NotNull List<org.gridgain.internal.h2.result.Row> evictedBlock)

Parameters:

evictedBlock - Evicted block.

addPage

public void addPage(ReduceResultPage page)

Offer result page for reduce.

Parameters:

page - Page.

addPage0

protected abstract void addPage0(ReduceResultPage page)

Parameters:

page - Page.

fail

public void fail(javax.cache.CacheException e)

Parameters:

e - Error.

createDummyLastPage

protected final ReduceResultPage createDummyLastPage(ReduceResultPage lastPage)

Parameters:

lastPage - Real last page.

Returns:

Created dummy page.

memoryTracker

public void memoryTracker(org.apache.ignite.internal.processors.query.h2.H2MemoryTracker memTracker)

Set memory tracker for reducer.

memoryTracker

public org.apache.ignite.internal.processors.query.h2.H2MemoryTracker memoryTracker()

Returns:

Memory tracker.

pollNextIterator

protected final Iterator<org.gridgain.internal.h2.value.Value[]> pollNextIterator(org.apache.ignite.internal.processors.query.h2.twostep.AbstractReducer.Pollable<ReduceResultPage> queue,
                                                                                  Iterator<org.gridgain.internal.h2.value.Value[]> iter)

Parameters:

queue - Queue to poll.

iter - Current iterator.

Returns:

The same or new iterator.

fetchedAll

public boolean fetchedAll()

Check if all rows has been fetched from all sources.

Returns:

true If all rows has been fetched, false otherwise.