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/*
* Copyright (c) 2000, 2023, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* https://oss.oracle.com/licenses/upl.
*/
package com.tangosol.internal.util;
import com.tangosol.net.BackingMapContext;
import com.tangosol.net.partition.PartitionSet;
import com.tangosol.util.AbstractKeyBasedMap;
import com.tangosol.util.Base;
import com.tangosol.util.ChainedSet;
import com.tangosol.util.ClassHelper;
import com.tangosol.util.MapIndex;
import com.tangosol.util.SafeSortedMap;
import com.tangosol.util.SegmentedHashMap;
import com.tangosol.util.ValueExtractor;
import com.tangosol.util.comparator.SafeComparator;
import java.util.AbstractCollection;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeSet;
/**
* A composite view over partition indices for the specified partition set.
*
* @param the type of cache keys
* @param the type of cache values
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public class PartitionedIndexMap
extends AbstractKeyBasedMap, MapIndex>
{
// ---- constructors ----------------------------------------------------
/**
* Construct {@code PartitionedIndexMap} instance.
*
* @param ctx the {@link BackingMapContext context} associated with the indexed cache
* @param mapPartitioned the map of partition indices, keyed by partition number
* @param partitions the set of partitions to return an index map for, or {@code null}
* to return an index for all owned partitions
*/
public PartitionedIndexMap(BackingMapContext ctx,
Map, MapIndex>> mapPartitioned,
PartitionSet partitions)
{
f_ctx = ctx;
f_mapPartitioned = mapPartitioned;
f_partitions = partitions;
}
// ---- public API ------------------------------------------------------
/**
* Return a {@link MapIndex} for the specified extractor.
*
* @param extractor the value extractor to get the {@code MapIndex} for
*
* @return a {@link MapIndex} for the specified extractor
*/
public MapIndex get(ValueExtractor extractor)
{
int nPart = f_partitions == null
? f_mapPartitioned.keySet().stream().findFirst().orElse(-1)
: f_partitions.rnd();
MapIndex mapIndex = getMapIndex(nPart, extractor);
if (mapIndex != null)
{
return f_partitions != null && f_partitions.cardinality() == 1
? mapIndex // optimize for single partition
: new PartitionedIndex(extractor, mapIndex.isOrdered(), mapIndex.getComparator());
}
return null;
}
/**
* Return the set of partitions this index view is for.
*
* @return the set of partitions this index view is for
*/
public Iterable getPartitions()
{
return f_partitions == null ? f_mapPartitioned.keySet() : f_partitions;
}
// ---- helpers ---------------------------------------------------------
/**
* Return {@link MapIndex} for the specified partition and extractor.
*
* @param nPart the partition to get the index for
* @param extractor the extractor to get the index for
*
* @return a {@link MapIndex} for the specified partition and extractor, or
* {@code null} if this view does nopt contain specified partition
* or an index for the specified extractor
*/
protected MapIndex getMapIndex(int nPart, ValueExtractor extractor)
{
if (nPart >= 0 && (f_partitions == null ? f_mapPartitioned.containsKey(nPart) : f_partitions.contains(nPart)))
{
Map, MapIndex> mapPart = f_mapPartitioned.get(nPart);
if (mapPart != null)
{
return (MapIndex) mapPart.get(extractor);
}
}
return null;
}
// ---- AbstractKeyBasedMap interface -----------------------------------
@Override
public MapIndex get(Object oKey)
{
return get((ValueExtractor) oKey);
}
@Override
protected Iterator> iterateKeys()
{
return f_mapPartitioned.values().stream()
.flatMap(map -> map.keySet().stream())
.distinct()
.iterator();
}
@Override
public String toString()
{
return "PartitionedIndexMap{" +
"f_ctx=" + f_ctx +
", f_mapPartitioned=" + f_mapPartitioned +
", f_partitions=" + f_partitions +
'}';
}
// ---- inner class: PartitionedIndex -----------------------------------
/**
* Provides unified view over multiple partition-level MapIndex instances
* for a specific index.
*
* @param the type of indexed attribute
*/
public class PartitionedIndex
implements MapIndex
{
// ---- constructors ------------------------------------------------
/**
* Construct {@link PartitionedIndex} instance.
*
* @param extractor the {@code ValueExtractor} for this index
*
*/
PartitionedIndex(ValueExtractor extractor, boolean fOrdered, Comparator comparator)
{
f_extractor = extractor;
f_fOrdered = fOrdered;
f_comparator = fOrdered ? ensureSafeComparator(comparator) : null;
}
/**
* Ensures that the comparator used for index sorting supports {@code null} values.
*
* @param comparator the comparator to wrap, if necessary; can be {@code null}, in
* which case a trivial {@code SafeComparator} that uses natural
* ordering will be returned
*
* @return a {@link SafeComparator} instance
*
* @param the type of objects that may be compared by this comparator
*/
private Comparator ensureSafeComparator(Comparator comparator)
{
return comparator == null
? SafeComparator.INSTANCE()
: comparator instanceof SafeComparator
? comparator
: new SafeComparator<>(comparator);
}
// ---- MapIndex interface ------------------------------------------
@Override
public ValueExtractor getValueExtractor()
{
return f_extractor;
}
@Override
public boolean isOrdered()
{
return f_fOrdered;
}
@Override
public boolean isPartial()
{
for (Map, MapIndex> mapPart : f_mapPartitioned.values())
{
MapIndex mapIndex = mapPart.get(f_extractor);
if (mapIndex != null && mapIndex.isPartial())
{
return true;
}
}
return false;
}
@Override
public Map> getIndexContents()
{
return isOrdered()
? new SortedIndexContents()
: new IndexContents();
}
@Override
public Object get(K key)
{
int nPart = f_ctx.getManagerContext().getKeyPartition(key);
MapIndex mapIndex = getMapIndex(nPart, f_extractor);
return mapIndex == null ? NO_VALUE : mapIndex.get(key);
}
@Override
public Comparator getComparator()
{
return f_comparator;
}
@Override
public void insert(Entry entry)
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
@Override
public void update(Entry entry)
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
@Override
public void delete(Entry entry)
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
@Override
public long getUnits()
{
long cUnits = 0;
for (int nPart : getPartitions())
{
MapIndex mapIndex = getMapIndex(nPart, f_extractor);
cUnits += (mapIndex != null ? mapIndex.getUnits() : 0);
}
return Math.round(cUnits * 1.1);
}
// ---- Object methods ----------------------------------------------
@Override
public String toString()
{
return toString(false);
}
/**
* Returns a string representation of this PartitionedIndex. If called in
* verbose mode, include the contents of the index (the inverse
* index). Otherwise, just print the number of entries in the index.
*
* @param fVerbose if true then print the content of the index otherwise
* print the number of entries
*
* @return a String representation of this PartitionedIndex
*/
public String toString(boolean fVerbose)
{
return ClassHelper.getSimpleName(getClass())
+ ": Extractor=" + getValueExtractor()
+ ", Ordered=" + isOrdered()
+ ", Footprint=" + Base.toMemorySizeString(getUnits(), false)
+ (fVerbose ? ", Content[" + getIndexContents().size() + "]=" + getIndexContents().keySet() : "");
}
// ---- inner class: IndexContents ----------------------------------
/**
* Provides composite view over the contents/inverse maps of unordered
* partitioned indices.
*/
private class IndexContents
implements Map>
{
// ---- Map interface -------------------------------------------
@Override
public int size()
{
return keySet().size();
}
@Override
public boolean isEmpty()
{
for (int nPart : getPartitions())
{
if (!getIndexContents(nPart).isEmpty())
{
return false;
}
}
return true;
}
@Override
public boolean containsKey(Object oKey)
{
for (int nPart : getPartitions())
{
if (getIndexContents(nPart).containsKey(oKey))
{
return true;
}
}
return false;
}
@Override
public boolean containsValue(Object oValue)
{
return values().contains(oValue);
}
@Override
public Set get(Object oKey)
{
int cCapacity = f_partitions == null
? f_mapPartitioned.size()
: f_partitions.cardinality();
List> listKeySets = new ArrayList(cCapacity);
for (int nPart : getPartitions())
{
Set setKeys = getIndexContents(nPart).get(oKey);
if (setKeys != null && !setKeys.isEmpty())
{
listKeySets.add(setKeys);
}
}
return new ChainedSet<>(listKeySets);
}
@Override
public Set put(E key, Set value)
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
@Override
public Set remove(Object key)
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
@Override
@SuppressWarnings("NullableProblems")
public void putAll(Map> m)
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
@Override
public void clear()
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
@Override
public Set keySet()
{
Set setKeys = instantiateKeySet();
for (int nPart : getPartitions())
{
setKeys.addAll(getIndexContents(nPart).keySet());
}
return setKeys;
}
@Override
public Collection> values()
{
Set setKeys = keySet();
return new AbstractCollection()
{
public Iterator> iterator()
{
Iterator itKeys = setKeys.iterator();
return new Iterator()
{
public boolean hasNext()
{
return itKeys.hasNext();
}
public Set next()
{
return get(itKeys.next());
}
};
}
public int size()
{
return setKeys.size();
}
};
}
@Override
public Set>> entrySet()
{
Set setKeys = keySet();
return new AbstractSet()
{
public Iterator>> iterator()
{
Iterator itKeys = setKeys.iterator();
return new Iterator()
{
public boolean hasNext()
{
return itKeys.hasNext();
}
public Map.Entry> next()
{
return new Entry(itKeys.next());
}
};
}
public int size()
{
return setKeys.size();
}
};
}
// ---- helpers -------------------------------------------------
/**
* Returns an empty map (immutable).
*
* @return the empty map
*/
protected Map> emptyMap()
{
return (Map>) SegmentedHashMap.EMPTY;
}
/**
* Instantiate a set to collect the keys into.
*
* @return the set to collect the keys into
*/
protected Set instantiateKeySet()
{
return new HashSet<>();
}
/**
* Return the index contents for the specified partition.
*
* @param nPart the partition to get index contents for
*
* @return the index contents for the specified partition
*/
protected Map> getIndexContents(int nPart)
{
MapIndex mapIndex = getMapIndex(nPart, f_extractor);
return mapIndex != null
? mapIndex.getIndexContents()
: emptyMap();
}
// ---- inner class: Entry --------------------------------------
/**
* Virtual inverse index Entry.
*/
class Entry implements Map.Entry>
{
/**
* Construct an {@code Entry}.
*
* @param key the key for this entry
*/
Entry(E key)
{
f_key = key;
}
@Override
public E getKey()
{
return f_key;
}
@Override
public Set getValue()
{
return get(f_key);
}
@Override
public Set setValue(Set value)
{
throw new UnsupportedOperationException("PartitionedIndex is read-only");
}
// ---- data members ----------------------------------------
/**
* The key for this Entry.
*/
private final E f_key;
}
}
// ---- inner class: SortedIndexContents ----------------------------
/**
* Provides composite view over the contents/inverse maps of ordered
* partitioned indices.
*/
@SuppressWarnings("NullableProblems")
class SortedIndexContents
extends IndexContents
implements SortedMap>
{
// ---- SortedMap interface -------------------------------------
@Override
public Comparator comparator()
{
return f_comparator;
}
@Override
public SortedMap> subMap(E fromKey, E toKey)
{
SafeSortedMap mapSorted = new SafeSortedMap(f_comparator);
for (int nPart : getPartitions())
{
Map> subMap = getIndexContents(nPart).subMap(fromKey, toKey);
subMap.forEach((k, v) -> mapSorted.merge(k, v, (v1, v2) -> chainSets((Set) v1, (Set) v2)));
}
return mapSorted;
}
@Override
public SortedMap> headMap(E toKey)
{
SafeSortedMap mapSorted = new SafeSortedMap(f_comparator);
for (int nPart : getPartitions())
{
Map> headMap = getIndexContents(nPart).headMap(toKey);
headMap.forEach((k, v) -> mapSorted.merge(k, v, (v1, v2) -> chainSets((Set) v1, (Set) v2)));
}
return mapSorted;
}
@Override
public SortedMap> tailMap(E fromKey)
{
SafeSortedMap mapSorted = new SafeSortedMap(f_comparator);
for (int nPart : getPartitions())
{
Map> tailMap = getIndexContents(nPart).tailMap(fromKey);
tailMap.forEach((k, v) -> mapSorted.merge(k, v, (v1, v2) -> chainSets((Set) v1, (Set) v2)));
}
return mapSorted;
}
@Override
public SortedSet keySet()
{
return (SortedSet) super.keySet();
}
@Override
public E firstKey()
{
return keySet().first();
}
@Override
public E lastKey()
{
return keySet().last();
}
// ---- helpers -------------------------------------------------
@Override
protected Map> emptyMap()
{
return (Map>) SafeSortedMap.EMPTY;
}
@Override
protected SortedSet instantiateKeySet()
{
return new TreeSet<>(f_comparator);
}
@Override
protected SortedMap> getIndexContents(int nPart)
{
return (SortedMap>) super.getIndexContents(nPart);
}
/**
* Create {@link ChainedSet} from two {@code Set}s or an existing
* {@code ChainedSet} and another {@code Set}.
*
* @param setFirst the first Set; could be a ChainedSet
* @param setSecond the second Set
*
* @return a ChainedSet view over specified Sets
*/
private Set chainSets(Set setFirst, Set setSecond)
{
return setFirst instanceof ChainedSet
? new ChainedSet<>((ChainedSet) setFirst, setSecond)
: new ChainedSet<>(setFirst, setSecond);
}
}
// ---- data members ------------------------------------------------
/**
* The extractor for this index.
*/
private final ValueExtractor f_extractor;
/**
* Flag specifying whether this index is ordered.
*/
private final boolean f_fOrdered;
/**
* The Comparator to use for sorting, or {@code null} if natural
* ordering should be used.
*/
private final Comparator f_comparator;
}
// ---- data members ----------------------------------------------------
/**
* The {@link BackingMapContext context} associated with the indexed cache.
*/
protected final BackingMapContext f_ctx;
/**
* The map of partition indices, keyed by partition number.
*/
protected final Map, MapIndex>> f_mapPartitioned;
/**
* The set of partitions to create an index map for. Could be {@code null},
* in which case all partitions owned by the local member should be included
* into this index map.
*/
protected final PartitionSet f_partitions;
}