com.hazelcast.util
Class SampleableConcurrentHashMap<K,V>

java.lang.Object
  java.util.AbstractMap<K,V>
      com.hazelcast.util.ConcurrentReferenceHashMap<K,V>
          com.hazelcast.util.SampleableConcurrentHashMap<K,V>

Type Parameters:

K - Type of the key

V - Type of the value

All Implemented Interfaces:

Serializable, ConcurrentMap<K,V>, Map<K,V>

Direct Known Subclasses:

CacheRecordHashMap

public class SampleableConcurrentHashMap<K,V>
extends ConcurrentReferenceHashMap<K,V>

ConcurrentHashMap to extend iterator capability.

See Also:

Serialized Form

Nested Class Summary

class	SampleableConcurrentHashMap.IterableSamplingEntry Iterable sampling entry to preventing from extra object creation for iteration.
class	SampleableConcurrentHashMap.SamplingEntry Entry to define keys and values for sampling.

Nested classes/interfaces inherited from class com.hazelcast.util.ConcurrentReferenceHashMap

ConcurrentReferenceHashMap.Option, ConcurrentReferenceHashMap.ReferenceType, ConcurrentReferenceHashMap.SimpleEntry<K,V>, ConcurrentReferenceHashMap.WriteThroughEntry

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Constructor Summary

SampleableConcurrentHashMap(int initialCapacity)

SampleableConcurrentHashMap(int initialCapacity, float loadFactor, int concurrencyLevel, ConcurrentReferenceHashMap.ReferenceType keyType, ConcurrentReferenceHashMap.ReferenceType valueType, EnumSet<ConcurrentReferenceHashMap.Option> options)

Method Summary

protected <E extends SampleableConcurrentHashMap.SamplingEntry> E	createSamplingEntry(K key, V value)
int	fetch(int tableIndex, int size, List<Data> keys) Fetches keys from given tableIndex as size and puts them into keys list.
<E extends SampleableConcurrentHashMap.SamplingEntry> Iterable<E>	getRandomSamples(int sampleCount) Gets and returns samples as sampleCount.

Methods inherited from class com.hazelcast.util.ConcurrentReferenceHashMap

clear, contains, containsKey, containsValue, elements, entrySet, get, isEmpty, keys, keySet, purgeStaleEntries, put, putAll, putIfAbsent, remove, remove, replace, replace, size, values

Methods inherited from class java.util.AbstractMap

clone, equals, hashCode, toString

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Constructor Detail

SampleableConcurrentHashMap

public SampleableConcurrentHashMap(int initialCapacity)

SampleableConcurrentHashMap

public SampleableConcurrentHashMap(int initialCapacity,
                                   float loadFactor,
                                   int concurrencyLevel,
                                   ConcurrentReferenceHashMap.ReferenceType keyType,
                                   ConcurrentReferenceHashMap.ReferenceType valueType,
                                   EnumSet<ConcurrentReferenceHashMap.Option> options)

Method Detail

fetch

public int fetch(int tableIndex,
                 int size,
                 List<Data> keys)

Fetches keys from given tableIndex as size and puts them into keys list.

Parameters:

tableIndex - Index (checkpoint) for starting point of fetch operation

size - Count of how many keys will be fetched

keys - List that fetched keys will be put into

Returns:

the next index (checkpoint) for later fetches

createSamplingEntry

protected <E extends SampleableConcurrentHashMap.SamplingEntry> E createSamplingEntry(K key,
                                                                                      V value)

getRandomSamples

public <E extends SampleableConcurrentHashMap.SamplingEntry> Iterable<E> getRandomSamples(int sampleCount)

Gets and returns samples as sampleCount.

Parameters:

sampleCount - Count of samples

Returns:

the sampled SampleableConcurrentHashMap.SamplingEntry list