edu.illinois.cs.cogcomp.wikifier.utils.concurrent

Class Init<V>

java.lang.Object

edu.illinois.cs.cogcomp.wikifier.utils.concurrent.Init<V>

Type Parameters:

V -

public abstract class Init<V>
extends Object

Useful for concurrent map initialization

Author:

cheng88

Field Summary

Fields

Modifier and Type	Field and Description
static Init<AtomicInteger>	newAtmInt
static Init<ConcurrentHashMap<Integer,AtomicInteger>>	newCountMap
static Init<gnu.trove.list.array.TIntArrayList>	newIntList
static Init<LinkedList<Integer>>	newLkdList
static Init<gnu.trove.map.hash.TIntIntHashMap>	newTIntMap

Constructor Summary

Constructors

Constructor and Description
Init()

Method Summary

Modifier and Type	Method and Description
static <K,V> V	fastGet(Map<K,V> map, K key, Init<V> initiailzer) Non thread-safe version of getOrCreate(ConcurrentMap, Object, Init) without writing to the map
static <K,V> V	getOrCreate(ConcurrentMap<K,V> map, K key, Init<V> initiailzer) Atomic initialization and gets for concurrent maps.
abstract V	init()

Methods inherited from class java.lang.Object

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

Field Detail

newAtmInt

public static final Init<AtomicInteger> newAtmInt

newLkdList

public static final Init<LinkedList<Integer>> newLkdList

newIntList

public static final Init<gnu.trove.list.array.TIntArrayList> newIntList

newTIntMap

public static final Init<gnu.trove.map.hash.TIntIntHashMap> newTIntMap

newCountMap

public static final Init<ConcurrentHashMap<Integer,AtomicInteger>> newCountMap

Constructor Detail

Init

public Init()

Method Detail

init

public abstract V init()

fastGet

public static <K,V> V fastGet(Map<K,V> map,
                              K key,
                              Init<V> initiailzer)

Non thread-safe version of getOrCreate(ConcurrentMap, Object, Init) without writing to the map

Parameters:

map -

key -

initiailzer -

Returns:

getOrCreate

public static <K,V> V getOrCreate(ConcurrentMap<K,V> map,
                                  K key,
                                  Init<V> initiailzer)

Atomic initialization and gets for concurrent maps. Note that mapdb's get(key) method only returns cached values. To update record, write-back is required

Parameters:

map -

key -

initiailzer -

Returns:

the existing value corresponding to the key or a new value created by initializer