Package org.apache.hadoop.fs.impl

Class WeakReferenceThreadMap<V>

java.lang.Object

org.apache.hadoop.util.WeakReferenceMap<java.lang.Long,V>

org.apache.hadoop.fs.impl.WeakReferenceThreadMap<V>

Type Parameters:

V - value type of the map

public class WeakReferenceThreadMap<V>
extends WeakReferenceMap<java.lang.Long,V>

A WeakReferenceMap for threads.

Constructor Summary

Constructors

Constructor	Description
WeakReferenceThreadMap(java.util.function.Function<? super java.lang.Long,? extends V> factory, java.util.function.Consumer<? super java.lang.Long> referenceLost)

Method Summary

Modifier and Type	Method	Description
long	currentThreadId()	Get the current thread ID.
V	getForCurrentThread()	Get the value for the current thread, creating if needed.
V	removeForCurrentThread()	Remove the reference for the current thread.
V	setForCurrentThread(V newVal)	Set the new value for the current thread.

Methods inherited from class org.apache.hadoop.util.WeakReferenceMap

clear, containsKey, create, get, getEntriesCreatedCount, getReferenceLostCount, lookup, prune, put, remove, resolve, size, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

WeakReferenceThreadMap

public WeakReferenceThreadMap(java.util.function.Function<? super java.lang.Long,? extends V> factory,
                              @Nullable
                              java.util.function.Consumer<? super java.lang.Long> referenceLost)

Method Detail

getForCurrentThread

public V getForCurrentThread()

Get the value for the current thread, creating if needed.

Returns:

an instance.

removeForCurrentThread

public V removeForCurrentThread()

Remove the reference for the current thread.

Returns:

any reference value which existed.

currentThreadId

public long currentThreadId()

Get the current thread ID.

Returns:

thread ID.

setForCurrentThread

public V setForCurrentThread(V newVal)

Set the new value for the current thread.

Parameters:

newVal - new reference to set for the active thread.

Returns:

the previously set value, possibly null