org.apache.hadoop.hbase.util

类 WeakObjectPool<K,V>

java.lang.Object

org.apache.hadoop.hbase.util.ObjectPool<K,V>

org.apache.hadoop.hbase.util.WeakObjectPool<K,V>

@InterfaceAudience.Private
public class WeakObjectPool<K,V>
extends ObjectPool<K,V>

A WeakReference based shared object pool. The objects are kept in weak references and associated with keys which are identified by the equals method. The objects are created by ObjectFactory on demand. The object creation is expected to be lightweight, and the objects may be excessively created and discarded. Thread safe.

嵌套类概要

从类继承的嵌套类/接口 org.apache.hadoop.hbase.util.ObjectPool

ObjectPool.ObjectFactory<K,V>

字段概要

从类继承的字段 org.apache.hadoop.hbase.util.ObjectPool

DEFAULT_CONCURRENCY_LEVEL, DEFAULT_INITIAL_CAPACITY, referenceCache, staleRefQueue

构造器概要

构造器

构造器和说明
WeakObjectPool(ObjectPool.ObjectFactory<K,V> objectFactory)
WeakObjectPool(ObjectPool.ObjectFactory<K,V> objectFactory, int initialCapacity)
WeakObjectPool(ObjectPool.ObjectFactory<K,V> objectFactory, int initialCapacity, int concurrencyLevel)

方法概要

限定符和类型	方法和说明
Reference<V>	createReference(K key, V obj) Create a reference associated with the given object
K	getReferenceKey(Reference<V> ref) Get key of the given reference

从类继承的方法 org.apache.hadoop.hbase.util.ObjectPool

get, purge, size

从类继承的方法 java.lang.Object

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

构造器详细资料

WeakObjectPool

public WeakObjectPool(ObjectPool.ObjectFactory<K,V> objectFactory)

WeakObjectPool

public WeakObjectPool(ObjectPool.ObjectFactory<K,V> objectFactory,
                      int initialCapacity)

WeakObjectPool

public WeakObjectPool(ObjectPool.ObjectFactory<K,V> objectFactory,
                      int initialCapacity,
                      int concurrencyLevel)

方法详细资料

createReference

public Reference<V> createReference(K key,
                                    V obj)

从类复制的说明: ObjectPool

Create a reference associated with the given object

指定者:

createReference 在类中 ObjectPool<K,V>

参数:

key - the key to store in the reference

obj - the object to associate with

返回:

the reference instance

getReferenceKey

public K getReferenceKey(Reference<V> ref)

从类复制的说明: ObjectPool

Get key of the given reference

指定者:

getReferenceKey 在类中 ObjectPool<K,V>

参数:

ref - The reference

返回:

key of the reference