org.apache.solr.util

Class RefCounted<Type>

java.lang.Object

org.apache.solr.util.RefCounted<Type>

public abstract class RefCounted<Type>
extends Object

Keep track of a reference count on a resource and close it when the count hits zero. By itself, this class could have some race conditions since there is no synchronization between the refcount check and the close. Solr's use in reference counting searchers is safe since the count can only hit zero if it's unregistered (and hence incref() will not be called again on it).

Version:

$Id: RefCounted.java 779125 2009-05-27 11:58:18Z noble $

Field Summary

Fields

Modifier and Type	Field and Description
protected AtomicInteger	refcount
protected Type	resource

Constructor Summary

Constructors

Constructor and Description
RefCounted(Type resource)

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract void	close()
void	decref()
Type	get()
int	getRefcount()
RefCounted<Type>	incref()

Methods inherited from class java.lang.Object

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

Field Detail

resource

protected final Type resource

refcount

protected final AtomicInteger refcount

Constructor Detail

RefCounted

public RefCounted(Type resource)

Method Detail

getRefcount

public int getRefcount()

incref

public final RefCounted<Type> incref()

get

public final Type get()

decref

public void decref()

close

protected abstract void close()