Package org.aksw.commons.util.ref

Class SingletonLazyRef<T>

java.lang.Object

org.aksw.commons.util.ref.SingletonLazyRef<T>

All Implemented Interfaces:

Serializable, Supplier<Ref<T>>

public class SingletonLazyRef<T>
extends Object
implements Supplier<Ref<T>>, Serializable

A wrapper that turns a supplier of references into a singleton such that at any given time (on a specific jvm) only a most a single reference will have been acquired from that supplier. The intended use case is to allow for sharing a supplier of a DataSource across a cluster. Each involved jvm may obtain its own singleton instnance from that supplier such that there is only one connection pool per jvm from where connections can be drawn.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected String	instanceId
protected Supplier<? extends Ref<T>>	refSupplier

Constructor Summary

Constructors

Constructor	Description
SingletonLazyRef(String instanceId, Supplier<? extends Ref<T>> refSupplier)

Method Summary

Modifier and Type	Method	Description
static <T> SingletonLazyRef<T>	create(String id, Supplier<? extends Ref<T>> refSupp)
static <T> SingletonLazyRef<T>	create(Supplier<? extends Ref<T>> refSupp)
Ref<T>	get()	Every call to .get() returns a fresh reference that must eventually be released!

Methods inherited from class java.lang.Object

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

Field Details

instanceId

protected String instanceId

refSupplier

protected Supplier<? extends Ref<T>> refSupplier

Constructor Details

SingletonLazyRef

public SingletonLazyRef(String instanceId,
 Supplier<? extends Ref<T>> refSupplier)

Method Details

create

public static <T> SingletonLazyRef<T> create(String id,
 Supplier<? extends Ref<T>> refSupp)

create

public static <T> SingletonLazyRef<T> create(Supplier<? extends Ref<T>> refSupp)

get

public Ref<T> get()

Every call to .get() returns a fresh reference that must eventually be released!

Specified by:

get in interface Supplier<T>