org.apache.qpid.proton.engine

Class ExtendableAccessor<E extends Extendable,T>

java.lang.Object

org.apache.qpid.proton.engine.ExtendableAccessor<E,T>

Type Parameters:

E - An Extendable type where the data is to be stored

T - The type of the data to be stored

public final class ExtendableAccessor<E extends Extendable,T>
extends Object

A typesafe convenience class for associating additional data with Extendable classes.

An instance of ExtendableAccessor uses itself as the key in the Extendable.attachments() so it's best instantiated as a static final member.

   class Foo extends BaseHandler {
     private static ExtendableAccessor<Link, Bar> LINK_BAR = new ExtendableAccessor<>(Bar.class);
     void onLinkRemoteOpen(Event e) {
       Bar bar = LINK_BAR.get(e.getLink());
       if (bar == null) {
         bar = new Bar();
         LINK_BAR.set(e.getLink(), bar);
         }
       }
     }
 

Constructor Summary

Constructors

Constructor and Description
ExtendableAccessor(Class<T> klass)

Method Summary

Methods

Modifier and Type	Method and Description
T	get(E e)
void	set(E e, T value)

Methods inherited from class java.lang.Object

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

Constructor Detail

ExtendableAccessor

public ExtendableAccessor(Class<T> klass)

Method Detail

get

public T get(E e)

set

public void set(E e,
       T value)