org.ros.concurrent
Class Holder<T>

java.lang.Object
  org.ros.concurrent.Holder<T>

public class Holder<T>
extends java.lang.Object

A mutable object that may contain a value to another object. It is modifiable exactly once and must hold a non-null value when the value is inspected.

Holders are intended for receiving a result from an anonymous class.

Note that Holder is not thread safe. For a thread safe implementation, use AtomicReference. Also note that two different Holder instances are never considered equal.

Method Summary

void	await()
boolean	await(long timeout, java.util.concurrent.TimeUnit unit)
boolean	equals(java.lang.Object obj)
T	get()
static <T> Holder<T>	newEmpty()
T	set(T value)

Methods inherited from class java.lang.Object

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

Method Detail

newEmpty

public static <T> Holder<T> newEmpty()

set

public T set(T value)

get

public T get()

await

public void await()
           throws java.lang.InterruptedException

Throws:

java.lang.InterruptedException

await

public boolean await(long timeout,
                     java.util.concurrent.TimeUnit unit)
              throws java.lang.InterruptedException

Throws:

java.lang.InterruptedException

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object