ConcurrentBox.java from DrJava at Krugle
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/*BEGIN_COPYRIGHT_BLOCK*
PLT Utilities BSD License
Copyright (c) 2007 JavaPLT group at Rice University
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Developed by: Java Programming Languages Team
Rice University
http://www.cs.rice.edu/~javaplt/
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package edu.rice.cs.plt.concurrent;
import java.io.Serializable;
import edu.rice.cs.plt.lambda.Box;
/**
* <p>A thread-safe box implementation.</p>
*
* <p>As a wrapper for arbitrary objects, instances of this class will serialize without error
* only if the wrapped object is serializable.</p>
*/
public class ConcurrentBox<T> implements Box<T>, Serializable {
private volatile T _val;
/** Create a box initialized with {@code val} */
public ConcurrentBox(T val) { _val = val; }
/** Create a box initialized with {@code null} */
public ConcurrentBox() { _val = null; }
public void set(T val) { _val = val; }
public T value() { return _val; }
/** Call the constructor (allows {@code T} to be inferred) */
public static <T> ConcurrentBox<T> make(T val) { return new ConcurrentBox<T>(val); }
/** Call the constructor (allows {@code T} to be inferred) */
public static <T> ConcurrentBox<T> make() { return new ConcurrentBox<T>(); }
}
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