synchronizedobjectholder.java

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package com.lti.utils.synchronization;

/**
 * 
 * @author Ken Larson
 *
 */
public class SynchronizedObjectHolder<T>
{

	public SynchronizedObjectHolder()
	{
		super();
	}
	
	public SynchronizedObjectHolder(T value)
	{	setObject(value);
	}
	
	private T object;
	
	public synchronized void setObject(T value)
	{
		object = value;
		notifyAll();
		
	}
	
	public synchronized T getObject()
	{
		return object;
	}
	
	public synchronized void waitUntilNotNull() throws InterruptedException
	{	while (object == null)
		{
			wait();
		}
			
	}
	
	/**
	 * @return true if value is now non-null, false if timeout occurred
	 */
	public synchronized boolean waitUntilNotNull(int timeout) throws InterruptedException
	{	long start = System.currentTimeMillis();
		while (object == null)
		{	long now = System.currentTimeMillis();
			long diff = now - start;
			long wait = timeout - diff;
			if (wait <= 0)
				return false;
			wait(wait);
		}
		return true;
	
	}	
}