File	Doc	Category	Size	Date	Package
UniqueIdGenerator.java	API Doc	Glassfish v2 API	4774	Fri May 04 22:35:00 BST 2007	com.sun.enterprise.instance

UniqueIdGenerator

• java.lang.Object

Fields Summary
private long	_lastUid last unique id given out by this id generator
private static UniqueIdGenerator	_instance the singleton instance
private static Logger	_logger

Constructors Summary
private UniqueIdGenerator() _instance = new UniqueIdGenerator();

Methods Summary
public static com.sun.enterprise.instance.UniqueIdGenerator	getInstance() Returns the singleton instance of this class. return the singleton instance return _instance;
public long	getNextUniqueId() Returns the next unique id for an application or stand alone ejb module. return the next unique id synchronized (this) { while (true) { long uid = System.currentTimeMillis(); // uses the low order 6 bytes as unique id; // remaining 2 bytes are reserved for the beans inside the app uid = (uid << 16); // ensures that we have a unique id if (this._lastUid != uid) { this._lastUid = uid; break; } else { try { Thread.currentThread().sleep(1); } catch (InterruptedException ie) { // log debug msg here _logger.log(Level.WARNING,"Thread.sleep interrupted ",ie); } } } return this._lastUid; }