/**
* Atomically checks if a given flag is set and - if not - sets it. When multiple threads
* concurrently call this method with the same flag, only one of them will be able to set the flag
*
* @param flag
* @return True if the flag could be set, false if not (was already set)
*/
public boolean setTransientFlagIfAbsent(byte flag) {
if (flag > Byte.MAX_VALUE || flag < 0)
throw new IllegalArgumentException("flag has to be >= 0 and <= " + Byte.MAX_VALUE);
synchronized (this) {
if (isTransientFlagSet(flag)) return false;
else setTransientFlag(flag);
return true;
}
}
/**
* Atomically checks if a given flag is set and - if not - sets it. When multiple threads
* concurrently call this method with the same flag, only one of them will be able to set the flag
*
* @param flag
* @return True if the flag could be set, false if not (was already set)
*/
public synchronized boolean setTransientFlagIfAbsent(TransientFlag flag) {
if (isTransientFlagSet(flag)) return false;
setTransientFlag(flag);
return true;
}