/**
* Generate a UID, globally unique. This method relies on the configured serverId for network
* uniqueness.
*
* @return the generated UID.
*/
public static Uid generateUid() {
byte[] timestamp = Encoder.longToBytes(System.currentTimeMillis());
byte[] sequence = Encoder.intToBytes(getNextSequenceNumber());
byte[] serverId = TransactionManagerServices.getConfiguration().buildServerIdArray();
int uidLength = serverId.length + timestamp.length + sequence.length;
byte[] uidArray = new byte[uidLength];
// TODO: the server ID is encoded first but its size is variable and can change between runs.
// It should be encoded last but that would make TX logs incompatible with older versions !
System.arraycopy(serverId, 0, uidArray, 0, serverId.length);
System.arraycopy(timestamp, 0, uidArray, serverId.length, timestamp.length);
System.arraycopy(sequence, 0, uidArray, serverId.length + timestamp.length, sequence.length);
return new Uid(uidArray);
}
