public static synchronized String genTimeMillisId ( ) { String ret ; ID_GEN_LOCK . lock ( ) ; try { ret = String . valueOf ( System . currentTimeMillis ( ) ) ; try { Thread . sleep ( ID_GEN_SLEEP_MILLIS ) ; } catch ( final InterruptedException e ) { throw new RuntimeException ( "Generates time millis id fail" ) ; } } finally { ID_GEN_LOCK . unlock ( ) ; } return ret ; }
Gets current date time string .