nl_tokens: Called on reception of a NAK to start retransmits handling .
pl_tokens: public void onNak ( final int termId , final int termOffset , final int length , final int termLength , final RetransmitSender retransmitSender ) { if ( ! isInvalid ( termOffset , termLength ) ) { if ( null == activeRetransmitsMap . get ( termId , termOffset ) && activeRetransmitsMap . size ( ) < MAX_RETRANSMITS_DEFAULT ) { final RetransmitAction action = assignRetransmitAction ( ) ; action . termId = termId ; action . termOffset = termOffset ; action . length = Math . <mask> ( length , termLength - termOffset ) ; final long delay = delayGenerator . generateDelay ( ) ; if ( 0 == delay ) { retransmitSender . resend ( termId , termOffset , action . length ) ; action . linger ( lingerTimeoutGenerator . generateDelay ( ) , nanoClock . nanoTime ( ) ) ; } else { action . delay ( delay , nanoClock . nanoTime ( ) ) ; } activeRetransmitsMap . put ( termId , termOffset , action ) ; } } }