protected Object handleDownMessage(final Event evt, final Message msg, Address dest, int length) {
if (dest == null) { // 2nd line of defense, not really needed
log.error(
getClass().getSimpleName() + " doesn't handle multicast messages; passing message down");
return down_prot.down(evt);
}
Credit cred = sent.get(dest);
if (cred == null) return down_prot.down(evt);
long block_time = max_block_times != null ? getMaxBlockTime(length) : max_block_time;
while (running && sent.containsKey(dest)) {
boolean rc = cred.decrementIfEnoughCredits(length, block_time);
if (rc || !running || max_block_times != null) break;
if (cred.needToSendCreditRequest())
sendCreditRequest(dest, Math.max(0, max_credits - cred.get()));
}
// send message - either after regular processing, or after blocking (when enough credits
// available again)
return down_prot.down(evt);
}
