protected void handleViewChange(List<Address> mbrs) {
super.handleViewChange(mbrs);
Set<Address> keys = new HashSet<Address>(credits.keys());
for (Address key : keys) {
if (!mbrs.contains(key)) credits.remove(key);
}
for (Address key : mbrs) credits.putIfAbsent(key);
}
protected void handleCredit(Address sender, long increase) {
credits.replenish(sender, increase);
if (log.isTraceEnabled()) {
StringBuilder sb = new StringBuilder();
sb.append("received " + increase + " credits from ")
.append(sender)
.append(", new credits for " + sender + " : ")
.append(credits.get(sender) + ", min_credits=" + credits.getMinCredits());
log.trace(sb);
}
}
protected Object handleDownMessage(final Event evt, final Message msg, Address dest, int length) {
if (dest != null) // 2nd line of defense, not really needed
return down_prot.down(evt);
long block_time = max_block_times != null ? getMaxBlockTime(length) : max_block_time;
while (running) {
boolean rc = credits.decrement(length, block_time);
if (rc || max_block_times != null || !running) break;
if (needToSendCreditRequest()) {
List<Tuple<Address, Long>> targets = credits.getMembersWithCreditsLessThan(min_credits);
for (Tuple<Address, Long> tuple : targets)
sendCreditRequest(tuple.getVal1(), Math.min(max_credits, max_credits - tuple.getVal2()));
}
}
// send message - either after regular processing, or after blocking (when enough credits are
// available again)
return down_prot.down(evt);
}
public void stop() {
super.stop();
credits.clear();
}
@ManagedAttribute(description = "Total time (ms) spent in flow control block")
public long getTotalTimeBlocked() {
return credits.getTotalBlockTime();
}
@ManagedAttribute(description = "Number of times flow control blocks sender")
public int getNumberOfBlockings() {
return credits.getNumBlockings();
}
@ManagedOperation(description = "Print sender credits")
public String printSenderCredits() {
return credits.toString();
}
@ManagedOperation(description = "Print credits")
public String printCredits() {
return super.printCredits()
+ "\nsenders min credits: "
+ credits.computeLowestCreditWithAccumulated();
}
/** Allows to unblock a blocked sender from an external program, e.g. JMX */
@ManagedOperation(description = "Unblock a sender")
public void unblock() {
if (log.isTraceEnabled()) log.trace("unblocking the sender and replenishing all members");
credits.replenishAll();
}
