protected StatSampler(StatCollector s) {
this.id = s.getId() + "_MAX";
this.stat = s;
final Runnable runnable =
new Runnable() {
public void run() {
if (!hasStarted.get()) {
return;
}
try {
final long newVal = stat.getVal();
synchronized (value) {
final long val = value.get();
if (Math.abs(newVal) > Math.abs(val)) {
value.set(newVal);
}
exceptionRef.set(null);
}
} catch (StatUnreachableException e) {
exceptionRef.set(e);
} catch (Throwable t) {
log.error(t, t);
}
}
};
scheduleAtFixedRate(runnable, 1000);
}
public void register(final StatCollector stat) {
// can't register any stats after the collector has been initially
// started due to the need for consistent ordering in the csv output
// file
if (hasStarted.get()) {
log.warn(
stat.getId()
+ " attempted to register in stat collector although it has "
+ " already been started, not allowing");
return;
}
if (statKeys.containsKey(stat.getId())) {
log.warn(
stat.getId()
+ " attempted to register in stat collector although it has "
+ " already been registered, not allowing");
return;
}
statKeys.put(stat.getId(), stat);
}