/**
* Method cleans up all events that either outnumber queue size or exceeds time-to-live value. It
* does none if someone else cleans up queue (lock is locked) or if there are queue readers
* (readersNum > 0).
*/
private void cleanupQueue() {
long now = U.currentTimeMillis();
long queueOversize = evts.sizex() - expireCnt;
for (int i = 0; i < queueOversize && evts.sizex() > expireCnt; i++) {
GridEvent expired = evts.poll();
if (log.isDebugEnabled()) log.debug("Event expired by count: " + expired);
}
while (true) {
ConcurrentLinkedDeque8.Node<GridEvent> node = evts.peekx();
if (node == null) // Queue is empty.
break;
GridEvent evt = node.item();
if (evt == null) // Competing with another thread.
continue;
if (now - evt.timestamp() < expireAgeMs) break;
if (evts.unlinkx(node) && log.isDebugEnabled())
log.debug("Event expired by age: " + node.item());
}
}
/** {@inheritDoc} */
@Override
public void spiStop() throws GridSpiException {
unregisterMBean();
// Reset events.
evts.clear();
// Ack ok stop.
if (log.isDebugEnabled()) log.debug(stopInfo());
}
/** {@inheritDoc} */
@Override
public void record(GridEvent evt) throws GridSpiException {
assert evt != null;
// Filter out events.
if (filter == null || filter.apply(evt)) {
cleanupQueue();
evts.add(evt);
// Make sure to filter out metrics updates to prevent log from flooding.
if (evt.type() != EVT_NODE_METRICS_UPDATED && log.isDebugEnabled())
log.debug("Event recorded: " + evt);
}
}
/** {@inheritDoc} */
@Override
public void spiStart(String gridName) throws GridSpiException {
// Start SPI start stopwatch.
startStopwatch();
assertParameter(expireCnt > 0, "expireCnt > 0");
assertParameter(expireAgeMs > 0, "expireAgeMs > 0");
// Ack parameters.
if (log.isDebugEnabled()) {
log.debug(configInfo("expireAgeMs", expireAgeMs));
log.debug(configInfo("expireCnt", expireCnt));
}
registerMBean(gridName, this, GridMemoryEventStorageSpiMBean.class);
// Ack ok start.
if (log.isDebugEnabled()) log.debug(startInfo());
}