private void updateAccumulatedBuildTime(BuildRuleEvent buildRuleEvent) {
Optional<? extends BuildRuleEvent> started =
Preconditions.checkNotNull(
threadsToRunningBuildRuleEvent.put(
buildRuleEvent.getThreadId(), Optional.<BuildRuleEvent>absent()));
Preconditions.checkState(started.isPresent());
Preconditions.checkState(buildRuleEvent.getBuildRule().equals(started.get().getBuildRule()));
AtomicLong current = accumulatedRuleTime.get(buildRuleEvent.getBuildRule().getBuildTarget());
// It's technically possible that another thread receives resumed and finished events
// while we're processing this one, so we have to check that the current counter exists.
if (current != null) {
current.getAndAdd(buildRuleEvent.getTimestamp() - started.get().getTimestamp());
}
}
