36 lines
1.2 KiB
Objective-C
36 lines
1.2 KiB
Objective-C
#import "EventWindow.h"
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@implementation EventWindow
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+(EventWindow*) eventWindowWithWindowDuration:(NSTimeInterval)windowDuration {
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require(windowDuration >= 0);
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EventWindow* w = [EventWindow new];
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w->windowDuration = windowDuration;
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w->events = [PriorityQueue priorityQueueAscendingWithComparator:^NSComparisonResult(id obj1, id obj2) {
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return [(NSNumber*)obj1 compare:(NSNumber*)obj2];
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}];
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w->lastWindowEnding = -INFINITY;
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return w;
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}
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-(void) addEventAtTime:(NSTimeInterval)eventTime {
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[events enqueue:@(eventTime)];
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}
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-(NSUInteger) countAfterRemovingEventsBeforeWindowEndingAt:(NSTimeInterval)endOfWindowTime {
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// because values are removed, going backwards will give misleading results.
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// checking for this case so callers don't get silent bad results
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// includes a small leeway in case of non-monotonic time source or extended precision lose
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requireState(endOfWindowTime >= lastWindowEnding-0.03);
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lastWindowEnding = endOfWindowTime;
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NSTimeInterval startOfWindowTime = endOfWindowTime - windowDuration;
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while(events.count > 0 && [events.peek doubleValue] < startOfWindowTime) {
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[events dequeue];
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}
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return events.count;
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}
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@end
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