protected BucketedRollingCounterStream(IHystrixEventStream <Event> stream, int numBuckets, int bucketSizeInMs, Func <Bucket, Event, Bucket> appendRawEventToBucket, Func <Output, Bucket, Output> reduceBucket)
: base(stream, numBuckets, bucketSizeInMs, appendRawEventToBucket)
{
Func <IObservable <Bucket>, IObservable <Output> > reduceWindowToSummary = (window) =>
{
var result = window.Aggregate(EmptyOutputValue, (arg1, arg2) => reduceBucket(arg1, arg2)).Select(n => n);
return(result);
};
counterSubject = new BehaviorSubject <Output>(EmptyOutputValue);
_sourceStream = bucketedStream // stream broken up into buckets
.Window(numBuckets, 1) // emit overlapping windows of buckets
.FlatMap((w) =>
reduceWindowToSummary(w)) // convert a window of bucket-summaries into a single summary
.OnSubscribe(() =>
{
_isSourceCurrentlySubscribed.Value = true;
})
.OnDispose(() =>
{
_isSourceCurrentlySubscribed.Value = false;
})
.Publish().RefCount(); // multiple subscribers should get same data
}
protected RollingDistributionStream(IHystrixEventStream <Event> stream, int numBuckets, int bucketSizeInMs, Func <LongHistogram, Event, LongHistogram> addValuesToBucket)
{
var emptyDistributionsToStart = new List <LongHistogram>();
for (var i = 0; i < numBuckets; i++)
{
emptyDistributionsToStart.Add(CachedValuesHistogram.GetNewHistogram());
}
Func <IObservable <Event>, IObservable <LongHistogram> > reduceBucketToSingleDistribution = (bucket) =>
{
var result = bucket.Aggregate(CachedValuesHistogram.GetNewHistogram(), (arg1, arg2) => addValuesToBucket(arg1, arg2)).Select(n => n);
return(result);
};
_rollingDistributionStream = stream
.Observe()
.Window(TimeSpan.FromMilliseconds(bucketSizeInMs), NewThreadScheduler.Default) // stream of unaggregated buckets
.SelectMany((d) => reduceBucketToSingleDistribution(d)) // stream of aggregated Histograms
.StartWith(emptyDistributionsToStart) // stream of aggregated Histograms that starts with n empty
.Window(numBuckets, 1) // windowed stream: each OnNext is a stream of n Histograms
.SelectMany((w) => ReduceWindowToSingleDistribution(w)) // reduced stream: each OnNext is a single Histogram
.Map((h) => CacheHistogramValues(h)) // convert to CachedValueHistogram (commonly-accessed values are cached)
.Publish().RefCount();
}
protected BucketedCounterStream(IHystrixEventStream <Event> inputEventStream, int numBuckets, int bucketSizeInMs, Func <Bucket, Event, Bucket> appendRawEventToBucket)
{
this.numBuckets = numBuckets;
this.bucketSizeInMs = bucketSizeInMs;
_reduceBucketToSummary = (eventsObservable) =>
{
var result = eventsObservable.Aggregate(EmptyBucketSummary, (arg1, arg2) => appendRawEventToBucket(arg1, arg2)).Select(n => n);
return(result);
};
IList <Bucket> emptyEventCountsToStart = new List <Bucket>();
for (var i = 0; i < numBuckets; i++)
{
emptyEventCountsToStart.Add(EmptyBucketSummary);
}
bucketedStream = Observable.Defer(() =>
{
return(inputEventStream
.Observe()
.Window(TimeSpan.FromMilliseconds(bucketSizeInMs), NewThreadScheduler.Default) // bucket it by the counter window so we can emit to the next operator in time chunks, not on every OnNext
.SelectMany((b) =>
{
return _reduceBucketToSummary(b);
})
.StartWith(emptyEventCountsToStart)); // start it with empty arrays to make consumer logic as generic as possible (windows are always full)
});
}
protected BucketedCumulativeCounterStream(IHystrixEventStream <Event> stream, int numBuckets, int bucketSizeInMs, Func <Bucket, Event, Bucket> reduceCommandCompletion, Func <Output, Bucket, Output> reduceBucket)
: base(stream, numBuckets, bucketSizeInMs, reduceCommandCompletion)
{
this.counterSubject = new BehaviorSubject <Output>(EmptyOutputValue);
this.sourceStream = bucketedStream
.Scan(EmptyOutputValue, (arg1, arg2) => reduceBucket(arg1, arg2))
.Skip(numBuckets)
.OnSubscribe(() => { isSourceCurrentlySubscribed.Value = true; })
.OnDispose(() => { isSourceCurrentlySubscribed.Value = false; })
.Publish().RefCount(); // multiple subscribers should get same data
}
protected RollingConcurrencyStream(IHystrixEventStream <HystrixCommandExecutionStarted> inputEventStream, int numBuckets, int bucketSizeInMs)
{
List <int> emptyRollingMaxBuckets = new List <int>();
for (int i = 0; i < numBuckets; i++)
{
emptyRollingMaxBuckets.Add(0);
}
rollingMaxStream = inputEventStream
.Observe()
.Map((arg) => GetConcurrencyCountFromEvent(arg))
.Window(TimeSpan.FromMilliseconds(bucketSizeInMs))
.SelectMany((arg) => ReduceStreamToMax(arg))
.StartWith(emptyRollingMaxBuckets)
.Window(numBuckets, 1)
.SelectMany((arg) => ReduceStreamToMax(arg))
.Publish().RefCount();
}