com.netflix.hystrix.metric.consumer

Class HealthCountsStream

java.lang.Object

com.netflix.hystrix.metric.consumer.BucketedCounterStream<Event,Bucket,Output>

com.netflix.hystrix.metric.consumer.BucketedRollingCounterStream<HystrixCommandCompletion,long[],HystrixCommandMetrics.HealthCounts>

com.netflix.hystrix.metric.consumer.HealthCountsStream

public class HealthCountsStream
extends BucketedRollingCounterStream<HystrixCommandCompletion,long[],HystrixCommandMetrics.HealthCounts>

Maintains a stream of rolling health counts for a given Command. There is a rolling window abstraction on this stream. The HealthCounts object is calculated over a window of t1 milliseconds. This window has b buckets. Therefore, a new HealthCounts object is produced every t2 (=t1/b) milliseconds t1 = HystrixCommandProperties.metricsHealthSnapshotIntervalInMilliseconds() b = HystrixCommandProperties.metricsRollingStatisticalWindowBuckets() These values are stable - there's no peeking into a bucket until it is emitted These values get produced and cached in this class. This value (the latest observed value) may be queried using BucketedCounterStream.getLatest().

Field Summary

Fields inherited from class com.netflix.hystrix.metric.consumer.BucketedCounterStream

bucketedStream, numBuckets, subscription

Method Summary

Methods

Modifier and Type	Method and Description
static HealthCountsStream	getInstance(HystrixCommandKey commandKey, HystrixCommandProperties properties)
static HealthCountsStream	getInstance(HystrixCommandKey commandKey, int numBuckets, int bucketSizeInMs)
static void	removeByKey(HystrixCommandKey key)
static void	reset()

Methods inherited from class com.netflix.hystrix.metric.consumer.BucketedRollingCounterStream

observe

Methods inherited from class com.netflix.hystrix.metric.consumer.BucketedCounterStream

getLatest, startCachingStreamValuesIfUnstarted, unsubscribe

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getInstance

public static HealthCountsStream getInstance(HystrixCommandKey commandKey,
                             HystrixCommandProperties properties)

getInstance

public static HealthCountsStream getInstance(HystrixCommandKey commandKey,
                             int numBuckets,
                             int bucketSizeInMs)

reset

public static void reset()

removeByKey

public static void removeByKey(HystrixCommandKey key)