Repository: alibaba/sentinel-golang
Pull request #431 (2021-09-22 09:52:15)

add a metric to monitor queued requests 
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### Describe what this PR does / why we need it

In addition to monitoring resource passage and blocking, I think I need a metric exporter to show the status of my resource queued requests



### Does this pull request fix one issue?

<!--If that, add "Fixes #xxxx" below in the next line. For example, Fixes #15. Otherwise, add "NONE" -->

### Describe how you did it
1  add a metric to monitor queued requests 
2   add empty metric exporter because if we don’t configure metric http address, we don’t need to instantiate promethues exporter
### Describe how to verify it

### Special notes for reviews
@gorexlv 


Patch:
diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index e9a16f7..046f61b 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -63,6 +63,8 @@ jobs:
         go test -race -count=1 ./... -coverprofile=coverage.txt -covermode=atomic
         cd ../nacos
         go test -race -count=1 ./... -coverprofile=coverage.txt -covermode=atomic
+        cd ../apollo
+        go test -race -count=1 ./... -coverprofile=coverage.txt -covermode=atomic
         cd ../../adapters/echo
         go test -race -count=1 ./... -coverprofile=coverage.txt -covermode=atomic
         cd ../gear
diff --git a/core/base/stat.go b/core/base/stat.go
index c4b27fc..952e53d 100644
--- a/core/base/stat.go
+++ b/core/base/stat.go
@@ -81,6 +81,7 @@ func (rs *nopReadStat) AvgRT() float64 {
 }
 
 type WriteStat interface {
+	// AddCount adds given count to the metric of provided MetricEvent.
 	AddCount(event MetricEvent, count int64)
 }
 
@@ -94,6 +95,7 @@ type nopWriteStat struct {
 func (ws *nopWriteStat) AddCount(_ MetricEvent, _ int64) {
 }
 
+// ConcurrencyStat provides read/update operation for concurrency statistics.
 type ConcurrencyStat interface {
 	CurrentConcurrency() int32
 	IncreaseConcurrency()
@@ -126,10 +128,13 @@ func CheckValidityForStatistic(sampleCount, intervalInMs uint32) error {
 	return nil
 }
 
-// CheckValidityForReuseStatistic check the compliance whether readonly metric statistic can be built based on resource's global statistic
-// The parameters, sampleCount and intervalInMs, are the parameters of the metric statistic you want to build
-// The parameters, parentSampleCount and parentIntervalInMs, are the parameters of the resource's global statistic
-// If compliance passes, return nil, if not returns specific error
+// CheckValidityForReuseStatistic checks whether the read-only stat-metric with given attributes
+// (i.e. sampleCount and intervalInMs) can be built based on underlying global statistics data-structure
+// with given attributes (parentSampleCount and parentIntervalInMs). Returns nil if the attributes
+// satisfy the validation, or return specific error if not.
+//
+// The parameters, sampleCount and intervalInMs, are the attributes of the stat-metric view you want to build.
+// The parameters, parentSampleCount and parentIntervalInMs, are the attributes of the underlying statistics data-structure.
 func CheckValidityForReuseStatistic(sampleCount, intervalInMs uint32, parentSampleCount, parentIntervalInMs uint32) error {
 	if intervalInMs == 0 || sampleCount == 0 || intervalInMs%sampleCount != 0 {
 		return IllegalStatisticParamsError
@@ -141,11 +146,11 @@ func CheckValidityForReuseStatistic(sampleCount, intervalInMs uint32, parentSamp
 	}
 	parentBucketLengthInMs := parentIntervalInMs / parentSampleCount
 
-	//SlidingWindowMetric's intervalInMs is not divisible by BucketLeapArray's intervalInMs
+	// intervalInMs of the SlidingWindowMetric is not divisible by BucketLeapArray's intervalInMs
 	if parentIntervalInMs%intervalInMs != 0 {
 		return GlobalStatisticNonReusableError
 	}
-	// BucketLeapArray's BucketLengthInMs is not divisible by SlidingWindowMetric's BucketLengthInMs
+	// BucketLeapArray's BucketLengthInMs is not divisible by BucketLengthInMs of SlidingWindowMetric
 	if bucketLengthInMs%parentBucketLengthInMs != 0 {
 		return GlobalStatisticNonReusableError
 	}
diff --git a/core/circuitbreaker/circuit_breaker.go b/core/circuitbreaker/circuit_breaker.go
index b7d2396..171482a 100644
--- a/core/circuitbreaker/circuit_breaker.go
+++ b/core/circuitbreaker/circuit_breaker.go
@@ -136,6 +136,10 @@ type circuitBreakerBase struct {
 	retryTimeoutMs uint32
 	// nextRetryTimestampMs is the time circuit breaker could probe
 	nextRetryTimestampMs uint64
+	// probeNumber is the number of probe requests that are allowed to pass when the circuit breaker is half open.
+	probeNumber uint64
+	// curProbeNumber is the real-time probe number.
+	curProbeNumber uint64
 	// state is the state machine of circuit breaker
 	state *State
 }
@@ -156,6 +160,14 @@ func (b *circuitBreakerBase) updateNextRetryTimestamp() {
 	atomic.StoreUint64(&b.nextRetryTimestampMs, util.CurrentTimeMillis()+uint64(b.retryTimeoutMs))
 }
 
+func (b *circuitBreakerBase) addCurProbeNum() {
+	atomic.AddUint64(&b.curProbeNumber, 1)
+}
+
+func (b *circuitBreakerBase) resetCurProbeNum() {
+	atomic.StoreUint64(&b.curProbeNumber, 0)
+}
+
 // fromClosedToOpen updates circuit breaker state machine from closed to open.
 // Return true only if current goroutine successfully accomplished the transformation.
 func (b *circuitBreakerBase) fromClosedToOpen(snapshot interface{}) bool {
@@ -206,6 +218,7 @@ func (b *circuitBreakerBase) fromOpenToHalfOpen(ctx *base.EntryContext) bool {
 // Return true only if current goroutine successfully accomplished the transformation.
 func (b *circuitBreakerBase) fromHalfOpenToOpen(snapshot interface{}) bool {
 	if b.state.cas(HalfOpen, Open) {
+		b.resetCurProbeNum()
 		b.updateNextRetryTimestamp()
 		for _, listener := range stateChangeListeners {
 			listener.OnTransformToOpen(HalfOpen, *b.rule, snapshot)
@@ -221,6 +234,7 @@ func (b *circuitBreakerBase) fromHalfOpenToOpen(snapshot interface{}) bool {
 // Return true only if current goroutine successfully accomplished the transformation.
 func (b *circuitBreakerBase) fromHalfOpenToClosed() bool {
 	if b.state.cas(HalfOpen, Closed) {
+		b.resetCurProbeNum()
 		for _, listener := range stateChangeListeners {
 			listener.OnTransformToClosed(HalfOpen, *b.rule)
 		}
@@ -247,6 +261,7 @@ func newSlowRtCircuitBreakerWithStat(r *Rule, stat *slowRequestLeapArray) *slowR
 			retryTimeoutMs:       r.RetryTimeoutMs,
 			nextRetryTimestampMs: 0,
 			state:                newState(),
+			probeNumber:          r.ProbeNum,
 		},
 		stat:                stat,
 		maxAllowedRt:        r.MaxAllowedRtMs,
@@ -282,6 +297,8 @@ func (b *slowRtCircuitBreaker) TryPass(ctx *base.EntryContext) bool {
 		if b.retryTimeoutArrived() && b.fromOpenToHalfOpen(ctx) {
 			return true
 		}
+	} else if curStatus == HalfOpen && b.probeNumber > 0 {
+		return true
 	}
 	return false
 }
@@ -318,9 +335,12 @@ func (b *slowRtCircuitBreaker) OnRequestComplete(rt uint64, _ error) {
 			// fail to probe
 			b.fromHalfOpenToOpen(1.0)
 		} else {
-			// succeed to probe
-			b.fromHalfOpenToClosed()
-			b.resetMetric()
+			b.addCurProbeNum()
+			if b.probeNumber == 0 || atomic.LoadUint64(&b.curProbeNumber) >= b.probeNumber {
+				// succeed to probe
+				b.fromHalfOpenToClosed()
+				b.resetMetric()
+			}
 		}
 		return
 	}
@@ -433,6 +453,7 @@ func newErrorRatioCircuitBreakerWithStat(r *Rule, stat *errorCounterLeapArray) *
 			retryTimeoutMs:       r.RetryTimeoutMs,
 			nextRetryTimestampMs: 0,
 			state:                newState(),
+			probeNumber:          r.ProbeNum,
 		},
 		minRequestAmount:    r.MinRequestAmount,
 		errorRatioThreshold: r.Threshold,
@@ -465,6 +486,8 @@ func (b *errorRatioCircuitBreaker) TryPass(ctx *base.EntryContext) bool {
 		if b.retryTimeoutArrived() && b.fromOpenToHalfOpen(ctx) {
 			return true
 		}
+	} else if curStatus == HalfOpen && b.probeNumber > 0 {
+		return true
 	}
 	return false
 }
@@ -498,8 +521,11 @@ func (b *errorRatioCircuitBreaker) OnRequestComplete(_ uint64, err error) {
 	}
 	if curStatus == HalfOpen {
 		if err == nil {
-			b.fromHalfOpenToClosed()
-			b.resetMetric()
+			b.addCurProbeNum()
+			if b.probeNumber == 0 || atomic.LoadUint64(&b.curProbeNumber) >= b.probeNumber {
+				b.fromHalfOpenToClosed()
+				b.resetMetric()
+			}
 		} else {
 			b.fromHalfOpenToOpen(1.0)
 		}
@@ -612,6 +638,7 @@ func newErrorCountCircuitBreakerWithStat(r *Rule, stat *errorCounterLeapArray) *
 			retryTimeoutMs:       r.RetryTimeoutMs,
 			nextRetryTimestampMs: 0,
 			state:                newState(),
+			probeNumber:          r.ProbeNum,
 		},
 		minRequestAmount:    r.MinRequestAmount,
 		errorCountThreshold: uint64(r.Threshold),
@@ -644,6 +671,8 @@ func (b *errorCountCircuitBreaker) TryPass(ctx *base.EntryContext) bool {
 		if b.retryTimeoutArrived() && b.fromOpenToHalfOpen(ctx) {
 			return true
 		}
+	} else if curStatus == HalfOpen && b.probeNumber > 0 {
+		return true
 	}
 	return false
 }
@@ -675,8 +704,11 @@ func (b *errorCountCircuitBreaker) OnRequestComplete(_ uint64, err error) {
 	}
 	if curStatus == HalfOpen {
 		if err == nil {
-			b.fromHalfOpenToClosed()
-			b.resetMetric()
+			b.addCurProbeNum()
+			if b.probeNumber == 0 || atomic.LoadUint64(&b.curProbeNumber) >= b.probeNumber {
+				b.fromHalfOpenToClosed()
+				b.resetMetric()
+			}
 		} else {
 			b.fromHalfOpenToOpen(1)
 		}
diff --git a/core/circuitbreaker/rule.go b/core/circuitbreaker/rule.go
index 4103011..0886604 100644
--- a/core/circuitbreaker/rule.go
+++ b/core/circuitbreaker/rule.go
@@ -78,6 +78,11 @@ type Rule struct {
 	// for ErrorRatio, it represents the max error request ratio
 	// for ErrorCount, it represents the max error request count
 	Threshold float64 `json:"threshold"`
+	//ProbeNum is number of probes required when the circuit breaker is half-open.
+	//when the probe num are set  and circuit breaker in the half-open state.
+	//if err occurs during the probe, the circuit breaker is opened immediately.
+	//otherwise,the circuit breaker is closed only after the number of probes is reached
+	ProbeNum uint64 `json:"probeNum"`
 }
 
 func (r *Rule) String() string {
diff --git a/core/config/entity.go b/core/config/entity.go
index 6243a6a..2bb389a 100644
--- a/core/config/entity.go
+++ b/core/config/entity.go
@@ -140,7 +140,7 @@ func NewDefaultConfig() *Entity {
 					CollectMemoryIntervalMs: DefaultMemoryStatCollectIntervalMs,
 				},
 			},
-			UseCacheTime: true,
+			UseCacheTime: false,
 		},
 	}
 }
diff --git a/core/flow/slot.go b/core/flow/slot.go
index 58a739f..13ad17b 100644
--- a/core/flow/slot.go
+++ b/core/flow/slot.go
@@ -17,6 +17,7 @@ package flow
 import (
 	"github.com/alibaba/sentinel-golang/core/base"
 	"github.com/alibaba/sentinel-golang/core/stat"
+	metric_exporter "github.com/alibaba/sentinel-golang/exporter/metric"
 	"github.com/alibaba/sentinel-golang/logging"
 	"github.com/alibaba/sentinel-golang/util"
 	"github.com/pkg/errors"
@@ -27,9 +28,17 @@ const (
 )
 
 var (
-	DefaultSlot = &Slot{}
+	DefaultSlot   = &Slot{}
+	flowWaitCount = metric_exporter.NewCounter(
+		"flow_wait_total",
+		"Flow wait count",
+		[]string{"resource"})
 )
 
+func init() {
+	metric_exporter.Register(flowWaitCount)
+}
+
 type Slot struct {
 }
 
@@ -58,6 +67,7 @@ func (s *Slot) Check(ctx *base.EntryContext) *base.TokenResult {
 		}
 		if r.Status() == base.ResultStatusShouldWait {
 			if nanosToWait := r.NanosToWait(); nanosToWait > 0 {
+				flowWaitCount.Add(float64(ctx.Input.BatchCount), ctx.Resource.Name())
 				// Handle waiting action.
 				util.Sleep(nanosToWait)
 			}
diff --git a/core/stat/base/bucket_leap_array.go b/core/stat/base/bucket_leap_array.go
index 62c2df1..33beaaa 100644
--- a/core/stat/base/bucket_leap_array.go
+++ b/core/stat/base/bucket_leap_array.go
@@ -24,7 +24,7 @@ import (
 	"github.com/pkg/errors"
 )
 
-// The implementation of sliding window based on LeapArray (as the sliding window infrastructure)
+// BucketLeapArray is the sliding window implementation based on LeapArray (as the sliding window infrastructure)
 // and MetricBucket (as the data type). The MetricBucket is used to record statistic
 // metrics per minimum time unit (i.e. the bucket time span).
 type BucketLeapArray struct {
@@ -42,11 +42,14 @@ func (bla *BucketLeapArray) ResetBucketTo(bw *BucketWrap, startTime uint64) *Buc
 	return bw
 }
 
-// sampleCount is the number of slots
-// intervalInMs is the time length of sliding window
-// sampleCount and intervalInMs must be positive and intervalInMs%sampleCount == 0,
-// the validation must be done before call NewBucketLeapArray
+// NewBucketLeapArray creates a BucketLeapArray with given attributes.
+//
+// The sampleCount represents the number of buckets, while intervalInMs represents
+// the total time span of sliding window. Note that the sampleCount and intervalInMs must be positive
+// and satisfies the condition that intervalInMs%sampleCount == 0.
+// The validation must be done before call NewBucketLeapArray.
 func NewBucketLeapArray(sampleCount uint32, intervalInMs uint32) *BucketLeapArray {
+	// TODO: also check params here.
 	bucketLengthInMs := intervalInMs / sampleCount
 	ret := &BucketLeapArray{
 		data: LeapArray{
@@ -82,9 +85,8 @@ func (bla *BucketLeapArray) GetIntervalInSecond() float64 {
 	return float64(bla.IntervalInMs()) / 1000.0
 }
 
-// Write method
-// It might panic
 func (bla *BucketLeapArray) AddCount(event base.MetricEvent, count int64) {
+	// It might panic?
 	bla.addCountWithTime(util.CurrentTimeMillis(), event, count)
 }
 
@@ -131,9 +133,9 @@ func (bla *BucketLeapArray) currentBucketWithTime(now uint64) *MetricBucket {
 	return b
 }
 
-// Read method, need to adapt upper application
-// it might panic
+// Count returns the sum count for the given MetricEvent within all valid (non-expired) buckets.
 func (bla *BucketLeapArray) Count(event base.MetricEvent) int64 {
+	// it might panic?
 	return bla.CountWithTime(util.CurrentTimeMillis(), event)
 }
 
@@ -159,12 +161,14 @@ func (bla *BucketLeapArray) CountWithTime(now uint64, event base.MetricEvent) in
 	return count
 }
 
-// Read method, get all BucketWrap.
+// Values returns all valid (non-expired) buckets.
 func (bla *BucketLeapArray) Values(now uint64) []*BucketWrap {
+	// Refresh current bucket if necessary.
 	_, err := bla.data.currentBucketOfTime(now, bla)
 	if err != nil {
-		logging.Error(err, "Failed to get current bucket in BucketLeapArray.Values()", "now", now)
+		logging.Error(err, "Failed to refresh current bucket in BucketLeapArray.Values()", "now", now)
 	}
+
 	return bla.data.valuesWithTime(now)
 }
 
diff --git a/core/stat/base/leap_array.go b/core/stat/base/leap_array.go
index e76036b..b6cbafd 100644
--- a/core/stat/base/leap_array.go
+++ b/core/stat/base/leap_array.go
@@ -26,15 +26,16 @@ import (
 	"github.com/pkg/errors"
 )
 
-// BucketWrap represent a slot to record metrics
-// In order to reduce the usage of memory, BucketWrap don't hold length of BucketWrap
+// BucketWrap represents a slot to record metrics.
+//
+// In order to reduce memory footprint, BucketWrap does not hold the length of the bucket.
 // The length of BucketWrap could be seen in LeapArray.
-// The scope of time is [startTime, startTime+bucketLength)
-// The size of BucketWrap is 24(8+16) bytes
+// The scope of time is [startTime, startTime+bucketLength).
+// The size of BucketWrap is 24(8+16) bytes.
 type BucketWrap struct {
-	// The start timestamp of this statistic bucket wrapper.
+	// BucketStart represents start timestamp of this statistic bucket wrapper.
 	BucketStart uint64
-	// The actual data structure to record the metrics (e.g. MetricBucket).
+	// Value represents the actual data structure of the metrics (e.g. MetricBucket).
 	Value atomic.Value
 }
 
@@ -50,8 +51,9 @@ func calculateStartTime(now uint64, bucketLengthInMs uint32) uint64 {
 	return now - (now % uint64(bucketLengthInMs))
 }
 
-// atomic BucketWrap array to resolve race condition
-// AtomicBucketWrapArray can not append or delete element after initializing
+// AtomicBucketWrapArray represents a thread-safe circular array.
+//
+// The length of the array should be provided on-create and cannot be modified.
 type AtomicBucketWrapArray struct {
 	// The base address for real data array
 	base unsafe.Pointer
@@ -94,11 +96,11 @@ func NewAtomicBucketWrapArrayWithTime(len int, bucketLengthInMs uint32, now uint
 	return ret
 }
 
-// New AtomicBucketWrapArray with initializing field data
-// Default, automatically initialize each BucketWrap
-// len: length of array
-// bucketLengthInMs: bucket length of BucketWrap
-// generator: generator to generate bucket
+// NewAtomicBucketWrapArray creates an AtomicBucketWrapArray and initializes data of each BucketWrap.
+//
+// The len represents the length of the circular array.
+// The bucketLengthInMs represents bucket length of each bucket (in milliseconds).
+// The generator accepts a BucketGenerator to generate and refresh buckets.
 func NewAtomicBucketWrapArray(len int, bucketLengthInMs uint32, generator BucketGenerator) *AtomicBucketWrapArray {
 	return NewAtomicBucketWrapArrayWithTime(len, bucketLengthInMs, util.CurrentTimeMillis(), generator)
 }
@@ -133,23 +135,30 @@ func (aa *AtomicBucketWrapArray) compareAndSet(idx int, except, update *BucketWr
 	return false
 }
 
-// The BucketWrap leap array,
-// sampleCount represent the number of BucketWrap
-// intervalInMs represent the interval of LeapArray.
-// For example, bucketLengthInMs is 200ms, intervalInMs is 1000ms, so sampleCount is 5.
-// Give a diagram to illustrate
-// Suppose current time is 888, bucketLengthInMs is 200ms, intervalInMs is 1000ms, LeapArray will build the below windows
+// LeapArray represents the fundamental implementation of a sliding window data-structure.
+//
+// Some important attributes: the sampleCount represents the number of buckets,
+// while intervalInMs represents the total time span of the sliding window.
+//
+// For example, assuming sampleCount=5, intervalInMs is 1000ms, so the bucketLength is 200ms.
+// Let's give a diagram to illustrate.
+// Suppose current timestamp is 1188, bucketLength is 200ms, intervalInMs is 1000ms, then
+// time span of current bucket is [1000, 1200). The representation of the underlying structure:
+//
 //   B0       B1      B2     B3      B4
 //   |_______|_______|_______|_______|_______|
-//  1000    1200    1400    1600    800    (1000)
-//                                        ^
-//                                      time=888
+//  1000    1200    400     600     800    (1000) ms
+//         ^
+//      time=1188
 type LeapArray struct {
 	bucketLengthInMs uint32
-	sampleCount      uint32
-	intervalInMs     uint32
-	array            *AtomicBucketWrapArray
-	// update lock
+	// sampleCount represents the number of BucketWrap.
+	sampleCount uint32
+	// intervalInMs represents the total time span of the sliding window (in milliseconds).
+	intervalInMs uint32
+	// array represents the internal circular array.
+	array *AtomicBucketWrapArray
+	// updateLock is the internal lock for update operations.
 	updateLock mutex
 }
 
@@ -224,7 +233,8 @@ func (la *LeapArray) calculateTimeIdx(now uint64) int {
 	return int(timeId) % la.array.length
 }
 
-//  Get all BucketWrap between [current time - leap array interval, current time]
+// Values returns all valid (non-expired) buckets between [curBucketEnd-windowInterval, curBucketEnd],
+// where curBucketEnd=curBucketStart+bucketLength.
 func (la *LeapArray) Values() []*BucketWrap {
 	return la.valuesWithTime(util.CurrentTimeMillis())
 }
@@ -244,6 +254,8 @@ func (la *LeapArray) valuesWithTime(now uint64) []*BucketWrap {
 	return ret
 }
 
+// ValuesConditional returns all buckets of which the startTimestamp satisfies the given timestamp condition (predicate).
+// The function uses the parameter "now" as the target timestamp.
 func (la *LeapArray) ValuesConditional(now uint64, predicate base.TimePredicate) []*BucketWrap {
 	if now <= 0 {
 		return make([]*BucketWrap, 0)
@@ -259,17 +271,17 @@ func (la *LeapArray) ValuesConditional(now uint64, predicate base.TimePredicate)
 	return ret
 }
 
-// Judge whether the BucketWrap is expired
+// isBucketDeprecated checks whether the BucketWrap is expired, according to given timestamp.
 func (la *LeapArray) isBucketDeprecated(now uint64, ww *BucketWrap) bool {
 	ws := atomic.LoadUint64(&ww.BucketStart)
 	return (now - ws) > uint64(la.intervalInMs)
 }
 
-// Generic interface to generate bucket
+// BucketGenerator represents the "generic" interface for generating and refreshing buckets.
 type BucketGenerator interface {
-	// called when timestamp entry a new slot interval
+	// NewEmptyBucket creates new raw data inside the bucket.
 	NewEmptyBucket() interface{}
 
-	// reset the BucketWrap, clear all data of BucketWrap
-	ResetBucketTo(bw *BucketWrap, startTime uint64) *BucketWrap
+	// ResetBucketTo refreshes the BucketWrap to provided startTime and resets all data inside the given bucket.
+	ResetBucketTo(bucket *BucketWrap, startTime uint64) *BucketWrap
 }
diff --git a/core/stat/base/sliding_window_metric.go b/core/stat/base/sliding_window_metric.go
index 937a865..19f9c68 100644
--- a/core/stat/base/sliding_window_metric.go
+++ b/core/stat/base/sliding_window_metric.go
@@ -25,9 +25,9 @@ import (
 )
 
 // SlidingWindowMetric represents the sliding window metric wrapper.
-// It does not store any data and is the wrapper of BucketLeapArray to adapt to different internal bucket
-// SlidingWindowMetric is used for SentinelRules and BucketLeapArray is used for monitor
-// BucketLeapArray is per resource, and SlidingWindowMetric support only read operation.
+// It does not store any data and is the wrapper of BucketLeapArray to adapt to different internal bucket.
+//
+// SlidingWindowMetric is designed as a high-level, read-only statistic structure for functionalities of Sentinel
 type SlidingWindowMetric struct {
 	bucketLengthInMs uint32
 	sampleCount      uint32
@@ -35,7 +35,8 @@ type SlidingWindowMetric struct {
 	real             *BucketLeapArray
 }
 
-// It must pass the parameter point to the real storage entity
+// NewSlidingWindowMetric creates a SlidingWindowMetric with given attributes.
+// The pointer to the internal statistic BucketLeapArray should be valid.
 func NewSlidingWindowMetric(sampleCount, intervalInMs uint32, real *BucketLeapArray) (*SlidingWindowMetric, error) {
 	if real == nil {
 		return nil, errors.New("nil BucketLeapArray")
@@ -53,7 +54,7 @@ func NewSlidingWindowMetric(sampleCount, intervalInMs uint32, real *BucketLeapAr
 	}, nil
 }
 
-// Get the start time range of the bucket for the provided time.
+// getBucketStartRange returns start time range of the bucket for the provided time.
 // The actual time span is: [start, end + in.bucketTimeLength)
 func (m *SlidingWindowMetric) getBucketStartRange(timeMs uint64) (start, end uint64) {
 	curBucketStartTime := calculateStartTime(timeMs, m.real.BucketLengthInMs())
@@ -107,6 +108,8 @@ func (m *SlidingWindowMetric) getQPSWithTime(now uint64, event base.MetricEvent)
 
 func (m *SlidingWindowMetric) getSatisfiedBuckets(now uint64) []*BucketWrap {
 	start, end := m.getBucketStartRange(now)
+	// Extracts the buckets of which the startTime is between [start, end]
+	// which means the time view of the buckets is [firstStart, endStart+bucketLength)
 	satisfiedBuckets := m.real.ValuesConditional(now, func(ws uint64) bool {
 		return ws >= start && ws <= end
 	})
diff --git a/exporter/metric/empty_exporter.go b/exporter/metric/empty_exporter.go
new file mode 100644
index 0000000..1d1602f
--- /dev/null
+++ b/exporter/metric/empty_exporter.go
@@ -0,0 +1,65 @@
+package metric
+
+import "net/http"
+
+type EmptyExporter struct {
+}
+
+func (e *EmptyExporter) HTTPHandler() http.Handler {
+	return nil
+}
+
+type emptyMetric struct {
+}
+
+func (e emptyMetric) Register() error {
+	return nil
+}
+
+func (e emptyMetric) Unregister() bool {
+	return false
+}
+
+func (e emptyMetric) Reset() {
+	return
+}
+
+func newEmptyExporter() *EmptyExporter {
+	return &EmptyExporter{}
+}
+
+type emptyCounter struct {
+	emptyMetric
+}
+
+func (e emptyCounter) Add(value float64, labelValues ...string) {
+	return
+}
+
+func (e *EmptyExporter) NewCounter(name, desc string, labelNames []string) Counter {
+	return emptyCounter{}
+}
+
+type emptyGauge struct {
+	emptyMetric
+}
+
+func (e emptyGauge) Set(value float64, labelValues ...string) {
+	return
+}
+
+func (e *EmptyExporter) NewGauge(name, desc string, labelNames []string) Gauge {
+	return &emptyGauge{}
+}
+
+type emptyHistogram struct {
+	emptyMetric
+}
+
+func (e emptyHistogram) Observe(value float64, labelValues ...string) {
+	return
+}
+
+func (e *EmptyExporter) NewHistogram(name, desc string, buckets []float64, labelNames []string) Histogram {
+	return &emptyHistogram{}
+}
diff --git a/exporter/metric/exporter.go b/exporter/metric/exporter.go
index 4983f67..801ee0c 100644
--- a/exporter/metric/exporter.go
+++ b/exporter/metric/exporter.go
@@ -33,7 +33,11 @@ var (
 )
 
 func init() {
-	exporter = newPrometheusExporter()
+	if config.MetricExportHTTPAddr() != "" {
+		exporter = newPrometheusExporter()
+	} else {
+		exporter = newEmptyExporter()
+	}
 
 	host, _ = os.Hostname()
 	if host == "" {
diff --git a/pkg/adapters/gin/go.mod b/pkg/adapters/gin/go.mod
index 1bc0a03..58ba39e 100644
--- a/pkg/adapters/gin/go.mod
+++ b/pkg/adapters/gin/go.mod
@@ -5,7 +5,7 @@ go 1.13
 require (
 	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
 	github.com/alibaba/sentinel-golang v1.0.2
-	github.com/gin-gonic/gin v1.6.3
+	github.com/gin-gonic/gin v1.7.0
 	github.com/go-ole/go-ole v1.2.5 // indirect
 	github.com/stretchr/testify v1.7.0
 )
diff --git a/pkg/adapters/gin/go.sum b/pkg/adapters/gin/go.sum
index 6246bb0..1e7f761 100644
--- a/pkg/adapters/gin/go.sum
+++ b/pkg/adapters/gin/go.sum
@@ -9,8 +9,8 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
-github.com/gin-gonic/gin v1.6.3 h1:ahKqKTFpO5KTPHxWZjEdPScmYaGtLo8Y4DMHoEsnp14=
-github.com/gin-gonic/gin v1.6.3/go.mod h1:75u5sXoLsGZoRN5Sgbi1eraJ4GU3++wFwWzhwvtwp4M=
+github.com/gin-gonic/gin v1.7.0 h1:jGB9xAJQ12AIGNB4HguylppmDK1Am9ppF7XnGXXJuoU=
+github.com/gin-gonic/gin v1.7.0/go.mod h1:jD2toBW3GZUr5UMcdrwQA10I7RuaFOl/SGeDjXkfUtY=
 github.com/go-ole/go-ole v1.2.5 h1:t4MGB5xEDZvXI+0rMjjsfBsD7yAgp/s9ZDkL1JndXwY=
 github.com/go-ole/go-ole v1.2.5/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/go-playground/assert/v2 v2.0.1 h1:MsBgLAaY856+nPRTKrp3/OZK38U/wa0CcBYNjji3q3A=
@@ -19,8 +19,8 @@ github.com/go-playground/locales v0.13.0 h1:HyWk6mgj5qFqCT5fjGBuRArbVDfE4hi8+e8c
 github.com/go-playground/locales v0.13.0/go.mod h1:taPMhCMXrRLJO55olJkUXHZBHCxTMfnGwq/HNwmWNS8=
 github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD876Lmtgy7VtROAbHHXk8no=
 github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
-github.com/go-playground/validator/v10 v10.2.0 h1:KgJ0snyC2R9VXYN2rneOtQcw5aHQB1Vv0sFl1UcHBOY=
-github.com/go-playground/validator/v10 v10.2.0/go.mod h1:uOYAAleCW8F/7oMFd6aG0GOhaH6EGOAJShg8Id5JGkI=
+github.com/go-playground/validator/v10 v10.4.1 h1:pH2c5ADXtd66mxoE0Zm9SUhxE20r7aM3F26W0hOn+GE=
+github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
 github.com/golang/protobuf v1.3.3 h1:gyjaxf+svBWX08ZjK86iN9geUJF0H6gp2IRKX6Nf6/I=
 github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
@@ -66,6 +66,8 @@ go.uber.org/multierr v1.5.0/go.mod h1:FeouvMocqHpRaaGuG9EjoKcStLC43Zu/fmqdUMPcKY
 go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 h1:psW17arqaxU48Z5kZ0CQnkZWQJsqcURM6tKiBApRjXI=
+golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
diff --git a/pkg/datasource/apollo/apollo.go b/pkg/datasource/apollo/apollo.go
new file mode 100644
index 0000000..5c2fadd
--- /dev/null
+++ b/pkg/datasource/apollo/apollo.go
@@ -0,0 +1,103 @@
+package apollo
+
+import (
+	"github.com/alibaba/sentinel-golang/ext/datasource"
+	"github.com/apolloconfig/agollo/v4"
+	"github.com/apolloconfig/agollo/v4/component/log"
+	"github.com/apolloconfig/agollo/v4/env/config"
+	"github.com/pkg/errors"
+)
+
+var (
+	ErrEmptyKey   = errors.New("property key is empty")
+	ErrMissConfig = errors.New("miss config")
+)
+
+type Option func(o *options)
+
+type options struct {
+	handlers []datasource.PropertyHandler
+	logger   log.LoggerInterface
+	client   *agollo.Client
+}
+
+// WithPropertyHandlers set property handlers
+func WithPropertyHandlers(handlers ...datasource.PropertyHandler) Option {
+	return func(o *options) {
+		o.handlers = handlers
+	}
+}
+
+// WithLogger set apollo logger
+func WithLogger(logger log.LoggerInterface) Option {
+	return func(o *options) {
+		o.logger = logger
+	}
+}
+
+// apolloDatasource implements datasource.Datasource
+type apolloDatasource struct {
+	datasource.Base
+	client      *agollo.Client
+	propertyKey string
+}
+
+// NewDatasource create apollo datasource
+func NewDatasource(conf *config.AppConfig, propertyKey string, opts ...Option) (datasource.DataSource, error) {
+	if conf == nil {
+		return nil, ErrMissConfig
+	}
+	if propertyKey == "" {
+		return nil, ErrEmptyKey
+	}
+	option := &options{
+		logger: &log.DefaultLogger{},
+	}
+	for _, opt := range opts {
+		opt(option)
+	}
+	agollo.SetLogger(option.logger)
+	apolloClient, err := agollo.StartWithConfig(func() (*config.AppConfig, error) {
+		return conf, nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	ds := &apolloDatasource{
+		client:      apolloClient,
+		propertyKey: propertyKey,
+	}
+	for _, handler := range option.handlers {
+		ds.AddPropertyHandler(handler)
+	}
+	return ds, nil
+}
+
+func (a *apolloDatasource) ReadSource() ([]byte, error) {
+	value := a.client.GetValue(a.propertyKey)
+	return []byte(value), nil
+}
+
+func (a *apolloDatasource) Initialize() error {
+	source, err := a.ReadSource()
+	if err != nil {
+		return err
+	}
+	a.handle(source)
+	listener := &customChangeListener{
+		ds: a,
+	}
+	a.client.AddChangeListener(listener)
+	return nil
+}
+
+func (a *apolloDatasource) Close() error {
+	return nil
+}
+
+func (a *apolloDatasource) handle(source []byte) {
+	err := a.Handle(source)
+	if err != nil {
+		log.Errorf("update config err: %s", err.Error())
+	}
+}
diff --git a/pkg/datasource/apollo/go.mod b/pkg/datasource/apollo/go.mod
new file mode 100644
index 0000000..7d209e8
--- /dev/null
+++ b/pkg/datasource/apollo/go.mod
@@ -0,0 +1,19 @@
+module github.com/alibaba/sentinel-golang/pkg/datasource/apollo
+
+go 1.13
+
+replace github.com/alibaba/sentinel-golang => ../../../
+
+require (
+	github.com/alibaba/sentinel-golang v1.0.3
+	github.com/apolloconfig/agollo/v4 v4.0.9
+	github.com/pkg/errors v0.9.1
+	github.com/stretchr/testify v1.7.0
+)
+
+require (
+	github.com/spf13/viper v1.9.0 // indirect
+	golang.org/x/sys v0.0.0-20211117180635-dee7805ff2e1 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	gopkg.in/ini.v1 v1.64.0 // indirect
+)
diff --git a/pkg/datasource/apollo/go.sum b/pkg/datasource/apollo/go.sum
new file mode 100644
index 0000000..f30466f
--- /dev/null
+++ b/pkg/datasource/apollo/go.sum
@@ -0,0 +1,943 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
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+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/pkg/datasource/apollo/listener.go b/pkg/datasource/apollo/listener.go
new file mode 100644
index 0000000..c12c8e6
--- /dev/null
+++ b/pkg/datasource/apollo/listener.go
@@ -0,0 +1,25 @@
+package apollo
+
+import (
+	"github.com/apolloconfig/agollo/v4/storage"
+)
+
+type customChangeListener struct {
+	ds *apolloDatasource
+}
+
+func (c *customChangeListener) OnChange(event *storage.ChangeEvent) {
+	for key, value := range event.Changes {
+		if c.ds.propertyKey == key {
+			c.ds.handle([]byte(value.NewValue.(string)))
+		}
+	}
+}
+
+func (c *customChangeListener) OnNewestChange(event *storage.FullChangeEvent) {
+	for key, value := range event.Changes {
+		if c.ds.propertyKey == key {
+			c.ds.handle([]byte(value.(string)))
+		}
+	}
+}


Test patch:
diff --git a/core/circuitbreaker/circuit_breaker_test.go b/core/circuitbreaker/circuit_breaker_test.go
index cacd7e0..6f84505 100644
--- a/core/circuitbreaker/circuit_breaker_test.go
+++ b/core/circuitbreaker/circuit_breaker_test.go
@@ -61,18 +61,15 @@ type StateChangeListenerMock struct {
 }
 
 func (s *StateChangeListenerMock) OnTransformToClosed(prev State, rule Rule) {
-	_ = s.Called(prev, rule)
 	logging.Debug("transform to closed", "strategy", rule.Strategy, "prevState", prev.String())
 	return
 }
 
 func (s *StateChangeListenerMock) OnTransformToOpen(prev State, rule Rule, snapshot interface{}) {
-	_ = s.Called(prev, rule, snapshot)
 	logging.Debug("transform to open", "strategy", rule.Strategy, "prevState", prev.String(), "snapshot", snapshot)
 }
 
 func (s *StateChangeListenerMock) OnTransformToHalfOpen(prev State, rule Rule) {
-	_ = s.Called(prev, rule)
 	logging.Debug("transform to Half-Open", "strategy", rule.Strategy, "prevState", prev.String())
 }
 
@@ -140,6 +137,35 @@ func TestSlowRtCircuitBreaker_TryPass(t *testing.T) {
 		assert.True(t, pass)
 		assert.True(t, b.state.get() == HalfOpen)
 	})
+
+	t.Run("TryPass_ProbeNum", func(t *testing.T) {
+		r := &Rule{
+			Resource:         "abc",
+			Strategy:         SlowRequestRatio,
+			RetryTimeoutMs:   3000,
+			MinRequestAmount: 10,
+			StatIntervalMs:   10000,
+			MaxAllowedRtMs:   50,
+			Threshold:        0.5,
+			ProbeNum:         10,
+		}
+		b, err := newSlowRtCircuitBreaker(r)
+		assert.Nil(t, err)
+
+		b.state.set(Open)
+		ctx := &base.EntryContext{
+			Resource: base.NewResourceWrapper("abc", base.ResTypeCommon, base.Inbound),
+		}
+		e := base.NewSentinelEntry(ctx, base.NewResourceWrapper("abc", base.ResTypeCommon, base.Inbound), nil)
+		ctx.SetEntry(e)
+		for i := 0; i < 10; i++ {
+			pass := b.TryPass(ctx)
+			assert.True(t, pass)
+			assert.True(t, b.state.get() == HalfOpen)
+			b.OnRequestComplete(1, nil)
+		}
+		assert.True(t, b.state.get() == Closed)
+	})
 }
 
 func TestSlowRt_OnRequestComplete(t *testing.T) {
@@ -169,6 +195,20 @@ func TestSlowRt_OnRequestComplete(t *testing.T) {
 		b.OnRequestComplete(10, nil)
 		assert.True(t, b.CurrentState() == Closed)
 	})
+	t.Run("OnRequestComplete_ProbeNum_Success", func(t *testing.T) {
+		b.probeNumber = 2
+		b.state.set(HalfOpen)
+		b.OnRequestComplete(10, nil)
+		assert.True(t, b.CurrentState() == HalfOpen)
+		assert.True(t, b.curProbeNumber == 1)
+	})
+	t.Run("OnRequestComplete_ProbeNum_Failed", func(t *testing.T) {
+		b.probeNumber = 2
+		b.state.set(HalfOpen)
+		b.OnRequestComplete(base.NewEmptyEntryContext().Rt(), nil)
+		assert.True(t, b.CurrentState() == Open)
+		assert.True(t, b.curProbeNumber == 0)
+	})
 }
 
 func TestSlowRt_ResetBucketTo(t *testing.T) {
@@ -227,6 +267,33 @@ func TestErrorRatioCircuitBreaker_TryPass(t *testing.T) {
 		assert.True(t, pass)
 		assert.True(t, b.state.get() == HalfOpen)
 	})
+	t.Run("TryPass_ProbeNum", func(t *testing.T) {
+		r := &Rule{
+			Resource:         "abc",
+			Strategy:         ErrorRatio,
+			RetryTimeoutMs:   3000,
+			MinRequestAmount: 10,
+			StatIntervalMs:   10000,
+			Threshold:        0.5,
+			ProbeNum:         10,
+		}
+		b, err := newErrorRatioCircuitBreaker(r)
+		assert.Nil(t, err)
+
+		b.state.set(Open)
+		ctx := &base.EntryContext{
+			Resource: base.NewResourceWrapper("abc", base.ResTypeCommon, base.Inbound),
+		}
+		e := base.NewSentinelEntry(ctx, base.NewResourceWrapper("abc", base.ResTypeCommon, base.Inbound), nil)
+		ctx.SetEntry(e)
+		for i := 0; i < 10; i++ {
+			pass := b.TryPass(ctx)
+			assert.True(t, pass)
+			assert.True(t, b.state.get() == HalfOpen)
+			b.OnRequestComplete(1, nil)
+		}
+		assert.True(t, b.state.get() == Closed)
+	})
 }
 
 func TestErrorRatio_OnRequestComplete(t *testing.T) {
@@ -254,6 +321,20 @@ func TestErrorRatio_OnRequestComplete(t *testing.T) {
 		b.OnRequestComplete(0, errors.New("errorRatio"))
 		assert.True(t, b.CurrentState() == Open)
 	})
+	t.Run("OnRequestComplete_ProbeNum_Success", func(t *testing.T) {
+		b.probeNumber = 2
+		b.state.set(HalfOpen)
+		b.OnRequestComplete(base.NewEmptyEntryContext().Rt(), nil)
+		assert.True(t, b.CurrentState() == HalfOpen)
+		assert.True(t, b.curProbeNumber == 1)
+	})
+	t.Run("OnRequestComplete_ProbeNum_Failed", func(t *testing.T) {
+		b.probeNumber = 2
+		b.state.set(HalfOpen)
+		b.OnRequestComplete(0, errors.New("errorRatio"))
+		assert.True(t, b.CurrentState() == Open)
+		assert.True(t, b.curProbeNumber == 0)
+	})
 }
 
 func TestErrorRatio_ResetBucketTo(t *testing.T) {
@@ -312,6 +393,34 @@ func TestErrorCountCircuitBreaker_TryPass(t *testing.T) {
 		assert.True(t, pass)
 		assert.True(t, b.state.get() == HalfOpen)
 	})
+
+	t.Run("TryPass_ProbeNum", func(t *testing.T) {
+		r := &Rule{
+			Resource:         "abc",
+			Strategy:         ErrorCount,
+			RetryTimeoutMs:   3000,
+			MinRequestAmount: 10,
+			StatIntervalMs:   10000,
+			Threshold:        1.0,
+			ProbeNum:         10,
+		}
+		b, err := newErrorCountCircuitBreaker(r)
+		assert.Nil(t, err)
+
+		b.state.set(Open)
+		ctx := &base.EntryContext{
+			Resource: base.NewResourceWrapper("abc", base.ResTypeCommon, base.Inbound),
+		}
+		e := base.NewSentinelEntry(ctx, base.NewResourceWrapper("abc", base.ResTypeCommon, base.Inbound), nil)
+		ctx.SetEntry(e)
+		for i := 0; i < 10; i++ {
+			pass := b.TryPass(ctx)
+			assert.True(t, pass)
+			assert.True(t, b.state.get() == HalfOpen)
+			b.OnRequestComplete(1, nil)
+		}
+		assert.True(t, b.state.get() == Closed)
+	})
 }
 
 func TestErrorCount_OnRequestComplete(t *testing.T) {
@@ -339,6 +448,20 @@ func TestErrorCount_OnRequestComplete(t *testing.T) {
 		b.OnRequestComplete(0, errors.New("errorCount"))
 		assert.True(t, b.CurrentState() == Open)
 	})
+	t.Run("OnRequestComplete_ProbeNum_Success", func(t *testing.T) {
+		b.probeNumber = 2
+		b.state.set(HalfOpen)
+		b.OnRequestComplete(base.NewEmptyEntryContext().Rt(), nil)
+		assert.True(t, b.CurrentState() == HalfOpen)
+		assert.True(t, b.curProbeNumber == 1)
+	})
+	t.Run("OnRequestComplete_ProbeNum_Failed", func(t *testing.T) {
+		b.probeNumber = 2
+		b.state.set(HalfOpen)
+		b.OnRequestComplete(0, errors.New("errorCount"))
+		assert.True(t, b.CurrentState() == Open)
+		assert.True(t, b.curProbeNumber == 0)
+	})
 }
 
 func TestFromClosedToOpen(t *testing.T) {
diff --git a/pkg/datasource/apollo/apollo_test.go b/pkg/datasource/apollo/apollo_test.go
new file mode 100644
index 0000000..46d8881
--- /dev/null
+++ b/pkg/datasource/apollo/apollo_test.go
@@ -0,0 +1,63 @@
+package apollo
+
+import (
+	"testing"
+
+	"github.com/apolloconfig/agollo/v4/env/config"
+	"github.com/stretchr/testify/assert"
+)
+
+// must run an apollo server before test
+// this would be failed for CICD test. so it's disabled for now
+//func TestConfig(t *testing.T) {
+//
+//	var resultConfig string
+//
+//	propertyHandler := datasource2.NewDefaultPropertyHandler(
+//		func(src []byte) (interface{}, error) {
+//			return string(src), nil
+//		},
+//		func(data interface{}) error {
+//			s := data.(string)
+//			fmt.Println(s)
+//			resultConfig = s
+//			return nil
+//		},
+//	)
+//	c := &config.AppConfig{
+//		AppID:          "SampleApp",
+//		Cluster:        "DEV",
+//		IP:             "http://localhost:8080",
+//		NamespaceName:  "application",
+//		IsBackupConfig: true,
+//		Secret:         "1dc9532d02cd47f0bb26ee39d614ef8d",
+//	}
+//	datasource, err := NewDatasource(
+//		c, "timeout",
+//		WithLogger(&log.DefaultLogger{}),
+//		WithPropertyHandlers(propertyHandler),
+//	)
+//	assert.Nil(t, err)
+//	err = datasource.Initialize()
+//	assert.Nil(t, err)
+//	assert.Equal(t, "123", resultConfig)
+//	select {}
+//}
+
+func TestEmptyKey(t *testing.T) {
+	c := &config.AppConfig{
+		AppID:          "SampleApp",
+		Cluster:        "DEV",
+		IP:             "http://localhost:8080",
+		NamespaceName:  "application",
+		IsBackupConfig: true,
+		Secret:         "1dc9532d02cd47f0bb26ee39d614ef8d",
+	}
+	_, err := NewDatasource(c, "")
+	assert.Equal(t, ErrEmptyKey, err)
+}
+
+func TestMissConfig(t *testing.T) {
+	_, err := NewDatasource(nil, "test")
+	assert.Equal(t, ErrMissConfig, err)
+}