update the advanced circuit_breaker

resiliency/06_circuit_breaker/breaker_options.go

@@ -3,7 +3,7 @@ package circuit
 import "time"
 
 //BreakConditionWatcher check state
-type BreakConditionWatcher func(counts counters) bool
+type BreakConditionWatcher func(cnter counters) bool
 
 //StateChangedEventHandler set event handle
 type StateChangedEventHandler func(name string, from State, to State)
@@ -60,8 +60,8 @@ func Expiry(expiry time.Time) Option {
 	}
 }
 
-//OnStateChanged set handle of ChangedHandle
-func OnStateChanged(handler StateChangedEventHandler) Option {
+//WithStateChanged set handle of ChangedHandle
+func WithStateChanged(handler StateChangedEventHandler) Option {
 	return func(opts *Options) {
 		opts.OnStateChanged = handler
 	}

resiliency/06_circuit_breaker/circuit_breaker.go

@@ -3,7 +3,7 @@
  * @Author: Edward
  * @Date: 2020-05-10 22:00:58
  * @Last Modified by: Edward
- * @Last Modified time: 2020-05-22 16:44:57
+ * @Last Modified time: 2020-05-22 17:25:56
  */
 
 package circuit
@@ -36,15 +36,16 @@ const (
 ////////////////////////////////
 //way 2 对象式断路器
 // 高级模式
+// 支持多工作者模式
 ////////////////////////////////
 
 //RequestBreaker for protection
 type RequestBreaker struct {
 	options    Options
 	mutex      sync.Mutex
-	state      OperationState //断路器的当前状态
+	state      State
 	generation uint64
-	counts     ICounter
+	cnter      ICounter
 }
 
 //NewRequestBreaker return a breaker
@@ -56,7 +57,7 @@ func NewRequestBreaker(opts ...Option) *RequestBreaker {
 		Interval:       time.Second * 2,  // interval to check status
 		Timeout:        time.Second * 60, //default to 60 seconds
 		MaxRequests:    5,
-		WhenToBreak:    func(counts counters) bool { return counts.ConsecutiveFailures > 2 },
+		WhenToBreak:    func(cnter counters) bool { return cnter.ConsecutiveFailures > 2 },
 		OnStateChanged: func(name string, fromPre State, toCurrent State) {},
 	}
 
@@ -67,7 +68,7 @@ func NewRequestBreaker(opts ...Option) *RequestBreaker {
 
 	return &RequestBreaker{
 		options:    defaultOptions,
-		counts:     &counters{},
+		cnter:      &counters{},
 		generation: 0,
 	}
 }
@@ -79,14 +80,18 @@ func NewRequestBreaker(opts ...Option) *RequestBreaker {
 func (rb *RequestBreaker) Do(work func() (interface{}, error)) (interface{}, error) {
 
 	//before
-	fmt.Println("before do : request:", rb.counts.Total())
+	fmt.Println("before do : request:", rb.cnter.Total())
 
 	//handle status
 
+	if rb.state == StateOpen && rb.options.Expiry.Before(time.Now()) {
+
+	}
+
 	//do work from requested user
 	result, err := work()
 
-	fmt.Println("after do : request:", rb.counts.Total())
+	fmt.Println("after do : request:", rb.cnter.Total())
 
 	return result, err
 }

resiliency/06_circuit_breaker/circuit_breaker_test.go

@@ -3,7 +3,7 @@
  * @Author: Edward
  * @Date: 2020-05-11 10:55:28
  * @Last Modified by: Edward
- * @Last Modified time: 2020-05-22 16:37:21
+ * @Last Modified time: 2020-05-22 17:21:06
  */
 
 package circuit
@@ -19,6 +19,16 @@ import (
 
 var breaker *RequestBreaker
 
+var onStateChangeEvent = func(name string, from, to State) {
+	fmt.Println("name:", name, "from:", from, "to", to)
+}
+
+var whenConditionOccurred = func(cnter counters) bool {
+	//失败率，可以由用户自己定义
+	failureRatio := float64(cnter.TotalFailures) / float64(cnter.Requests)
+	return cnter.Requests >= 3 && failureRatio >= 0.6
+}
+
 func TestObjectBreaker(t *testing.T) {
 
 	jobToDo := func() (interface{}, error) {
@@ -34,13 +44,7 @@ func TestObjectBreaker(t *testing.T) {
 		return body, nil
 	}
 
-	whenCondition := func(counts counters) bool {
-		//失败率，可以由用户自己定义
-		failureRatio := float64(counts.TotalFailures) / float64(counts.Requests)
-		return counts.Requests >= 3 && failureRatio >= 0.6
-	}
-
-	breaker = NewRequestBreaker(Name("HTTP GET"), BreakIf(whenCondition))
+	breaker = NewRequestBreaker(Name("HTTP GET"), BreakIf(whenConditionOccurred), WithStateChanged(onStateChangeEvent))
 
 	body, err := breaker.Do(jobToDo)
 	if err != nil {

resiliency/06_circuit_breaker/circuit_counter.go

@@ -3,7 +3,7 @@
  * @Author: Edward
  * @Date: 2020-05-22 12:41:54
  * @Last Modified by: Edward
- * @Last Modified time: 2020-05-22 16:47:37
+ * @Last Modified time: 2020-05-22 17:22:35
  */
 
 package circuit
@@ -40,7 +40,6 @@ type ICounter interface {
 
 type counters struct {
 	Requests             uint32 //连续的请求次数
-	lastState            OperationState
 	lastActivity         time.Time
 	TotalFailures        uint32
 	TotalSuccesses       uint32
@@ -59,7 +58,6 @@ func (c *counters) LastActivity() time.Time {
 func (c *counters) Reset() {
 	ct := &counters{}
 	ct.lastActivity = c.lastActivity
-	ct.lastState = c.lastState
 	c = ct
 }
 
@@ -74,7 +72,7 @@ func (c *counters) Count(statue OperationState) {
 	}
 	c.Requests++
 	c.lastActivity = time.Now() //更新活动时间
-	c.lastState = statue
+	//	c.lastOpResult = statue
 	//handle status change
 
 }

resiliency/06_circuit_breaker/circuit_func_closure.go

@@ -3,7 +3,7 @@
  * @Author: Edward
  * @Date: 2020-05-22 12:42:34
  * @Last Modified by: Edward
- * @Last Modified time: 2020-05-22 16:48:56
+ * @Last Modified time: 2020-05-22 17:21:40
  */
 
 package circuit
@@ -31,7 +31,7 @@ const (
 )
 
 type simpleCounter struct {
-	lastState            OperationState
+	lastOpResult         OperationState
 	lastActivity         time.Time
 	ConsecutiveSuccesses uint32
 	ConsecutiveFailures  uint32
@@ -44,21 +44,21 @@ func (c *simpleCounter) LastActivity() time.Time {
 func (c *simpleCounter) Reset() {
 	ct := &simpleCounter{}
 	ct.lastActivity = c.lastActivity
-	ct.lastState = UnknownState
+	ct.lastOpResult = UnknownState
 	c = ct
 }
 
 //Count the failure and success
-func (c *simpleCounter) Count(statue OperationState) {
+func (c *simpleCounter) Count(lastState OperationState) {
 
-	switch statue {
+	switch lastState {
 	case FailureState:
 		c.ConsecutiveFailures++
 	case SuccessState:
 		c.ConsecutiveSuccesses++
 	}
 	c.lastActivity = time.Now() //更新活动时间
-	c.lastState = statue
+	c.lastOpResult = lastState
 	//handle status change
 }