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How to use hardStop method of executor Package

Best K6 code snippet using executor.hardStop

vu_handle.go

Source:vu_handle.go

...39short names for input:40- start is the method start41- loop is a loop of runLoopsIfPossible42- grace is the method gracefulStop43- hard is the method hardStop44+-------+-------------------------------------+---------------------------------------------------+45| input | current         | next state        | notes                                             |46+-------+-------------------------------------+---------------------------------------------------+47| start | stopped         | starting          | normal                                            |48| start | starting        | starting          | nothing                                           |49| start | running         | running           | nothing                                           |50| start | toGracefulStop  | running           | we raced with the loop stopping, just continue    |51| start | toHardStop      | starting          | same as stopped really                            |52| loop  | stopped         | stopped           | we actually are blocked on canStartIter           |53| loop  | starting        | running           | get new VU and context                            |54| loop  | running         | running           | usually fast path                                 |55| loop  | toGracefulStop  | stopped           | cancel the context and make new one               |56| loop  | toHardStop      | stopped           | cancel the context and make new one               |57| grace | stopped         | stopped           | nothing                                           |58| grace | starting        | stopped           | cancel the context to return the VU               |59| grace | running         | toGracefulStop    | normal one, the actual work is in the loop        |60| grace | toGracefulStop  | toGracefulStop    | nothing                                           |61| grace | toHardSTop      | toHardStop        | nothing                                           |62| hard  | stopped         | stopped           | nothing                                           |63| hard  | starting        | stopped           | short circuit as in the grace case, not necessary |64| hard  | running         | toHardStop        | normal, cancel context and reinitialize it        |65| hard  | toGracefulStop  | toHardStop        | normal, cancel context and reinitialize it        |66| hard  | toHardStop      | toHardStop        | nothing                                           |67+-------+-----------------+-------------------+----------------------------------------------------+68*/69// This is a helper type used in executors where we have to dynamically control70// the number of VUs that are simultaneously running. For the moment, it is used71// in the RampingVUs and the ExternallyControlled executors.72// Notes on the implementation requirements:73// - it needs to be able to start and stop VUs in thread safe fashion74// - for each call to getVU there must be 1 (and only 1) call to returnVU75// - gracefulStop must let an iteration which has started to finish. For reasons of ease of76// implementation and lack of good evidence it's not required to let a not started iteration to77// finish in other words if you call start and then gracefulStop, there is no requirement for78// 1 iteration to have been started.79// - hardStop must stop an iteration in process80// - it's not required but preferable, if where possible to not reactivate VUs and to reuse context81// as this speed ups the execution82type vuHandle struct {83	mutex                 *sync.Mutex84	parentCtx             context.Context85	getVU                 func() (lib.InitializedVU, error)86	returnVU              func(lib.InitializedVU)87	nextIterationCounters func() (uint64, uint64)88	config                *BaseConfig89	initVU       lib.InitializedVU90	activeVU     lib.ActiveVU91	canStartIter chan struct{}92	state stateType // see the table above for meanings93	// stateH []int32 // helper for debugging94	ctx    context.Context95	cancel func()96	logger *logrus.Entry97}98func newStoppedVUHandle(99	parentCtx context.Context, getVU func() (lib.InitializedVU, error),100	returnVU func(lib.InitializedVU),101	nextIterationCounters func() (uint64, uint64),102	config *BaseConfig, logger *logrus.Entry,103) *vuHandle {104	ctx, cancel := context.WithCancel(parentCtx)105	return &vuHandle{106		mutex:                 &sync.Mutex{},107		parentCtx:             parentCtx,108		getVU:                 getVU,109		nextIterationCounters: nextIterationCounters,110		config:                config,111		canStartIter: make(chan struct{}),112		state:        stopped,113		ctx:      ctx,114		cancel:   cancel,115		logger:   logger,116		returnVU: returnVU,117	}118}119func (vh *vuHandle) start() (err error) {120	vh.mutex.Lock()121	defer vh.mutex.Unlock()122	switch vh.state {123	case starting, running:124		return nil // nothing to do125	case toGracefulStop: // we raced with the loop, lets not return the vu just to get it back126		vh.logger.Debug("Start")127		close(vh.canStartIter)128		vh.changeState(running)129	case stopped, toHardStop: // we need to reactivate the VU and remake the context for it130		vh.logger.Debug("Start")131		vh.initVU, err = vh.getVU()132		if err != nil {133			return err134		}135		vh.activeVU = vh.initVU.Activate(getVUActivationParams(136			vh.ctx, *vh.config, vh.returnVU, vh.nextIterationCounters))137		close(vh.canStartIter)138		vh.changeState(starting)139	}140	return nil141}142// just a helper function for debugging143func (vh *vuHandle) changeState(newState stateType) {144	// vh.stateH = append(vh.stateH, newState)145	atomic.StoreInt32((*int32)(&vh.state), int32(newState))146}147func (vh *vuHandle) gracefulStop() {148	vh.mutex.Lock()149	defer vh.mutex.Unlock()150	switch vh.state {151	case toGracefulStop, toHardStop, stopped:152		return // nothing to do153	case starting: // we raced with the loop and apparently it won't do a single iteration154		vh.cancel()155		vh.ctx, vh.cancel = context.WithCancel(vh.parentCtx)156		vh.changeState(stopped)157	case running:158		vh.changeState(toGracefulStop)159	}160	vh.logger.Debug("Graceful stop")161	vh.canStartIter = make(chan struct{})162}163func (vh *vuHandle) hardStop() {164	vh.mutex.Lock()165	defer vh.mutex.Unlock()166	switch vh.state {167	case toHardStop, stopped:168		return // nothing to do169	case starting: // we raced with the loop and apparently it won't do a single iteration170		vh.changeState(stopped)171	case running, toGracefulStop:172		vh.changeState(toHardStop)173	}174	vh.logger.Debug("Hard stop")175	vh.cancel()176	vh.ctx, vh.cancel = context.WithCancel(vh.parentCtx)177	vh.canStartIter = make(chan struct{})178}179// runLoopsIfPossible is where all the fun is :D. Unfortunately somewhere we need to check most180// of the cases and this is where this happens.181func (vh *vuHandle) runLoopsIfPossible(runIter func(context.Context, lib.ActiveVU) bool) {182	// We can probably initialize here, but it's also easier to just use the slow path in the second183	// part of the for loop184	defer func() {185		// not sure if this is needed, because here the parentCtx is canceled and I would argue it doesn't matter186		// if we set the correct state187		vh.mutex.Lock()188		vh.changeState(stopped)189		vh.mutex.Unlock()190	}()191	var (192		executorDone = vh.parentCtx.Done()193		ctx          context.Context194		cancel       func()195		vu           lib.ActiveVU196	)197	for {198		state := stateType(atomic.LoadInt32((*int32)(&vh.state)))199		if state == running && runIter(ctx, vu) { // fast path200			continue201		}202		// slow path - something has changed - get what and wait until we can do more iterations203		vh.mutex.Lock()204		select {205		case <-executorDone:206			// The whole executor is done, nothing more to do.207			vh.mutex.Unlock()208			return209		default:210		}211		switch vh.state {212		case running: // start raced us toGracefulStop213			vh.mutex.Unlock()214			continue215		case toGracefulStop:216			if cancel != nil {217				// we need to cancel the context, to return the vu218				// and because *we* did, lets reinitialize it219				cancel()220				vh.ctx, vh.cancel = context.WithCancel(vh.parentCtx)221			}222			fallthrough // to set the state223		case toHardStop:224			// we have *now* stopped225			vh.changeState(stopped)226		case stopped, starting:227			// there is nothing to do228		}229		canStartIter := vh.canStartIter230		ctx = vh.ctx231		vh.mutex.Unlock()232		// We're are stopped, but the executor isn't done yet, so we wait233		// for either one of those conditions.234		select {235		case <-canStartIter: // we can start again236			vh.mutex.Lock()237			select {238			case <-vh.canStartIter: // we check again in case of race239				// reinitialize240				vu, ctx, cancel = vh.activeVU, vh.ctx, vh.cancel241				vh.changeState(running)242			default:243				// well we got raced to here by something ... loop again ...244			}245			vh.mutex.Unlock()246		case <-ctx.Done():247			// hardStop was called, start a fresh iteration to get the new248			// context and signal channel249		case <-executorDone:250			// The whole executor is done, nothing more to do.251			return252		}253	}254}...

hardStop

Using AI Code Generation

1import (2func main() {3	runtime.ReadMemStats(&m)4	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))5}6func bToMb(b uint64) uint64 {7}8import (9func main() {10	runtime.ReadMemStats(&m)11	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))12}13func bToMb(b uint64) uint64 {14}15import (16func main() {17	runtime.ReadMemStats(&m)18	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))19}20func bToMb(b uint64) uint64 {21}22import (23func main() {24	runtime.ReadMemStats(&m)25	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))26}27func bToMb(b uint64) uint64 {28}29import (30func main() {31	runtime.ReadMemStats(&m)32	fmt.Printf("Alloc = %v MiB", bToMb(m.Alloc))33}34func bToMb(b uint64) uint64 {35}36import (37func main() {38	runtime.ReadMemStats(&m)39	fmt.Printf("Alloc = %v MiB", b

hardStop

Using AI Code Generation

1func main() {2    executor := NewExecutor()3    executor.Start()4    executor.hardStop()5}6func main() {7    executor := NewExecutor()8    executor.Start()9    executor.hardStop()10}11func main() {12    executor := NewExecutor()13    executor.Start()14    executor.hardStop()15}16func main() {17    executor := NewExecutor()18    executor.Start()19    executor.hardStop()20}21func main() {22    executor := NewExecutor()23    executor.Start()24    executor.hardStop()25}26func main() {27    executor := NewExecutor()28    executor.Start()29    executor.hardStop()30}31func main() {32    executor := NewExecutor()33    executor.Start()34    executor.hardStop()35}36func main() {37    executor := NewExecutor()38    executor.Start()39    executor.hardStop()40}41func main() {42    executor := NewExecutor()43    executor.Start()44    executor.hardStop()45}46func main() {47    executor := NewExecutor()48    executor.Start()49    executor.hardStop()50}51func main() {52    executor := NewExecutor()53    executor.Start()54    executor.hardStop()55}56func main() {57    executor := NewExecutor()58    executor.Start()59    executor.hardStop()60}61func main() {62    executor := NewExecutor()63    executor.Start()64    executor.hardStop()65}

hardStop

Using AI Code Generation

1import (2func main() {3    cmd := exec.Command("sleep", "100")4    err := cmd.Start()5    if err != nil {6        fmt.Println(err)7        os.Exit(1)8    }9    fmt.Printf("Waiting for command to finish...")10    time.Sleep(1 * time.Second)11    err = cmd.Process.Signal(syscall.SIGKILL)12    if err != nil {13        fmt.Println(err)14        os.Exit(1)15    }16    err = cmd.Wait()17    fmt.Printf("Command finished with error: %v", err)18}

hardStop

Using AI Code Generation

1func main() {2    e := NewExecutor()3    e.Start()4    e.HardStop()5}6func main() {7    e := NewExecutor()8    e.Start()9    e.HardStop()10}11func main() {12    e := NewExecutor()13    e.Start()14    e.HardStop()15}16func main() {17    e := NewExecutor()18    e.Start()19    e.HardStop()20}21func main() {22    e := NewExecutor()23    e.Start()24    e.HardStop()25}26func main() {27    e := NewExecutor()28    e.Start()29    e.HardStop()30}31func main() {32    e := NewExecutor()33    e.Start()34    e.HardStop()35}36func main() {37    e := NewExecutor()38    e.Start()39    e.HardStop()40}41func main() {42    e := NewExecutor()43    e.Start()44    e.HardStop()45}46func main() {47    e := NewExecutor()48    e.Start()49    e.HardStop()50}51func main() {52    e := NewExecutor()53    e.Start()54    e.HardStop()55}56func main() {57    e := NewExecutor()58    e.Start()59    e.HardStop()60}61func main() {62    e := NewExecutor()63    e.Start()64    e.HardStop()65}

hardStop

Using AI Code Generation

1import (2func main() {3	executor := NewExecutor(1)4	executor.Execute(func() {5		fmt.Println("hello")6	})7	executor.Execute(func() {8		fmt.Println("world")9	})10	executor.HardStop()11}12import (13func main() {14	executor := NewExecutor(1)15	executor.Execute(func() {16		fmt.Println("hello")17	})18	executor.Execute(func() {19		fmt.Println("world")20	})21	executor.SoftStop()22}23import (24func main() {25	executor := NewExecutor(1)26	executor.Execute(func() {27		fmt.Println("hello")28	})29	executor.Execute(func() {30		fmt.Println("world")31	})32	executor.HardStop()33}34import (35func main() {36	executor := NewExecutor(1)37	executor.Execute(func() {38		fmt.Println("hello")39	})40	executor.Execute(func() {41		fmt.Println("world")42	})43	executor.HardStop()44}45import (46func main() {47	executor := NewExecutor(1)48	executor.Execute(func() {49		fmt.Println("hello")50	})51	executor.Execute(func() {52		fmt.Println("world")53	})54	executor.HardStop()55}56import (57func main() {58	executor := NewExecutor(1)59	executor.Execute(func() {60		fmt.Println("hello")61	})62	executor.Execute(func() {63		fmt.Println("world")64	})65	executor.HardStop()66}67import (68func main() {69	executor := NewExecutor(1)70	executor.Execute(func() {71		fmt.Println("hello")72	})73	executor.Execute(func() {74		fmt.Println("world")75	})76	executor.HardStop()77}

hardStop

Using AI Code Generation

1import (2func main() {3    fmt.Println("Start")4    time.Sleep(10 * time.Second)5    fmt.Println("End")6}7In this program, we are using the time.Sleep() method to stop the execution of the program for 10 seconds. So, the output will be:8import (9func main() {10    fmt.Println("Start")11    hardStop()12    fmt.Println("End")13}14func hardStop() {15    time.Sleep(10 * time.Second)16}17In this program, we are using the time.Sleep() method to stop the execution of the program for 10 seconds. So, the output will be:

hardStop

Using AI Code Generation

1import (2func main() {3	executor := NewExecutor(2)4	task := NewTask(func() {5		fmt.Println("Executing")6		time.Sleep(5 * time.Second)7		fmt.Println("Done Executing")8	})9	executor.Submit(task)10	task.Wait()11	executor.HardStop()12}13main.(*executor).HardStop(0xc0000a6000)14main.main()15import (16func main() {17	executor := NewExecutor(2)18	task := NewTask(func() {19		fmt.Println("Executing")20		time.Sleep(5 * time.Second)21		fmt.Println("Done Executing")22	})23	executor.Submit(task)24	task.Wait()25	executor.HardStop()26}27import (

hardStop

Using AI Code Generation

1import (2type Executor struct {3	stop   chan struct{}4	tasks  []func()5}6func NewExecutor() *Executor {7	return &Executor{8		stop: make(chan struct{}),9	}10}11func (e *Executor) Submit(task func()) {12	e.mu.Lock()13	defer e.mu.Unlock()14	if e.stop == nil {15	}16	e.tasks = append(e.tasks, task)17}18func (e *Executor) Stop() {19	e.mu.Lock()20	defer e.mu.Unlock()21	if e.stop == nil {22	}23	close(e.stop)24}25func (e *Executor) Run() {26	for {27		var task func()28		e.mu.Lock()29		if len(e.tasks) > 0 {30		}31		e.mu.Unlock()32		if task == nil {33		}34		task()35	}36}37func (e *Executor) hardStop() {38	e.mu.Lock()39	defer e.mu.Unlock()40	if e.stop == nil {41	}42	close(e.stop)43}44func (e *Executor) Errors() []error {45	e.mu.Lock()46	defer e.mu.Unlock()47}48func (e *Executor) addError(err error) {49	e.mu.Lock()50	defer e.mu.Unlock()51	e.errors = append(e.errors, err)52}53func main() {54	e := NewExecutor()55	e.Submit(func() {56		fmt.Println("hello")57	})58	e.Submit(func() {59		fmt.Println("world")60	})61	e.hardStop()62	e.Run()63}64import (65type Executor struct {66	stop   chan struct{}67	tasks  []func()68}69func NewExecutor() *Executor {70	return &Executor{71		stop: make(chan struct{}),72	}73}74func (e *Executor) Submit(task func()) {75	e.mu.Lock()76	defer e.mu.Unlock()77	if e.stop == nil {78	}

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