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actor_lock.go
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actor_lock.go
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// ------------------------------------------------------------
// Copyright (c) Microsoft Corporation and Dapr Contributors.
// Licensed under the MIT License.
// ------------------------------------------------------------
package actors
import (
"sync"
"github.com/pkg/errors"
"go.uber.org/atomic"
)
var (
ErrMaxStackDepthExceeded error = errors.New("Maximum stack depth exceeded")
)
type ActorLock struct {
methodLock *sync.Mutex
requestLock *sync.Mutex
activeRequest *string
stackDepth *atomic.Int32
maxStackDepth int32
}
func NewActorLock(maxStackDepth int32) ActorLock {
return ActorLock{
methodLock: &sync.Mutex{},
requestLock: &sync.Mutex{},
activeRequest: nil,
stackDepth: atomic.NewInt32(int32(0)),
maxStackDepth: maxStackDepth,
}
}
func (a *ActorLock) Lock(requestID *string) error {
currentRequest := a.getCurrentID()
if a.stackDepth.Load() == a.maxStackDepth {
return ErrMaxStackDepthExceeded
}
if currentRequest == nil || *currentRequest != *requestID {
a.methodLock.Lock()
a.setCurrentID(requestID)
a.stackDepth.Inc()
} else {
a.stackDepth.Inc()
}
return nil
}
func (a *ActorLock) Unlock() {
a.stackDepth.Dec()
if a.stackDepth.Load() == 0 {
a.clearCurrentID()
a.methodLock.Unlock()
}
}
func (a *ActorLock) getCurrentID() *string {
a.requestLock.Lock()
defer a.requestLock.Unlock()
return a.activeRequest
}
func (a *ActorLock) setCurrentID(id *string) {
a.requestLock.Lock()
defer a.requestLock.Unlock()
a.activeRequest = id
}
func (a *ActorLock) clearCurrentID() {
a.requestLock.Lock()
defer a.requestLock.Unlock()
a.activeRequest = nil
}