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Merge pull request asynkron#211 from PotterDai/implement-guardian
Implement Guardian
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,82 @@ | ||
package actor | ||
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import ( | ||
"errors" | ||
"sync" | ||
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"github.com/AsynkronIT/protoactor-go/log" | ||
) | ||
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type guardiansValue struct { | ||
guardians *sync.Map | ||
} | ||
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var guardians = &guardiansValue{&sync.Map{}} | ||
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func (gs *guardiansValue) getGuardianPid(s SupervisorStrategy) *PID { | ||
if g, ok := gs.guardians.Load(s); ok { | ||
return g.(*guardianProcess).pid | ||
} | ||
g := gs.newGuardian(s) | ||
gs.guardians.Store(s, g) | ||
return g.pid | ||
} | ||
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// newGuardian creates and returns a new actor.guardianProcess with a timeout of duration d | ||
func (gs *guardiansValue) newGuardian(s SupervisorStrategy) *guardianProcess { | ||
ref := &guardianProcess{strategy: s} | ||
id := ProcessRegistry.NextId() | ||
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pid, ok := ProcessRegistry.Add(ref, "guardian"+id) | ||
if !ok { | ||
plog.Error("failed to register guardian process", log.Stringer("pid", pid)) | ||
} | ||
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ref.pid = pid | ||
return ref | ||
} | ||
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type guardianProcess struct { | ||
pid *PID | ||
strategy SupervisorStrategy | ||
} | ||
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func (g *guardianProcess) SendUserMessage(pid *PID, message interface{}) { | ||
panic(errors.New("Guardian actor cannot receive any user messages")) | ||
} | ||
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func (g *guardianProcess) SendSystemMessage(pid *PID, message interface{}) { | ||
if msg, ok := message.(*Failure); ok { | ||
g.strategy.HandleFailure(g, msg.Who, msg.RestartStats, msg.Reason, msg.Message) | ||
} | ||
} | ||
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func (g *guardianProcess) Stop(pid *PID) { | ||
//Ignore | ||
} | ||
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func (g *guardianProcess) Children() []*PID { | ||
panic(errors.New("Guardian does not hold its children PIDs")) | ||
} | ||
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func (*guardianProcess) EscalateFailure(reason interface{}, message interface{}) { | ||
panic(errors.New("Guardian cannot escalate failure")) | ||
} | ||
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func (*guardianProcess) RestartChildren(pids ...*PID) { | ||
for _, pid := range pids { | ||
pid.sendSystemMessage(restartMessage) | ||
} | ||
} | ||
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func (*guardianProcess) StopChildren(pids ...*PID) { | ||
for _, pid := range pids { | ||
pid.sendSystemMessage(stopMessage) | ||
} | ||
} | ||
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func (*guardianProcess) ResumeChildren(pids ...*PID) { | ||
for _, pid := range pids { | ||
pid.sendSystemMessage(resumeMailboxMessage) | ||
} | ||
} |
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