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example_test.go
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example_test.go
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package boltdb_test
import (
"fmt"
"os"
"sync"
"github.com/AsynkronIT/protoactor-go/actor"
"github.com/AsynkronIT/protoactor-go/persistence"
"github.com/artyomturkin/protoactor-go-persistence-boltdb"
"github.com/boltdb/bolt"
)
//DataStore
type exampleDataStore struct {
providerState persistence.ProviderState
}
func (p *exampleDataStore) GetState() persistence.ProviderState {
return p.providerState
}
func newExampleDataStore(snapshotInterval int, db *bolt.DB) *exampleDataStore {
return &exampleDataStore{
providerState: boltdb.NewBoltProvider(snapshotInterval, db),
}
}
//Actor
type exampleActor struct {
persistence.Mixin
state string
}
//Command to print state with external sync
type Print struct {
wg *sync.WaitGroup
}
//ensure exampleActor is actor.Actor
var _ actor.Actor = (*exampleActor)(nil)
func (a *exampleActor) Receive(ctx actor.Context) {
switch msg := ctx.Message().(type) {
case *persistence.RequestSnapshot:
// PersistSnapshot when requested
a.PersistSnapshot(&Snapshot{State: a.state})
case *Snapshot:
// Restore from Snapshot
a.state = msg.State
case *Event:
// Persist all events received outside of recovery
if !a.Recovering() {
a.PersistReceive(msg)
}
// Set state to whatever message says
a.state = msg.State
case *Print:
fmt.Printf("State is %s\n", a.state)
msg.wg.Done()
}
}
func exampleActorProducer() actor.Actor {
return &exampleActor{}
}
func ExampleBoltProvider() {
tempPath := tempfile()
defer os.Remove(tempPath)
db, err := bolt.Open(tempPath, 0666, nil)
if err != nil {
panic(err)
}
wg := &sync.WaitGroup{}
props := actor.FromProducer(exampleActorProducer).
WithMiddleware(
persistence.Using(newExampleDataStore(4, db)),
)
pid, err := actor.SpawnNamed(props, "example.actor")
if err != nil {
panic(err)
}
//Send some messages to persist
for index := 0; index < 10; index++ {
pid.Tell(&Event{State: fmt.Sprintf("event-%d", index)})
}
//tell actor to print its state
wg.Add(1)
pid.Tell(&Print{wg: wg})
wg.Wait()
//stop actor, close db and reopen it
pid.GracefulPoison()
db.Close()
//reopen db and respawn actor
db, err = bolt.Open(tempPath, 0666, nil)
if err != nil {
panic(err)
}
props = actor.FromProducer(exampleActorProducer).
WithMiddleware(
persistence.Using(newExampleDataStore(4, db)),
)
pid, err = actor.SpawnNamed(props, "example.actor")
if err != nil {
panic(err)
}
//tell actor to print its state
wg.Add(1)
pid.Tell(&Print{wg: wg})
wg.Wait()
//stop actor, close db and reopen it
pid.GracefulPoison()
db.Close()
// Output:
// State is event-9
// State is event-9
}