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actor.go
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actor.go
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// Copyright (c) 2016-2021, Jan Cajthaml <jan.cajthaml@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package actorsystem
import (
"fmt"
"sync"
)
// ReceiverFunction is function that processes Context and transitions state
type ReceiverFunction func(data Context) ReceiverFunction
type actorsMap struct {
sync.RWMutex
underlying map[string]*Actor
}
// Load works same as get from map
func (rm *actorsMap) Load(key string) (*Actor, bool) {
rm.RLock()
defer rm.RUnlock()
result, ok := rm.underlying[key]
return result, ok
}
// Delete works same as delete from map
func (rm *actorsMap) Delete(key string) *Actor {
rm.Lock()
defer rm.Unlock()
result, ok := rm.underlying[key]
if !ok {
return nil
}
delete(rm.underlying, key)
return result
}
// Store works same as store to map
func (rm *actorsMap) Store(key string, value *Actor) {
rm.Lock()
defer rm.Unlock()
rm.underlying[key] = value
}
// Coordinates represents actor namespace
type Coordinates struct {
Name string
Region string
}
func (ref Coordinates) String() string {
return ref.Region + "/" + ref.Name
}
// Context represents actor message envelope
type Context struct {
Data interface{}
Self *Actor
Receiver Coordinates
Sender Coordinates
}
// Actor represents single actor
type Actor struct {
Name string
receive ReceiverFunction
Backlog chan Context
Exit chan interface{}
}
// NewActor returns new actor instance
func NewActor(name string, receive ReceiverFunction) *Actor {
return &Actor{
Name: name,
receive: receive,
Backlog: make(chan Context, 1024),
Exit: make(chan interface{}),
}
}
// Tell queues message to actor
func (ref *Actor) Tell(data interface{}, receiver Coordinates, sender Coordinates) (err error) {
if ref == nil {
return fmt.Errorf("actor reference %v not found", ref)
}
select {
case ref.Backlog <- Context{
Data: data,
Self: ref,
Receiver: receiver,
Sender: sender,
}:
return nil
default:
return fmt.Errorf("actor %s backlog is full", ref.Name)
}
}
func (ref *Actor) String() string {
if ref == nil {
return "<Deadletter>"
}
return ref.Name
}
// Receive dequeues message to actor
func (ref *Actor) Receive(msg Context) {
if ref.receive == nil {
return
}
ref.receive = ref.receive(msg)
}