source: doc/theses/colby_parsons_MMath/benchmarks/actors/proto/Repeat/GoRepeat.go

// https://github.com/AsynkronIT/protoactor-go
// https://pkg.go.dev/github.com/AsynkronIT/protoactor-go/actor
package main

import (
        "os"; "strconv"; "fmt"; "time"; "runtime"; "sync/atomic"
        "github.com/asynkron/protoactor-go/actor"
)

var Messages, Times uint64 = 100_000, 10
var Processors int = 4

var starttime time.Time;
var shake = make( chan string )
var actorCnt uint64 = 0

type IntMsg struct { val int }
type CharMsg struct { val rune }
type StateMsg struct {}

var statemsg StateMsg

type Client struct {
        servers [] * actor.PID;
        intmsg [] IntMsg;
        charmsg [] CharMsg;
        results, times uint64;
}
type Server struct {}

var system * actor.ActorSystem
var client * actor.PID

func ( state * Server ) Receive( context actor.Context ) {
        switch msg := context.Message().(type) {
          case * IntMsg:
                msg.val = 7
                system.Root.Send( client, msg )
          case * CharMsg:
                msg.val = 'x'
                system.Root.Send( client, msg )
          case * StateMsg:
                if ( atomic.AddUint64( &actorCnt, 1 ) == Messages + 1 ) {
                        shake <- "hand"
                } // if
          default:
                // ignore actor.Started message
        }
}

func process( state * Client, context * actor.Context  ) {
        state.results++
        if ( state.results == 2 * Messages ) {
                state.times += 1
                if ( state.times == Times ) {
                        for i := uint64(0); i < Messages; i += 1 {
                                system.Root.Send( state.servers[i], &statemsg )
                        }
                        if ( atomic.AddUint64( &actorCnt, 1 ) == Messages + 1 ) {
                                shake <- "hand"
                        } // if
                        return
                }
                state.results = 0
                system.Root.Send( (*context).Self(), &statemsg )
        }
}


func ( state * Client ) Receive( context actor.Context ) {
        switch context.Message().(type) {
          case * IntMsg:
                process( state, &context )
          case * CharMsg:
                process( state, &context )
          case * StateMsg:
                for i := uint64(0); i < Messages; i += 1 {
                        system.Root.Send( state.servers[i], &state.intmsg[i] )
                        system.Root.Send( state.servers[i], &state.charmsg[i] )
                }
          default:
                // ignore actor.Started message
        }
}

func usage() {
        fmt.Printf( "Usage: %v " +
                "[ messages (> 0) | 'd' (default %v) ] " +
                "[ processors (> 0) | 'd' (default %v) ] " +
                "[ Times (> 0) | 'd' (default %v) ]\n",
                os.Args[0], Messages, Processors, Times );
        os.Exit( 1 );
}

func main() {
        switch len( os.Args ) {
          case 4:
                if os.Args[3] != "d" {                                                  // default ?
                        Times, _ = strconv.ParseUint( os.Args[3], 10, 64 )
                        if Times < 1 { usage(); }
                } // if
                fallthrough
          case 3:
                if os.Args[2] != "d" {                                                  // default ?
                        Processors, _ = strconv.Atoi( os.Args[2] )
                        if Processors < 1 { usage(); }
                } // if
                fallthrough
          case 2:
                if os.Args[1] != "d" {                                                  // default ?
                        Messages, _ = strconv.ParseUint( os.Args[1], 10, 64 )
                        if Messages < 1 { usage(); }
                } // if
          case 1:                                                                                       // use defaults
          default:
                usage();
        } // switch

        runtime.GOMAXPROCS( Processors );
        
        starttime = time.Now();

        system = actor.NewActorSystem();
        servers := make( [] * actor.PID, Messages );
        intmsg := make( []IntMsg, Messages );
        charmsg := make( []CharMsg, Messages );

        props := actor.PropsFromProducer( func() actor.Actor { return &Client{ servers, intmsg, charmsg, 0, 0 } })
        client = system.Root.Spawn(props)

        for r := uint64(0); r < Messages; r += 1 { // create messages and actors
                props := actor.PropsFromProducer( func() actor.Actor { return &Server{} })
                servers[r] = system.Root.Spawn(props)
        } // for

        system.Root.Send( client, &statemsg );

        <- shake // wait for actors to finish

        fmt.Printf( "%.2f\n", time.Since( starttime ).Seconds() );
} // main

// /usr/bin/time -f "%Uu %Ss %Er %Mkb" GoMatrix

// Local Variables: //
// tab-width: 4 //
// compile-command: "go build" //
// End: //