Actors: send message to a class instead of an instance

Can't you just have a List of the actors, and 'foreach' to send the message to all of then? Or perhaps write an object 'FrontActor' that could do this for you. I don't know if any of those are good ideas, but anyway... =)

[]s,

2011/5/14 Xavier <xancorreu@gmail.com>

Hi,

Is it possible to pass a message to a class: to whole set of instances
of a specific class. Here I have the code:

import scala.actors._


class Fill extends Actor {
 def act = {
     react {
         case i:String =>
             println(i + ": rebut ")
     }
 }
}

class Mare extends Actor {
 def act = {
     react {
         Fill ! "hola"
     }
 }
}


object Main {
 def main(arg:Array[String]) = {
         var m = new Mare
         var fill = new Fill
         var fill2 = new Fill

         m.start
         fill.start
         fill2.start
     }
 }


m could pass a message to **all** instances of class Fill? How?

Thanks in advance,
Xan.

--
Paulo "JCranky" Siqueira
Visit my blog: http://www.jcranky.com/

On May 14, 9:12 pm, Paulo Siqueira wrote:
> Can't you just have a List of the actors, and 'foreach' to send the message
> to all of then?

Do you mean have a list of Fill instances in Mare class as a var?

Mare means Mother in catalan
Fill means Son in catalan.

The problem is to send a message from the Mother to all instances of
Sons.

> Or perhaps write an object 'FrontActor' that could do this
> for you.

Can you specify it?

> I don't know if any of those are good ideas, but anyway... =)
>
> []s,
>
> 2011/5/14 Xavier
>
>
>
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
> --
> Paulo "JCranky" Siqueira
> Visit my blog:http://www.jcranky.com/

Mmmm,
thanks.
Press return after complete message.

Xan.

On May 14, 9:12 pm, Paulo Siqueira wrote:
> Can't you just have a List of the actors, and 'foreach' to send the message
> to all of then? Or perhaps write an object 'FrontActor' that could do this
> for you. I don't know if any of those are good ideas, but anyway... =)
>
> []s,
>
> 2011/5/14 Xavier
>
>
>
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
> --
> Paulo "JCranky" Siqueira
> Visit my blog:http://www.jcranky.com/

You could auto-register all your instances with a global object using
a weak map. Then send your message to the object that will forward it
to all the instances:

trait Registered extends Actor {
Forwarder.register(this)
}

object Forwarder {
private val registered = new
scala.collection.mutable.WeakHashMap[Registered, Any]()
def register(actor: Registered) {
registered.put(actor, Nil)
}

def forward(message: Any) {
for (actor <- registered.keys) {
actor ! message
}
}
}

class Fill extends Actor with Registered {
def act = {
react {
case i:String =>
println(i + ": rebut ")
}
}
}

On Sat, May 14, 2011 at 1:43 PM, Xavier wrote:
> Hi,
>
> Is it possible to pass a message to a class: to whole set of instances
> of a specific class. Here I have the code:
>
> import scala.actors._
>
>
> class Fill extends Actor {
>  def act = {
>      react {
>          case i:String =>
>              println(i + ": rebut ")
>      }
>  }
> }
>
> class Mare extends Actor {
>  def act = {
>      react {
>          Fill ! "hola"
>      }
>  }
> }
>
>
> object Main {
>  def main(arg:Array[String]) = {
>          var m = new Mare
>          var fill = new Fill
>          var fill2 = new Fill
>
>          m.start
>          fill.start
>          fill2.start
>      }
>  }
>
>
> m could pass a message to **all** instances of class Fill? How?
>
> Thanks in advance,
> Xan.

Make the child actors register themself with the root actor, and let the root actor keep a list of all actors. When you want to update all, send a message to the root actor to perform the update. In the root actor, do a foreach on the list of child actors matching the type like Paulo Siqueira suggest, and send a message to each child actors to perform something.

case class Register(id: String, actor: Actor)
case object TriggerSomething(id: String)

rootActor = ...
childActor1 = ...
childActor2 = ...
childActor3 = ...
rootActor ! Register("id1", childActor1)
rootActor ! Register("id1", childActor2)
rootActor ! Register("id2", childActor3)
rootActor ! TriggerSomething("test1")

On 14 May 2011 20:43, Xavier <xancorreu@gmail.com> wrote:

Hi,

Is it possible to pass a message to a class: to whole set of instances
of a specific class. Here I have the code:

import scala.actors._


class Fill extends Actor {
 def act = {
     react {
         case i:String =>
             println(i + ": rebut ")
     }
 }
}

class Mare extends Actor {
 def act = {
     react {
         Fill ! "hola"
     }
 }
}


object Main {
 def main(arg:Array[String]) = {
         var m = new Mare
         var fill = new Fill
         var fill2 = new Fill

         m.start
         fill.start
         fill2.start
     }
 }


m could pass a message to **all** instances of class Fill? How?

Thanks in advance,
Xan.

Oh, and you should probably synchronized around the weak map... Or
make the Forwarder object itself an actor and only allow forwarding as
a response to a message.

On Sat, May 14, 2011 at 2:53 PM, Lex wrote:
> You could auto-register all your instances with a global object using
> a weak map. Then send your message to the object that will forward it
> to all the instances:
>
> trait Registered extends Actor {
>  Forwarder.register(this)
> }
>
> object Forwarder {
>  private val registered = new
> scala.collection.mutable.WeakHashMap[Registered, Any]()
>  def register(actor: Registered) {
>    registered.put(actor, Nil)
>  }
>
>  def forward(message: Any) {
>    for (actor <- registered.keys) {
>      actor ! message
>    }
>  }
> }
>
> class Fill extends Actor with Registered {
>  def act = {
>     react {
>         case i:String =>
>             println(i + ": rebut ")
>     }
>  }
> }
>
>

I like the idea of making the Forwarder an Actor itself better.

[]s,

2011/5/14 Lex <lexn82@gmail.com>

Oh, and you should probably synchronized around the weak map... Or
make the Forwarder object itself an actor and only allow forwarding as
a response to a message.


On Sat, May 14, 2011 at 2:53 PM, Lex <lexn82@gmail.com> wrote:
> You could auto-register all your instances with a global object using
> a weak map. Then send your message to the object that will forward it
> to all the instances:
>
> trait Registered extends Actor {
>  Forwarder.register(this)
> }
>
> object Forwarder {
>  private val registered = new
> scala.collection.mutable.WeakHashMap[Registered, Any]()
>  def register(actor: Registered) {
>    registered.put(actor, Nil)
>  }
>
>  def forward(message: Any) {
>    for (actor <- registered.keys) {
>      actor ! message
>    }
>  }
> }
>
> class Fill extends Actor with Registered {
>  def act = {
>     react {
>         case i:String =>
>             println(i + ": rebut ")
>     }
>  }
> }
>
>

--
Paulo "JCranky" Siqueira
Visit my blog: http://www.jcranky.com/

The idea is good. But what is "case class"?

Thanks,
Xan.

On May 14, 9:48 pm, Trond Olsen wrote:
> Make the child actors register themself with the root actor, and let the
> root actor keep a list of all actors. When you want to update all, send a
> message to the root actor to perform the update. In the root actor, do a
> foreach on the list of child actors matching the type like Paulo Siqueira
> suggest, and send a message to each child actors to perform something.
>
> case class Register(id: String, actor: Actor)
> case object TriggerSomething(id: String)
>
> rootActor = ...
> childActor1 = ...
> childActor2 = ...
> childActor3 = ...
> rootActor ! Register("id1", childActor1)
> rootActor ! Register("id1", childActor2)
> rootActor ! Register("id2", childActor3)
> rootActor ! TriggerSomething("test1")
>
> On 14 May 2011 20:43, Xavier wrote:
>
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
>

I like it very much, Lex.

On May 14, 9:53 pm, Lex wrote:
> You could auto-register all your instances with a global object using
> a weak map. Then send your message to the object that will forward it
> to all the instances:
>
> trait Registered extends Actor {
>   Forwarder.register(this)
>
> }
>
> object Forwarder {
>   private val registered = new
> scala.collection.mutable.WeakHashMap[Registered, Any]()
>   def register(actor: Registered) {
>     registered.put(actor, Nil)
>   }
>
>   def forward(message: Any) {
>     for (actor <- registered.keys) {
>       actor ! message
>     }
>   }
>
> }
>
> class Fill extends Actor with Registered {
>   def act = {
>      react {
>          case i:String =>
>              println(i + ": rebut ")
>      }
>   }
>
> }
> On Sat, May 14, 2011 at 1:43 PM, Xavier wrote:
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
>

About case classes: http://www.scala-lang.org/node/107

[]s,

2011/5/16 Xavier <xancorreu@gmail.com>

I like it very much, Lex.

On May 14, 9:53 pm, Lex <lex...@gmail.com> wrote:
> You could auto-register all your instances with a global object using
> a weak map. Then send your message to the object that will forward it
> to all the instances:
>
> trait Registered extends Actor {
>   Forwarder.register(this)
>
> }
>
> object Forwarder {
>   private val registered = new
> scala.collection.mutable.WeakHashMap[Registered, Any]()
>   def register(actor: Registered) {
>     registered.put(actor, Nil)
>   }
>
>   def forward(message: Any) {
>     for (actor <- registered.keys) {
>       actor ! message
>     }
>   }
>
> }
>
> class Fill extends Actor with Registered {
>   def act = {
>      react {
>          case i:String =>
>              println(i + ": rebut ")
>      }
>   }
>
> }
> On Sat, May 14, 2011 at 1:43 PM, Xavier <xancor...@gmail.com> wrote:
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
>

--
Paulo "JCranky" Siqueira
Visit my blog: http://www.jcranky.com/

There was an error in the example. The last one should be a case class, not a case object since it has variables. You can read more about case classes on http://www.artima.com/pins1ed/case-classes-and-pattern-matching.html also.

case class Add(group: String, actor: Actor)
case class TriggerActionOn(group: String)

rootActor = ...
childActor1 = ...
childActor2 = ...
childActor3 = ...
rootActor ! Add(group="a", actor=childActor1)
rootActor ! Add(group="a", actor=childActor2)
rootActor ! Add(group="b", actor=childActor3)
rootActor ! TriggerActionOn(group="a")


On 16 May 2011 21:56, Xavier <xancorreu@gmail.com> wrote:

The idea is good. But what is "case class"?

Thanks,
Xan.

On May 14, 9:48 pm, Trond Olsen <tr...@steinbit.org> wrote:
> Make the child actors register themself with the root actor, and let the
> root actor keep a list of all actors. When you want to update all, send a
> message to the root actor to perform the update. In the root actor, do a
> foreach on the list of child actors matching the type like Paulo Siqueira
> suggest, and send a message to each child actors to perform something.
>
> case class Register(id: String, actor: Actor)
> case object TriggerSomething(id: String)
>
> rootActor = ...
> childActor1 = ...
> childActor2 = ...
> childActor3 = ...
> rootActor ! Register("id1", childActor1)
> rootActor ! Register("id1", childActor2)
> rootActor ! Register("id2", childActor3)
> rootActor ! TriggerSomething("test1")
>
> On 14 May 2011 20:43, Xavier <xancor...@gmail.com> wrote:
>
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
>

Thanks for references,
Xan.

Al 17/05/11 01:19, En/na Trond Olsen ha escrit:

BANLkTinavUUjsQsYegU8ZZW74yXjU4yPug [at] mail [dot] gmail [dot] com" type="cite">There was an error in the example. The last one should be a case class, not a case object since it has variables. You can read more about case classes on http://www.artima.com/pins1ed/case-classes-and-pattern-matching.html also.

case class Add(group: String, actor: Actor)
case class TriggerActionOn(group: String)

rootActor = ...
childActor1 = ...
childActor2 = ...
childActor3 = ...
rootActor ! Add(group="a", actor=childActor1)
rootActor ! Add(group="a", actor=childActor2)
rootActor ! Add(group="b", actor=childActor3)
rootActor ! TriggerActionOn(group="a")


On 16 May 2011 21:56, Xavier <xancorreu [at] gmail [dot] com" rel="nofollow">xancorreu@gmail.com> wrote:

The idea is good. But what is "case class"?

Thanks,
Xan.

On May 14, 9:48 pm, Trond Olsen <tr [dot] [dot] [dot] [at] steinbit [dot] org" rel="nofollow">tr...@steinbit.org> wrote:
> Make the child actors register themself with the root actor, and let the
> root actor keep a list of all actors. When you want to update all, send a
> message to the root actor to perform the update. In the root actor, do a
> foreach on the list of child actors matching the type like Paulo Siqueira
> suggest, and send a message to each child actors to perform something.
>
> case class Register(id: String, actor: Actor)
> case object TriggerSomething(id: String)
>
> rootActor = ...
> childActor1 = ...
> childActor2 = ...
> childActor3 = ...
> rootActor ! Register("id1", childActor1)
> rootActor ! Register("id1", childActor2)
> rootActor ! Register("id2", childActor3)
> rootActor ! TriggerSomething("test1")
>
> On 14 May 2011 20:43, Xavier <xancor [dot] [dot] [dot] [at] gmail [dot] com" rel="nofollow">xancor...@gmail.com> wrote:
>
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
>

Thanks for references,
Xan.

Al 17/05/11 01:07, En/na Paulo Siqueira ha escrit:

BANLkTinracbi9F4HGMQT3Lezqsmz-M1v_A [at] mail [dot] gmail [dot] com" type="cite">About case classes: http://www.scala-lang.org/node/107

[]s,

2011/5/16 Xavier <xancorreu [at] gmail [dot] com" rel="nofollow">xancorreu@gmail.com>

I like it very much, Lex.

On May 14, 9:53 pm, Lex <lex [dot] [dot] [dot] [at] gmail [dot] com" rel="nofollow">lex...@gmail.com> wrote:
> You could auto-register all your instances with a global object using
> a weak map. Then send your message to the object that will forward it
> to all the instances:
>
> trait Registered extends Actor {
>   Forwarder.register(this)
>
> }
>
> object Forwarder {
>   private val registered = new
> scala.collection.mutable.WeakHashMap[Registered, Any]()
>   def register(actor: Registered) {
>     registered.put(actor, Nil)
>   }
>
>   def forward(message: Any) {
>     for (actor <- registered.keys) {
>       actor ! message
>     }
>   }
>
> }
>
> class Fill extends Actor with Registered {
>   def act = {
>      react {
>          case i:String =>
>              println(i + ": rebut ")
>      }
>   }
>
> }
> On Sat, May 14, 2011 at 1:43 PM, Xavier <xancor [dot] [dot] [dot] [at] gmail [dot] com" rel="nofollow">xancor...@gmail.com> wrote:
> > Hi,
>
> > Is it possible to pass a message to a class: to whole set of instances
> > of a specific class. Here I have the code:
>
> > import scala.actors._
>
> > class Fill extends Actor {
> >  def act = {
> >      react {
> >          case i:String =>
> >              println(i + ": rebut ")
> >      }
> >  }
> > }
>
> > class Mare extends Actor {
> >  def act = {
> >      react {
> >          Fill ! "hola"
> >      }
> >  }
> > }
>
> > object Main {
> >  def main(arg:Array[String]) = {
> >          var m = new Mare
> >          var fill = new Fill
> >          var fill2 = new Fill
>
> >          m.start
> >          fill.start
> >          fill2.start
> >      }
> >  }
>
> > m could pass a message to **all** instances of class Fill? How?
>
> > Thanks in advance,
> > Xan.
>
>

--
Paulo "JCranky" Siqueira
Visit my blog: http://www.jcranky.com/