in my model, I have:
attr_accessor :socket
in my controller I have
def toServer(s)
begin
if(@socket == nil)
@socket = TCPSocket::new(@channel.serverip, @channel.port)
end
@socket.send(s,0)
rescue
return
end
end
I have a dropdown list in the view that lets the user select a
different channel, thus, the socket is created in the view based on
the ip and port of the selected channel.
Usually, however, the channel info will remain the same. So I am
wondering how I can make the socket persist from one POST/GET
operation to the other, unless the channel has changed.
And my second question is, if I someone does tell me how I can make it
persist, do I run the risk of some sort of memory leaks here with
this? I wonder because I have a solitary TCPSocket object which would
then be reassigned -- does the un-assigned old reference that socket
contained go automatically out of scope and get garbage collected?
Thanks, Janna B
repeatedly in my controller, naturally,
On Jul 5, 8:59 am, JannaB <mistressja...-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org> wrote:> > > Usually, however, the channel info will remain the same. So I am > wondering how I can make the socket persist from one POST/GET > operation to the other, unless the channel has changed. > > And my second question is, if I someone does tell me how I can make it > persist, do I run the risk of some sort of memory leaks here with > this? I wonder because I have a solitary TCPSocket object which would > then be reassigned -- does the un-assigned old reference that socket > contained go automatically out of scope and get garbage collected? > Thanks, Janna BIf you reassign a variable then its old contents will eventually be garbage collected (assuming no other references to it). You are likely to run into other problems though here: have you thought about concurrent users using the app at the same time, or what happens when you have multiple mongrels / passenger instances ? Lastly it looks like @socket is an instance variable of your controller, since every request is served by a new controller instance @socket will always be nil. Fred> repeatedly in my controller, naturally,
Thanks Fred, Yes, multiple users are not a problem as part of what is passed through the socket is the reference to the user. I have numerous channels that can be run, however, each with a different port assignement, by various users. Thus, it would seem I want to create a hash of channels => sockets but how can I make that be persistent? -Janna B On Jul 5, 11:11 am, Frederick Cheung <frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> On Jul 5, 8:59 am, JannaB <mistressja...-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org> wrote: > > > > > Usually, however, the channel info will remain the same. So I am > > wondering how I can make the socket persist from one POST/GET > > operation to the other, unless the channel has changed. > > > And my second question is, if I someone does tell me how I can make it > > persist, do I run the risk of some sort of memory leaks here with > > this? I wonder because I have a solitary TCPSocket object which would > > then be reassigned -- does the un-assigned old reference that socket > > contained go automatically out of scope and get garbage collected? > > Thanks, Janna B > > If you reassign a variable then its old contents will eventually be > garbage collected (assuming no other references to it). > You are likely to run into other problems though here: have you > thought about concurrent users using the app at the same time, or what > happens when you have multiple mongrels / passenger instances ? > > Lastly it looks like @socket is an instance variable of your > controller, since every request is served by a new controller instance > @socket will always be nil. > > Fred > > > repeatedly in my controller, naturally,
Then would the following be a problem in a controller if concurrent
users use the app at the same time ?
socket = TCPSocket::new(@channel.serverip,
@channel.port)
socket.send(s+"\n",0)
socket.close
(multiple servers I am not concerned about -- one glassfish gem
instance roars with all the horsepower this particular app ever needs
-- but what WOULD happen if I ran this under multiple mongrel
instances? Can''t the same port be shared by multiple instances?)
On Jul 6, 1:53 pm, JannaB <mistressja...-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org> wrote:> Then would the following be a problem in a controller if concurrent > users use the app at the same time ? > > socket = TCPSocket::new(@channel.serverip, > @channel.port) > socket.send(s+"\n",0) > socket.close> > (multiple servers I am not concerned about -- one glassfish gem > instance roars with all the horsepower this particular app ever needs > -- but what WOULD happen if I ran this under multiple mongrel > instances? Can''t the same port be shared by multiple instances?)The various instances would just be completely unaware that another instance already had a socket. if you had multiple instances inside a single glassfish process and if you were storing socket in somewhere that persisted across requests then it could potentially go wrong. No one''s going to be very happy if two different threads try to write to the same socket at the same time. Fred