/** %% Creates a TCP socket server. Expects a Host (e.g., 'localhost') and a PortNo and returns a server plus its corresponding client. This client is an instance of Open.socket, and is the interface for reading and writing into the socket.
%% MakeServer blocks until the server listens. However, waiting until a connection has been accepted happens in its own thread (i.e. MakeServer does only block until the server listens).
%% NB: A port can be used only once, so assign it carefully. In case this postnnumber was shortly used before, you may need to wait a bit before reusing it.
%% */
%% !! Alternatively, let it assign automatically and output the port number..
%%
%% NOTE: for supporting multiple connections see http://www.mozart-oz.org/documentation/op/node13.html#section.sockets.accept
proc {MakeServer Host PortNo ?MyServer ?MyClient}
proc {Accept MyClient}
thread H in % P
%% suspends until a connection has been accepted
{MyServer accept(host:H
acceptClass:Open.socket
accepted:?MyClient)}
% {Myserver accept(host:H port:P)} % suspends until a connection has been accepted
%% !!?? port number of client is usually created randomly..
{System.showInfo "% connection accepted from host "#H}
end
%% !!???
%% If Accept is called recursively, then server accepts multiple connections. These share the same compiler instance (e.g. variable bindings are shared). For multiple independent compiler instances call the OzServer application multiple times.
%% However, how shall the output for multiple connections be sorted?? Would using the different client sockets created with the Server accept method work?
%% NB: The number of clients accepted concurrently must be limited to the number set by {MyServer listen}
% {Accept}
end
in
MyServer = {New Open.socket init}
%% To avoid problems with portnumbers, the port could be assigned automatically and then output..
%%{MyServer bind(port:PortNo)}
{MyServer bind(host:Host takePort:PortNo)}
{MyServer listen}
{System.showInfo "% OzServer started at host "#Host#" and port "#PortNo}
%% !! Is this the right way to stop the processing??
%%
%% abort condition when client stream ended (i.e. nothing was sent)
if In == nil
then {System.showInfo "socket stream ended"}
Stream = nil
else Stream = In | {Aux Socket Size}
end
end
in
/** %% The socket Server returns a stream of the strings it receives. The Server always waits until someone writes something into the socket, then the input is immediately written to a stream and the Server waits again.
