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it s possible to set a maximum number of allowed connections by supplying more parameters to new: require 'gserver' class HelloServer < GServer def serve(io) io.puts("Say something to me:") line = io.gets io.puts("You said '#{line.chomp}'") end end server = HelloServer.new(1234, '127.0.0.1', 1) server.start server.join The new method for GServer accepts several parameters. In order, they are the port number to run the server(s) on, the name of the host or interface to run the server(s) on, the maximum number of connections to allow at once (set to 1 in this example), a file handle of where to send logging messages, and a true or false flag to turn logging on or off. As mentioned earlier, you can create multiple servers at once: require 'gserver' class HelloServer < GServer def serve(io) io.puts("Say something to me:") line = io.gets io.puts("You said '#{line.chomp}'") end end server = HelloServer.new(1234, '127.0.0.1', 1) server.start server2 = HelloServer.new(1235, '127.0.0.1', 1) server2.start sleep 10 Creating multiple servers is as easy as creating a new instance of HelloServer (or any GServer descendent class), assigning it to a variable, and calling its start method. Another difference between this example and the last is that at the end you don t call server.join. With GServer objects, join works in the same way as with Thread objects, where calling join waits for that thread to complete before continuing execution. In the first GServer examples, your programs would wait forever until you exited them manually (using Ctrl+C, for example). However, in the preceding example, you didn t call any join methods, and only slept for 10 seconds using sleep 10. This means the servers you created are only available on
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ports 1234 and 1235 for 10 seconds after running the program, at which point the program and its child threads all exit at once. Because GServer allows multiple servers to run at the same time without impeding the execution of the main program, you can manage the currently running servers by using several methods GServer makes available to start, stop, and check servers: require 'gserver' class HelloServer < GServer def serve(io) io.puts("To stop this server, type 'shutdown'") self.stop if io.gets =~ /shutdown/ end end server = HelloServer.new(1234) server.start loop do break if server.stopped end puts "Server has been terminated" This time you put the main program into a loop waiting for the server to be stopped. The server is stopped if someone connects and types shutdown, which triggers that server s stop method, leading to the whole server program ending. You can also check whether a GServer is running on a port without having the object reference available by using the in_service class method: if GServer.in_service (1234) puts "Can't create new server. Already running!" else server = HelloServer.new(1234) end
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With the knowledge picked up in the previous section, only a small jump in complexity is required to build a practical application using GServer. You ll build a simple chat server that allows a number of clients to connect and chat among each other. The first step is to subclass GServer into a new class, ChatServer, and override the new method with your own so that you can set up class variables to store client IDs and the chat log for all the clients to share: class ChatServer < GServer def initialize(*args) super(*args)
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# Keep an overall record of the client IDs allocated # and the lines of chat @@client_id = 0 @@chat = [] end end The main part of your program can be like your other GServer-based apps, with a basic initialization and a loop until the chat server shuts itself down: server = ChatServer.new(1234) server.start loop do break if server.stopped end
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