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A machine on an IP-based network has one or many unique IP addresses. When data is sent across the network to a particular IP address, the machine with that address will receive the data. When you use the Web and access a web site such as http://www.apress.com, your computer first asks a Domain Name Service (DNS) server for the IP address associated with the hostname www.apress.com. Once it gets the raw address in response (in this case 66.211.109.45), your web browser makes a connection to that machine on port 80. Machines can make and receive connections on different TCP (or UDP) ports (from a range of 0 through 65,535), and different ports are assigned to different types of services. For example, port 80 is the default port used for web servers. Next in this chapter, we re going to look at how to perform operations over an IP-based network, such as checking the availability of machines on the network, and we ll create basic TCP and UDP clients and servers.

Network programming is usually a difficult process. At the lowest levels it involves a lot of arcane terminology and interfacing with antique libraries. However, Ruby is not usual, and Ruby s libraries take away most of the complexities usually associated with network programming. In this section, we re going to look at how to achieve a few basic networking operations, such as checking whether a server is present on a network, looking at how data is routed across the network between two points, and how to connect directly to a service offered on a remote machine.

One of the most basic network operations you can perform is a ping, a simple check that another machine is available on the network or that a service it offers is available. One ping library that s available is net-ping, which is available as a gem with gem install net-ping. net-ping can interface with your operating system s ping command to get a reliable response. It can also connect directly to services offered by a remote machine to gauge whether it s responding to requests or not. require 'rubygems' require 'net/ping' if Net::PingExternal.new('www.google.com').ping puts "Pong!" else puts "No response" end

With this completed, your class is set up to notify bound clients of changes to the Title and ISBN properties. But you still need to take one more step. By default, when you bind a source to a target, the BindingMode is set to OneWay binding, which means that the source will send the data to the target, but the target will not send data changes back to the source. In order to get the target to update the source, you need to implement two-way (TwoWay) binding.

Figure 3-37. Running the MGX MGrammar executor tool to generate the SandwichLanguage.m file Loading this file into Intellipad (see Figure 3-38), you can see that it is an M Graph almost exactly the same as the one generated earlier when you made the final revisions to the DSL Grammar code prior to setting up for the deployment phase. The one difference is that the graph is now defined within the LunchCounter module.

Pong! However, if you want to check whether a particular service is available, rather than a machine in general, you can use net-ping to connect to a specific port using TCP or UDP: require 'rubygems' require 'net/ping' if Net::PingTCP.new('www.google.com', 80).ping puts "Pong!" else puts "No response" end In this instance, you connect directly to www.google.com s HTTP port as if you were a web browser, but once you get a connection you immediately disconnect again. This allows you to verify that www.google.com is accepting HTTP connections.

Most Ruby networking libraries allow you to specify domain names and hostnames when you want to interact with a remote server, and automatically resolve these names into IP addresses. However, this adds a small overhead, so in some situations you might prefer to resolve IP addresses ahead of time yourself. You might also use DNS queries to check for the existence of different hostnames and to check whether a domain is active or not, even if it s not pointing to a web server.

resolv is a library in the Ruby standard library, and it offers several methods that are useful for converting between hostnames and IP addresses: require 'resolv' puts Resolv.getaddress("www.google.com")

OneTime binding. In this mode, the values are sent to the target control property when the object is set to the DataContext. However, the values of the target property are not updated when the