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Hello World the Rinda Way
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Services list themselves with a central RingServer, which then coordinates all communication between the services
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Where can I find Service X RingServer Listening on a Broadcast UDP Address
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Service X: 192168112
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Client 1921681100 Hi Service X @ 192168112 Service @ 192168112 Hi There 1921681100!
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The typical request life cycle of Rinda applications
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Building a RingServer is straightforward and simple In 3, RingyDingy, we ll discuss RingyDingy, a library that makes it even easier to use RingServers; but first we should write our own so we can understand exactly what it does
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require 'rinda/ring' require 'rinda/tuplespace' DRbstart_service Rinda::RingServernew(Rinda::TupleSpacenew) DRbthreadjoin
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Looking at the code for our RingServer, it should quickly leap out at you that we are making DRb calls Why is that, you might ask Simple Rinda sits on top of the DRb library This is great news for us, because we already understand how to use DRb When we see lines like DRbstart_service and DRbthreadjoin, we already know what they do That allows us to focus on the actual RingServer portion of this code First we need to require the Rinda libraries In particular, we need to require rinda/ring and rinda/tuplespace Once we ve done that and started the DRb service, we can start our RingServer with the following line:
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Rinda::RingServernew(Rinda::TupleSpacenew)
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When we create our RingServer, we pass it a new Rinda::TupleSpace class A
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TupleSpace3 essentially manages access to the Tuples4 it contains Before I explain
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what a TupleSpace and a Tuple are, I would like to point out that even though we are starting a server, we did not have to bind the RingServer to any IP address or port By default the RingServer binds to port 7647 You can change that by passing in an optional second parameter to the new method on Rinda::RingServer, like this:
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Rinda::RingServernew(Rinda::TupleSpacenew, 8080)
Now the RingServer will bind itself to port 8080 Now, let s talk about TupleSpaces and Tuples I said earlier that a TupleSpace manages access to the Tuples it contains But what does that mean Let me give you an analogy that might make this a bit clearer When you go into a coffee shop or grocery store, inevitably a bulletin board near the front door has a bunch of flyers pinned
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to it, advertising everything from guitar lessons to roommates to underwater basketweaving courses People come along and search the bulletin board, looking for something they need, or perhaps for a bit of a giggle If they find a posting they like, they can either take it off the board so that no one else will see it, or they can make a copy for themselves and leave the original up there for others to see We can think of a TupleSpace as that bulletin board It is a place where we can post our services The flyer is like the Tuple In our current example we would be posting a Hello World service Tuple to the TupleSpace So, armed with a basic understanding of the world of TupleSpaces and Tuples, we can start to rewrite our Hello World service using Rinda It should be noted that for the examples in this chapter to work, you must have a RingServer running in the background It is also important to remember to restart your RingServer between each new example to avoid potentially confusing results We will be iterating on many of these examples if we don t start/stop all our services between each build, things might start to get a bit confusing For now, let s rebuild that Hello World service that we originally built in 1 Here is what our Hello World service originally looked like:
require 'drb' class HelloWorldServer def say_hello "Hello, world!" end end DRbstart_service("druby://127001:61676", HelloWorldServernew) DRbthreadjoin
Now let s look at what this service will look like when we rewrite it using Rinda:
require 'rinda/ring' class HelloWorldServer include DRbUndumped
def say_hello "Hello, world!" end end DRbstart_service ring_server = Rinda::RingFingerprimary ring_serverwrite([:hello_world_service, :HelloWorldServer, HelloWorldServernew, 'I like to say hi!'], Rinda::SimpleRenewernew) DRbthreadjoin