require 'rinda/ring' DRbstart_service ring_server = Rinda::RingFingerprimary in Java

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require 'rinda/ring' DRbstart_service ring_server = Rinda::RingFingerprimary
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we would get the following exception:
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RuntimeError: RingNotFound
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Obviously using the primary method on Rinda::RingFinger won t work, because it s looking for a RingServer broadcasting on port 7647 So how do we find it Let s start by firing up a couple of RingServers so that we know when we have connected the correct one:
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require 'rinda/ring' require 'rinda/tuplespace' DRbstart_service [9000, 9001]each do |port| ts = Rinda::TupleSpacenew tswrite([:some_service, "#{Socketgethostname}-port: #{port}"]) end DRbthreadjoin
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Here we are starting up two RingServers One is on port 9000, and the other is on port 9001 We have written a Tuple to each of their TupleSpaces, identifying which server we are talking to This will make it easier for us in a minute to make sure the right RingServer is responding to us The first thing we have to do is create a new instance of Rinda::RingFinger Now, if we were to create the instance as follows,
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ring_finger = Rinda::RingFingernew
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we would not be doing anything different than what is happening under the covers when we call the primary class method We will still only be looking for RingServers broadcasting on port 7647 first on the network, and then on the localhost The new method on Rinda::RingFinger takes two parameters The first is an Array This Array defaults to ['<broadcast>', 'localhost'] These represent the hosts that we want to search for our RingServers An Array is used to specify order, so be aware that the order in which you have your servers listed in the Array will be the order in which they are searched If nil is passed in as the first argument, the list defaults to ['localhost'] I don t know why it defaults to just ['localhost'] and not ['<broadcast>', 'localhost'], but just be aware that it does If we knew that our RingServer was hosted at ringserverexamplecom on the default port of 7647, we would create a new Rinda::RingFinger like this:
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ring_finger = Rinda::RingFingernew(['ringserverexamplecom'])
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Getting back to our example, we have created two RingServers on ports 9000 and 9001, respectively Let s try to find the one on port 9001:
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require 'rinda/ring' DRbstart_service ring_finger = Rinda::RingFingernew(['<broadcast>', 'localhost'], 9001)
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When creating our Rinda::RingFinger, we wanted to re-create the default lookup behavior, so we passed in the Array of ['<broadcast>', 'localhost'] And since we wanted to look only on port 9001, we passed that in as the second parameter That code should run and exit without any errors The question still persists: How do we find a RingServer
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There are three ways we can find a RingServer once we have a properly configured Rinda::RingFinger The first method is to use the lookup_ring_any method This method is similar to the primary class method we are used to using It finds the first RingServer that meets the specifications of the Rinda::RingFinger we created and returns that
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ring_fingerlookup_ring_anyread([:some_service, nil])
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The next way of finding a RingServer is to use the each method The each method will iterate through each of the RingServers it finds that matches the Rinda::RingFinger we created and yield up each RingServer:
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ring_fingereach do |ring_server| ring_serverread([:some_service, nil]) end
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The final way of finding a RingServer is to use the primary accessor method This method has a major problem, however Because primary is an accessor method, it is possible that it can return nil if it has not been set You can either manually set the primary accessor yourself, or you can call either the each or lookup_ring_any method first, and it will set the primary accessor for you The lookup_ring_any method determines what the primary RingServer should be set to by using the last RingServer found So, by default, this is the one being served up by localhost If we were to change our host Array to be ['<broadcast>'], the primary RingServer would get set to the last server in the list This is usually either the last alphabetically or the last by IP address Because of this, I recommend not using the primary accessor, unless you are the one who is setting it
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require 'rinda/ring' DRbstart_service ring_finger = Rinda::RingFingernew(['<broadcast>', 'localhost'], 9001) puts ring_fingerprimaryinspect puts ring_fingerlookup_ring_anyread([:some_service, nil])inspect
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puts ring_fingerprimaryread([:some_service, nil])inspect ring_fingereach do |ring_server| puts ring_serverinspect puts ring_serverread([:some_service, nil])inspect end