Working with Politics in Java

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Working with Politics
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With our PorkSpendingTokenWorker registered with the system, we need to tell it what it should do if it becomes a leader We define this within our start method There is no requirement that this method name needs to be called start In theory, you do not even need a particular method; you could put it in your initialize method But I prefer to have my code a bit cleaner than that hence the separate method In our start method, we call the process method provided by the Politics:: TokenWorker module The process method is provided a block that tells the leader what to work on when the time comes In our block we tell the class to process five pieces of pork per iteration We call the pop method on the PorkSpendingQueue class If a piece of pork is returned to us (not a nil value), we print a message to the screen It tells us which PID, or process, has just spent the pork, and how much pork has been spent After we have processed a piece of pork, we sleep for 1 second At the bottom of our file you will notice these two lines:
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p = PorkSpendingTokenWorkernew pstart
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These lines are there so that if you execute the file, it will create a new instance of the PorkSpendingTokenWorker class and call its start method Now if we execute this class, we should see something similar to the following get printed to our screen:
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I, [2009-06-20T23:31:23335687 #2147] INFO -- : macbateshome:2147 elected leader at Sat Jun 20 23:31:23 -0400 2009 PID (2147) just spent: $14189445159 PID (2147) just spent: $14212980111 PID (2147) just spent: $14214658458 PID (2147) just spent: $14231583625 PID (2147) just spent: $14298736695 I, [2009-06-20T23:31:33336948 #2147] INFO -- : macbateshome:2147 elected leader at Sat Jun 20 23:31:33 -0400 2009 PID (2147) just spent: $14363023820 PID (2147) just spent: $14382726209 PID (2147) just spent: $14545065772
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Now if you were to start a second instance of the PorkSpendingTokenWorker class, you would see that it will, most likely, just sit there idle There is a possibility that at the end of the iteration it might become a leader, but I have found that in most
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6 Politics
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cases the original stays the leader until it is killed This is not always the case, however, and you certainly should not count on it when developing these classes
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Caveats
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The documentation that ships with Politics points out a few caveats that also should be mentioned here The first caveat is that Politics is not designed to work with multiple processes within the same Ruby VM This means that we cannot fire up two instances of the PorkSpendingTokenWorker class in the same Ruby VM If you want more than one instance of the class working on the same machine or virtual instance, you need to create a new Ruby VM for each instance The reason given for not being able to run more than one instance of a Politics class is that the algorithm used to choose a leader is only designed to pick a leader from a set of processes, not multiple instances within a single process The second caveat was briefly touched on in the main text The algorithm that selects the next leader is not guaranteed to choose the previous leader for the next iteration It has been my experience that most of the time, when a leader is elected, it tends to remain the leader for a long time; however, this is not certain You should not architect your classes to assume that there is a guaranteed order to the selection of a leader Classes should be designed with the idea that they will be a leader only once This means that you should avoid keeping state information pertinent to the leader in a particular Ruby VM If you need to store such information, you should place it in a database, Memcached, or other such storage that can be accessed by any instance that is chosen to be the leader
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