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Notice that we don t see bye bye anywhere in there The good news is we are not far from where we need to be Let s look at how we can fix this code to get the desired results:
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# If we don't make sure there is at least 1 # thing in the ARGV array an Exception will be raised! # This has to happen before we require 'starfish' ARGVunshift('clientrb') require 'rubygems' require 'starfish' local_logger = nil catch(:halt) do Starfishclient = lambda { |logger| local_logger = logger loggerinfo 'hi mr distributed logger' throw :halt } Starfishnew('distributed_logger')client end local_loggerinfo 'bye bye'
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The large difference in this code example from the previous example is the use of the Ruby throw/catch syntax First we wrap our Starfish code in a catch block It s important that we also wrap this line:
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If we had just wrapped the lambda that we send to the client class method, this would not work When we create a new instance of the Starfish class and call the client method on it, that is what runs the lambda we passed in, and that is what eventually calls the throw directive Finally, in the lambda we call throw :halt When the lambda is run, it sets the local variable local_logger to the distributed Logger instance, calls the info method on it with a message, and then calls the throw Our catch block gracefully handles the throw and lets our application move on to call the info method on the local variable local_logger and send it the message bye bye
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Now when we run this code we should get the following output on our server:
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hi mr distributed logger bye bye
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Again, a few more hacks to make this all work, but again, they are not insurmountable just unfortunate
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So far we have looked at how Starfish works We ve talked a lot about its weaknesses, but we haven t given the library a real chance to shine, so let s do just that To me, Starfish really excels as a means to do distributed queuing services By no means is it the only one of its kind in this area, or even in this book, but it certainly is one of the easier systems to use In this example we will create a server that serves up tasks for the client to process Sometimes there will be tasks, and sometimes there won t be Sometimes there might be n tasks, and sometimes there will be just one In the real world these tasks would most likely be fed from a database, the file system, or some other location In our simple example we will feed the server by creating task files in a specific directory The server then will serve them to the client The client will first process the task and then complete the task Let s see what our server will look like:
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# If we don't make sure there is at least 1 # thing in the ARGV array an Exception will be raised! # This has to happen before we require 'starfish' ARGVunshift('serverrb') require 'rubygems' require 'starfish' require 'fileutils' class TaskServer def each(&block) Dirglob(Filejoin(Filedirname(__FILE__), 'tasks', '*task'))each do |file_path| yield Tasknew(file_path)
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end end end class Task include DRbUndumped attr_accessor :file_path def initialize(file_path) selffile_path = file_path end def process Fileread(file_path) end def complete FileUtilsrm_f(file_path) end end Starfishserver = lambda { |object| object = TaskServernew } Starfishnew('task_server')server
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First we create our TaskServer class This class contains just one method, each The each method looks in a directory called tasks that is on the same level as the file we are running In that directory it finds all the *task files If it finds any files, it loops through them, creates a new Task instance, gives it the path to the task file, and then yields that new Task instance Our Task class is defined next Again, this class is quite simple It takes one parameter on initialization, which is the path to the task file It then defines process and complete methods In the process method we read the file and return its contents In the complete method we delete the task file from the system so that we don t accidentally process it again
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