EventMachine and some Ruby syntax

Question

I'm trying to get a better understanding of the following lines of code involving EventMachine. Trying to learn Ruby the hard way.

What does EventMachine.run does in this code?

What does |chunk| means in this case?

Also, what does 'while line' does? Is line a Ruby syntax? I couldn't seem to find anything related to that.

#create an HTTP request ob to URL above with user authorization
EventMachine.run do
  http = EventMachine::HttpRequest.new(url).get :head => { 'Authorization' => [ user, password ] }

# Initiate an empty string for the buffer
  buffer = ""

# Read the stream by line
  http.stream do |chunk|
    buffer += chunk
    while line = buffer.slice!(/.+\r?\n/) #cut each line at newline
      handle_tweet JSON.parse(line) #send each tweet object to handle_tweet method
    end

  end
end

You should learn some basis of ruby language. [Ruby Tutorial](http://en.wikibooks.org/wiki/Ruby_Programming) from WikiBooks can be helpful. — Flexoid, May 02 '12 at 05:59

score 0 · Answer 1 · answered May 02 '12 at 05:47

0

You may use debugger. The purpose of a debugger such as ruby-debug is to allow you to see what is going on “inside” a Ruby program while it executes. OR you may use logger. Logger provides a simple but sophisticated logging utility that you can use to display output messages.

answered May 02 '12 at 05:47

suvankar

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all you need to know about logger: http://www.ruby-doc.org/stdlib-1.9.3/libdoc/logger/rdoc/Logger.html – suvankar May 03 '12 at 07:15

EventMachine and some Ruby syntax

1 Answers1