Typhoeus in Java

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Typhoeus
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In the Ruby implementations, Ruby 18 has a user-level thread implementation This has a negative impact on the performance of multi-threaded service clients in Ruby 18 Ruby 19 uses kernel-level threads, but it has a global interpreter lock (GIL) This means that even though the threads are kernel level, only one can run at a time in the interpreter This can also have a negative impact on performance JRuby and Rubinius use regular kernel-level threads that are scheduled by the operating system The different types of threading in the Ruby implementations means that threaded I/O performance can vary quite a bit from implementation to implementation Java users are accustomed to using multi-threaded techniques for achieving parallelism, but with Ruby, you have to be a bit more careful The difference in performance depends on how much data is returned in the service request and the response time of the services being called In tests using the different Ruby implementations, asynchronous clients are almost always faster than multi-threaded clients However, the difference between them can be quite small, depending on the specific case Testing and benchmarking your approach is always the best way to ensure that you re achieving your desired performance
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Typhoeus is a Ruby library with native C extensions to libcurl and libcurl-multi libcurl-multi provides an interface for performing asynchronous requests This makes Typhoeus an implementation that uses the asynchronous I/O reactor style to achieve parallelism Typhoeus has been tested with Ruby 186, 187, and 191 Before you can run through these examples, you first need to install the library Typhoeus requires a current version of libcurl, which can be found at http://curl haxxse/libcurl/ Once libcurl is installed, you can Typhoeus with the following:
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gem install pauldix-typhoeus --source=http://gemsgithubcom
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Now that you have Typhoeus installed, you re ready to make some requests Typhoeus has three classes that manage making HTTP requests: request, response, and hydra The request class contains all the information about a request, including the URI, the headers, the request body, and other parameters, such as timeout and authentication The response object holds information about the response, including
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the HTTP status code, the headers, the body, and the time taken hydra is the class that manages requests and runs them in parallel The following is a simple example:
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require 'rubygems' require 'typhoeus' hydra = Typhoeus::Hydranew request = Typhoeus::Requestnew("http://localhost:3000", :timeout => 100) requeston_complete do |response| puts responsecode puts responsebody end hydraqueue(request) hydrarun
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This example shows how to create a single request to a server running on the local machine First, you create the hydra object that will manage requests Then you create the request object The example also passes a timeout value that gives the request 100 milliseconds to complete before it times out At this point, the request has not yet been run Before you run it, you assign an on_complete handler This block of code is called after the request completes The block is yielded a response object Finally, you queue up the request in the hydra object and run it run is a blocking call that does not return until all queued requests are called For a single request, this looks like a lot of effort compared to a regular Net::HTTP call Only when you run more requests do the advantages of this asynchronous style become apparent For single requests like the preceding example, Typhoeus has a few shortcut methods to reduce the amount of setup and code required and run them right away:
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require 'rubygems' require 'typhoeus' response = Typhoeus::Requestget("http://localhost:3000", :timeout => 100) puts responsebody
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Typhoeus response = Typhoeus::Requestpost ("http://localhost:3000/posts",:body => "title=foo") puts responsecode response = Typhoeus::Requestput ("http://localhost:3000/posts/1",:body => "title=bar")
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response = Typhoeus::Requestdelete("http://localhost:3000/ posts/1")
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This example shows running GET, PUT, POST, and DELETE requests The options hash takes all the same options that the Request constructor takes The request is run immediately and the resulting response object is returned
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