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This chapter covers the basics of connecting to services Making requests in parallel is a necessary component of building service clients that perform well enough to be run inside the request/response lifecycle To achieve this, requests can be run asynchronously or in multiple threads Generally, asynchronous clients perform a little better than multi-threaded clients, but this may vary depending on the specific environment The next chapter goes into the details about how to write fully featured client libraries The goal is to write clients that are well tested, that support mocking, and that provide simple, readable interfaces
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C HAPTER 7 Developing Service Client Libraries
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Client libraries represent the usable interface of services for developers in the rest of an application That is, services are called through their client-side libraries instead of directly through HTTP Client libraries provide an additional layer of abstraction that makes working with services easier for front-end application developers Thus, developing, organizing, and deploying client libraries are key parts of service-oriented design Good libraries include client-side validation, clear and well-documented APIs, connection and request abstraction, and simple methods for mocking This chapter covers how to tackle each of these issues and looks at writing client libraries that conform to Rails 30 s ActiveModel
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Packaging
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The first step when designing a new library is to organize the structure of the files and directories This includes how to package the library for deployment and installation on other computers RubyGems is the obvious choice for creating and sharing libraries This is true even for service client libraries that are private and will be shared only by internal services and developers Gems can be deployed via a private file server, a local gem server, or inside the Bundler cache of an application
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7 Developing Service Client Libraries
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Bundler (http://gembundlercom) is a new system of managing an application s packages It is part of how Rails 3 manages dependencies The gem files, which are built gems, can be placed in an application s local Bundler cache so that they can be installed by Bundler without checking a remote gem server In Rails, the cache is located in the vendor/ bundler/ruby/18/cache/ directory In place of 18, you substitute the version of Ruby that your application is being developed on
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To create a gem, all that is required is a gemspec It s possible to create this file manually by using the syntax on the Gem::Specification documentation page (http://rubygemsrubyforgeorg/rubygems-update/Gem/Specificationhtml) However, it can get a bit time-consuming and can cause problems if you forget to update the gemspec with new files An easier way to get started creating a RubyGems gem is to use a generator such as Jeweler
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Jeweler (http://githubcom/technicalpickles/jeweler), created by Josh Nichols, is a generator for starting new gems It has a convenient command-line interface for starting new gems and comes with built-in rake tasks to handle things like generating the gemspec, building the gem, and pushing to RubyGems (http://rubygemsorg) For internal libraries, you ll probably want to skip the last part, but the other conveniences of the library make it worth using even for private gems This chapter focuses on building out an example from the social feed reader application First, you create a library for the entry service Remember that this service has methods for getting the information on feed entries, given a list of IDs A larger example might have the service also return entries given a source (such as a feed URL or an ID), but the single list of IDs is enough to highlight the important parts The second library is for accessing the vote service created in 5, Implementing Services The third library is for accessing the reading list for a user The simple example in this chapter only returns a list of entry IDs, given the user email A more complete example would include getting a list of subscriptions and adding and removing feeds from
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