Working Effectively with Legacy Code by Michael Feathers

By Michael Feathers

Get extra from your legacy structures: extra functionality, performance, reliability, and manageability

Is your code effortless to alter? are you able to get approximately immediate suggestions for those who do swap it? Do you recognize it? If the reply to any of those questions is not any, you will have legacy code, and it really is draining money and time clear of your improvement efforts.

In this ebook, Michael Feathers bargains start-to-finish options for operating extra successfully with huge, untested legacy code bases. This ebook attracts on fabric Michael created for his popular item Mentor seminars: recommendations Michael has utilized in mentoring to assist thousands of builders, technical managers, and testers deliver their legacy structures less than keep an eye on.

The issues lined include
* figuring out the mechanics of software program switch: including beneficial properties, solving insects, enhancing layout, optimizing performance
* Getting legacy code right into a try out harness
* Writing assessments that guard you opposed to introducing new problems
* strategies that may be used with any language or platform?with examples in Java, C++, C, and C#
* correctly determining the place code alterations have to be made
* dealing with legacy platforms that aren't object-oriented
* dealing with purposes that don't appear to have any structure

This publication additionally features a catalog of twenty-four dependency-breaking suggestions that assist you paintings with software parts in isolation and make more secure changes.

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It returns a hash with the attribute names as keys and their respective values. Implementing it in our model requires two steps: first we need to track all attributes defined by the developer, and then we need to use them to create an attributes hash. present? end end end To allow our MailForm::Base to be inheritable, our implementation uses the class_attribute method from Active Support to define the array that holds our attributes list. The class_attribute implementation ensures a child class has the same values as the parent but guarantees that setting a value in the child won’t propagate to the parent.

Boolean :partial, :default => false And now we are ready to run our migrations: rake db:migrate So far, no surprises. Next, let’s create a template resolver, which will use the SqlTemplate model to read templates from the database and expose them according to the Resolver API described next. The Resolver API The Resolver API is composed of a single method, called find_all, which should return an array of templates and has the following signature: def find_all(name, prefix, partial, details, cache_key) For an HTML request at the index action of a UsersController, those arguments are exactly as shown here: find_all("index", "users", false, { :formats => [:html], :locale => [:en, :en], :handlers => [:erb, :builder, :rjs] }, nil) For this simple request, we can see that name maps to the action name, while prefix refers to the controller name.

With autoload in place, our first test passes. We have a simple model with attributes, but so far, we haven’t used Active Model’s goodness. Let’s do that now. Adding Attribute Methods ActiveModel::AttributeMethods is a module that tracks all defined attri- butes, allowing us to add a common behavior to all of them. Let’s use it to dynamically define clear_ methods for all attributes. If our fixture has both name and email attributes, we can use ActiveModel::AttributeMethods to define clear_name and clear_email without duplicating code.

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