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Showing posts from February, 2017

Spring DI with different styles

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Spring as a dependency injection (DI) framework allows us to define our application components' dependency tree in three different ways: XML Annotation Java Config I've written a simple app, bookstore, with the three styles and they're available in the following repository. You can take a look and see how each style would look like. It also has a version that uses no Spring beans for comparison. https://github.com/ryu1kn/spring--working-with-beans Different styles have different pros/cons. Spring lets you mix the styles; so you can change it as you go. Here is my observations on each style. XML-based configuration Pros Weak/loose coupling with Spring framework in your app code. Good for keeping the option of removing Spring later Class dependency information is centralised. Fine-grained control on the dependency definition. Changing only the dependency information doesn't require the recompilation of your app code. Cons Unless you have a good IDE
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Terraform

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Organise your infrastructure with terraform How to create reusable infrastructure with Terraform modules How to manage Terraform state But HIL is somehow limited Support for nested maps in variables #2114 Type system to support list and map element types Intermediate variables (OR: add interpolation support to input variables) Use null_data_source Can't create an output map
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Golang way

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I want to convert a list of type T1 to a list of type T2. Do I convert its element one-by-one? Yes, simply iterate over the whole list. cf. Type converting slices of interfaces in go Does a Go project needs to be under GOPATH ? I wrote a tool in Go and want to check it into an exising repository, but don't want to put the repo under GOPATH as it's mostly written in non-Go languages Add an appropriate place to GOPATH every time you run go commands. GOPATH for a project written in several languages (for example Go and Python)? AWS SDK for Go exposes struct s but not many interface s hence hard to mock in unit tests. Define interfaces as you need and use AWS SDK through them. cf. Discussion: How should you unit test code which uses the aws-sdk-go Where is list manipulation functions like filter , map , reduce , ...? Use for loop. cf. Map, reduce and filter in Go? , Writing type parametric functions in Go Dereferencing a nil pointer doesn't cause an error
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