为什么我需要在 Ruby on Rails 应用程序中包装线程？

Question

In my RoR app, I'm writing an API in which I need to call multiple upstream APIs, so I'm planning to call them in parallel to save time. I want to follow best practices when implementing multi-threaded logic in ruby-on-rails applications.

The RoR guide states clearly that we need to wrap our code but it didn't explain why it is important.

From ruby-on-rails guidelines :

Each thread should be wrapped before it runs application code, so if your application manually delegates work to other threads, such as via Thread.new or Concurrent Ruby features that use thread pools, you should immediately wrap the block

• My App runs Rails version 4.
• Number of upstream API calls in a single request ranges from 3 to 30
• I checked out this similar SO post , but it doesn't mention anything about wrapping threaded code.

Answer 1

Wrapping the thread on the executor makes sure that you won't have any problem with unloaded constants... You won't see errors like

Unable to autoload constant User, expected ../user.rb to define it (LoadError).