An Introduction to Dart Code and Isolate

An Introduction to Dart Code and Isolate

Any Dart code is executed in Isolate. Isolate is an isolated environment, inside which there is memory allocated to it and its EventLoop.

Dart was originally a single-threaded programming language. However, many have heard of Isolate. They are often asked about in Flutter developer interviews. For this reason alone, it is worth studying this topic in a little more detail.

Today we will figure out what they are and how they can help us create responsive interfaces that work with 60 fps.

What is Isolate?

Any Dart code is executed in Isolate. Isolate is an isolated environment, inside which there is memory allocated to it and its EventLoop. Each Isolate is single-threaded and can only manage the memory and EventLoop allocated for it. You cannot control the memory of another Isolate.

How do different Isolates communicate?

Communication between Isolates occurs through the transfer of messages between ports.

How do I start using Isolates in my applications?

So, to use this powerful tool, we need to include the Dart library: isolates

If we look at the documentation, we will see a rather small API that gives us the following main classes to work with:

  • Capability - A non-counterfeit object that returns the same when passing through other isolates. That is, we can receive this object in no other way, except by sending some object to the isolate and receiving it back.
  • Isolate - Isolate or isolated context of the execution of Dart code.
  • RecievePort is what allows our isolates to communicate with each other through messaging. Inherits the Stream interface. It should be noted that RecievePort is a Single subscription stream, which means it can only have one listener. It has a sendPort getter that returns an instance of the SendPort class, which is discussed later.
  • SendPort is a class that can send messages to RecievePort. SendPort inherits the Capability interface.

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