Gain insights into data processing and concurrency in Elixir. Explore GenServer, GenStage, Flow, and Broadway to enhance performance, set up pipelines, and handle increased workloads efficiently.

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Most engineers don’t think that concurrency is distinct from programming. Data processing includes transforming information in some way, like reporting, data aggregation, or analytics. On the other hand, concurrency involves significantly improving performance.

This course is designed to help you navigate the world of concurrency tools available in the Elixir ecosystem. You’ll explore popular modules and libraries like GenServer, GenStage, Flow, and Broadway. You’ll be able to ingest data, set up pipelines, and run concurrent processes with Elixir.

By the end of the course, you’ll have a wide range of new techniques to simplify your product, improve code performance, and make your application more resilient to increased workloads.

Concurrent Data Processing in Elixir

# The `handle_cast` callback function

Now, let’s implement sending emails using `handle_cast/2`. The arguments given to `handle_cast/2` are just a term for the message and the state. We pattern match on the message `{:send, email}`:

```Elixir
def handle_cast({:send, email}, state) do 
    # to do...
end
```
## Return values

Most of the times we will return one of the following tuples:

* `{:noreply, new_state}`

* `{:noreply, new_state, {:continue, term}}`

* `{:stop, reason, new_state}`

To refresh our memory, this is how the `Sender.send_email/1` function works:

```Elixir
def send_email(email) do
   Process.sleep(3000)
   IO.puts("Email to #{email} sent")
   {:ok, "email_sent"}
end
```

Let’s call the `send_email/1` function from our `handle_cast/2` callback and update the process state when this happens:

Learn how the GenServer uses handle_cast to interact with processes.

Getting Started

Easy Concurrency with the Task Module

Long-Running Processes Using GenServer

Data Processing Pipelines with GenStage

Process Collections with Flow

Data Ingestion Pipelines with Broadway

Concluding the Course

Genserver Callbacks: handle_cast

The `handle_cast` callback function

Genserver Callbacks: handle_cast

The handle_cast callback function

The `handle_cast` callback function