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actioncable-next

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Next-gen Action Cable implementation

// repository documentation

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# Action Cable Next

This gem provides the functionality of the _server adapterization_ PR: [rails/rails#50979](https://github.com/rails/rails/pull/50979).

See the PR description for more information on the purpose of this refactoring.

There are also some additional improvements added on top of the PR (see below).

## Usage

Add this line to your application's Gemfile **before Rails or Action Cable**:

```ruby
gem "actioncable-next"

gem "rails", ">= 7.0"
```

Then, you can use Action Cable as before. Under the hood, the new implementation would be used.

### RSpec support

This gem also includes the corresponding patch for RSpec Rails (see [PR](https://github.com/palkan/rspec-rails/pull/1)). You MUST activate it explicitly
by adding the following line to your `spec/rails_helper.rb`:

```ruby
# after rspec-rails is loaded
require "rspec/rails"
require "action_cable/next/rspec"
```

### New features

#### `ActionCable.server.config.fastlane_broadcasts_enabled = true`

This option allows you to enable the _fast lane_ for broadcasting messages. When enabled, messages sent via `ActionCable.server.broadcast` are only decoded-encoded from/to JSON once per channel identifier and not for every connected client. This significantly reduces the broadcasting latency (up to 2x faster).

#### `Connection#broadcast`

You can now broadcast message from connection or channel instances using the connection `#broadcast` method. For example:

```ruby
class TestChannel < ActionCable::Channel::Base
  def notify_all(data)
    connection.broadcast("testing-#{test_id}", data)
  end
end
```

The purpose of this interface is to avoid direct usage of `server` or `ActionCable.server` in channels code.

actioncable-next

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