Start a Rails app with conditional features enabled.

startup.rake

# Needed to load an application without enabling a certain feature unless I explicitly wanted it.
# The use case was not wanting listeners to load unless the server was starting up; otherwise
# running rake or any of the rails aliases would fire up the listener which would block the thread.

# To complete this thought, check for the value of the environment variable in an initializer, e.g.
#
# config/initializers/listeners.rb
# if ENV['WITH_LISTENERS']
#  Rails.logger.info "Starting listeners..."
#  Listener.start(:customer)
# end

namespace :startup do

  task :with_listeners => :environment do
    puts "Starting application with listeners enabled"
    system "WITH_LISTENERS=true rails s -p 3010"
  end

  task :without_listeners => :environment do
    puts "Starting application with listeners disabled"
    system "WITH_LISTENERS=false rails s -p 3010"
  end

end