A simple class method to create immutable attributes in the style or attr_attributes, attr_reader, attr_writer, etc.

JRuby

Install the gem:

gem install attr_immutable

Run the code:

class ImmutableFoo
  attr_immutable :foo

end

foo = Foo.new
foo.foo = 'Set the value'
foo.foo = 'Oops! This will raise an error' # <= This will raise a runtime error.

SimpleWorkQueue is a fork of WorkQueue by Miguel Fonseca. SimpleWorkQueue removes the time out and bounded task queue. The timeout created issues under the concurrency implementation in JRuby. The time out mechanism was replaced using a non-blocking queue from the java.util.concurrent library. If a worker thread attempts to remove a task from the task queue and it is empty it will exit the worker thread.