module ActiveJob::Exceptions::ClassMethods

end
end
# Might raise Net::OpenTimeout or Timeout::Error when the remote service is down
# Might raise ActiveRecord::Deadlocked when a local db deadlock is detected
# Might raise CustomAppException, AnotherCustomAppException, or YetAnotherCustomAppException for something domain specific
def perform(*args)

end
ExceptionNotifier.caught(error)
retry_on(YetAnotherCustomAppException) do |job, error|

# retry_on Timeout::Error, wait: :exponentially_longer, attempts: 10
# retry_on Net::ReadTimeout, wait: 5.seconds, jitter: 0.30, attempts: 10
# retry_on Net::OpenTimeout, wait: :exponentially_longer, attempts: 10
# To retry at most 10 times for each individual exception:
retry_on Net::OpenTimeout, Timeout::Error, wait: :exponentially_longer, attempts: 10 # retries at most 10 times for Net::OpenTimeout and Timeout::Error combined
retry_on ActiveRecord::Deadlocked, wait: 5.seconds, attempts: 3

retry_on AnotherCustomAppException, wait: ->(executions) { executions * 2 }
retry_on CustomAppException # defaults to ~3s wait, 5 attempts
class RemoteServiceJob < ActiveJob::Base

==== Examples

* :jitter - A random delay of wait time used when calculating backoff. The default is 15% (0.15) which represents the upper bound of possible wait time (expressed as a percentage)
* :priority - Re-enqueues the job with a different priority
* :queue - Re-enqueues the job on a different queue
* :attempts - Re-enqueues the job the specified number of times (default: 5 attempts)
(first wait ~3s, then ~18s, then ~83s, etc)
:exponentially_longer, which applies the wait algorithm of ((executions**4) + (Kernel.rand * (executions**4) * jitter)) + 2
as a computing proc that takes the number of executions so far as an argument, or as a symbol reference of
* :wait - Re-enqueues the job with a delay specified either in seconds (default: 3 seconds),
==== Options

the exception bubble up. This block is yielded with the job instance as the first and the error instance as the second parameter.
You can also pass a block that'll be invoked if the retry attempts fail for custom logic rather than letting

holding queue for inspection.
bubble up to the underlying queuing system, which may have its own retry mechanism or place it in a
If the exception keeps getting raised beyond the specified number of attempts, the exception is allowed to
Catch the exception and reschedule job for re-execution after so many seconds, for a specific number of attempts.

def retry_on(*exceptions, wait: 3.seconds, attempts: 5, queue: nil, priority: nil, jitter: JITTER_DEFAULT)
  rescue_from(*exceptions) do |error|
    executions = executions_for(exceptions)
    if executions < attempts
      retry_job wait: determine_delay(seconds_or_duration_or_algorithm: wait, executions: executions, jitter: jitter), queue: queue, priority: priority, error: error
    else
      if block_given?
        instrument :retry_stopped, error: error do
          yield self, error
        end
      else
        instrument :retry_stopped, error: error
        raise error
      end
    end
  end
end