External resource communication sample

[szaluzhskiy]

It will be very useful to have a sample of workflow where communicating with external resource is done.

Use case
External resource should be called from Workflow\Activity and can provide answer asynchronously but after very long period of time 1 day, 2 days.... 1 year.

• Cadence Workflow should not DDos external resource.
• Cadence Workflow fulfils SLA of external resource - e.g not more then n requests per m seconds to endpoint\service of external resource