Asynchronous workflow pattern

The asynchronous workflow pattern, also known as the publish-subscribe pattern, is an architecture pattern which is typically used to asynchronously perform resource intensive and time consuming tasks. To separate the request from the task itself we can use a queue where the sender puts messages that another service can pick up.
This pattern is a subset of the CQRS (Command-Query Responsibility Segregation) pattern. CQRS defines a clear separation of a command and query model [MF-CQRS], while the asynchronous workflow pattern only defines a command model without caring how the result of a command is being read.
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