Signature

Dynamic Partial Join Pattern

Classification

Multi-instance Pattern

Intent

The number of multiple instances to be created is not determined until the final instance of the multiple instances has been completed and all the instances then get synchronized. This pattern is an extension to the multiple instances without prior runtime knowledge pattern; however, in this pattern, a condition is evaluated that clogs further instances from being created.

Motivation

The determination of the number of instances is not performed until the final instance. A completion condition can be specified, which is evaluated each time an instance of the task completes. Once the completion condition evaluates to true, the next task in the process is triggered. Subsequent completions of the remaining task instances are cancelled and no new instances can be created.