Description

Fan-out broadcasts a message to multiple processors. Fan-in aggregates results from parallel executions.

Where to use

• Parallel processing.
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• Batch jobs.

Real World Example

An Order is placed (Fan-out). Inventory, Email, and Fraud services process it in parallel. Once all 3 reply (Fan-in), the order is confirmed.

Code Example

class Fan-out/Fan-in:
    def __init__(self):
        pass

    def execute(self):
        print('Executing Fan-out / Fan-in')