Dp Event Driven
DodaTech
1 min read
In this tutorial, you'll learn about How to Fix Event. We cover key concepts, practical examples, and best practices.
Fix event-driven architecture errors when synchronous blocking calls tightly couple services.
Quick Fix
Wrong
class OrderService:
def place(self,order):
inv=InventoryService()
if not inv.check(order): raise Exception('Out of stock')
email=EmailService()
email.send_confirmation(order)
audit=AuditService()
audit.log(order)
return 'done'
Synchronous calls. If inventory service is down, order placement fails. Services tightly coupled.
Right
from abc import ABC,abstractmethod
class EventBus:
def __init__(self): self.handlers={}
def subscribe(self,event_type,handler): self.handlers.setdefault(event_type,[]).append(handler)
def publish(self,event):
for h in self.handlers.get(type(event).__name__,[]):
h.handle(event)
class OrderPlaced:
def __init__(self,order): self.order=order
class InventoryHandler:
def handle(self,event): print(f'Check stock for {event.order}')
class EmailHandler:
def handle(self,event): print(f'Send confirmation for {event.order}')
bus=EventBus(); bus.subscribe('OrderPlaced',InventoryHandler()); bus.subscribe('OrderPlaced',EmailHandler())
bus.publish(OrderPlaced('order123'))
Services decoupled. Event bus coordinates. New handlers subscribe without changing publisher.
Prevention
Event-driven: services communicate via events. Loose coupling, scalability, async processing.
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