Cloud Intermediate

Serverless Patterns — Architektonické vzory¶

ServerlessArchitekturaEvent-DrivenPatterns 5 min read

Fan-out, Step Functions orchestrace, CQRS a event sourcing na serverless.

Fan-Out / Fan-In¶

SNS Topic: order-events
  ├── SQS: billing → Lambda: process-billing
  ├── SQS: inventory → Lambda: update-inventory
  ├── SQS: email → Lambda: send-confirmation
  └── SQS: analytics → Lambda: track-analytics

Každý processor nezávislý, SQS buffering + retry.

Step Functions¶

{
  "StartAt": "Validate",
  "States": {
    "Validate": {"Type":"Task","Resource":"arn:...:validate","Next":"Pay",
      "Catch":[{"ErrorEquals":["ValidationError"],"Next":"Failed"}]},
    "Pay": {"Type":"Task","Resource":"arn:...:payment","Next":"Ship",
      "Retry":[{"ErrorEquals":["Timeout"],"MaxAttempts":3}]},
    "Ship": {"Type":"Task","Resource":"arn:...:ship","End":true},
    "Failed": {"Type":"Fail"}
  }
}

Serverless CQRS¶

• Command: API GW → Lambda → DynamoDB (writes)
• Query: API GW → Lambda → ElastiCache (reads)
• Sync: DynamoDB Streams → Lambda → update read model

Summary¶

Serverless = event-driven thinking. Fan-out, Step Functions, CQRS pro škálovatelnost.

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