Micro-Services Mechano

Mechano Approach and Areas

01-What Is Mecchano?

Mecchano model represents the collaboration between set of micro-services design patterns to achieve specific non-functional requirements, which you are looking to achieve within your solution, so, no one-only design pattern will be used, but collaborative work will take place.

02-Configuration Mechano

1. External Configuration

• Concept: Store application configuration outside the code (files, environment variables, or config servers).

• Use Case: Multi-environment deployments, microservices, CI/CD pipelines.

• Best Practices:

  • Keep secrets separate (use vaults or KMS).

  • Use consistent formats (YAML, JSON, TOML).

  • Version control non-sensitive configs.

2. Realtime Reconfiguration

• Concept: Ability to update configuration at runtime without restarting the service.
  
  

• Use Case: Dynamic feature toggles, tuning parameters in production, traffic management.
  
  

• Best Practices:

  • Validate changes before applying.

  • Ensure atomicity and thread-safety.

  • Audit configuration changes for rollback.
    
    

3. Publisher-Subscriber (Pub/Sub) for Config

• Concept: Config changes are broadcast to interested services/components via messaging.

• Use Case: Large-scale distributed systems where multiple services need to react to config changes instantly.

• Best Practices:

  • Decouple producers and consumers.

  • Ensure idempotency for repeated events.

  • Monitor propagation latency and consistency.

Performance Mechano

1. Indexed Table

• Concept: Add indexes to database tables on frequently queried columns to speed up lookups.

• Use Case: Large tables where searches, joins, or range queries are common.

• Best Practices:

  • Index columns used in WHERE, JOIN, ORDER BY.

  • Avoid excessive indexing (slows writes).

  • Use composite indexes carefully when multiple columns are queried together.
    
    

2. Cache-Aside (Lazy & Eager Loading)

• Concept: Application checks cache first; if miss, fetch from DB, then populate cache.

• Use Case: Frequently read but rarely updated data.
  
  

• Best Practices:

  • Set TTLs to avoid stale data.

  • Handle cache invalidation carefully.

  • Consider write-through if updates are frequent.

3. Materialized View

• Concept: Precompute and store the results of expensive queries for fast access.

• Use Case: Complex aggregations, reporting dashboards, OLAP workloads.
  
  

• Best Practices:

  • Refresh periodically or on-demand depending on data volatility.

  • Monitor storage cost and query patterns.

  • Use incremental refresh if supported.

• Standards/References:

  • SQL standard: CREATE MATERIALIZED VIEW; Oracle, PostgreSQL, SQL Server implementations.

Resilience Mechano

Retry Pattern: Automatically re-attempts a failed operation due to transient issues (e.g., network glitches), improving reliability without manual intervention. It should include backoff strategies to avoid overwhelming dependent services.

Circuit Breaker: Prevents repeated calls to a failing service by “opening the circuit” after a threshold, allowing the system to recover and protecting overall stability. It switches between closed, open, and half-open states.

Scheduler Agent: Executes tasks asynchronously or at predefined intervals, decoupling time-dependent operations from real-time flows. It improves resilience by handling retries, delayed processing, and workload smoothing.

Transaction Compensation: Handles failures in distributed transactions by executing compensating actions to undo completed steps, ensuring eventual consistency instead of strict rollback across services.

Security Mechano:

1. Federated Identity

• Concept: Allows users to authenticate across multiple systems using a single identity provider (IdP).

• Use Case: Single Sign-On (SSO) for enterprise apps or third-party services.

• Best Practices:

  • Use standards like SAML 2.0, OAuth 2.0, or OpenID Connect.

  • Minimize user credentials stored locally.

  • Implement proper token validation and expiration.

2. Valet Key

• Concept: Issue time-limited, scoped tokens granting access to specific resources without exposing full credentials.

• Use Case: Securely allow clients or apps to access storage (e.g., cloud blobs) for a short time.
  
  

• Best Practices:

  • Limit scope (read/write) and duration.

  • Revoke or expire keys automatically.

  • Use secure transport (HTTPS) for token delivery.

UX Mechano:

Consists of the previously mentioned configuration, performance, and resiliency design patterns, moreover the security design patterns as following:

1. Configuration design patterns: enhance maintainability and response to change. 

2. Performance design patterns: enhance response time, and time to finish the service.

3. Resiliency design patterns: Enhance stability, and business continuity

4. Security design patterns: Enhance solution security to meet CIA security principles