Low Level Design Roadmap
55 sections • 909 topics
- 1. Understanding Encapsulation
- Example: Encapsulated balance
- 2. Understanding Abstraction
- Example: Payment abstraction
- 3. Understanding Inheritance
- 4. Understanding Polymorphism
- Example: Subtype polymorphism
- 5. Understanding Composition over Inheritance
- Example: Compose, don't extend
- 6. Understanding Coupling and Cohesion
- 7. Understanding Information Hiding
- 8. Understanding Separation of Concerns
- 9. Understanding Law of Demeter
- Example: Tell, don't ask
- 10. Understanding DRY Principle
- 11. Understanding YAGNI Principle
- 12. Understanding KISS Principle
- 1. Understanding Single Responsibility Principle
- Example: Split responsibilities
- 2. Understanding Open-Closed Principle
- Example: Strategy keeps it closed
- 3. Understanding Liskov Substitution Principle
- 4. Understanding Interface Segregation Principle
- Example: Role interfaces
- 5. Understanding Dependency Inversion Principle
- Example: Inverted dependency
- 6. Identifying SRP Violations
- 7. Applying SOLID in Domain Models
- 8. Applying SOLID in Service Layer Design
- 9. Balancing SOLID with Pragmatism
- Apply Strictly When
- Relax When
- 10. Refactoring to SOLID
- Refactor Sequence
- 11. Understanding SOLID Trade-offs
- 12. Implementing SOLID in Legacy Code
- 1. Understanding Pure Functions
- Example: Pure vs impure
- 2. Understanding Immutability
- 3. Understanding Higher-Order Functions
- Example: Function as parameter
- 4. Understanding Function Composition
- Example: Compose pipeline
- 5. Understanding Referential Transparency
- 6. Understanding First-Class Functions
- 7. Implementing Map, Filter, Reduce Patterns
- Example: MFR pipeline
- 8. Understanding Currying and Partial Application
- Example: Curry in Java
- 9. Understanding Closures
- 10. Implementing Monads
- Example: flatMap chain
- 11. Understanding Lazy Evaluation
- 12. Avoiding Side Effects
- 1. Defining Class Responsibilities
- 2. Implementing Constructors
- Example: Validating constructor
- 3. Implementing Encapsulation
- 4. Designing Method Signatures
- 5. Implementing Static vs Instance Members
- 6. Designing Immutable Classes
- Example: Record as immutable
- 7. Implementing Utility Classes
- 8. Implementing Value Objects
- 9. Implementing Entities
- 10. Understanding Composition vs Aggregation
- 11. Implementing Data Classes
- 12. Designing Object Lifecycle
- 1. Designing Interface Contracts
- 2. Defining Abstract Classes
- 3. Understanding Interface vs Abstract Class
- 4. Implementing Multiple Interfaces (composition)
- Example: Combine roles
- 5. Designing Marker Interfaces
- 6. Implementing Default Methods
- Example: Default convenience
- 7. Implementing Functional Interfaces
- 8. Designing API Contracts
- 9. Using Interface Segregation
- Example: Split a fat interface
- 10. Implementing Dependency Abstraction
- 11. Designing Sealed Interfaces
- Example: Closed hierarchy
- 12. Implementing Interface Evolution
- 1. Designing Package Structure
- 2. Implementing Layered Architecture
- 3. Implementing Module Boundaries
- 4. Organizing Code by Features
- Example: Feature packages
- 5. Organizing Code by Layers
- Example: Layer packages
- 6. Implementing Constants Management
- 7. Implementing Exception Hierarchy
- 8. Implementing Utility Packages
- 9. Implementing Code Documentation
- 10. Implementing File Organization
- 11. Designing Namespace Structure
- 12. Implementing Module Dependencies
- 1. Implementing Singleton Pattern
- Example: Enum singleton
- 2. Implementing Factory Method Pattern
- Example: Subclass decides type
- 3. Implementing Abstract Factory Pattern
- Example: Family of products
- 4. Implementing Builder Pattern
- Example: Fluent builder
- 5. Implementing Prototype Pattern
- 6. Implementing Factory Pattern
- Example: Simple factory
- 7. Implementing Simple Factory
- 8. Using Static Factory Methods
- 9. Choosing Between Factory Patterns
- 10. Implementing Object Pool Pattern
- 11. Implementing Registry Pattern
- Example: Type registry
- 12. Implementing Multiton Pattern
- 13. Implementing Dependency Injection Pattern
- 14. Understanding Dependency Injection
- 15. Using Service Locator Pattern
- 16. Understanding IoC Containers
- 17. Using Service Containers
- 18. Understanding Thread-Safe Singleton
- 19. Using Double-Checked Locking
- Example: Correct DCL
- 20. Using Initialization-on-Demand Holder
- Example: Holder idiom
- 21. Implementing Lazy Initialization
- 22. Using Lazy<T> for Lazy Initialization
- Example: Memoized supplier
- 23. Using Functional Options
- Example: Configurer pattern
- 24. Using Structs for Simple Factories
- 25. Using Class Methods as Factories
- Example: Named static creators
- 26. Using Companion Objects for Factories
- 27. Using Module Mixins for Object Creation
- 1. Implementing Adapter Pattern
- Example: Adapt incompatible interface
- 2. Implementing Bridge Pattern
- Example: Notification × Channel
- 3. Implementing Composite Pattern
- Example: Tree of components
- 4. Implementing Decorator Pattern
- Example: Wrap and add behavior
- 5. Implementing Facade Pattern
- Example: Order facade
- 6. Implementing Flyweight Pattern
- 7. Implementing Proxy Pattern
- 8. Implementing Repository Pattern
- Example: Domain-owned port
- 9. Implementing Data Mapper Pattern
- 10. Implementing Active Record Pattern
- 11. Implementing Unit of Work Pattern
- 12. Implementing Module Pattern
- 13. Implementing Delegation Pattern
- Example: Forward to inner
- 14. Understanding Wrapper Pattern
- 15. Implementing Private Class Data Pattern
- 16. Understanding Adapter vs Decorator vs Proxy
- 17. Creating Lazy Initialization Proxy
- Example: Virtual proxy
- 18. Implementing Virtual Proxy
- 19. Using java.lang.reflect.Proxy
- Example: Dynamic proxy
- 20. Using Class Delegation
- 21. Using Embedding for Delegation
- 22. Using Extension Methods
- 23. Using Extension Methods as Decorators
- 24. Using Module Mixins for Decoration
- 25. Using SimpleDelegator and DelegateClass
- 1. Implementing Strategy Pattern
- Example: Pluggable algorithm
- 2. Implementing Observer Pattern
- Example: Publish/subscribe
- 3. Implementing Command Pattern
- Example: Encapsulate request
- 4. Implementing Template Method Pattern
- Example: Skeleton + hooks
- 5. Implementing Iterator Pattern
- 6. Implementing Chain of Responsibility Pattern
- Example: Pipeline of handlers
- 7. Implementing State Pattern
- Example: State-driven order
- 8. Implementing Visitor Pattern
- 9. Implementing Mediator Pattern
- 10. Implementing Memento Pattern
- Example: Snapshot + restore
- 11. Implementing Null Object Pattern
- Example: No-op default
- 12. Implementing Specification Pattern
- Example: Composable predicate
- 13. Implementing State Pattern with Sealed Classes
- Example: Exhaustive states
- 1. Implementing Value Objects
- Example: Email value object
- 2. Implementing Entities
- 3. Implementing Aggregates
- 4. Implementing Aggregate Roots
- Example: Root enforces invariants
- 5. Implementing Domain Services
- Example: Pricing domain service
- 6. Implementing Domain Events
- 7. Designing Rich Domain Models
- Rich Model
- Anemic Model
- 8. Understanding Anemic vs Rich Domain Models
- 9. Defining Bounded Contexts
- 10. Modeling Business Rules
- 11. Designing Entity Relationships
- 12. Implementing Factories for Aggregates
- Example: Aggregate factory
- 1. Implementing Constructor Injection
- Example: Constructor injection
- 2. Implementing Setter Injection
- 3. Understanding Field Injection
- 4. Implementing Component Scanning
- 5. Implementing Bean Lifecycle
- 6. Implementing Scope Management
- 7. Implementing Qualifier Annotations
- Example: Disambiguate beans
- 8. Implementing Conditional Beans
- 9. Resolving Circular Dependencies
- 10. Implementing Primary Beans
- Example: Default among multiple
- 11. Implementing Custom Scopes
- 12. Understanding Dependency Injection Containers
- 1. Creating Request DTOs
- Example: Request record with validation
- 2. Creating Response DTOs
- 3. Implementing DTO Mapping
- 4. Designing Nested DTOs
- Example: Nested response
- 5. Using Validation Annotations
- 6. Implementing Pagination DTOs
- Example: Page response
- 7. Implementing Filter DTOs
- Example: Search filter
- 8. Understanding DTOs vs Domain Models
- 9. Implementing Versioned DTOs
- 10. Handling Null Values
- 11. Implementing Command DTOs
- 12. Implementing Query DTOs
- 1. Defining Service Responsibilities
- 2. Implementing Service Interfaces
- Example: Interface + impl
- 3. Implementing Service Transaction Boundaries
- 4. Implementing Service Composition
- Example: Compose services
- 5. Implementing Service Dependencies
- 6. Implementing Service Error Handling
- 7. Implementing Service Input Validation
- 8. Implementing Service Output Transformation
- 9. Designing Service Granularity
- 10. Understanding Service vs Repository Separation
- 11. Implementing Application Services
- 12. Implementing Domain Services
- 1. Implementing Repository Interface
- Example: Domain repository contract
- 2. Implementing Generic Repository
- Example: Spring Data style
- 3. Implementing Specification Pattern
- Example: Spring Data JPA Specification
- 4. Implementing Unit of Work Pattern
- 5. Implementing Query Object Pattern
- 6. Implementing Data Access Layer Abstraction
- 7. Implementing Repository Methods
- 8. Implementing Pagination in Repository
- Example: Paged query
- 9. Implementing Repository Exception Handling
- 10. Implementing Custom Repository Implementations
- Example: Spring Data custom impl
- 11. Implementing Repository Factory
- 12. Implementing Read vs Write Repository
- Write Repository
- Read Repository
- 1. Implementing Input Validation
- Example: Trigger validation in controller
- 2. Implementing Business Rule Validation
- Example: Enforce in domain
- 3. Using Validation Annotations
- 4. Implementing Custom Validators
- Example: Custom annotation
- 5. Implementing Validation Error Messages
- 6. Implementing Cross-Field Validation
- Example: Class-level constraint
- 7. Implementing Validation Groups
- 8. Implementing Input Sanitization
- 9. Implementing Schema Validation
- 10. Understanding Fail-Fast vs Collect-All Validation
- 11. Implementing Fluent Validation
- Example: Fluent rules
- 12. Implementing Domain Model Validation
- 1. Normalizing Database Tables
- 2. Denormalizing for Performance
- 3. Designing Primary Keys
- 4. Implementing Foreign Key Relationships
- 5. Designing Indexes
- 6. Implementing Soft Deletes
- Example: Soft-delete column
- 7. Implementing Audit Columns
- 8. Designing Partitioning Strategies
- 9. Using Junction Tables
- Example: M:N junction
- 10. Implementing Polymorphic Associations
- 11. Designing Column Types
- 12. Implementing Database Constraints
- 1. Implementing Entity Mappings
- Example: JPA entity
- 2. Implementing Relationships
- 3. Implementing Fetch Strategies
- 4. Implementing Cascade Operations
- 5. Implementing Inheritance Strategies
- 6. Implementing Embedded Objects
- Example: Embeddable value object
- 7. Implementing Entity Listeners
- 8. Implementing Named Queries
- Example: Named JPQL
- 9. Implementing Custom Type Converters
- Example: AttributeConverter
- 10. Implementing ID Generation Strategies
- 11. Implementing Composite Primary Keys
- Example: @EmbeddedId
- 12. Implementing Optimistic Locking
- Example: @Version
- 1. Implementing Schema Versioning
- 2. Implementing Migration Scripts
- Example: Flyway migration
- 3. Implementing Rollback Scripts
- 4. Implementing Baseline Migration
- 5. Implementing Repeatable Migrations
- 6. Implementing Callback Handlers
- 7. Implementing Migration Validation
- 8. Implementing Out-of-Order Migrations
- 9. Implementing Placeholder Replacement
- Example: Per-env placeholder
- 10. Implementing Migration Testing
- 11. Implementing Data Migrations
- 12. Implementing Zero-Downtime Migrations
- Expand-Contract Pattern
- 1. Writing Efficient Queries
- 2. Using Query Hints
- 3. Implementing Batch Fetching
- 4. Implementing Query Result Caching
- 5. Implementing N+1 Query Prevention
- Example: JOIN FETCH
- 6. Implementing Projection Queries
- Example: DTO projection
- 7. Implementing Native Queries
- 8. Analyzing Query Execution Plans
- 9. Optimizing Subqueries
- 10. Using Criteria API
- Example: Type-safe Criteria
- 11. Implementing Query Pagination
- 12. Implementing Query Indexing Strategy
- 1. Understanding ACID Properties
- 2. Implementing Declarative Transactions
- Example: @Transactional
- 3. Implementing Programmatic Transactions
- Example: TransactionTemplate
- 4. Designing Transaction Boundaries
- 5. Understanding Transaction Isolation Levels
- 6. Implementing Transaction Propagation
- 7. Implementing Optimistic Locking
- 8. Implementing Pessimistic Locking
- Example: SELECT ... FOR UPDATE
- 9. Handling Transaction Rollback
- 10. Implementing Read-Only Transactions
- Example: read-only flag
- 11. Understanding Distributed Transactions
- 12. Implementing Savepoints
- Example: Nested rollback
- 1. Defining Resource-Based URLs
- 2. Using HTTP Methods Correctly
- 3. Implementing API Versioning
- 4. Implementing HATEOAS
- Example: HAL response
- 5. Defining Request/Response Contracts
- 6. Handling Query Parameters
- 7. Designing Error Responses
- Example: RFC 7807 Problem Details
- 8. Implementing Content Negotiation
- 9. Designing Idempotent Operations
- 10. Using HTTP Status Codes Appropriately
- 11. Implementing Partial Responses
- 12. Designing Bulk Operations Endpoints
- Example: Bulk endpoint
- 1. Implementing URL Path Versioning
- Example: Versioned controller
- 2. Implementing Header-Based Versioning
- 3. Implementing Query Parameter Versioning
- 4. Implementing Content Negotiation Versioning
- 5. Implementing Versioned Controllers
- 6. Implementing Versioned DTOs
- Example: Version packages
- 7. Implementing Backward Compatibility Logic
- 8. Implementing Deprecation Warnings
- Example: Deprecation headers
- 9. Implementing Version Migration Logic
- 10. Managing Parallel Version Support
- 11. Implementing Version Negotiation
- 12. Implementing Version Sunset Policy
- Sunset Sequence
- 1. Implementing Offset-Based Pagination
- Example: Offset query
- 2. Implementing Cursor-Based Pagination
- Example: Keyset cursor
- 3. Designing Page Response Format
- 4. Implementing Total Count Calculation
- 5. Handling Empty Results
- Example: Empty page
- 6. Designing Default Page Sizes
- 7. Implementing Sorting with Pagination
- 8. Using HATEOAS Links
- Example: Page links
- 9. Handling Large Datasets
- 10. Implementing Search with Pagination
- 11. Implementing Pagination Metadata
- 12. Implementing Consistent Pagination
- 1. Implementing OpenAPI Annotations
- Example: springdoc-openapi
- 2. Documenting Request/Response Examples
- Example: @ExampleObject
- 3. Documenting Authentication
- Example: Security scheme
- 4. Documenting Schema Definitions
- 5. Documenting Error Responses
- Example: Common error responses
- 6. Implementing Code Generation Configuration
- 7. Using Documentation Annotations
- 8. Implementing Custom Documentation Generators
- 9. Implementing Documentation Versioning
- 10. Implementing Interactive Documentation
- 11. Documenting API Rate Limits
- Example: Rate-limit docs
- 12. Documenting Deprecation Notices
- 1. Creating Custom Exception Hierarchies
- Example: Domain exceptions
- 2. Implementing Global Exception Handlers
- Example: @RestControllerAdvice
- 3. Designing Error Response Format
- 4. Implementing Exception Translation
- 5. Implementing Circuit Breaker Pattern
- Example: Resilience4j
- 6. Handling Validation Errors
- Example: Field error mapping
- 7. Logging Exceptions Appropriately
- 8. Implementing Retry Logic
- Example: Resilience4j retry
- 9. Designing Fallback Mechanisms
- 10. Using Result Objects vs Exceptions
- Exceptions
- Result<T,E>
- 11. Implementing Error Codes
- 12. Implementing Correlation IDs
- Example: Servlet filter
- 1. Designing User Authentication Flow
- 2. Implementing JWT Generation and Validation
- Example: Generate and verify (jjwt)
- 3. Implementing Session Management
- 4. Implementing OAuth 2.0 Client
- 5. Designing Password Storage
- Example: Spring Security PasswordEncoder
- 6. Implementing Multi-Factor Authentication
- 7. Implementing API Key Validation
- 8. Implementing SSO Integration
- 9. Handling Token Refresh Logic
- Example: Refresh endpoint
- 10. Implementing Authentication Filters
- 11. Implementing Remember Me Logic
- 12. Implementing Account Lockout
- 1. Implementing Role-Based Access Control (RBAC)
- Example: Spring Security check
- 2. Implementing Attribute-Based Access Control (ABAC)
- 3. Designing Permission Checking Logic
- Example: Permission service
- 4. Implementing Resource-Level Authorization
- 5. Using Authorization Annotations
- 6. Implementing Policy-Based Authorization
- Example: OPA Rego policy
- 7. Implementing Hierarchical Roles
- Example: Role hierarchy (Spring)
- 8. Handling Dynamic Permissions
- 9. Implementing Method-Level Security
- 10. Implementing Claim-Based Authorization
- Example: JWT claim check
- 11. Implementing Permission Caching
- 12. Implementing Authorization Audit Trail
- 1. Implementing Input Sanitization
- 2. Implementing CORS Configuration
- Example: Spring CORS
- 3. Implementing Security Headers
- 4. Implementing Request Signing Validation
- Example: HMAC signature
- 5. Implementing IP Whitelisting Logic
- 6. Implementing Audit Logging
- 7. Implementing Sensitive Data Handling
- 8. Implementing API Key Validation
- 9. Implementing Request/Response Encryption
- 10. Implementing Security Filters
- 11. Implementing CSRF Protection
- 12. Implementing Rate Limiting for Security
- 1. Implementing Token Bucket Algorithm
- Example: Bucket4j
- 2. Implementing Leaky Bucket Algorithm
- 3. Implementing Fixed Window Counter
- 4. Implementing Sliding Window Log
- 5. Implementing Rate Limit Scopes
- 6. Implementing Rate Limit Storage
- 7. Implementing Rate Limit Headers (X-RateLimit-*)
- 8. Implementing Rate Limit Exceeded Handler
- Example: 429 response
- 9. Implementing Dynamic Rate Limits
- 10. Implementing Rate Limit Bypass Logic
- 11. Implementing Sliding Window Counter
- 12. Implementing Distributed Rate Limiting
- Example: Redis token bucket (atomic Lua)
- 1. Understanding Idempotent Operations
- 2. Implementing Idempotency Key Validation
- 3. Implementing Idempotency Key Storage
- 4. Implementing Idempotent POST Handler
- Example: Handler flow
- 5. Implementing Response Caching
- 6. Implementing Retry-Safe Operations
- 7. Implementing Idempotency Token Expiration
- 8. Implementing Natural Idempotency
- 9. Handling Concurrent Idempotent Requests
- 10. Implementing Idempotency Audit Trail
- 11. Implementing Idempotency Middleware
- Example: Spring filter
- 12. Implementing Payment Idempotency
- 1. Implementing Cache-Aside Pattern
- Example: Read-through
- 2. Implementing Write-Through Cache
- 3. Implementing Write-Behind Cache
- 4. Implementing Cache Invalidation Logic
- 5. Implementing In-Memory Caching
- Example: Caffeine
- 6. Implementing Distributed Caching
- 7. Implementing Cache Hierarchies
- 8. Implementing Cache Warming
- 9. Designing Cache Key Generation
- 10. Handling Cache Stampede
- 11. Using Cache Annotations
- Example: Spring Cache
- 12. Implementing Cache Metrics
- 1. Implementing Structured Logging
- Example: SLF4J + JSON
- 2. Defining Log Levels
- 3. Implementing Correlation IDs
- 4. Using MDC for Context
- Example: MDC scoped context
- 5. Implementing Audit Logging
- 6. Implementing Exception Logging
- 7. Implementing Performance Logging
- Example: Timed operation
- 8. Implementing Request/Response Logging
- 9. Handling Sensitive Data in Logs
- 10. Implementing Log Rotation Configuration
- Example: Logback rolling policy
- 11. Implementing Log Aggregation
- 12. Implementing Log Sampling
- 1. Designing Configuration Hierarchy
- 2. Implementing Externalized Configuration
- 3. Using Environment-Specific Configs
- Example: Spring profiles
- 4. Implementing Configuration Encryption
- 5. Implementing Feature Flags
- Example: Flag check
- 6. Using Configuration Profiles
- 7. Implementing Dynamic Configuration Refresh
- 8. Implementing Configuration Validation
- Example: @ConfigurationProperties + @Validated
- 9. Using Environment Variables
- 10. Implementing Configuration Binding
- 11. Implementing Secret Management
- 12. Implementing Configuration Auditing
- 1. Designing Thread-Safe Services
- 2. Implementing Synchronization Mechanisms
- 3. Using Concurrent Data Structures
- 4. Implementing Async Processing
- Example: Spring @Async
- 5. Implementing Idempotency Keys
- 6. Handling Race Conditions
- 7. Designing Deadlock Prevention
- 8. Implementing Thread Pools
- Example: Bounded executor
- 9. Using Reactive Programming
- 10. Implementing Read-Write Locks
- Example: ReentrantReadWriteLock
- 11. Implementing Semaphores
- Example: Concurrency limit
- 12. Implementing Lock-Free Algorithms
- 1. Designing Domain Events
- Example: Domain event record
- 2. Implementing Event Publisher
- Example: Spring ApplicationEventPublisher
- 3. Implementing Event Subscriber
- Example: @EventListener
- 4. Implementing Event Bus
- 5. Handling Async Event Processing
- 6. Implementing Event Sourcing
- 7. Implementing Event Replay
- Example: Rebuild aggregate
- 8. Designing Event Schema
- 9. Implementing Event Versioning
- 10. Handling Event Ordering
- 11. Implementing Event Deduplication
- 12. Implementing Event Audit Trail
- 1. Designing Message Producer
- Example: Kafka producer
- 2. Designing Message Consumer
- Example: @KafkaListener
- 3. Implementing Message Acknowledgment
- 4. Implementing Dead Letter Queues
- 5. Implementing Message Retry Logic
- Example: Spring Retry on consumer
- 6. Designing Message Format
- 7. Implementing Message Routing
- 8. Implementing Topic Subscription
- 9. Handling Message Ordering
- 10. Implementing Message Persistence
- 11. Implementing Producer Retry Logic
- 12. Implementing Consumer Group Management
- 1. Designing Job Queue System
- 2. Implementing Scheduled Jobs
- Example: @Scheduled cron
- 3. Implementing Cron Job Processor
- 4. Implementing Job Scheduling Logic
- 5. Handling Job Failures
- 6. Implementing Job Retry Logic
- 7. Implementing Distributed Job Locks
- Example: ShedLock
- 8. Implementing Job Priority Queues
- 9. Implementing Job Status Tracking
- 10. Implementing Long-Running Job Logic
- 11. Handling Job Concurrency
- 12. Implementing Job Result Storage
- 1. Implementing JSON Serialization
- Example: Jackson ObjectMapper
- 2. Implementing Custom Serializers
- Example: Money serializer
- 3. Handling Date/Time Serialization
- 4. Handling Polymorphic Types
- Example: Sealed + JsonTypeInfo
- 5. Implementing Deep Copy Logic
- 6. Implementing Field Filtering
- 7. Handling Null Values
- 8. Implementing Versioned DTOs
- 9. Handling Circular References
- 10. Implementing Schema Validation
- 11. Handling Binary Data
- 12. Implementing Compression
- 1. Implementing Multipart Upload Handler
- Example: Spring MultipartFile
- 2. Implementing File Validation
- 3. Implementing Storage Logic
- 4. Implementing Chunked Upload
- 5. Implementing Resume Upload Logic
- 6. Handling Large File Uploads
- 7. Implementing Virus Scanning
- 8. Implementing Image Processing
- 9. Implementing Cloud Storage Integration
- Example: AWS S3 PutObject
- 10. Implementing Pre-Signed URLs
- Example: Pre-signed PUT
- 11. Implementing Upload Progress Tracking
- 12. Implementing File Deletion Logic
- 1. Implementing Basic Search Logic
- Example: SQL LIKE search
- 2. Implementing Full-Text Search
- Example: PostgreSQL tsvector
- 3. Implementing Search Indexing
- 4. Implementing Search Filters
- 5. Implementing Search Pagination
- 6. Implementing Search Ranking
- 7. Implementing Faceted Search
- Example: Elasticsearch aggregations
- 8. Implementing Auto-Complete
- 9. Implementing Search Suggestions
- 10. Implementing Search Result Highlighting
- Example: Elasticsearch highlight
- 11. Implementing Search Analytics
- 12. Integrating Search Engines (Elasticsearch)
- 1. Designing Notification System Architecture
- 2. Implementing Email Notifications
- Example: Spring JavaMailSender
- 3. Implementing SMS Notifications
- 4. Implementing Push Notifications
- 5. Implementing In-App Notifications
- 6. Implementing Notification Templates
- Example: Thymeleaf email template
- 7. Implementing Notification Preferences
- 8. Implementing Notification Queuing
- 9. Implementing Delivery Tracking
- 10. Implementing Retry Logic for Failed Notifications
- 11. Implementing Notification Batching
- 12. Implementing Multi-Channel Notifications
- 1. Designing Webhook Subscription System
- 2. Implementing Webhook Delivery Logic
- Example: Async POST
- 3. Implementing Webhook Signing
- Example: HMAC-SHA256
- 4. Implementing Webhook Verification (Server)
- 5. Implementing Retry Logic with Exponential Backoff
- 6. Implementing Webhook Delivery Tracking
- 7. Implementing Webhook Failure Handling
- 8. Implementing Webhook Event Filtering
- 9. Implementing Webhook Replay
- 10. Implementing Webhook Security
- 11. Implementing Webhook Rate Limiting
- 12. Implementing Webhook Logging
- 1. Implementing CSV Export
- Example: Streaming CSV
- 2. Implementing Excel Export
- 3. Implementing PDF Export
- 4. Implementing JSON Export
- Example: Streaming JSON array
- 5. Implementing Streaming Export for Large Datasets
- 6. Implementing Async Export Generation
- 7. Implementing Export Format Selection
- 8. Implementing Export Compression
- 9. Implementing Export Pagination
- 10. Handling Export Field Selection
- 11. Implementing Export Scheduling
- 12. Implementing Export Audit Trail
- 1. Designing Bulk API Endpoints
- 2. Implementing Bulk Insert Logic
- Example: JDBC batch
- 3. Implementing Bulk Update Logic
- Example: Set-based UPDATE
- 4. Implementing Bulk Delete Logic
- 5. Implementing Bulk Import from CSV
- Example: Streaming CSV reader
- 6. Implementing Bulk Export
- 7. Handling Partial Failures
- 8. Implementing Bulk Operation Progress
- 9. Implementing Bulk Operation Validation
- 10. Implementing Bulk Operation Rollback
- 11. Implementing Bulk Operation Throttling
- 12. Implementing Bulk Operation Reporting
- 1. Designing Soft Delete Schema
- 2. Implementing Soft Delete Filter
- Example: Hibernate @SQLRestriction
- 3. Implementing Restore Logic
- Example: Restore endpoint
- 4. Handling Cascade Soft Deletes
- 5. Implementing Hard Delete Logic
- 6. Implementing Soft Delete Audit
- 7. Handling Unique Constraints with Soft Delete
- 8. Implementing Soft Delete Queries
- 9. Implementing Permanent Delete After Period
- Example: Cleanup job
- 10. Handling Soft Delete in Joins
- 11. Implementing Soft Delete Indicators
- 12. Implementing Bulk Soft Delete
- Example: Bulk update
- 1. Designing Multi-Tenancy Architecture
- 2. Implementing Tenant Identification
- 3. Implementing Database Isolation Strategies
- 4. Implementing Schema Per Tenant
- Example: Hibernate MultiTenantConnectionProvider
- 5. Implementing Database Per Tenant
- 6. Implementing Shared Schema with Tenant ID
- Example: Postgres Row-Level Security
- 7. Implementing Tenant Context Propagation
- Example: Filter + ThreadLocal holder
- 8. Implementing Tenant-Specific Configuration
- 9. Implementing Cross-Tenant Operations
- 10. Implementing Tenant Provisioning
- 11. Implementing Tenant Migration Logic
- 12. Implementing Tenant Resource Limits
- 1. Implementing Message Bundles
- Example: messages_en.properties
- 2. Implementing Locale Detection
- 3. Implementing Translation Lookup
- Example: Spring MessageSource
- 4. Handling Pluralization
- Example: ICU plural
- 5. Implementing Date/Time Localization
- Example: java.time formatters
- 6. Implementing Number/Currency Localization
- Example: Currency format
- 7. Implementing Right-to-Left Support
- 8. Implementing Locale-Specific Validation
- 9. Implementing Translation Caching
- 10. Implementing Fallback Locale Logic
- 11. Implementing Dynamic Language Switching
- Example: LocaleChangeInterceptor
- 12. Implementing Translation Management
- 1. Implementing WebSocket Connections
- Example: Spring @MessageMapping
- 2. Implementing Server-Sent Events
- Example: SSE endpoint
- 3. Implementing Long Polling
- 4. Implementing Message Broadcasting
- 5. Handling Connection Lifecycle
- 6. Implementing Authentication for WebSockets
- 7. Implementing Presence Tracking
- 8. Implementing Real-Time Notifications
- 9. Implementing Pub/Sub Pattern
- Example: Redis pub/sub
- 10. Handling Reconnection Logic
- 11. Implementing Message Queuing for Offline Users
- 12. Implementing Real-Time Event Filtering
- 1. Implementing REST Client Logic
- Example: Spring RestClient (modern)
- 2. Implementing gRPC Client/Server
- Example: Server stub
- 3. Implementing Service Discovery Logic
- 4. Implementing Load Balancing Logic
- 5. Implementing Circuit Breaker for External Calls
- Example: Resilience4j
- 6. Implementing Retry Logic for Service Calls
- 7. Implementing Service Mesh Patterns
- 8. Implementing API Gateway Communication
- 9. Implementing Saga Pattern
- 10. Implementing Event-Driven Communication
- 11. Implementing Synchronous vs Asynchronous
- Sync (REST/gRPC)
- Async (Queue/Event)
- 12. Implementing Service Versioning
- 1. Implementing Logging Aspects
- Example: Method entry/exit logger
- 2. Implementing Performance Monitoring Aspects
- Example: Micrometer timer
- 3. Implementing Security Aspects
- 4. Implementing Transaction Aspects
- 5. Implementing Caching Aspects
- 6. Implementing Audit Aspects
- Example: @Auditable
- 7. Implementing Validation Aspects
- 8. Implementing Exception Handling Aspects
- Example: @AfterThrowing
- 9. Designing Pointcut Expressions
- 10. Implementing Around Advice
- 11. Implementing Custom Annotations
- Example: Marker annotation
- 12. Implementing Cross-Cutting Concerns
- 1. Implementing Reactive Streams
- 2. Using Mono and Flux
- Example: Project Reactor
- 3. Implementing Reactive Operators
- 4. Handling Backpressure
- 5. Implementing Reactive Repositories
- Example: R2DBC repository
- 6. Implementing Reactive Web Controllers
- Example: WebFlux
- 7. Handling Reactive Error Handling
- 8. Implementing Reactive Composition
- Example: Combine sources
- 9. Implementing Reactive Testing
- Example: StepVerifier
- 10. Handling Schedulers
- 11. Implementing Reactive Caching
- 12. Implementing Reactive Security
- 1. Implementing Database Query Optimization
- 2. Implementing Caching Strategies
- 3. Implementing Connection Pooling
- 4. Implementing Async Processing
- 5. Implementing Lazy Loading
- 6. Implementing Pagination Optimization
- Example: Keyset pagination
- 7. Implementing Database Indexing Strategy
- 8. Implementing Response Compression
- 9. Implementing Resource Pooling
- 10. Implementing Memory Optimization
- 11. Implementing CPU Optimization
- 12. Implementing Network Optimization
- 1. Implementing Code Reviews
- 2. Implementing Static Analysis
- 3. Implementing Code Coverage
- 4. Implementing Linting Rules
- 5. Implementing Documentation Standards
- 6. Implementing Code Formatting
- Example: Spotless config (Gradle)
- 7. Implementing Code Complexity Limits
- 8. Implementing Refactoring Patterns
- 9. Implementing Technical Debt Tracking
- 10. Implementing Best Practices
- 11. Implementing Code Smells Detection
- 12. Implementing Code Metrics
- 1. Designing Unit Tests
- Example: JUnit 5 + AssertJ
- 2. Implementing Integration Tests
- 3. Implementing End-to-End Tests
- 4. Implementing Mock Objects
- Example: Mockito
- 5. Implementing Test Doubles
- 6. Implementing Test Data Builders
- Example: Builder for tests
- 7. Implementing Database Test Strategies
- 8. Implementing Performance Tests
- 9. Implementing Security Tests
- 10. Implementing Contract Tests
- 11. Implementing Test Coverage Goals
- 12. Implementing Test Automation in CI/CD