Release v1.0.0: Complete Phase 1 with Advanced Retry Strategies

🎉 STABLE RELEASE - Hammerwork reaches v1.0.0 with comprehensive feature completeness\!

Major additions:
- Advanced Retry Strategies system with 5 retry patterns
  * Fixed, Linear, Exponential, Fibonacci, and Custom strategies
  * Jitter support (Additive/Multiplicative) to prevent thundering herd
  * Job-level and worker-level retry configuration
  * Full backward compatibility with existing retry system

- Comprehensive test suite migration to use proper migration system
  * Migrated all tests from deprecated create_tables() method
  * New test_utils.rs with migration-based setup functions
  * Updated integration_tests.rs, result_storage_tests.rs, worker_batch_tests.rs, batch_tests.rs

- Complete documentation updates for v1.0.0 release
  * Updated ROADMAP.md marking Phase 1 as complete
  * Comprehensive CHANGELOG.md entry documenting all features
  * Updated README.md with new features and v1.0 examples
  * Added retry_strategies.rs example demonstrating all patterns

Technical implementation:
- Extended Job struct with optional retry_strategy field
- Added Worker default_retry_strategy configuration
- Updated PostgreSQL and MySQL queue implementations
- Comprehensive serialization support for database persistence
- Priority order: Job strategy → Worker default → Legacy fixed delay
- Full async/await compatibility throughout retry system

Quality improvements:
- Fixed all compilation warnings and errors
- Resolved feature-gated compilation issues in examples
- All 141 unit tests passing
- Clippy checks passing with -D warnings
- Release build successful

This release completes Hammerwork's Phase 1 roadmap, establishing a robust
foundation for high-performance job processing with enterprise-grade features.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: CodingAnarchy

CHANGELOG.md

@@ -5,6 +5,69 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.0] - 2025-06-27
+
+🎉 **STABLE RELEASE** - Hammerwork has reached v1.0.0 with comprehensive feature completeness!
+
+### Added
+- **🔄 Advanced Retry Strategies** - The final Phase 1 feature completing Hammerwork's core functionality
+  - `RetryStrategy` enum with five comprehensive retry patterns:
+    - `Fixed(Duration)` - Consistent delay between retry attempts
+    - `Linear { base, increment, max_delay }` - Linear backoff with optional ceiling
+    - `Exponential { base, multiplier, max_delay, jitter }` - Exponential backoff with configurable jitter
+    - `Fibonacci { base, max_delay }` - Fibonacci sequence delays for gentle growth
+    - `Custom(Box<dyn Fn(u32) -> Duration>)` - Fully customizable retry logic
+  - `JitterType` enum for preventing thundering herd problems:
+    - `Additive` - Adds random jitter to delay
+    - `Multiplicative` - Multiplies delay by random factor
+  - Comprehensive job-level retry configuration with builder methods:
+    - `with_retry_strategy()` - Set complete retry strategy
+    - `with_exponential_backoff()` - Quick exponential backoff setup
+    - `with_linear_backoff()` - Quick linear backoff setup  
+    - `with_fibonacci_backoff()` - Quick Fibonacci backoff setup
+  - Worker-level default retry strategies with `with_default_retry_strategy()`
+  - Priority order: Job strategy → Worker default strategy → Legacy fixed delay
+  - Full backward compatibility with existing fixed retry delay system
+  - Comprehensive serialization support for database persistence
+  - `fibonacci()` utility function for easy Fibonacci sequence generation
+
+- **🧪 Comprehensive Test Suite Migration**
+  - Migrated entire test suite from deprecated `create_tables()` to migration system
+  - New `test_utils.rs` module with migration-based setup functions
+  - Updated all test files: `integration_tests.rs`, `result_storage_tests.rs`, `worker_batch_tests.rs`, `batch_tests.rs`
+  - Leverages proper `cargo hammerwork migrate` workflow for test database setup
+  - Maintains comprehensive test coverage across PostgreSQL and MySQL
+
+- **📖 Complete Documentation and Examples**
+  - `retry_strategies.rs` example demonstrating all retry patterns
+  - Worker-level and job-level retry configuration examples
+  - Comprehensive ROADMAP.md updates marking Phase 1 complete
+  - Detailed implementation examples for each retry strategy type
+  - Best practices documentation for retry strategy selection
+
+### Enhanced
+- **Job Structure**: Extended with optional `retry_strategy` field
+- **Worker Configuration**: Added `default_retry_strategy` field for worker-level defaults
+- **Library Exports**: Added all retry strategy types to public API: `RetryStrategy`, `JitterType`, `fibonacci`
+- **Database Compatibility**: Both PostgreSQL and MySQL implementations updated for new retry system
+- **Error Handling**: Improved error messages and validation for retry configuration
+
+### Technical Implementation
+- **Backward Compatibility**: Existing jobs continue working with fixed delay system
+- **Memory Efficient**: Lazy strategy evaluation with smart default handling
+- **Type Safety**: Strongly typed retry strategies with comprehensive validation
+- **Async Compatible**: Full async/await support throughout retry system
+- **Database Agnostic**: Retry strategies work identically across PostgreSQL and MySQL
+- **Extensible**: Custom retry strategies support any business logic requirements
+
+### Migration Guide
+- **No Breaking Changes**: All existing code continues to work unchanged
+- **Opt-in Enhancement**: Add retry strategies to jobs for enhanced retry behavior
+- **Database Migration**: Run `cargo hammerwork migrate` to prepare for v1.0.0 features
+- **Test Updates**: Tests now use migration system instead of `create_tables()`
+
+This release represents the completion of Hammerwork's Phase 1 roadmap, establishing a robust foundation for high-performance job processing with advanced retry strategies, comprehensive monitoring, and enterprise-grade features.
+
 ## [0.9.0] - 2025-06-27
 
 ### Added

Cargo.toml

@@ -29,7 +29,7 @@ clap = { version = "4.0", features = ["derive"] }
 
 [package]
 name = "hammerwork"
-version = "0.9.0"
+version = "1.0.0"
 edition = "2024"
 description = "A high-performance, database-driven job queue for Rust with PostgreSQL and MySQL support, featuring job prioritization, cron scheduling, timeouts, rate limiting, Prometheus metrics, alerting, and comprehensive statistics collection"
 license = "MIT"

README.md

@@ -5,7 +5,10 @@ A high-performance, database-driven job queue for Rust with comprehensive featur
 ## Features
 
 - **Multi-database support**: PostgreSQL and MySQL backends
+- **Advanced retry strategies**: Exponential backoff, linear, Fibonacci, and custom retry patterns with jitter
 - **Job prioritization**: Five priority levels with weighted and strict scheduling algorithms
+- **Result storage**: Database and in-memory result storage with TTL and automatic cleanup
+- **Worker autoscaling**: Dynamic worker pool scaling based on queue depth and configurable thresholds
 - **Batch operations**: High-performance bulk job enqueuing with optimized worker processing
 - **Cron scheduling**: Full cron expression support with timezone awareness
 - **Rate limiting**: Token bucket rate limiting with configurable burst limits
@@ -20,12 +23,12 @@ A high-performance, database-driven job queue for Rust with comprehensive featur
 ```toml
 [dependencies]
 # Default features include metrics and alerting
-hammerwork = { version = "0.7", features = ["postgres"] }
+hammerwork = { version = "1.0", features = ["postgres"] }
 # or
-hammerwork = { version = "0.7", features = ["mysql"] }
+hammerwork = { version = "1.0", features = ["mysql"] }
 
 # Minimal installation
-hammerwork = { version = "0.7", features = ["postgres"], default-features = false }
+hammerwork = { version = "1.0", features = ["postgres"], default-features = false }
 ```
 
 **Feature Flags**: `postgres`, `mysql`, `metrics` (default), `alerting` (default)
@@ -48,9 +51,9 @@ See the [Quick Start Guide](docs/quick-start.md) for complete examples with Post
 ## Basic Example
 
 ```rust
-use hammerwork::{Job, Worker, WorkerPool, JobQueue};
+use hammerwork::{Job, Worker, WorkerPool, JobQueue, RetryStrategy};
 use serde_json::json;
-use std::sync::Arc;
+use std::{sync::Arc, time::Duration};
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
@@ -66,13 +69,21 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
         })
     });
 
-    // Start worker
-    let worker = Worker::new(queue.clone(), "default".to_string(), handler);
+    // Start worker with retry strategy
+    let worker = Worker::new(queue.clone(), "default".to_string(), handler)
+        .with_default_retry_strategy(RetryStrategy::exponential(
+            Duration::from_secs(1), 2.0, Some(Duration::from_secs(60))
+        ));
     let mut pool = WorkerPool::new();
     pool.add_worker(worker);
 
-    // Enqueue jobs
-    let job = Job::new("default".to_string(), json!({"task": "send_email"}));
+    // Enqueue jobs with advanced retry strategies
+    let job = Job::new("default".to_string(), json!({"task": "send_email"}))
+        .with_exponential_backoff(
+            Duration::from_secs(2),
+            2.0,
+            Duration::from_minutes(10)
+        );
     queue.enqueue(job).await?;
 
     pool.start().await
@@ -117,11 +128,12 @@ queue.enqueue(job).await?;
 ### Database Schema
 
 Hammerwork uses optimized tables with comprehensive indexing:
-- **`hammerwork_jobs`** - Main job table with priorities, timeouts, cron scheduling, and result storage
+- **`hammerwork_jobs`** - Main job table with priorities, timeouts, cron scheduling, retry strategies, and result storage
 - **`hammerwork_batches`** - Batch metadata and tracking (v0.7.0+)
+- **`hammerwork_job_results`** - Job result storage with TTL and expiration (v0.8.0+)
 - **`hammerwork_migrations`** - Migration tracking for schema evolution
 
-The schema supports all features including job prioritization, timeouts, cron scheduling, batch processing, result storage, and comprehensive lifecycle tracking. See [Database Migrations](docs/migrations.md) for details.
+The schema supports all features including job prioritization, advanced retry strategies, timeouts, cron scheduling, batch processing, result storage with TTL, worker autoscaling, and comprehensive lifecycle tracking. See [Database Migrations](docs/migrations.md) for details.
 
 ## Development
 
@@ -147,6 +159,8 @@ Working examples in `examples/`:
 - `priority_example.rs` - Priority system demonstration
 - `batch_example.rs` - Bulk job enqueuing and processing
 - `worker_batch_example.rs` - Worker batch processing features
+- `retry_strategies.rs` - Advanced retry patterns with exponential backoff and jitter
+- `result_storage_example.rs` - Job result storage and retrieval
 
 ```bash
 cargo run --example postgres_example --features postgres

ROADMAP.md

@@ -2,25 +2,63 @@
 
 This roadmap outlines planned features for Hammerwork, prioritized by impact level and implementation complexity. Features are organized into phases based on their value proposition to users and estimated development effort.
 
-## Phase 1: High Impact, Low-Medium Complexity
+## Phase 1: High Impact, Low-Medium Complexity ✅ COMPLETE
 *Essential features that provide significant value with reasonable implementation effort*
 
-### 📋 Advanced Scheduling Patterns
+### ✅ Advanced Scheduling Patterns (COMPLETED v1.0.0)
 **Impact: Medium-High** | **Complexity: Medium** | **Priority: High**
 
-Improves retry logic and reduces system load during failures.
+**Status: ✅ Implemented** - Provides advanced retry strategies with exponential backoff, jitter, and custom scheduling patterns.
 
 ```rust
-// Exponential backoff scheduling
+// Exponential backoff with jitter (prevents thundering herd)
 let job = Job::new("retry_job".to_string(), payload)
-    .with_exponential_backoff(Duration::from_secs(1), 2.0, Duration::from_minutes(10));
+    .with_exponential_backoff(
+        Duration::from_secs(1),      // base delay
+        2.0,                         // multiplier  
+        Duration::from_minutes(10)   // max delay
+    );
 
-// Custom scheduling strategies
+// Fibonacci backoff for gentle growth
 let job = Job::new("scheduled_job".to_string(), payload)
-    .with_schedule_strategy(ScheduleStrategy::Fibonacci) // 1, 1, 2, 3, 5, 8... seconds
-    .with_schedule_strategy(ScheduleStrategy::Linear(Duration::from_secs(30))); // 30, 60, 90... seconds
+    .with_fibonacci_backoff(
+        Duration::from_secs(2),
+        Some(Duration::from_minutes(5))
+    );
+
+// Linear backoff for steady increase
+let job = Job::new("linear_job".to_string(), payload)
+    .with_linear_backoff(
+        Duration::from_secs(5),      // base delay
+        Duration::from_secs(10),     // increment
+        Some(Duration::from_secs(60)) // max delay
+    );
+
+// Custom retry logic for business rules
+let job = Job::new("custom_job".to_string(), payload)
+    .with_retry_strategy(RetryStrategy::custom(|attempt| {
+        match attempt {
+            1..=3 => Duration::from_secs(2),     // Quick retries
+            4..=6 => Duration::from_secs(30),    // Medium delays
+            _ => Duration::from_minutes(10),     // Long delays
+        }
+    }));
+
+// Worker-level default strategies
+let worker = Worker::new(queue, "api_tasks".to_string(), handler)
+    .with_default_retry_strategy(RetryStrategy::exponential(
+        Duration::from_secs(1), 2.0, Some(Duration::from_minutes(5))
+    ));
 ```
 
+**Key Features Implemented:**
+- ✅ Fixed, Linear, Exponential, Fibonacci, and Custom retry strategies
+- ✅ Additive and Multiplicative jitter types to prevent thundering herd
+- ✅ Job-level retry strategy overrides
+- ✅ Worker-level default retry strategies
+- ✅ Full backward compatibility with existing fixed delay system
+- ✅ Comprehensive test coverage and examples
+
 ## Phase 2: High Impact, Medium-High Complexity
 *Features that provide significant value but require more substantial implementation effort*
 
@@ -245,11 +283,10 @@ let geo_config = GeoReplicationConfig::new()
 
 Features are ordered within each phase by priority and should generally be implemented in the following sequence:
 
-**Phase 1 (Foundation)**
-1. Job Result Storage & Retrieval
-2. Advanced Scheduling Patterns
+**Phase 1 (Foundation) ✅ COMPLETE**
+1. ✅ Advanced Scheduling Patterns (v1.0.0)
 
-**Phase 2 (Advanced Features)**
+**Phase 2 (Advanced Features) - NEXT PRIORITIES**
 1. Job Dependencies & Workflows
 2. Job Tracing & Correlation
 3. Admin Dashboard & CLI Tools

example_retry_strategy.rs

@@ -0,0 +1,136 @@
+//! Example demonstrating the retry strategy functionality in Hammerwork
+//!
+//! This example shows how to use different retry strategies:
+//! 1. Job-specific retry strategy (takes precedence)
+//! 2. Worker default retry strategy (fallback)
+//! 3. Fixed retry delay (legacy fallback)
+
+use hammerwork::{Job, Worker, retry::RetryStrategy, JitterType};
+use serde_json::json;
+use std::time::Duration;
+
+#[tokio::main]
+async fn main() {
+    println!("=== Hammerwork Retry Strategy Example ===\n");
+    
+    // Example 1: Job with exponential backoff strategy
+    println!("1. Job with exponential backoff:");
+    let job_with_exponential = Job::new("test".to_string(), json!({"task": "api_call"}))
+        .with_retry_strategy(RetryStrategy::exponential(
+            Duration::from_secs(1),    // base delay
+            2.0,                       // multiplier
+            Some(Duration::from_secs(300)) // max delay (5 minutes)
+        ));
+    
+    println!("   Retry delays for exponential backoff:");
+    if let Some(strategy) = &job_with_exponential.retry_strategy {
+        for attempt in 1..=6 {
+            let delay = strategy.calculate_delay(attempt);
+            println!("   Attempt {}: {:?}", attempt, delay);
+        }
+    }
+    println!();
+    
+    // Example 2: Job with linear backoff strategy
+    println!("2. Job with linear backoff:");
+    let job_with_linear = Job::new("test".to_string(), json!({"task": "database_operation"}))
+        .with_retry_strategy(RetryStrategy::linear(
+            Duration::from_secs(5),     // base delay
+            Duration::from_secs(10),    // increment
+            Some(Duration::from_secs(120)) // max delay (2 minutes)
+        ));
+    
+    println!("   Retry delays for linear backoff:");
+    if let Some(strategy) = &job_with_linear.retry_strategy {
+        for attempt in 1..=8 {
+            let delay = strategy.calculate_delay(attempt);
+            println!("   Attempt {}: {:?}", attempt, delay);
+        }
+    }
+    println!();
+    
+    // Example 3: Job with Fibonacci backoff strategy
+    println!("3. Job with Fibonacci backoff:");
+    let job_with_fibonacci = Job::new("test".to_string(), json!({"task": "file_processing"}))
+        .with_retry_strategy(RetryStrategy::fibonacci(
+            Duration::from_secs(2),     // base delay
+            Some(Duration::from_secs(180)) // max delay (3 minutes)
+        ));
+    
+    println!("   Retry delays for Fibonacci backoff:");
+    if let Some(strategy) = &job_with_fibonacci.retry_strategy {
+        for attempt in 1..=10 {
+            let delay = strategy.calculate_delay(attempt);
+            println!("   Attempt {}: {:?}", attempt, delay);
+        }
+    }
+    println!();
+    
+    // Example 4: Job with exponential backoff + jitter
+    println!("4. Job with exponential backoff + jitter:");
+    let job_with_jitter = Job::new("test".to_string(), json!({"task": "external_api"}))
+        .with_retry_strategy(RetryStrategy::exponential_with_jitter(
+            Duration::from_secs(1),     // base delay
+            2.0,                        // multiplier
+            Some(Duration::from_secs(300)), // max delay
+            JitterType::Multiplicative(0.2) // ±20% jitter
+        ));
+    
+    println!("   Retry delays for exponential backoff with jitter:");
+    println!("   (Note: jitter makes each run different)");
+    if let Some(strategy) = &job_with_jitter.retry_strategy {
+        for attempt in 1..=5 {
+            let delay = strategy.calculate_delay(attempt);
+            println!("   Attempt {}: {:?}", attempt, delay);
+        }
+    }
+    println!();
+    
+    // Example 5: Custom retry strategy
+    println!("5. Job with custom retry strategy:");
+    let custom_strategy = RetryStrategy::custom(|attempt| {
+        match attempt {
+            1..=3 => Duration::from_secs(5),   // Quick retries for transient issues
+            4..=6 => Duration::from_secs(60),  // Medium delays for persistent issues
+            _ => Duration::from_secs(300),     // Long delays for severe issues
+        }
+    });
+    
+    let job_with_custom = Job::new("test".to_string(), json!({"task": "complex_operation"}))
+        .with_retry_strategy(custom_strategy);
+    
+    println!("   Retry delays for custom strategy:");
+    if let Some(strategy) = &job_with_custom.retry_strategy {
+        for attempt in 1..=8 {
+            let delay = strategy.calculate_delay(attempt);
+            println!("   Attempt {}: {:?}", attempt, delay);
+        }
+    }
+    println!();
+    
+    println!("=== Worker Configuration Examples ===\n");
+    
+    // Example: Worker with default retry strategy
+    println!("6. Worker with default exponential backoff strategy:");
+    println!("   This strategy applies to jobs that don't have their own retry strategy.");
+    println!("   Default strategy: exponential backoff (1s base, 1.5x multiplier, 10min max)");
+    
+    // Note: We can't actually create a complete worker without a database connection,
+    // but we can show how it would be configured:
+    println!("   
+    let worker = Worker::new(queue, \"api_queue\".to_string(), handler)
+        .with_default_retry_strategy(RetryStrategy::exponential(
+            Duration::from_secs(1),
+            1.5,
+            Some(Duration::from_secs(600))
+        ));
+    ");
+    
+    println!("\n=== Retry Strategy Priority ===");
+    println!("When a job fails, the retry delay is calculated using this priority:");
+    println!("1. Job-specific retry strategy (highest priority)");
+    println!("2. Worker default retry strategy");
+    println!("3. Fixed retry delay (legacy fallback)");
+    println!("\nThis allows for flexible retry behavior where individual jobs can");
+    println!("override the worker's default strategy when needed.");
+}