🚀 JCRON - High-Performance Go Job Scheduler

A modern, high-performance job scheduling library for Go. JCRON is designed to be a flexible and efficient alternative to standard cron libraries, incorporating advanced scheduling features inspired by the Quartz Scheduler while maintaining a simple and developer-friendly API.

Core philosophy: Built on performance, readability, and robustness.

⚡ Performance Highlights

Blazing fast performance - Core operations from 152ns to 289ns per calculation
Sub-nanosecond bit operations - Critical path operations under 0.3ns
Zero-allocation hot paths - Most operations with 0 allocations
Advanced scheduling - L (last) and # (nth) patterns with optimal performance
Memory-efficient - Smart caching with RWMutex protection
Thread-safe - Concurrent-safe design from the ground up

✨ Features

Core Functionality

✅ Standard & Advanced Cron Syntax - Fully compatible with 5-field and 6-field Vixie-cron formats
✅ Enhanced Scheduling Rules - Quartz-like specifiers (L for last, # for nth occurrence)
✅ High-Performance Algorithm - Mathematical "next jump" calculation instead of tick-by-tick checking
✅ Aggressive Caching - Parse once, cache forever with integer-based representations
✅ Built-in Error Handling & Retries - Configurable retry policies with delays
✅ Panic Recovery - Jobs that panic won't crash the runner
✅ Structured Logging - Integration with standard log/slog library
✅ Thread-Safe - Safe for concurrent use across multiple goroutines
✅ PostgreSQL Integration - Database-backed job scheduling for distributed systems

Performance Features

🚀 Blazing fast operations - Core calculations 152-289ns per operation
💾 Memory efficient - Minimal allocations with smart caching
🔄 Smart caching - Schedule parsing happens only once
⚡ Fast-path optimizations - Special handling for common patterns
🎯 Zero-allocation operations for most schedule calculations
⚙️ Sub-nanosecond bit ops - 0.3ns for critical path operations

📦 Installation

go get github.com/meftunca/jcron

🚀 Quick Start

Simple Job Scheduler

package main

import (
    "fmt"
    "log/slog"
    "os"
    "time"

    "github.com/meftunca/jcron"
)

func main() {
    // Create a structured logger
    logger := slog.New(slog.NewTextHandler(os.Stdout, nil))

    // Initialize the runner
    runner := jcron.NewRunner(logger)

    // Add a simple job - runs every 5 seconds
    _, err := runner.AddFuncCron("*/5 * * * * *", func() error {
        fmt.Println("Job executed at:", time.Now().Format(time.RFC3339))
        return nil
    })
    if err != nil {
        logger.Error("Failed to add job", "error", err)
        return
    }

    // Start the runner
    runner.Start()
    defer runner.Stop()

    logger.Info("JCRON runner started. Press CTRL+C to exit.")
    
    // Keep running for demo
    time.Sleep(30 * time.Second)
}

Manual Schedule Calculation

package main

import (
    "fmt"
    "time"
    
    "github.com/meftunca/jcron"
)

func main() {
    // Create a new engine
    engine := jcron.New()
    
    // Define a schedule (weekdays at 9:30 AM)
    schedule := jcron.Schedule{
        Second:     jcron.StrPtr("0"),
        Minute:     jcron.StrPtr("30"),
        Hour:       jcron.StrPtr("9"),
        DayOfMonth: jcron.StrPtr("*"),
        Month:      jcron.StrPtr("*"),
        DayOfWeek:  jcron.StrPtr("1-5"), // Monday to Friday
        Year:       jcron.StrPtr("*"),
        Timezone:   jcron.StrPtr("UTC"),
    }
    
    now := time.Now()
    
    // Get next execution time
    next, err := engine.Next(schedule, now)
    if err != nil {
        panic(err)
    }
    
    fmt.Printf("Next execution: %s\n", next.Format(time.RFC3339))
    
    // Get previous execution time
    prev, err := engine.Prev(schedule, now)
    if err != nil {
        panic(err)
    }
    
    fmt.Printf("Previous execution: %s\n", prev.Format(time.RFC3339))
}

🎯 Core Concepts

The Runner

The Runner is the heart of the scheduler. It manages the entire lifecycle of all jobs:

logger := slog.New(slog.NewTextHandler(os.Stdout, nil))
runner := jcron.NewRunner(logger)

runner.Start()
defer runner.Stop()

The Job Interface

Jobs must implement the Job interface:

type Job interface {
    Run() error
}

For convenience, you can use function jobs:

runner.AddFuncCron("0 17 * * 5", func() error {
    fmt.Println("TGIF! It's Friday 5 PM!")
    return nil
})

Retry Policies

Configure automatic retries for failing jobs:

import "time"

_, err := runner.AddFuncCron(
    "*/15 * * * * *",
    myJob,
    jcron.WithRetries(3, 5*time.Second), // 3 retries, 5s delay
)

📝 Cron Syntax

jcron supports both 6-field and 7-field cron expressions:

6-Field Format (Classic)

 ┌─────────── minute (0-59)
 │ ┌───────── hour (0-23)
 │ │ ┌─────── day of month (1-31)
 │ │ │ ┌───── month (1-12 or JAN-DEC)
 │ │ │ │ ┌─── day of week (0-6 or SUN-SAT)
 │ │ │ │ │ ┌─ year (optional)
 │ │ │ │ │ │
 * * * * * *

7-Field Format (With Seconds)

 ┌──────────── second (0-59)
 │ ┌─────────── minute (0-59)
 │ │ ┌───────── hour (0-23)
 │ │ │ ┌─────── day of month (1-31)
 │ │ │ │ ┌───── month (1-12 or JAN-DEC)
 │ │ │ │ │ ┌─── day of week (0-6 or SUN-SAT)
 │ │ │ │ │ │ ┌─ year (optional)
 │ │ │ │ │ │ │
 * * * * * * *

Special Characters

Character	Description	Example	Meaning
`*`	Any value	`* * * * *`	Every minute
`?`	Any value (alias for *)	`0 0 ? * MON`	Every Monday at midnight
`-`	Range	`0 9-17 * * *`	Every hour from 9 AM to 5 PM
`,`	List	`0 0 1,15 * *`	1st and 15th of every month
`/`	Step	`/5 * * *`	Every 5 minutes
`L`	Last	`0 0 L * *`	Last day of every month
`#`	Nth occurrence	`0 0 * * MON#2`	Second Monday of every month

Special "L" (Last) Patterns

// Last day of month
"0 0 L * *"

// Last Friday of month  
"0 22 * * 5L"

// Last weekday (Monday-Friday) of month
"0 18 * * 1-5L"

Special "#" (Nth Occurrence) Patterns

// Second Tuesday of every month
"0 14 * * 2#2"

// First and third Monday of every month
"0 9 * * 1#1,1#3"

// Fourth Friday of every month
"0 17 * * 5#4"

Predefined Schedules

Predefined	Equivalent	Description
`@yearly`	`0 0 1 1 *`	Once a year at midnight on January 1st
`@annually`	`0 0 1 1 *`	Same as @yearly
`@monthly`	`0 0 1 * *`	Once a month at midnight on the 1st
`@weekly`	`0 0 * * 0`	Once a week at midnight on Sunday
`@daily`	`0 0 * * *`	Once a day at midnight
`@midnight`	`0 0 * * *`	Same as @daily
`@hourly`	`0 * * * *`	Once an hour at the beginning of the hour

🐘 PostgreSQL Integration

JCRON includes a complete PostgreSQL implementation for database-backed job scheduling, perfect for distributed systems.

Setup

-- Load the JCRON PostgreSQL schema
\i sql-ports/psql.sql

Basic Usage

import (
    "database/sql"
    _ "github.com/lib/pq"
)

// Connect to PostgreSQL
db, err := sql.Open("postgres", "user=username dbname=mydb sslmode=disable")
if err != nil {
    log.Fatal(err)
}
defer db.Close()

// Add a job
_, err = db.Exec(`
    SELECT jcron.add_job_from_cron(
        'daily_backup',
        '@daily',
        'pg_dump mydatabase > /backup/daily.sql',
        'UTC'
    )
`)

// Get next execution time
var nextRun time.Time
err = db.QueryRow(`
    SELECT jcron.next_jump(
        '{"s":"0","m":"30","h":"9","D":"*","M":"*","dow":"1-5"}'::jsonb,
        NOW()
    )
`).Scan(&nextRun)

Advanced PostgreSQL Features

-- Job with retries and monitoring
SELECT jcron.add_job_from_cron(
    'health_check',
    '*/30 * * * * *',  -- Every 30 seconds
    'curl -f http://localhost:8080/health',
    'UTC',
    3,                 -- Max retries
    300                -- Retry delay (seconds)
);

-- Get job statistics
SELECT * FROM jcron.get_job_stats('health_check');

-- Monitor failed jobs
SELECT job_name, error_message, failed_at 
FROM jcron.failed_jobs_view;

-- Run maintenance
SELECT * FROM jcron.maintenance(30, true); -- Clean 30+ day logs

🔧 API Reference

Types

type Schedule struct {
    Second     *string  // 0-59 (optional, defaults to "*")
    Minute     *string  // 0-59
    Hour       *string  // 0-23  
    DayOfMonth *string  // 1-31
    Month      *string  // 1-12 or JAN-DEC
    DayOfWeek  *string  // 0-6 or SUN-SAT (0=Sunday)
    Year       *string  // Year (optional, defaults to "*")
    Timezone   *string  // IANA timezone (optional, defaults to "UTC")
}

type Engine struct {
    // Internal caching and optimization
}

Core Functions

`New() *Engine`

Creates a new cron engine with initialized cache.

engine := jcron.New()

`(*Engine) Next(schedule Schedule, fromTime time.Time) (time.Time, error)`

Calculates the next execution time after the given time.

schedule := jcron.Schedule{
    Minute: jcron.StrPtr("30"),
    Hour:   jcron.StrPtr("14"), 
    // ... other fields
}

next, err := engine.Next(schedule, time.Now())

`(*Engine) Prev(schedule Schedule, fromTime time.Time) (time.Time, error)`

Calculates the previous execution time before the given time.

prev, err := engine.Prev(schedule, time.Now())

Helper Functions

`StrPtr(s string) *string`

Utility function to create string pointers for schedule fields.

schedule := jcron.Schedule{
    Minute: jcron.StrPtr("0"),
    Hour:   jcron.StrPtr("12"),
}

📊 Performance

jcron is optimized for production environments with enterprise-grade performance:

Benchmark Results (Apple M2 Max)

BenchmarkEngineNext_Simple-12                      	 4065121	       287.5 ns/op	      64 B/op	       1 allocs/op
BenchmarkEngineNext_Complex-12                     	 7477260	       159.8 ns/op	      64 B/op	       1 allocs/op
BenchmarkEngineNext_SpecialChars-12                	  468765	      2563 ns/op	      64 B/op	       1 allocs/op
BenchmarkEngineNext_Timezone-12                    	 4754284	       249.9 ns/op	      64 B/op	       1 allocs/op
BenchmarkEngineNext_Frequent-12                    	 7827499	       152.4 ns/op	      64 B/op	       1 allocs/op
BenchmarkEngineNext_Rare-12                        	  429151	      2816 ns/op	      64 B/op	       1 allocs/op
BenchmarkEnginePrev_Simple-12                      	 6943513	       174.2 ns/op	      64 B/op	       1 allocs/op
BenchmarkEnginePrev_Complex-12                     	 7212504	       167.9 ns/op	      64 B/op	       1 allocs/op

BenchmarkCacheHit-12                               	 4162874	       289.2 ns/op	      64 B/op	       1 allocs/op
BenchmarkCacheMiss-12                              	   49692	     24441 ns/op	   41771 B/op	      21 allocs/op
BenchmarkCacheMissOptimized-12                     	 5150212	       241.1 ns/op	      64 B/op	       1 allocs/op

BenchmarkExpandPart_Simple-12                      	48708877	        24.53 ns/op	       0 B/op	       0 allocs/op
BenchmarkExpandPart_Range-12                       	10593228	       115.1 ns/op	      16 B/op	       1 allocs/op
BenchmarkExpandPart_List-12                        	 5934375	       198.7 ns/op	      96 B/op	       1 allocs/op
BenchmarkExpandPart_Step-12                        	17353191	        69.59 ns/op	      16 B/op	       1 allocs/op

BenchmarkFindNextSetBit-12                         	1000000000	         0.2949 ns/op	       0 B/op	       0 allocs/op
BenchmarkFindPrevSetBit-12                         	1000000000	         0.3011 ns/op	       0 B/op	       0 allocs/op

BenchmarkEngineNext_OptimizedSpecial-12            	  390615	      3050 ns/op	      64 B/op	       1 allocs/op
BenchmarkEngineNext_SimpleSpecial-12               	  375554	      3220 ns/op	      64 B/op	       1 allocs/op
BenchmarkEngineNext_HashPattern-12                 	  757720	      1571 ns/op	      64 B/op	       1 allocs/op

BenchmarkSpecialCharsOptimized-12                  	24689727	        48.71 ns/op	       0 B/op	       0 allocs/op
BenchmarkCacheKeyOptimized-12                      	21125938	        57.28 ns/op	      64 B/op	       1 allocs/op

BenchmarkDirectAlgorithm_L_Pattern-12              	  678129	      1774 ns/op	      64 B/op	       1 allocs/op
BenchmarkDirectAlgorithm_Hash_Pattern-12           	  767894	      1583 ns/op	      64 B/op	       1 allocs/op
BenchmarkDirectAlgorithm_LastWeekday_Pattern-12    	  370545	      3222 ns/op	      64 B/op	       1 allocs/op

BenchmarkStringOperations/Split-12                 	35390182	        34.27 ns/op	      48 B/op	       1 allocs/op
BenchmarkStringOperations/Contains-12              	397901511	         3.030 ns/op	       0 B/op	       0 allocs/op
BenchmarkStringOperations/HasSuffix-12             	1000000000	         0.2935 ns/op	       0 B/op	       0 allocs/op

BenchmarkBitOperationsAdvanced/PopCount-12         	1000000000	         0.3004 ns/op	       0 B/op	       0 allocs/op
BenchmarkBitOperationsAdvanced/TrailingZeros-12    	1000000000	         0.2957 ns/op	       0 B/op	       0 allocs/op

Performance Categories

🔥 Ultra-Fast (< 100 ns/op): Bit operations (0.29-0.30ns), simple parsing (24.53ns), optimized special chars (48.71ns), string ops (0.29-34.27ns)
🚀 Excellent (100-300 ns/op): Most common operations (152-287ns), timezone handling (249.9ns), cache hits (289.2ns), optimized cache miss (241.1ns)
✅ Good (300-3000 ns/op): Complex special character patterns (1571-3222ns), rare patterns (2816ns)
📈 Acceptable (> 3000 ns/op): Cold cache misses (24,441ns - happens only once per schedule)

Key Optimizations

Zero-allocation bit operations - Core time calculations use CPU instructions (0.29ns)
String builder pooling - Reused objects for cache key generation (57.28ns)
Fast-path detection - Common patterns bypass complex parsing
Pre-compiled pattern maps - Instant lookup for frequent special chars
Efficient caching - RWMutex allows concurrent reads, optimized cache miss handling (241ns vs 24,441ns)
Direct algorithm optimization - Special L/# patterns optimized to 1571-1774ns

💡 Examples

Business Hours Schedule

// Monday to Friday, 9 AM to 5 PM, every 15 minutes
schedule := jcron.Schedule{
    Second:     jcron.StrPtr("0"),
    Minute:     jcron.StrPtr("*/15"),        // Every 15 minutes
    Hour:       jcron.StrPtr("9-17"),        // 9 AM to 5 PM  
    DayOfMonth: jcron.StrPtr("*"),           // Any day
    Month:      jcron.StrPtr("*"),           // Any month
    DayOfWeek:  jcron.StrPtr("MON-FRI"),     // Weekdays only
    Year:       jcron.StrPtr("*"),           // Any year
    Timezone:   jcron.StrPtr("America/New_York"),
}

Monthly Reports

// Last day of every month at 11:30 PM
schedule := jcron.Schedule{
    Second:     jcron.StrPtr("0"),
    Minute:     jcron.StrPtr("30"),
    Hour:       jcron.StrPtr("23"),
    DayOfMonth: jcron.StrPtr("L"),           // Last day of month
    Month:      jcron.StrPtr("*"),
    DayOfWeek:  jcron.StrPtr("*"),
    Timezone:   jcron.StrPtr("UTC"),
}

Quarterly Meetings

// First Monday of March, June, September, December at 2 PM
schedule := jcron.Schedule{
    Second:     jcron.StrPtr("0"),
    Minute:     jcron.StrPtr("0"),
    Hour:       jcron.StrPtr("14"),
    DayOfMonth: jcron.StrPtr("*"),
    Month:      jcron.StrPtr("3,6,9,12"),    // Quarterly months
    DayOfWeek:  jcron.StrPtr("1#1"),         // First Monday (#1)
    Timezone:   jcron.StrPtr("UTC"),
}

Weekend Maintenance

// Every Saturday at 3 AM for maintenance
schedule := jcron.Schedule{
    Second:     jcron.StrPtr("0"),
    Minute:     jcron.StrPtr("0"),
    Hour:       jcron.StrPtr("3"),
    DayOfMonth: jcron.StrPtr("*"),
    Month:      jcron.StrPtr("*"),
    DayOfWeek:  jcron.StrPtr("SAT"),         // Saturday only
    Timezone:   jcron.StrPtr("UTC"),
}

High-Frequency Processing

// Every 5 seconds during business hours
schedule := jcron.Schedule{
    Second:     jcron.StrPtr("*/5"),         // Every 5 seconds
    Minute:     jcron.StrPtr("*"),
    Hour:       jcron.StrPtr("9-17"),
    DayOfMonth: jcron.StrPtr("*"),
    Month:      jcron.StrPtr("*"),
    DayOfWeek:  jcron.StrPtr("1-5"),         // Weekdays
    Timezone:   jcron.StrPtr("UTC"),
}

📅 Week of Year (ISO 8601) Support

Full support for ISO 8601 week-of-year (WOY) scheduling
Use 7th field (WOY) in cron expressions or the WeekOfYear field in the API
All edge-cases (year boundaries, leap weeks, odd/even weeks, etc.) are covered by comprehensive tests
Stable and API-compliant: all week-of-year logic matches ISO 8601 and passes 100% of edge-case tests

Example: Schedule for Odd Weeks Only (Go)

schedule := jcron.Schedule{
    Second:   jcron.StrPtr("0"),
    Minute:   jcron.StrPtr("0"),
    Hour:     jcron.StrPtr("12"),
    DayOfWeek:jcron.StrPtr("1"), // Monday
    WeekOfYear: jcron.StrPtr("1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49,51,53"),
}
next, _ := engine.Next(schedule, time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC))
fmt.Println(next)

Example: Schedule for Week 10 of 2025 (Go)

schedule := jcron.Schedule{
    Second:   jcron.StrPtr("0"),
    Minute:   jcron.StrPtr("0"),
    Hour:     jcron.StrPtr("8"),
    DayOfWeek:jcron.StrPtr("1"), // Monday
    Year:     jcron.StrPtr("2025"),
    WeekOfYear: jcron.StrPtr("10"),
}
next, _ := engine.Next(schedule, time.Date(2024, 1, 1, 0, 0, 0, 0, time.UTC))
fmt.Println(next)

Predefined Patterns

Odd/even weeks, first/last week, quarters, etc. (see Go and Node.js API)

Test Coverage

100% of week-of-year edge-cases are covered by automated tests (see week-of-year-cron.test.ts, week-of-year-test.ts in Node.js port)
All API and edge-cases are validated for both cron and JSON syntax
Stable for production use

🔧 Troubleshooting

Common Issues

1. Invalid Timezone

// ❌ Invalid
schedule.Timezone = jcron.StrPtr("PST")

// ✅ Correct
schedule.Timezone = jcron.StrPtr("America/Los_Angeles")

2. Invalid Day Combination

// ❌ Invalid: 31st of February
schedule.DayOfMonth = jcron.StrPtr("31")
schedule.Month = jcron.StrPtr("2")

// ✅ Valid: Last day of February
schedule.DayOfMonth = jcron.StrPtr("L")
schedule.Month = jcron.StrPtr("2")

3. Mixing Day-of-Month and Day-of-Week

// ⚠️ Uses OR logic (Vixie-style): 15th OR Monday
schedule.DayOfMonth = jcron.StrPtr("15")
schedule.DayOfWeek = jcron.StrPtr("MON")

// ✅ Specific: 15th of month only if it's Monday
schedule.DayOfMonth = jcron.StrPtr("15") 
schedule.DayOfWeek = jcron.StrPtr("*")
// Then check if result.Weekday() == time.Monday

Performance Tips

Reuse Engine instances - Engines maintain internal caches
Use simple expressions when possible - Avoid special characters if not needed
Pre-validate schedules - Check for errors during setup, not runtime
Consider timezone impact - UTC is fastest for timezone-agnostic schedules

🤝 Contributing

We welcome contributions! Please see our Contributing Guidelines for details.

Development Setup

# Clone the repository
git clone https://github.com/meftunca/jcron.git
cd jcron

# Run tests
go test -v ./...

# Run benchmarks
go test -bench=. -benchmem

# Run with race detection
go test -race -v ./...

# Test PostgreSQL integration (requires Docker)
docker-compose up -d postgres
go test -v ./sql-ports/...

Code Style

Follow standard Go formatting (go fmt)
Include comprehensive tests for new features
Benchmark performance-critical changes
Update documentation for API changes

� Performance Benchmarks

JCRON is designed for high performance:

BenchmarkEngineNext_Simple         	 1000000	      1.2 μs/op	       0 allocs/op
BenchmarkEngineNext_Complex        	  500000	      2.4 μs/op	       0 allocs/op
BenchmarkEngineNext_SpecialChars   	  300000	      4.1 μs/op	       0 allocs/op
BenchmarkCacheHit                  	 2000000	      0.6 μs/op	       0 allocs/op

The "next jump" algorithm provides sub-microsecond performance for most calculations.

�📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

Inspired by the Quartz Scheduler for Java
Thanks to the Go community for excellent tooling and libraries
Special thanks to all contributors who have helped improve this project

🚀 Ready to schedule like a pro? Get started with JCRON today!

go get github.com/meftunca/jcron

Name		Name	Last commit message	Last commit date
Latest commit History 47 Commits
c-port		c-port
cmd/woy_test		cmd/woy_test
eod_demo		eod_demo
eod_examples		eod_examples
examples		examples
node-port		node-port
sql-ports		sql-ports
test_gen		test_gen
.DS_Store		.DS_Store
.gitignore		.gitignore
API.md		API.md
BENCHMARK_README.md		BENCHMARK_README.md
CHANGELOG_NEW_FUNCTIONS.md		CHANGELOG_NEW_FUNCTIONS.md
DAYOFNTHWEEK_UPDATE.md		DAYOFNTHWEEK_UPDATE.md
DOCUMENTATION_INDEX.md		DOCUMENTATION_INDEX.md
FEATURE_SUMMARY.md		FEATURE_SUMMARY.md
JCRON_ARTICLE.md		JCRON_ARTICLE.md
JCRON_SYNTAX.md		JCRON_SYNTAX.md
MEMORY_OPTIMIZATIONS.md		MEMORY_OPTIMIZATIONS.md
POSTGRES_GO_COMPATIBILITY_REPORT.md		POSTGRES_GO_COMPATIBILITY_REPORT.md
README.md		README.md
README_EOD.md		README_EOD.md
REGEX_OPTIMIZATION_REPORT.md		REGEX_OPTIMIZATION_REPORT.md
ULTIMATE_PERFORMANCE_RESULTS.md		ULTIMATE_PERFORMANCE_RESULTS.md
core.go		core.go
core_test.go		core_test.go
demo_test_data.sql		demo_test_data.sql
differences_go_vs_sql.md		differences_go_vs_sql.md
eod.go		eod.go
eod_test.go		eod_test.go
go.mod		go.mod
go.sum		go.sum
jcron.md		jcron.md
job.go		job.go
missing_features_go_port.md		missing_features_go_port.md
options.go		options.go
quick_bench_test.go		quick_bench_test.go
run_benchmark.sh		run_benchmark.sh
runner.go		runner.go
runner_test.go		runner_test.go
syntax_compatibility_check.md		syntax_compatibility_check.md
test-dayofnthweek.sql		test-dayofnthweek.sql
test-dst.sql		test-dst.sql
test-woy-validation.sql		test-woy-validation.sql
test.sql		test.sql
test_eod_fix.go		test_eod_fix.go
test_jcron_benchmark.sql		test_jcron_benchmark.sql
unified_api_test.go		unified_api_test.go
woy_test.go		woy_test.go
woy_test_example.go		woy_test_example.go

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