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package pool
import (
"context"
"github.com/stretchr/testify/assert"
"log/slog"
"sync"
"sync/atomic"
"testing"
"time"
)
func newTestLogger() *slog.Logger {
return slog.New(slog.DiscardHandler)
}
func TestWorkerPoolConcurrencyLimit(test *testing.T) {
workerPool := NewWorkerPool(2, newTestLogger())
workerContext := context.Background()
var peakConcurrency atomic.Int32
var currentConcurrency atomic.Int32
var completedJobs atomic.Int32
for jobIndex := 0; jobIndex < 10; jobIndex++ {
workerPool.Submit(workerContext, func(workContext context.Context) {
current := currentConcurrency.Add(1)
for {
peak := peakConcurrency.Load()
if current <= peak || peakConcurrency.CompareAndSwap(peak, current) {
break
}
}
time.Sleep(10 * time.Millisecond)
currentConcurrency.Add(-1)
completedJobs.Add(1)
})
}
workerPool.Wait()
assert.Equal(test, int32(10), completedJobs.Load())
assert.LessOrEqual(test, peakConcurrency.Load(), int32(2))
}
func TestWorkerPoolPanicRecovery(test *testing.T) {
workerPool := NewWorkerPool(2, newTestLogger())
workerContext := context.Background()
var completedAfterPanic atomic.Bool
workerPool.Submit(workerContext, func(workContext context.Context) {
panic("intentional test panic")
})
time.Sleep(20 * time.Millisecond)
workerPool.Submit(workerContext, func(workContext context.Context) {
completedAfterPanic.Store(true)
})
workerPool.Wait()
assert.True(test, completedAfterPanic.Load())
}
func TestWorkerPoolCancelledContext(test *testing.T) {
workerPool := NewWorkerPool(1, newTestLogger())
cancelledContext, cancelFunction := context.WithCancel(context.Background())
var blockingMutex sync.Mutex
blockingMutex.Lock()
workerPool.Submit(context.Background(), func(workContext context.Context) {
blockingMutex.Lock()
defer blockingMutex.Unlock()
})
cancelFunction()
submitted := workerPool.Submit(cancelledContext, func(workContext context.Context) {})
assert.False(test, submitted)
blockingMutex.Unlock()
workerPool.Wait()
}
func TestWorkerPoolWaitBlocksUntilDone(test *testing.T) {
workerPool := NewWorkerPool(4, newTestLogger())
workerContext := context.Background()
var counter atomic.Int32
for jobIndex := 0; jobIndex < 20; jobIndex++ {
workerPool.Submit(workerContext, func(workContext context.Context) {
time.Sleep(5 * time.Millisecond)
counter.Add(1)
})
}
workerPool.Wait()
assert.Equal(test, int32(20), counter.Load())
}
func TestWorkerPoolActiveWorkerCount(test *testing.T) {
workerPool := NewWorkerPool(3, newTestLogger())
assert.Equal(test, 0, workerPool.ActiveWorkerCount())
var releaseMutex sync.Mutex
releaseMutex.Lock()
workerPool.Submit(context.Background(), func(workContext context.Context) {
releaseMutex.Lock()
defer releaseMutex.Unlock()
})
workerPool.Submit(context.Background(), func(workContext context.Context) {
releaseMutex.Lock()
defer releaseMutex.Unlock()
})
time.Sleep(20 * time.Millisecond)
assert.Equal(test, 2, workerPool.ActiveWorkerCount())
releaseMutex.Unlock()
workerPool.Wait()
}
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