1 files changed, 63 insertions, 0 deletions
diff --git a/weed/util/limited_async_pool_test.go b/weed/util/limited_async_pool_test.go
new file mode 100644
index 000000000..935b158da
--- /dev/null
+++ b/weed/util/limited_async_pool_test.go
@@ -0,0 +1,63 @@
+package util
+
+import (
+	"fmt"
+	"github.com/stretchr/testify/assert"
+	"sort"
+	"testing"
+	"time"
+)
+
+func TestAsyncPool(t *testing.T) {
+	p := NewLimitedAsyncExecutor(3)
+	var results []Future
+
+	results = append(results, p.Execute(FirstFunc))
+	results = append(results, p.Execute(SecondFunc))
+	results = append(results, p.Execute(ThirdFunc))
+	results = append(results, p.Execute(FourthFunc))
+	results = append(results, p.Execute(FifthFunc))
+
+	var sorted_results []int
+	for _, r := range results {
+		x := r.Await().(int)
+		println(x)
+		sorted_results = append(sorted_results, x)
+	}
+	assert.True(t, sort.IntsAreSorted(sorted_results), "results should be sorted")
+}
+
+func FirstFunc() any {
+	fmt.Println("-- Executing first function --")
+	time.Sleep(70 * time.Millisecond)
+	fmt.Println("-- First Function finished --")
+	return 1
+}
+
+func SecondFunc() any {
+	fmt.Println("-- Executing second function --")
+	time.Sleep(50 * time.Millisecond)
+	fmt.Println("-- Second Function finished --")
+	return 2
+}
+
+func ThirdFunc() any {
+	fmt.Println("-- Executing third function --")
+	time.Sleep(20 * time.Millisecond)
+	fmt.Println("-- Third Function finished --")
+	return 3
+}
+
+func FourthFunc() any {
+	fmt.Println("-- Executing fourth function --")
+	time.Sleep(100 * time.Millisecond)
+	fmt.Println("-- Fourth Function finished --")
+	return 4
+}
+
+func FifthFunc() any {
+	fmt.Println("-- Executing fifth function --")
+	time.Sleep(40 * time.Millisecond)
+	fmt.Println("-- Fourth fifth finished --")
+	return 5
+}