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priority_lock_test.go
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priority_lock_test.go
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package priority_lock
import (
"fmt"
"log"
"testing"
"time"
"sync"
"os"
)
var mockData []string
var logger = log.New(os.Stdout, "", 0)
func lowPriorityRoutine(idx int, wg sync.WaitGroup, l PriorityLock, sleepDuration time.Duration, holdDuration time.Duration) {
wg.Add(1)
defer wg.Done()
if sleepDuration > 0 {
time.Sleep(sleepDuration)
}
l.Lock()
defer l.Unlock()
logger.Println(fmt.Sprintf("[%d] [idx:%d] Acquired low priority lock", time.Now().UnixNano(), idx))
mockData = append(mockData, "lo")
if holdDuration > 0 {
time.Sleep(holdDuration)
}
logger.Println(fmt.Sprintf("[%d] [idx:%d] Releasing low priority lock", time.Now().UnixNano(), idx))
}
func highPriorityRoutine(idx int, wg sync.WaitGroup, l PriorityLock, sleepDuration time.Duration, holdDuration time.Duration) {
wg.Add(1)
defer wg.Done()
if sleepDuration > 0 {
time.Sleep(sleepDuration)
}
l.HighPriorityLock()
defer l.HighPriorityUnlock()
mockData = append(mockData, "hi")
logger.Println(fmt.Sprintf("[%d] [idx:%d] Acquired high priority lock", time.Now().UnixNano(), idx))
if holdDuration > 0 {
time.Sleep(holdDuration)
}
logger.Println(fmt.Sprintf("[%d] [idx:%d] Releasing high priority lock", time.Now().UnixNano(), idx))
}
type testCaseRoutine struct {
lockType string
sleepDuration time.Duration
holdDuration time.Duration
}
var defaultSleepTime = time.Duration(30) * time.Nanosecond
func TestPriorityPreferenceLock(t *testing.T) {
lock := NewPriorityPreferenceLock()
wg := sync.WaitGroup{}
notifyChan := make(chan struct{}, 1)
defer close(notifyChan)
runners := []testCaseRoutine{
{lockType: "hi", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "hi", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "hi", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "hi", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "hi", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
{lockType: "lo", sleepDuration: defaultSleepTime, holdDuration: defaultSleepTime},
}
for idx, runner := range runners {
switch runner.lockType {
case "lo":
go lowPriorityRoutine(idx, wg, lock, runner.sleepDuration, runner.holdDuration)
case "hi":
go highPriorityRoutine(idx, wg, lock, runner.sleepDuration, runner.holdDuration)
}
}
go func(c chan struct{}) {
wg.Wait()
c <- struct{}{}
}(notifyChan)
select {
case <-notifyChan:
// all unlocked, continue
time.Sleep(time.Millisecond*100) // allow logs to flush
case <-time.After(time.Second * 10):
t.Fatal("Did not complete locking simulation withing timeout")
}
// check all data operations succeeded
if len(mockData) != len(runners) {
t.Fatal(fmt.Sprintf("Expected at least %d entries in the mock data", len(runners)))
}
// Check ordering is biased hi - note: some lo's will happen before given the test case
maxHighIdx := 7 // based on sampling
lastHighIdx := 0
for i, v := range mockData {
if v == "hi" {
lastHighIdx = i
}
}
log.Println(fmt.Sprintf("lastHighIdx: %d", lastHighIdx))
if lastHighIdx > maxHighIdx {
t.Fatal(fmt.Sprintf("lastHighIdx should be <= %d but was %d", maxHighIdx, lastHighIdx))
}
}