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clientv3/concurrency: Expose examples close to the source-code.

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This commit is contained in:
Piotr Tabor
2020-10-06 14:19:02 +02:00
parent c5ccebf792
commit dd45d04b2d
10 changed files with 281 additions and 207 deletions
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183
tests/integration/clientv3/concurrency/example_mutex_test.go
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@ -23,49 +23,60 @@ import (
"go.etcd.io/etcd/v3/clientv3/concurrency"
)
func ExampleMutex_TryLock() {
cli, err := clientv3.New(clientv3.Config{Endpoints: endpoints})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
// create two separate sessions for lock competition
s1, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s1.Close()
m1 := concurrency.NewMutex(s1, "/my-lock")
s2, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s2.Close()
m2 := concurrency.NewMutex(s2, "/my-lock")
// acquire lock for s1
if err = m1.Lock(context.TODO()); err != nil {
log.Fatal(err)
}
func mockMutex_TryLock() {
fmt.Println("acquired lock for s1")
if err = m2.TryLock(context.TODO()); err == nil {
log.Fatal("should not acquire lock")
}
if err == concurrency.ErrLocked {
fmt.Println("cannot acquire lock for s2, as already locked in another session")
}
if err = m1.Unlock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("cannot acquire lock for s2, as already locked in another session")
fmt.Println("released lock for s1")
if err = m2.TryLock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("acquired lock for s2")
}
func ExampleMutex_TryLock() {
forUnitTestsRunInMockedContext(
mockMutex_TryLock,
func() {
cli, err := clientv3.New(clientv3.Config{Endpoints: exampleEndpoints()})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
// create two separate sessions for lock competition
s1, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s1.Close()
m1 := concurrency.NewMutex(s1, "/my-lock")
s2, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s2.Close()
m2 := concurrency.NewMutex(s2, "/my-lock")
// acquire lock for s1
if err = m1.Lock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("acquired lock for s1")
if err = m2.TryLock(context.TODO()); err == nil {
log.Fatal("should not acquire lock")
}
if err == concurrency.ErrLocked {
fmt.Println("cannot acquire lock for s2, as already locked in another session")
}
if err = m1.Unlock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("released lock for s1")
if err = m2.TryLock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("acquired lock for s2")
})
// Output:
// acquired lock for s1
@ -74,50 +85,60 @@ func ExampleMutex_TryLock() {
// acquired lock for s2
}
func ExampleMutex_Lock() {
cli, err := clientv3.New(clientv3.Config{Endpoints: endpoints})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
// create two separate sessions for lock competition
s1, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s1.Close()
m1 := concurrency.NewMutex(s1, "/my-lock/")
s2, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s2.Close()
m2 := concurrency.NewMutex(s2, "/my-lock/")
// acquire lock for s1
if err := m1.Lock(context.TODO()); err != nil {
log.Fatal(err)
}
func mockMutex_Lock() {
fmt.Println("acquired lock for s1")
m2Locked := make(chan struct{})
go func() {
defer close(m2Locked)
// wait until s1 is locks /my-lock/
if err := m2.Lock(context.TODO()); err != nil {
log.Fatal(err)
}
}()
if err := m1.Unlock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("released lock for s1")
<-m2Locked
fmt.Println("acquired lock for s2")
}
func ExampleMutex_Lock() {
forUnitTestsRunInMockedContext(
mockMutex_Lock,
func() {
cli, err := clientv3.New(clientv3.Config{Endpoints: exampleEndpoints()})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
// create two separate sessions for lock competition
s1, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s1.Close()
m1 := concurrency.NewMutex(s1, "/my-lock/")
s2, err := concurrency.NewSession(cli)
if err != nil {
log.Fatal(err)
}
defer s2.Close()
m2 := concurrency.NewMutex(s2, "/my-lock/")
// acquire lock for s1
if err := m1.Lock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("acquired lock for s1")
m2Locked := make(chan struct{})
go func() {
defer close(m2Locked)
// wait until s1 is locks /my-lock/
if err := m2.Lock(context.TODO()); err != nil {
log.Fatal(err)
}
}()
if err := m1.Unlock(context.TODO()); err != nil {
log.Fatal(err)
}
fmt.Println("released lock for s1")
<-m2Locked
fmt.Println("acquired lock for s2")
})
// Output:
// acquired lock for s1