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|
package sarama
import (
"sync"
"testing"
"time"
"github.com/stretchr/testify/require"
)
func TestMetadataRefresh(t *testing.T) {
stepRefresh := make(chan struct{})
refresh := newMetadataRefresh(func(topics []string) error {
<-stepRefresh
return nil
})
ch, queued := refresh.refreshOrQueue([]string{"topic1"})
if queued {
t.Errorf("It's the first call, it should not be queued")
}
ch2, queued := refresh.refreshOrQueue([]string{"topic2", "topic3"})
if !queued {
t.Errorf("This one is requesting different topics, it should be queued")
}
ch3, queued := refresh.refreshOrQueue([]string{"topic3"})
if !queued {
t.Errorf("This one is requesting the same topics as the second one, it should be queued")
}
ch4, queued := refresh.refreshOrQueue([]string{"topic4"})
if !queued {
t.Errorf("This one is requesting different topics, it should be queued too")
}
ch5, queued := refresh.refreshOrQueue([]string{"topic1"})
if queued {
t.Errorf("Same topics as the first call, piggy backing on that call, so it's not queued")
}
stepRefresh <- struct{}{}
require.NoError(t, <-ch)
require.NoError(t, <-ch5)
require.NoError(t, <-ch2)
require.NoError(t, <-ch3)
require.NoError(t, <-ch4)
}
func TestMetadataRefreshConcurrency(t *testing.T) {
var firstRefreshChans []chan error
var lock sync.Mutex
stepRefresh := make(chan struct{})
refresh := newMetadataRefresh(func(topics []string) error {
<-stepRefresh
return nil
})
ch, queued := refresh.refreshOrQueue([]string{"topic1"})
firstRefreshChans = append(firstRefreshChans, ch)
if queued {
t.Errorf("First call, should start a refresh")
}
var wg sync.WaitGroup
for i := 0; i < 1000; i++ {
wg.Add(1)
time.Sleep(time.Millisecond)
go func() {
defer wg.Done()
ch, refreshQueued := refresh.refreshOrQueue([]string{"topic1"})
if refreshQueued {
t.Errorf("This one should not be queued: they are all requesting the topic that's already started")
}
lock.Lock()
firstRefreshChans = append(firstRefreshChans, ch)
lock.Unlock()
}()
}
wg.Wait()
// We have now queued all the refreshes, and they're all blocked with the first one.
stepRefresh <- struct{}{}
// Now they are all finished, we can pull from the channels
for _, ch := range firstRefreshChans {
require.NoError(t, <-ch)
}
ch, queued = refresh.refreshOrQueue([]string{"topic2", "topic3"})
if queued {
t.Errorf("This one should not be queued: no refresh is ongoing")
}
ch2, queued := refresh.refreshOrQueue([]string{"topic3", "topic4"})
if !queued {
t.Errorf("But now there is a refresh ongoing, so this one should be queued")
}
stepRefresh <- struct{}{}
require.NoError(t, <-ch)
require.NoError(t, <-ch2)
}
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