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//go:build !functional
package sarama
import (
"context"
"fmt"
)
type exampleConsumerGroupHandler struct{}
func (exampleConsumerGroupHandler) Setup(_ ConsumerGroupSession) error { return nil }
func (exampleConsumerGroupHandler) Cleanup(_ ConsumerGroupSession) error { return nil }
func (h exampleConsumerGroupHandler) ConsumeClaim(sess ConsumerGroupSession, claim ConsumerGroupClaim) error {
for msg := range claim.Messages() {
fmt.Printf("Message topic:%q partition:%d offset:%d\n", msg.Topic, msg.Partition, msg.Offset)
sess.MarkMessage(msg, "")
}
return nil
}
func ExampleConsumerGroup() {
config := NewTestConfig()
config.Version = V2_0_0_0 // specify appropriate version
config.Consumer.Return.Errors = true
group, err := NewConsumerGroup([]string{"localhost:9092"}, "my-group", config)
if err != nil {
panic(err)
}
defer func() { _ = group.Close() }()
// Track errors
go func() {
for err := range group.Errors() {
fmt.Println("ERROR", err)
}
}()
// Iterate over consumer sessions.
ctx := context.Background()
for {
topics := []string{"my-topic"}
handler := exampleConsumerGroupHandler{}
// `Consume` should be called inside an infinite loop, when a
// server-side rebalance happens, the consumer session will need to be
// recreated to get the new claims
err := group.Consume(ctx, topics, handler)
if err != nil {
panic(err)
}
}
}
|
