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examples_test.go
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examples_test.go
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package cluster_test
import (
"fmt"
"log"
"os"
"os/signal"
cluster "github.com/bsm/sarama-cluster"
)
// This example shows how to use the consumer can read messages
// from a multiple topics.
func ExampleConsumer() {
// init (custom) config, enable errors and notifications
config := cluster.NewConfig()
config.Consumer.Return.Errors = true
config.Group.Return.Notifications = true
// init consumer
brokers := []string{"127.0.0.1:9092"}
topics := []string{"my_topic", "other_topic"}
consumer, err := cluster.NewConsumer(brokers, "my-consumer-group", topics, config)
if err != nil {
panic(err)
}
defer consumer.Close()
// trap SIGINT to trigger a shutdown.
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt)
// consume messages, watch errors and notifications
for {
select {
case msg, more := <-consumer.Messages():
if more {
fmt.Fprintf(os.Stdout, "%s/%d/%d\t%s\t%s\n", msg.Topic, msg.Partition, msg.Offset, msg.Key, msg.Value)
consumer.MarkOffset(msg, "") // mark message as processed
}
case err, more := <-consumer.Errors():
if more {
log.Printf("Error: %s\n", err.Error())
}
case ntf, more := <-consumer.Notifications():
if more {
log.Printf("Rebalanced: %+v\n", ntf)
}
case <-signals:
return
}
}
}