/
main.go
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/
main.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"context"
"fmt"
"log"
"os"
"time"
"github.com/apache/rocketmq-clients/golang"
"github.com/apache/rocketmq-clients/golang/credentials"
)
const (
Topic = "xxxxxx"
GroupName = "xxxxxx"
Endpoint = "xxxxxx"
Region = "xxxxxx"
AccessKey = "xxxxxx"
SecretKey = "xxxxxx"
)
var (
// maximum waiting time for receive func
awaitDuration = time.Second * 5
// maximum number of messages received at one time
maxMessageNum int32 = 16
// invisibleDuration should > 20s
invisibleDuration = time.Second * 20
// receive messages in a loop
)
func main() {
// log to console
os.Setenv("mq.consoleAppender.enabled", "true")
golang.ResetLogger()
// new simpleConsumer instance
simpleConsumer, err := golang.NewSimpleConsumer(&golang.Config{
Endpoint: Endpoint,
Group: GroupName,
Region: Region,
Credentials: &credentials.SessionCredentials{
AccessKey: AccessKey,
AccessSecret: SecretKey,
},
},
golang.WithAwaitDuration(awaitDuration),
golang.WithSubscriptionExpressions(map[string]*golang.FilterExpression{
Topic: golang.SUB_ALL,
}),
)
if err != nil {
log.Fatal(err)
}
// start simpleConsumer
err = simpleConsumer.Start()
if err != nil {
log.Fatal(err)
}
// gracefule stop simpleConsumer
defer simpleConsumer.GracefulStop()
go func() {
for {
fmt.Println("start recevie message")
mvs, err := simpleConsumer.Receive(context.TODO(), maxMessageNum, invisibleDuration)
if err != nil {
fmt.Println(err)
}
// ack message
for _, mv := range mvs {
simpleConsumer.Ack(context.TODO(), mv)
fmt.Println(mv)
}
fmt.Println("wait a moment")
fmt.Println()
time.Sleep(time.Second * 3)
}
}()
// run for a while
time.Sleep(time.Minute)
}