| /* |
| * 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" |
| |
| rmq_client "github.com/apache/rocketmq-clients/golang" |
| "github.com/apache/rocketmq-clients/golang/v5/credentials" |
| ) |
| |
| const ( |
| Topic = "xxxxxx" |
| ConsumerGroup = "xxxxxx" |
| Endpoint = "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") |
| rmq_client.ResetLogger() |
| // new simpleConsumer instance |
| simpleConsumer, err := rmq_client.NewSimpleConsumer(&rmq_client.Config{ |
| Endpoint: Endpoint, |
| ConsumerGroup: ConsumerGroup, |
| Credentials: &credentials.SessionCredentials{ |
| AccessKey: AccessKey, |
| AccessSecret: SecretKey, |
| }, |
| }, |
| rmq_client.WithAwaitDuration(awaitDuration), |
| rmq_client.WithSubscriptionExpressions(map[string]*rmq_client.FilterExpression{ |
| Topic: rmq_client.SUB_ALL, |
| }), |
| ) |
| if err != nil { |
| log.Fatal(err) |
| } |
| // start simpleConsumer |
| err = simpleConsumer.Start() |
| if err != nil { |
| log.Fatal(err) |
| } |
| // graceful stop simpleConsumer |
| defer simpleConsumer.GracefulStop() |
| |
| go func() { |
| for { |
| fmt.Println("start receive 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) |
| } |