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consumer.go
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consumer.go
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package rocketmq5Kit
import (
rmq_client "github.com/apache/rocketmq-clients/golang/v5"
"github.com/richelieu42/chimera/v2/src/core/errorKit"
"github.com/richelieu42/chimera/v2/src/core/strKit"
"time"
)
const (
// AwaitDuration (consumer创建实例时用到) maximum waiting time for receive func
AwaitDuration = time.Second * 5
// MaxMessageNum (consumer收消息时用到) maximum number of messages received at one time
MaxMessageNum int32 = 16
// InvisibleDuration (consumer收消息时用到) InvisibleDuration should > 20s
InvisibleDuration = time.Second * 20
// receive messages in a loop
)
// NewSimpleConsumer
/*
@param logConfig 可以为nil(此时将默认输出到控制台)
@param config 不会修改传参config,因为修改的是副本
@return rmq_client.SimpleConsumer实例要手动调用 Start()!!!
*/
func NewSimpleConsumer(logConfig *LogConfig, config *rmq_client.Config, consumerGroup, topic, tag string) (rmq_client.SimpleConsumer, error) {
lock.Lock()
defer lock.Unlock()
if err := logConfig.SetLogout(); err != nil {
return nil, err
}
config, err := processConfig(config)
if err != nil {
return nil, err
}
if strKit.IsEmpty(consumerGroup) {
return nil, errorKit.New("consumerGroup is empty")
}
if strKit.IsEmpty(topic) {
return nil, errorKit.New("topic is empty")
}
tag = strKit.EmptyToDefault(tag, "*")
config.ConsumerGroup = consumerGroup
return rmq_client.NewSimpleConsumer(config,
rmq_client.WithAwaitDuration(AwaitDuration),
rmq_client.WithSubscriptionExpressions(map[string]*rmq_client.FilterExpression{
topic: rmq_client.NewFilterExpression(tag),
}),
)
}