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consumer.go
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consumer.go
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package core
import (
"sync"
"github.com/apache/pulsar-client-go/pulsar"
"github.com/goexl/gox"
"github.com/goexl/pulsar/internal/builder"
"github.com/goexl/pulsar/internal/callback"
"github.com/goexl/pulsar/internal/param"
)
type Consumer[T any] struct {
get callback.GetClient
param *param.Consumer[T]
consumers *sync.Map
_ gox.CannotCopy
}
func NewConsumer[T any](param *param.Consumer[T], get callback.GetClient) *Consumer[T] {
return &Consumer[T]{
param: param,
get: get,
consumers: new(sync.Map),
}
}
func (c *Consumer[T]) Handle() *builder.Handle[T] {
return builder.NewHandle[T](c.getConsumer)
}
func (c *Consumer[T]) getConsumer(config *param.Consumer[T]) (consumer pulsar.Consumer, err error) {
if client, ge := c.get(config.Connection); nil != ge {
err = ge
} else if cached, ok := c.consumers.Load(config.Key()); ok {
consumer = cached.(pulsar.Consumer)
} else {
consumer, err = c.createConsumer(client, config)
}
return
}
func (c *Consumer[T]) createConsumer(
client pulsar.Client,
config *param.Consumer[T],
) (consumer pulsar.Consumer, err error) {
options := pulsar.ConsumerOptions{}
options.Name = config.Name
options.Topics = config.Topics
options.TopicsPattern = config.Pattern
consumer, err = client.Subscribe(options)
return
}