horizonzy opened a new issue, #16358:
URL: https://github.com/apache/pulsar/issues/16358
**Describe the bug**
Now the method `hasMessageAvailable` just is announced in ConsumerImpl and
MultiConsumerImpl.
If we want to check is there message available, we should transfer Consumer
to ConsumerImpl or MultiConsumerImpl,
then invoke hasMessageAvailable like below:
```
if (consumer instanceof ConsumerImpl<RubbishInfo>) {
return ((ConsumerImpl<RubbishInfo>)
consumer).hasMessageAvailable();
} else if (consumer instanceof
MultiTopicsConsumerImpl<RubbishInfo>) {
return ((MultiTopicsConsumerImpl<RubbishInfo>)
consumer).hasMessageAvailable();
}
```
Maybe we can make method `hasMessageAvailable` to Consumer.
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