PollableSource (spring-cloud-stream 3.2.10 API)

Type Parameters:

H - the handler type to process the result of the poll.

All Known Subinterfaces:

PollableMessageSource

All Known Implementing Classes:

DefaultPollableMessageSource

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface PollableSource<H>
```
A mechanism to poll a consumer.

Since:

2.0

Author:

Gary Russell

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`boolean`	`poll(H handler)`	Poll the consumer.
`default boolean`	`poll(H handler, org.springframework.core.ParameterizedTypeReference<?> type)`	Poll the consumer and convert the payload to the type.

- Method Detail
  - poll
```
boolean poll(H handler)
```
    Poll the consumer.
    
    Parameters:
    
    handler - the handler.
    
    Returns:
    
    true if a message was handled.
  - poll
```
default boolean poll(H handler,
                     org.springframework.core.ParameterizedTypeReference<?> type)
```
    Poll the consumer and convert the payload to the type. Throw a RequeueCurrentMessageException to force the current message to be requeued in the broker (after retries are exhausted, if configured).
    
    Parameters:
    
    handler - the handler.
    
    type - the type.
    
    Returns:
    
    true if a message was handled.