PubrelOutboundInterceptor (HiveMQ Extension SDK 4.28.0 API)

All Superinterfaces:

Interceptor

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 PubrelOutboundInterceptor
extends Interceptor
```
Interface for the outbound PUBREL interception.
Interceptors are always called by the same Thread for all messages from the same client.
If the same instance is shared between multiple clients it can be called in different Threads and must therefore be thread-safe.
When the method onOutboundPubrel(PubrelOutboundInput, PubrelOutboundOutput) throws an exception or a call to PubrelOutboundOutput.async(Duration) times out with TimeoutFallback.FAILURE, HiveMQ will ignore this interceptor and will:
1. Log the exception
2. Revert the changes to the ModifiablePubrelPacket made by the interceptor
3. Call the next PubrelOutboundInterceptor or send the PUBREL to the client if no interceptor is left
Since:

4.3.0, CE 2020.1

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onOutboundPubrel(@NotNull PubrelOutboundInput pubrelOutboundInput, @NotNull PubrelOutboundOutput pubrelOutboundOutput)`	When a `PubrelOutboundInterceptor` is set through any extension, this method gets called for every outgoing PUBREL packet for any MQTT client.

- Method Detail
  - onOutboundPubrel
```
void onOutboundPubrel(@NotNull PubrelOutboundInput pubrelOutboundInput,
                      @NotNull PubrelOutboundOutput pubrelOutboundOutput)
```
    When a PubrelOutboundInterceptor is set through any extension, this method gets called for every outgoing PUBREL packet for any MQTT client.
    When the extension is enabled after HiveMQ is already running, this method will also be called for future PUBRELs for clients that are already connected.
    
    Parameters:
    
    pubrelOutboundInput - The PubrelOutboundInput parameter.
    
    pubrelOutboundOutput - The PubrelOutboundOutput parameter.
    
    Since:
    
    4.3.0, CE 2020.1