org.eclipse.microprofile.reactive.messaging

Annotation Type OnOverflow

@Retention(value=RUNTIME)
 @Target(value={METHOD,CONSTRUCTOR,FIELD,PARAMETER})
public @interface OnOverflow

Allows configuring the back pressure policy on injected Emitter:

 {
     @code
     @Channel("channel")
     @OnOverflow(value = OnOverflow.Strategy.BUFFER, bufferSize = 256)
     Emitter<String> emitter;
 }
 

When not used, a OnOverflow.Strategy.BUFFER strategy is used with a buffer limited to 128 elements.

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
OnOverflow.Strategy	value

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
long	bufferSize

Element Detail

value

public abstract OnOverflow.Strategy value

Returns:

the name of the strategy to be used on overflow.

bufferSize

public abstract long bufferSize

Returns:

the size of the buffer when OnOverflow.Strategy.BUFFER is used. If not set and if the OnOverflow.Strategy.BUFFER strategy is used, the buffer size will be defaulted to the value of the config property mp.messaging.emitter.defult-buffer-size.

Default:

0L