org.springframework.cloud.stream.binder.kafka

Class KafkaExpressionEvaluatingInterceptor

java.lang.Object

org.springframework.cloud.stream.binder.kafka.KafkaExpressionEvaluatingInterceptor

All Implemented Interfaces:

org.springframework.messaging.support.ChannelInterceptor

public class KafkaExpressionEvaluatingInterceptor
extends Object
implements org.springframework.messaging.support.ChannelInterceptor

Interceptor to evaluate expressions for outbound messages before serialization.

Since:

3.0

Author:

Gary Russell

Field Summary

Fields

Modifier and Type	Field and Description
static String	MESSAGE_KEY_HEADER Name for the evaluated message key header.

Constructor Summary

Constructors

Constructor and Description
KafkaExpressionEvaluatingInterceptor(org.springframework.expression.Expression messageKeyExpression, org.springframework.expression.EvaluationContext evaluationContext) Construct an instance with the provided expressions and evaluation context.

Method Summary

Modifier and Type	Method and Description
org.springframework.messaging.Message<?>	preSend(org.springframework.messaging.Message<?> message, org.springframework.messaging.MessageChannel channel)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.springframework.messaging.support.ChannelInterceptor

afterReceiveCompletion, afterSendCompletion, postReceive, postSend, preReceive

Field Detail

MESSAGE_KEY_HEADER

public static final String MESSAGE_KEY_HEADER

Name for the evaluated message key header.

See Also:

Constant Field Values

Constructor Detail

KafkaExpressionEvaluatingInterceptor

public KafkaExpressionEvaluatingInterceptor(org.springframework.expression.Expression messageKeyExpression,
                                            org.springframework.expression.EvaluationContext evaluationContext)

Construct an instance with the provided expressions and evaluation context. At least one expression muse be non-null.

Parameters:

messageKeyExpression - the routing key expression.

evaluationContext - the evaluation context.

Method Detail

preSend

public org.springframework.messaging.Message<?> preSend(org.springframework.messaging.Message<?> message,
                                                        org.springframework.messaging.MessageChannel channel)

Specified by:

preSend in interface org.springframework.messaging.support.ChannelInterceptor