Does anyone know why Spring Integration (AMQP 1.3.5) requires the correlation-id to be a byte array? Rabbit's AMQP-Client 3.3.5 takes a String for the correlation-id in the AMQP.BasicProperties class. Doesn't Spring need to convert the byte array to this String at some point? We're finding that the correlation-id in the message Rabbit sends is still a byte array, and is never converted to a String. Any insight?
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Good question, I have no insight; it was before my time on the project and it's a day one issue.
Spring AMQP converts the
byte[]to a String inDefaultMessagePropertiesConverter(outbound); invoked by theRabbitTemplateusingUTF-8by default. The resulting string is added to theBasicProperties.On the listener container (inbound) side, UTF-8 is used unconditionally.
The rabbit client converts to
byte[]when writing to the wire (inValueWriter.writeShortStr()), unconditionally using charsetUTF-8.So, unless you change the charset in
RabbitTemplate(which would be bad), it's a no-op (but unnecessary if you already have aString).I can only speculate that, since
MessagePropertiesis an abstraction (and not tied to RabbitMQ), some other client had it as abyte[]when the abstraction was being designed.Since we only have a rabbitmq implementation, I wouldn't be averse to adding an optimization to the abstraction to avoid the unnecessary conversion.
Feel free to open an Improvement JIRA Issue and we'll take a look at it for the upcoming 1.5 release.