RabbitMQ配置之mandatory

在SpringBoot的RabbitMQ配置中,有如下一项:
spring.rabbitmq.template.mandatory = true

官方注释:

Enable mandatory messages. If a mandatory message cannot be routed to a queue by the server, it will return an unroutable message with a Return method.

大意为:开启强制消息投递(mandatory为设置为true),但消息未被路由至任何一个queue,则回退一条消息到RabbitTemplate.ReturnCallback中的returnedMessage方法:

public interface ReturnCallback {
    /**
    * Returned message callback.
    * @param message the returned message.
    * @param replyCode the reply code.
    * @param replyText the reply text.
    * @param exchange the exchange.
    * @param routingKey the routing key.
    */
    void returnedMessage(Message message, int replyCode, String replyText,
                 String exchange, String routingKey);
}

浏览RabbitAutoConfiguration发现如下代码:

private boolean determineMandatoryFlag() {
    Boolean mandatory = this.properties.getTemplate().getMandatory();
    return (mandatory != null ? mandatory : this.properties.isPublisherReturns());
}

如果设置了mandatory参数,则直接取值;如若mandatory参数为空,则取之于否起开了消息回退

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