红帽全球峰会35.6. JMS-style Selector
SQS 不允许选择器，但您可以使用 Camel Filter EIP 和设置适当的 可见Timeout 来有效地达到此目的。当 SQS 分配消息时，它将等待到可见性超时，然后尝试将消息发送到不同的消费者，除非收到 DeleteMessage。默认情况下，Camel 总是在路由末尾发送 DeleteMessage，除非路由以失败告终。要实现适当的过滤，而不在成功完成路由时发送 DeleteMessage，请使用 Filter:
from("aws-sqs://MyQueue?amazonSQSClient=#client&defaultVisibilityTimeout=5000&deleteIfFiltered=false")
.filter("${header.login} == true")
.to("mock:result");
from("aws-sqs://MyQueue?amazonSQSClient=#client&defaultVisibilityTimeout=5000&deleteIfFiltered=false")
.filter("${header.login} == true")
.to("mock:result");在上面的代码中，如果交换没有适当的标头，它不会通过过滤器使其不会从 SQS 队列中删除。在 5000 miliseconds 后，信息将对其他消费者可见。
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