红帽全球峰会137.3.4. peek 示例：
from("direct:peek")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.PEEK))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
from("direct:peek")
.setHeader(HazelcastConstants.OPERATION, constant(HazelcastOperation.PEEK))
.toF("hazelcast:%sbar", HazelcastConstants.QUEUE_PREFIX);
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