红帽全球峰会142.4. 主题 consumer - from ("hazelcast-topic:foo")
主题使用者仅提供一个操作（接收）。这个组件应该会象涉及主题时支持多个消耗，因此您可以自由地拥有同一 hazelcast 主题所需的消费者。
fromF("hazelcast-%sfoo", HazelcastConstants.TOPIC_PREFIX)
.choice()
.when(header(HazelcastConstants.LISTENER_ACTION).isEqualTo(HazelcastConstants.RECEIVED))
.log("...message received")
.otherwise()
.log("...this should never have happened")
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