轮询：按固定频繁调用收集器，它将检索和跟踪PDS中的指标或指标集的当前值。
Polling: the collector is invoked on a regular frequency, and it retrieves and traces the current value of a metric or set of metrics from a PDS.
如果用户按下其他任何键，且输入了最小字符数或更多字符，则将对服务器发出异步调用，检索建议的JSON数组。
If the user presses any other key and has entered at least the minimum number of characters, an asynchronous call to the server is made to retrieve a JSON array of Suggestions.
按消息或相关性标识符从队列中检索消息将降低应用程序的性能。
Retrieving messages from a queue by message or correlation identifiers will reduce application performance.
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