我们可以把IObserver附加到鼠标事件并对这些事件异步记录到一个集合当中。
One could attach an IObserver to mouse events and record them asynchronously into a collection.
验证同步和异步服务调用正在将调用确认消息记录到控制台输出，如图19所示。
Verify that synchronous and asynchronous service calls are logging invocation confirmation messages to console output, as shown in Figure 19.
如果缓冲区的大小大于 0，那么审计记录是异步写的。
When the size of the buffer is greater than 0, audit records are written asynchronously.
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