java - 在选择器线程之外的其他线程中设置 SelectionKey 的interestOps是否安全？ (Java 尼奥)

Question

我见过很多JavaNio的例子。他们都在选择器线程中设置了SelectionKey的interestOps。

他们为什么这么做？在选择器线程之外的其他线程中设置SelectionKey的interestOps是否安全？

或者可能出现异常情况，所以他们这样做？

Answer 1

SelectionKey JavaDoc说的是:

The operations of reading and writing the interest set will, in general, be synchronized with certain operations of the selector. Exactly how this synchronization is performed is implementation-dependent: In a naive implementation, reading or writing the interest set may block indefinitely if a selection operation is already in progress; in a high-performance implementation, reading or writing the interest set may block briefly, if at all.

与墨菲定律相结合，它实际上保证您只会遇到“幼稚”的实现，因此安全总比后悔好，并且仅在选择器线程中使用兴趣操作，保证它们不会阻塞。