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This article mainly introduces "how to use java's select method and register method". In daily operation, I believe many people have doubts about how to use java's select method and register method. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the questions of "how to use java's select method and register method". Next, please follow the editor to study!

RegisterLock.lock (); try {return sc.register (this.selector, ops, handle);} finally {registerLock.unlock ();}-/ / if registration is in progress, cannot enter select () registerLock.lock () Try {/ * nothing * /} finally {registerLock.unlock ();} java.util.Set selected = selector.selectedKeys (); for (SelectionKey key: selected) {.. }

Answer:

Select () and select (long) are blocking operations:

It can be returned through selector.wakeup ()

By calling selector.close ()

Call the interrupt method of the blocked thread.

Notice that the selector.close () method also synchronizes keys and selectedKeys. In general, keys () and selectedKeys are not safe to use in a multithreaded environment.

In fact, the result returned by selector.keys () is a Collections.unmodifiableSet (keys), where the keys parameter is a set maintained within selector. This shows that the keys collection is read-only.

The result returned by selector.selectedKeys () is a Util.ungrowableSet (selectedKeys), where the argument is a collection maintained within selector. Thus it can be seen that selectedKeys cannot be operated by add externally.

But you can remove and perform iterator operations.

At this point, the study on "how to use the select method and register method of java" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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