为什么我一天会收到几次 CancelledKeyException
?我应该做些什么吗?我的代码有错吗?
Iterator<SelectionKey> keys = selector.selectedKeys().iterator();
while (keys.hasNext()) {
SelectionKey key = (SelectionKey) keys.next();
keys.remove();
try {
if (key.isValid()) {
if (key.isReadable()) {
readHandler.handle((Connection) key.attachment());
}
if (key.isWritable()) {
writeHandler.handle((Connection) key.attachment());
}
if (key.isAcceptable()) {
acceptHandler.handle(key);
}
}
} catch (CancelledKeyException e) {
_logger.error("CanceledKeyException in while loop:", e);
}
}
异常(exception):
java.nio.channels.CancelledKeyException: null
at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55) ~[na:1.6.0_12]
at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:69) ~[na:1.6.0_12]
at java.nio.channels.SelectionKey.isWritable(SelectionKey.java:294) ~[na:1.6.0_12]
at project.engine.io.SimpleReactor.work(SimpleReactor.java:194) ~[engine-02.06.11.jar:na]
at project.server.work.AbstractWorker$1.run(AbstractWorker.java:20) [server-21.05.11.jar:na]
at java.lang.Thread.run(Thread.java:619) [na:1.6.0_12]
最佳答案
其中一个处理程序可能会关闭 channel 。例如,读取处理程序应该在读取到 -1 时关闭 channel 。因此写处理程序将失败。实际上 isWritable()
会失败,正如我现在从您的堆栈跟踪中看到的那样。所以你必须用所有其他条件测试 isValid()
,例如isValid() && isReadable(),
isValid() && isWritable(),
等
关于java - 为什么我在通过键时得到 CancelledKeyException?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6215065/