| /* |
| * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 8201315 |
| * @summary Test that channels can be registered, interest ops can changed, |
| * and keys cancelled while a selection operation is in progress. |
| */ |
| |
| import java.io.IOException; |
| import java.nio.channels.ClosedSelectorException; |
| import java.nio.channels.Pipe; |
| import java.nio.channels.SelectionKey; |
| import java.nio.channels.Selector; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.Phaser; |
| |
| public class RegisterDuringSelect { |
| |
| static Callable<Void> selectLoop(Selector sel, Phaser barrier) { |
| return new Callable<Void>() { |
| @Override |
| public Void call() throws IOException { |
| for (;;) { |
| try { |
| sel.select(); |
| } catch (ClosedSelectorException ignore) { |
| return null; |
| } |
| if (sel.isOpen()) { |
| barrier.arriveAndAwaitAdvance(); |
| System.out.println("selectLoop advanced ..."); |
| } else { |
| // closed |
| return null; |
| } |
| } |
| } |
| }; |
| } |
| /** |
| * Invoke register, interestOps, and cancel concurrently with a thread |
| * doing a selection operation |
| */ |
| public static void main(String args[]) throws Exception { |
| Future<Void> result; |
| |
| ExecutorService pool = Executors.newFixedThreadPool(1); |
| try (Selector sel = Selector.open()) { |
| Phaser barrier = new Phaser(2); |
| |
| // submit task to do the select loop |
| result = pool.submit(selectLoop(sel, barrier)); |
| |
| Pipe p = Pipe.open(); |
| try { |
| Pipe.SourceChannel sc = p.source(); |
| sc.configureBlocking(false); |
| |
| System.out.println("register ..."); |
| SelectionKey key = sc.register(sel, SelectionKey.OP_READ); |
| if (!sel.keys().contains(key)) |
| throw new RuntimeException("key not in key set"); |
| sel.wakeup(); |
| barrier.arriveAndAwaitAdvance(); |
| |
| System.out.println("interestOps ..."); |
| key.interestOps(0); |
| sel.wakeup(); |
| barrier.arriveAndAwaitAdvance(); |
| |
| System.out.println("cancel ..."); |
| key.cancel(); |
| sel.wakeup(); |
| barrier.arriveAndAwaitAdvance(); |
| if (sel.keys().contains(key)) |
| throw new RuntimeException("key not removed from key set"); |
| |
| } finally { |
| p.source().close(); |
| p.sink().close(); |
| } |
| |
| } finally { |
| pool.shutdown(); |
| } |
| |
| // ensure selectLoop completes without exception |
| result.get(); |
| |
| } |
| } |
| |