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Java example source code file (TemporarySelector.java)

This example Java source code file (TemporarySelector.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

exception, inetsocketaddress, net, network, runnable, serversocket, serversocketchannel, temporaryselector, the, thread

The TemporarySelector.java Java example source code

/*
 * Copyright (c) 2010, 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 6645197
 * @run main/othervm -Xmx5m TemporarySelector
 * @summary Timed read with socket adaptor throws ClosedSelectorException if temporary selector GC'ed.
 */
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;

public class TemporarySelector {

    static volatile boolean done = false;

    public static void main(String[] args) throws Exception {

        Runnable r = new Runnable() {
            public void run() {
                while (!done) {
                    System.gc();
                    try {
                        Thread.sleep(1000);
                    } catch (Exception e) {
                    }
                }
            }
        };

        try {
            // Create a server socket that will open and accept on loopback connection
            ServerSocketChannel ssc =  ServerSocketChannel.open();
            final ServerSocket ss =  ssc.socket();
            ss.bind(new InetSocketAddress(0));
            int localPort = ss.getLocalPort();

            // Create a client socket that will connect and read
            System.out.println("Connecting to server socket");
            System.out.flush();
            SocketChannel channel = SocketChannel.open(new InetSocketAddress("localhost", localPort));
            System.out.println("Connected to server socket");
            System.out.flush();

            // Create a thread to try and cause the GC to run
            Thread t = new Thread(r);
            t.start();
            byte[] buffer = new byte[500];
            System.out.println("Reading from socket input stream");
            System.out.flush();
            Socket socket = channel.socket();
            socket.setSoTimeout(10000);  // The timeout must be set
            // to trigger this bug
            try {
                socket.getInputStream().read(buffer);
            } catch (java.net.SocketTimeoutException ste) {
                // no java.nio.channels.ClosedSelectorException
            }
        } finally {
            done = true;
        }
    }
}

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