StreamTimeout.java

/*
 * Copyright (c) 2010, 2019, 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 4521942
 * @summary Ensure that InputStreamReaders work properly
 *          when the underlying byte stream times out
 */

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.OutputStreamWriter;
import java.io.PrintStream;
import java.io.Reader;
import java.io.Writer;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class StreamTimeout {
    static final PrintStream log = System.err;
    static String charset = "US-ASCII";

    private static class Client extends Thread implements Closeable {
        private final Socket so;

        Client(int port) throws IOException {
            so = new Socket(InetAddress.getLoopbackAddress(), port);
        }

        @Override
        public void run() {
            try {
                Writer wr = new OutputStreamWriter(so.getOutputStream(),
                        charset);
                wr.write("ab");
                wr.flush();
            } catch (IOException x) {
                log.print("Unexpected exception in writer: ");
                x.printStackTrace();
            }
        }

        @Override
        public void close() throws IOException {
            so.close();
        }
    }

    private static void gobble(InputStream is, Reader rd,
            int ec, boolean force)
                    throws Exception
                    {
        int a = is.available();
        boolean r = rd.ready();
        log.print("" + a + " bytes available, "
                + "reader " + (r ? "" : "not ") + "ready");
        if (!r && !force) {
            log.println();
            return;
        }
        int c;
        try {
            c = rd.read();
        } catch (InterruptedIOException x) {
            log.println();
            throw x;
        }
        log.println(", read() ==> "
                + (c >= 0 ? ("'" + (char)c + "'" ): "EOF"));
        if (c != ec)
            throw new Exception("Incorrect value read: Expected "
                    + ec + ", read " + (char)c);
    }

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

        if (args.length > 0)
            charset = args[0];

        try(ServerSocket ss = new ServerSocket(0);
            Client cl = new Client(ss.getLocalPort())) {

            cl.start();

            try(Socket s = ss.accept()) {
                s.setSoTimeout(150);

                try(InputStream is = s.getInputStream();
                    Reader rd = new InputStreamReader(is, charset)) {

                    while (is.available() <= 0)
                        Thread.yield();

                    gobble(is, rd, 'a', false);
                    gobble(is, rd, 'b', false);
                    gobble(is, rd, -1, false);

                    boolean caught = false;
                    try {
                        gobble(is, rd, -1, true);
                    } catch (InterruptedIOException e) {
                        log.println("Read timed out, as expected");
                        caught = true;
                    }
                    if (!caught) {
                        log.println("Read did not time out, test inapplicable");
                        return;
                    }

                    caught = false;
                    try {
                        gobble(is, rd, -1, true);
                    } catch (InterruptedIOException x) {
                        log.println("Second read timed out, as expected");
                        caught = true;
                    }
                    if (!caught)
                        throw new Exception("Second read completed");
                }
            }

            cl.join();
        }
    }
}