/*
 * 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 4521942
 * @summary Ensure that InputStreamReaders work properly
 *          when the underlying byte stream times out
 */

import java.net.*;
import java.io.*;


public class StreamTimeout {

    private static PrintStream log = System.err;

    private static String charset = "US-ASCII";

    private static Object lock = new Object();
    private static synchronized void waitABit(int millisec) {
        synchronized(lock) {
            try {
                lock.wait(millisec);
            } catch (InterruptedException e) {
                //ignore
            }
        }
    }

    private static class Client extends Thread {
        public void run() {
            try {
                Socket so = new Socket("127.0.0.1", 22222);
                Writer wr = new OutputStreamWriter(so.getOutputStream(),
                                                   charset);
                wr.write("ab");
                wr.flush();
            } catch (IOException x) {
                log.print("Unexpected exception in writer: ");
                x.printStackTrace();
                System.exit(1);
            }
        }
    }

    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];

        ServerSocket ss = new ServerSocket(22222);
        Thread cl = new Client();
        cl.start();
        Socket s = ss.accept();
        s.setSoTimeout(150);
        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");

    }

}