/*
 * Copyright (c) 2002, 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 8200151
 * @summary Tests that we can set the initial UDP timeout interval
 *          and the number of retries.
 * @modules java.base/sun.security.util
 * @library ../lib/
 * @run main Timeout
 */

import javax.naming.CommunicationException;
import javax.naming.Context;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import java.net.SocketTimeoutException;
import java.util.Hashtable;

public class Timeout {
    // Host 10.0.0.0 is a bit bucket, used here to simulate a DNS server that
    // doesn't respond. 10.0.0.0 server shouldn't be reachable.
    // Ping to this address should not give any reply
    private static final String HOST = "10.0.0.0";
    // Port 9 is a bit bucket, used here to simulate a DNS server that
    // doesn't respond.
    private static final int PORT = 9;

    public static void main(String[] args) throws Exception {
        Hashtable<Object, Object> env;

        // initialize test
        env = DNSTestUtils.initEnv(false, Timeout.class.getName(), args);

        String allQuietUrl = "dns://" + HOST + ":" + PORT;

        int timeout = 250;    // initial timeout = 1/4 sec
        int retries = 5;    // try 5 times per server

        env.put(Context.PROVIDER_URL, allQuietUrl);
        env.put("com.sun.jndi.dns.timeout.initial", "" + timeout);
        env.put("com.sun.jndi.dns.timeout.retries", "" + retries);

        DirContext ctx = null;

        try {
            ctx = new InitialDirContext(env);

            // Any request should fail after timeouts have expired.
            long startTime = System.currentTimeMillis();
            try {
                ctx.getAttributes("");
            } catch (CommunicationException e) {

                long elapsedTime = System.currentTimeMillis() - startTime;
                if (!(e.getRootCause() instanceof SocketTimeoutException)) {
                    throw e;
                }

                long expectedTime = timeout * ((1 << retries) - 1);
                DNSTestUtils.debug("Elapsed (ms):  " + elapsedTime);
                DNSTestUtils.debug("Expected (ms): " + expectedTime);

                // Check that elapsed time is as long as expected, and
                // not more than 50% greater.
                if (elapsedTime >= expectedTime
                        && elapsedTime * 2 <= expectedTime * 3) {
                    System.out.println("elapsed time is as long as expected.");
                    return;
                }
                throw new RuntimeException(
                        "Failed: timeout in " + elapsedTime + " ms, expected"
                                + expectedTime + "ms");
            }

            throw new RuntimeException(
                    "Failed: getAttributes succeeded unexpectedly");

        } finally {
            DNSTestUtils.cleanup(ctx);
        }
    }
}