/*

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 * 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.

 *

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 */

/*

 * @test

 * @bug 8044131

 * @summary Tests the hooks used for detecting idleness of the sjavac server.

 * @modules jdk.compiler/com.sun.tools.sjavac.server

 * @build Wrapper

 * @run main Wrapper IdleShutdown

 */

import java.util.concurrent.atomic.AtomicLong;

import com.sun.tools.javac.main.Main.Result;

import com.sun.tools.sjavac.server.IdleResetSjavac;

import com.sun.tools.sjavac.server.Sjavac;

import com.sun.tools.sjavac.server.Terminable;

public class IdleShutdown {

    final static long TEST_START = System.currentTimeMillis();

    final static long TIMEOUT_MS = 3000;

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

        final AtomicLong timeoutTimestamp = new AtomicLong(-1);

        log("Starting IdleCallbackJavacService with timeout: " + TIMEOUT_MS);

        Sjavac service = new IdleResetSjavac(

                new NoopJavacService(),

                new Terminable() {

                    public void shutdown(String msg) {

                        // Record the idle timeout time

                        log("Timeout detected");

                        timeoutTimestamp.set(System.currentTimeMillis());

                    }

                },

                TIMEOUT_MS);

        // Make sure it didn't timeout immediately

        if (timeoutTimestamp.get() != -1)

            throw new AssertionError("Premature timeout detected.");

        // Use Sjavac object and wait less than TIMEOUT_MS in between calls

        Thread.sleep(TIMEOUT_MS - 1000);

        log("Compiling");

        service.compile(new String[0]);

        Thread.sleep(TIMEOUT_MS - 1000);

        log("Compiling");

        service.compile(new String[0]);

        if (timeoutTimestamp.get() != -1)

            throw new AssertionError("Premature timeout detected.");

        long expectedTimeout = System.currentTimeMillis() + TIMEOUT_MS;

        // Wait for actual timeout

        log("Awaiting idle timeout");

        Thread.sleep(TIMEOUT_MS + 1000);

        // Check result

        if (timeoutTimestamp.get() == -1)

            throw new AssertionError("Timeout never occurred");

        long error = Math.abs(expectedTimeout - timeoutTimestamp.get());

        log("Timeout error: " + error + " ms");

        if (error > TIMEOUT_MS * .1)

            throw new AssertionError("Error too big");

        log("Shutting down");

        service.shutdown();

    }

    private static void log(String msg) {

        long logTime = System.currentTimeMillis() - TEST_START;

        System.out.printf("After %5d ms: %s%n", logTime, msg);

    }

    private static class NoopJavacService implements Sjavac {

        @Override

        public void shutdown() {

        }

        @Override

        public Result compile(String[] args) {

            // Attempt to trigger idle timeout during a call by sleeping

            try {

                Thread.sleep(TIMEOUT_MS + 1000);

            } catch (InterruptedException e) {

            }

            return Result.OK;

        }

    }

}