/*

 * Copyright (c) 2017, 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.

 */

import java.util.ArrayList;

import java.util.Scanner;

import java.util.List;

import java.io.File;

import java.io.IOException;

import java.util.stream.Collectors;

import java.io.OutputStream;

import jdk.test.lib.apps.LingeredApp;

import jdk.test.lib.JDKToolLauncher;

import jdk.test.lib.Platform;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.Utils;

import jdk.test.lib.Asserts;

/*

 * @test

 * @library /test/lib

 * @run main/othervm TestClhsdbJstackLock

 */

public class TestClhsdbJstackLock {

    private static final String JSTACK_OUT_FILE = "jstack_out.txt";

    private static void verifyJStackOutput() throws Exception {

        Exception unexpected = null;

        File jstackFile = new File(JSTACK_OUT_FILE);

        Asserts.assertTrue(jstackFile.exists() && jstackFile.isFile(),

                           "File with jstack output not created: " +

                           jstackFile.getAbsolutePath());

        try {

            Scanner scanner = new Scanner(jstackFile);

            boolean classLockOwnerFound = false;

            boolean classLockWaiterFound = false;

            boolean objectLockOwnerFound = false;

            boolean primitiveLockOwnerFound = false;

            while (scanner.hasNextLine()) {

                String line = scanner.nextLine();

                System.out.println(line);

                if (line.contains("missing reason for ")) {

                    unexpected = new RuntimeException("Unexpected msg: missing reason for ");

                    break;

                }

                if (line.matches("^\\s+- locked <0x[0-9a-f]+> \\(a java\\.lang\\.Class for LingeredAppWithLock\\)$")) {

                    classLockOwnerFound = true;

                }

                if (line.matches("^\\s+- waiting to lock <0x[0-9a-f]+> \\(a java\\.lang\\.Class for LingeredAppWithLock\\)$")) {

                    classLockWaiterFound = true;

                }

                if (line.matches("^\\s+- locked <0x[0-9a-f]+> \\(a java\\.lang\\.Thread\\)$")) {

                    objectLockOwnerFound = true;

                }

                if (line.matches("^\\s+- locked <0x[0-9a-f]+> \\(a java\\.lang\\.Class for int\\)$")) {

                    primitiveLockOwnerFound = true;

                }

            }

            if (!classLockOwnerFound || !classLockWaiterFound ||

                !objectLockOwnerFound || !primitiveLockOwnerFound) {

                unexpected = new RuntimeException(

                      "classLockOwnerFound = " + classLockOwnerFound +

                      ", classLockWaiterFound = " + classLockWaiterFound +

                      ", objectLockOwnerFound = " + objectLockOwnerFound +

                      ", primitiveLockOwnerFound = " + primitiveLockOwnerFound);

            }

            if (unexpected != null) {

                throw unexpected;

            }

        } catch (Exception ex) {

            throw new RuntimeException("Test ERROR " + ex, ex);

        } finally {

            jstackFile.delete();

        }

    }

    private static void startClhsdbForLock(long lingeredAppPid) throws Exception {

        Process p;

        JDKToolLauncher launcher = JDKToolLauncher.createUsingTestJDK("jhsdb");

        launcher.addToolArg("clhsdb");

        launcher.addToolArg("--pid");

        launcher.addToolArg(Long.toString(lingeredAppPid));

        ProcessBuilder pb = new ProcessBuilder();

        pb.command(launcher.getCommand());

        System.out.println(pb.command().stream().collect(Collectors.joining(" ")));

        try {

            p = pb.start();

        } catch (Exception attachE) {

            throw new Error("Couldn't start jhsdb or attach to LingeredApp : " + attachE);

        }

        // Issue the 'jstack' input at the clhsdb prompt.

        OutputStream input = p.getOutputStream();

        String str = "jstack > " + JSTACK_OUT_FILE + "\nquit\n";

        try {

            input.write(str.getBytes());

            input.flush();

        } catch (IOException ioe) {

            throw new Error("Problem issuing the jstack command: " + str, ioe);

        }

        OutputAnalyzer output = new OutputAnalyzer(p);

        try {

            p.waitFor();

        } catch (InterruptedException ie) {

            p.destroyForcibly();

            throw new Error("Problem awaiting the child process: " + ie, ie);

        }

        output.shouldHaveExitValue(0);

    }

    public static void main (String... args) throws Exception {

        LingeredApp app = null;

        if (!Platform.shouldSAAttach()) {

            System.out.println("SA attach not expected to work - test skipped.");

            return;

        }

        try {

            List<String> vmArgs = new ArrayList<String>(Utils.getVmOptions());

            app = new LingeredAppWithLock();

            LingeredApp.startApp(vmArgs, app);

            System.out.println ("Started LingeredApp with pid " + app.getPid());

            startClhsdbForLock(app.getPid());

            verifyJStackOutput();

        } finally {

            LingeredApp.stopApp(app);

        }

    }

}