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/**
 * @test
 * @bug 8324066
 * @summary Test the clhsdb 'jstack -l' command for printing concurrent lock information
 * @requires vm.hasSA
 * @library /test/lib
 * @run main/othervm ClhsdbJstackWithConcurrentLock
 */

import java.util.List;
import jdk.test.lib.apps.LingeredApp;
import jtreg.SkippedException;

public class ClhsdbJstackWithConcurrentLock {

    public static void main(String[] args) throws Exception {
        System.out.println("Starting the ClhsdbJstackWithConcurrentLock test");

        LingeredApp theApp = null;
        try {
            ClhsdbLauncher test = new ClhsdbLauncher();

            theApp = new LingeredAppWithConcurrentLock();
            // Use a small heap so the scan is quick.
            LingeredApp.startApp(theApp, "-Xmx4m");
            System.out.println("Started LingeredApp with pid " + theApp.getPid());

            // Run the 'jstack -l' command to get the stack and have java.util.concurrent
            // lock information included.
            List<String> cmds = List.of("jstack -l");
            String jstackOutput = test.run(theApp.getPid(), cmds, null, null);

            // We are looking for:
            //   Locked ownable synchronizers:
            //    - <0x00000000ffc2ed70>, (a java/util/concurrent/locks/ReentrantLock$NonfairSync)
            // We want to fetch the address from this line.
            String key = ", (a java/util/concurrent/locks/ReentrantLock$NonfairSync)";
            String[] lines = jstackOutput.split("\\R");
            String addressString = null;
            for (String line : lines) {
                if (line.contains(key)) {
                    String[] words = line.split("[, ]");
                    for (String word : words) {
                        word = word.replace("<", "").replace(">", "");
                        if (word.startsWith("0x")) {
                            addressString = word;
                            break;
                        }
                    }
                    if (addressString != null)
                        break;
                }
            }
            if (addressString == null) {
                throw new RuntimeException("Token '" + key + "' not found in jstack output");
            }

            // We are looking for the following java frame:
            //  - jdk.internal.misc.Unsafe.park(boolean, long)...
            //      - parking to wait for <0x00000000ffc2ed70> (a java/util/concurrent/locks/ReentrantLock$NonfairSync)
            // Note the address matches the one we found above.
            key = "- parking to wait for <" + addressString +
                "> (a java/util/concurrent/locks/ReentrantLock$NonfairSync)";
            boolean found = false;
            for (String line : lines) {
                if (line.contains(key)) {
                    found = true;
                    break;
                }
            }
            if (!found) {
                throw new RuntimeException("Token '" + key + "' not found in jstack output");
            }
        } catch (SkippedException e) {
            throw e;
        } catch (Exception ex) {
            throw new RuntimeException("Test ERROR " + ex, ex);
        } finally {
            LingeredApp.stopApp(theApp);
            System.out.println("OUTPUT: " + theApp.getOutput());
        }
        System.out.println("Test PASSED");
    }
}