blueprint.sdk.util.debug.DeadlockDetector Maven / Gradle / Ivy

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/*
 License:

 blueprint-sdk is licensed under the terms of Eclipse Public License(EPL) v1.0
 (http://www.eclipse.org/legal/epl-v10.html)


 Distribution:

 Maven Central - https://search.maven.org/artifact/io.github.lempel/blueprint-sdk
 MVN Repository - https://mvnrepository.com/artifact/io.github.lempel/blueprint-sdk
 */

package blueprint.sdk.util.debug;

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import blueprint.sdk.util.jvm.shutdown.TerminatableThread;

/**
 * Periodically checks MXBean for deadlock.
 *
 * @author [email protected]
 * @since 2013. 11. 6.
 */
@SuppressWarnings("WeakerAccess")
public class DeadlockDetector extends TerminatableThread {
    private static final Logger L = LoggerFactory.getLogger(DeadlockDetector.class);

    public DeadlockDetector() {
        super();

        setDaemon(true);
    }

    @Override
    public void run() {
        ThreadMXBean bean = ManagementFactory.getThreadMXBean();

        while (running) {
            // Returns null if no threads are deadlocked.
            long[] threadIds = bean.findDeadlockedThreads();

            if (threadIds != null) {
                ThreadInfo[] infos = bean.getThreadInfo(threadIds);

                for (ThreadInfo info : infos) {
                    StackTraceElement[] stack = info.getStackTrace();

                    for (StackTraceElement stackTraceElement : stack) {
                        L.warn(stackTraceElement.toString());
                    }
                }
            }

            try {
                Thread.sleep(30000);
            } catch (InterruptedException ignore) {
            }
        }

        terminated = true;
    }
}