Threads

threads.java

    public String getThreadStatus()
    {
        StringBuffer buf = new StringBuffer();
        Thread[] daemonThreads = getAllDaemonThreads();
        for (Thread thread : daemonThreads) {
            if (thread.getName().contains("Solrj")) {
                buf.append(thread.getName() + "--" + thread + "\n");
            }
        }
        return buf.toString();
    }

    ThreadGroup rootThreadGroup = null;

    ThreadGroup getRootThreadGroup()
    {
        if (rootThreadGroup != null)
            return rootThreadGroup;
        ThreadGroup tg = Thread.currentThread().getThreadGroup();
        ThreadGroup ptg;
        while ((ptg = tg.getParent()) != null)
            tg = ptg;
        return tg;
    }

    Thread[] getAllThreads()
    {
        final ThreadGroup root = getRootThreadGroup();
        final ThreadMXBean thbean = ManagementFactory.getThreadMXBean();
        int nAlloc = thbean.getThreadCount();
        int n = 0;
        Thread[] threads;
        do {
            nAlloc *= 2;
            threads = new Thread[nAlloc];
            n = root.enumerate(threads, true);
        } while (n == nAlloc);
        return java.util.Arrays.copyOf(threads, n);
    }

    Thread[] getAllDaemonThreads()
    {
        final Thread[] allThreads = getAllThreads();
        final Thread[] daemons = new Thread[allThreads.length];
        int nDaemon = 0;
        for (Thread thread : allThreads)
            if (thread.isDaemon())
                daemons[nDaemon++] = thread;
        return java.util.Arrays.copyOf(daemons, nDaemon);
    }