Examples with Transaction com.cloud.utils.db.Transaction used on opensource projects

Example 11 with Transaction

use of com.cloud.utils.db.Transaction in project CloudStack-archive by CloudStack-extras.

the class TestAsyncJobManager method tstLocking.

public void tstLocking() {
    int testThreads = 20;
    Thread[] threads = new Thread[testThreads];
    for (int i = 0; i < testThreads; i++) {
        final int current = i;
        threads[i] = new Thread(new Runnable() {

            public void run() {
                final HostDao hostDao = new HostDaoImpl();
                while (true) {
                    Transaction txn = Transaction.currentTxn();
                    try {
                        HostVO host = hostDao.acquireInLockTable(getRandomLockId(), 10);
                        if (host != null) {
                            s_logger.info("Thread " + (current + 1) + " acquired lock");
                            try {
                                Thread.sleep(getRandomMilliseconds(1000, 5000));
                            } catch (InterruptedException e) {
                            }
                            s_logger.info("Thread " + (current + 1) + " released lock");
                            hostDao.releaseFromLockTable(host.getId());
                            try {
                                Thread.sleep(getRandomMilliseconds(1000, 5000));
                            } catch (InterruptedException e) {
                            }
                        } else {
                            s_logger.info("Thread " + (current + 1) + " is not able to acquire lock");
                        }
                    } finally {
                        txn.close();
                    }
                }
            }
        });
        threads[i].start();
    }
    try {
        for (int i = 0; i < testThreads; i++) threads[i].join();
    } catch (InterruptedException e) {
    }
}