Examples with RetryLockException com.questdb.ex.RetryLockException used on opensource projects

Example 1 with RetryLockException

use of com.questdb.ex.RetryLockException in project questdb by bluestreak01.

the class CachingReaderFactoryTest method testLockUnlock.

@Test
public void testLockUnlock() throws Exception {
    // create journals
    final JournalMetadata<?> m1 = new JournalStructure("x").$date("ts").$().build();
    ((WriterFactory) getFactory()).writer(m1).close();
    final JournalMetadata<?> m2 = new JournalStructure("y").$date("ts").$().build();
    ((WriterFactory) getFactory()).writer(m2).close();
    Journal x, y;
    try (final CachingReaderFactory rf = new CachingReaderFactory(factoryContainer.getConfiguration(), 1000, 2)) {
        x = rf.reader(m1);
        Assert.assertNotNull(x);
        y = rf.reader(m2);
        Assert.assertNotNull(y);
        // expect lock to fail because we have "x" open
        try {
            rf.lock(m1.getName());
            Assert.fail();
        } catch (RetryLockException ignore) {
        }
        x.close();
        // expect lock to succeed after we closed "x"
        rf.lock(m1.getName());
        // expect "x" to be physically closed
        Assert.assertFalse(x.isOpen());
        // "x" is locked, expect this to fail
        try {
            Assert.assertNull(rf.reader(m1));
        } catch (JournalLockedException ignored) {
        }
        rf.unlock(m1.getName());
        x = rf.reader(m1);
        Assert.assertNotNull(x);
        x.close();
        Assert.assertTrue(x.isOpen());
    }
    Assert.assertTrue(y.isOpen());
    y.close();
    Assert.assertFalse(y.isOpen());
    // "x" was not busy and should be closed by factory
    Assert.assertFalse(x.isOpen());
}

Example 2 with RetryLockException

use of com.questdb.ex.RetryLockException in project questdb by bluestreak01.

the class CachingReaderFactoryTest method testLockUnlockMultiple.

@Test
public void testLockUnlockMultiple() throws Exception {
    final JournalMetadata<?> m1 = new JournalStructure("x").$date("ts").$().build();
    getFactory().writer(m1).close();
    try (final CachingReaderFactory rf = new CachingReaderFactory(factoryContainer.getConfiguration(), 1000, 2)) {
        Journal r1 = rf.reader(m1);
        Journal r2 = rf.reader(m1);
        r1.close();
        try {
            rf.lock(m1.getName());
        } catch (RetryLockException e) {
            e.printStackTrace();
        }
        r2.close();
        rf.lock(m1.getName());
        rf.unlock(m1.getName());
    }
}

Example 3 with RetryLockException

use of com.questdb.ex.RetryLockException in project questdb by bluestreak01.

the class CachingReaderFactoryTest method testLockBusyReader.

@Test
public void testLockBusyReader() throws Exception {
    final int readerCount = 5;
    int threadCount = 2;
    final int iterations = 10000;
    // create journals to read
    final JournalMetadata<?>[] meta = new JournalMetadata[readerCount];
    for (int i = 0; i < readerCount; i++) {
        final JournalMetadata<?> m = new JournalStructure("x" + i).$date("ts").$().build();
        ((WriterFactory) getFactory()).writer(m).close();
        meta[i] = m;
    }
    try {
        try (final CachingReaderFactory rf = new CachingReaderFactory(factoryContainer.getConfiguration(), 1000, 2)) {
            final CyclicBarrier barrier = new CyclicBarrier(threadCount);
            final CountDownLatch halt = new CountDownLatch(threadCount);
            final AtomicInteger errors = new AtomicInteger();
            final LongList lockTimes = new LongList();
            final LongList workerTimes = new LongList();
            new Thread(() -> {
                Rnd rnd = new Rnd();
                try {
                    barrier.await();
                    String name = null;
                    for (int i = 0; i < iterations; i++) {
                        if (name == null) {
                            name = meta[rnd.nextPositiveInt() % readerCount].getName();
                        }
                        while (true) {
                            try {
                                rf.lock(name);
                                lockTimes.add(System.currentTimeMillis());
                                LockSupport.parkNanos(100L);
                                rf.unlock(name);
                                name = null;
                                break;
                            } catch (JournalException e) {
                                if (!(e instanceof RetryLockException)) {
                                    e.printStackTrace();
                                    errors.incrementAndGet();
                                    break;
                                }
                            }
                        }
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    errors.incrementAndGet();
                }
                halt.countDown();
            }).start();
            new Thread(() -> {
                Rnd rnd = new Rnd();
                workerTimes.add(System.currentTimeMillis());
                for (int i = 0; i < iterations; i++) {
                    JournalMetadata<?> metadata = meta[rnd.nextPositiveInt() % readerCount];
                    try (Journal<?> ignored = rf.reader(metadata)) {
                        if (metadata == meta[readerCount - 1] && barrier.getNumberWaiting() > 0) {
                            barrier.await();
                        }
                        LockSupport.parkNanos(10L);
                    } catch (JournalLockedException ignored) {
                    } catch (Exception e) {
                        e.printStackTrace();
                        errors.incrementAndGet();
                    }
                }
                workerTimes.add(System.currentTimeMillis());
                halt.countDown();
            }).start();
            halt.await();
            Assert.assertEquals(0, errors.get());
            // check that there are lock times between worker times
            int count = 0;
            // ensure that we have worker times
            Assert.assertEquals(2, workerTimes.size());
            long lo = workerTimes.get(0);
            long hi = workerTimes.get(1);
            Assert.assertTrue(lockTimes.size() > 0);
            for (int i = 0, n = lockTimes.size(); i < n; i++) {
                long t = lockTimes.getQuick(i);
                if (t > lo && t < hi) {
                    count++;
                }
            }
            Assert.assertTrue(count > 0);
        }
    } catch (Throwable e) {
        e.printStackTrace();
    }
}