Examples with JournalWriter com.questdb.store.JournalWriter used on opensource projects

Example 86 with JournalWriter

use of com.questdb.store.JournalWriter in project questdb by bluestreak01.

the class CachingWriterFactoryTest method testTwoThreadsRaceToAllocate.

@Test
public void testTwoThreadsRaceToAllocate() throws Exception {
    final JournalMetadata<?> m = new JournalStructure("x").$date("ts").$().build();
    int n = 2;
    final CyclicBarrier barrier = new CyclicBarrier(n);
    final CountDownLatch halt = new CountDownLatch(n);
    final AtomicInteger errors = new AtomicInteger();
    final AtomicInteger writerCount = new AtomicInteger();
    for (int i = 0; i < n; i++) {
        new Thread(() -> {
            try {
                barrier.await();
                try (JournalWriter ignored = wf.writer(m)) {
                    writerCount.incrementAndGet();
                } catch (WriterBusyException ignored) {
                }
            } catch (Exception e) {
                e.printStackTrace();
                errors.incrementAndGet();
            } finally {
                halt.countDown();
            }
        }).start();
    }
    halt.await();
    // this check is unreliable on slow build servers
    // it is very often the case that there are limited number of cores
    // available and threads execute sequentially rather than
    // simultaneously. We should check that none of the threads
    // receive error.
    // Assert.assertEquals(1, writerCount.get());
    Assert.assertEquals(0, errors.get());
    Assert.assertEquals(1, wf.countFreeWriters());
}

Example 87 with JournalWriter

use of com.questdb.store.JournalWriter in project questdb by bluestreak01.

the class CachingWriterFactoryTest method testLockNonExisting.

@Test
public void testLockNonExisting() throws Exception {
    final JournalMetadata<?> x = new JournalStructure("x").$date("ts").$().build();
    wf.lock(x.getName());
    try {
        wf.writer(x);
        Assert.fail();
    } catch (JournalLockedException ignored) {
    }
    wf.unlock(x.getName());
    try (JournalWriter wx = wf.writer(x)) {
        Assert.assertNotNull(wx);
    }
}

Example 88 with JournalWriter

use of com.questdb.store.JournalWriter in project questdb by bluestreak01.

the class CachingWriterFactoryTest method testOneThreadGetRelease.

@Test
public void testOneThreadGetRelease() throws Exception {
    final JournalMetadata<?> m = new JournalStructure("x").$date("ts").$().build();
    JournalWriter x;
    JournalWriter y;
    x = wf.writer(m);
    try {
        Assert.assertEquals(0, wf.countFreeWriters());
        Assert.assertNotNull(x);
        Assert.assertTrue(x.isOpen());
        Assert.assertTrue(x == wf.writer(m));
    } finally {
        x.close();
    }
    Assert.assertEquals(1, wf.countFreeWriters());
    y = wf.writer(m);
    try {
        Assert.assertNotNull(y);
        Assert.assertTrue(y.isOpen());
        Assert.assertTrue(y == x);
    } finally {
        y.close();
    }
    Assert.assertEquals(1, wf.countFreeWriters());
}

Example 89 with JournalWriter

use of com.questdb.store.JournalWriter in project questdb by bluestreak01.

the class CachingWriterFactoryTest method testAllocateAndClear.

@Test
public void testAllocateAndClear() throws Exception {
    final JournalMetadata<?> m = new JournalStructure("z").$date("ts").$().build();
    int n = 2;
    final CyclicBarrier barrier = new CyclicBarrier(n);
    final CountDownLatch halt = new CountDownLatch(n);
    final AtomicInteger errors = new AtomicInteger();
    final AtomicInteger writerCount = new AtomicInteger();
    new Thread(() -> {
        try {
            for (int i = 0; i < 1000; i++) {
                try (JournalWriter ignored = wf.writer(m)) {
                    writerCount.incrementAndGet();
                } catch (WriterBusyException ignored) {
                }
                if (i == 1) {
                    barrier.await();
                }
                LockSupport.parkNanos(10L);
            }
        } catch (Exception e) {
            e.printStackTrace();
            errors.incrementAndGet();
        } finally {
            halt.countDown();
        }
    }).start();
    new Thread(() -> {
        try {
            barrier.await();
            for (int i = 0; i < 1000; i++) {
                wf.releaseInactive();
                LockSupport.parkNanos(10L);
            }
        } catch (Exception e) {
            e.printStackTrace();
            errors.incrementAndGet();
        } finally {
            halt.countDown();
        }
    }).start();
    halt.await();
    Assert.assertTrue(writerCount.get() > 0);
    Assert.assertEquals(0, errors.get());
}

Example 90 with JournalWriter

use of com.questdb.store.JournalWriter in project questdb by bluestreak01.

the class CachingWriterFactoryTest method testFactoryCloseBeforeRelease.

@Test
public void testFactoryCloseBeforeRelease() throws Exception {
    final JournalMetadata<?> m = new JournalStructure("x").$date("ts").$().build();
    JournalWriter x;
    x = wf.writer(m);
    try {
        Assert.assertEquals(0, wf.countFreeWriters());
        Assert.assertNotNull(x);
        Assert.assertTrue(x.isOpen());
        Assert.assertTrue(x == wf.writer(m));
        wf.close();
    } finally {
        x.close();
    }
    Assert.assertFalse(x.isOpen());
    try {
        wf.writer(m);
    } catch (FactoryClosedException ignored) {
    }
}