Examples with Counter org.opennms.newts.api.Counter used on opensource projects

Example 6 with Counter

use of org.opennms.newts.api.Counter in project opennms by OpenNMS.

the class NewtsWriterTest method samplesAreDroppedWhenRingBufferIsFull.

/**
     * Fills the ring buffer and locks all of the writer threads to verify
     * that samples additional samples are dropped.
     */
@Test
public void samplesAreDroppedWhenRingBufferIsFull() throws Exception {
    Resource x = new Resource("x");
    int ringBufferSize = 1024;
    int numWriterThreads = 8;
    Lock lock = new ReentrantLock();
    LockedSampleRepository sampleRepo = new LockedSampleRepository(lock);
    MetricRegistry registry = new MetricRegistry();
    NewtsWriter writer = new NewtsWriter(1, ringBufferSize, numWriterThreads, registry);
    writer.setSampleRepository(sampleRepo);
    lock.lock();
    for (int i = 0; i < ringBufferSize; i++) {
        Sample s = new Sample(Timestamp.now(), x, "y", MetricType.COUNTER, new Counter(i));
        writer.insert(Lists.newArrayList(s));
    }
    // The ring buffer should be full, and all of the threads should be locked
    Thread.sleep(250);
    assertEquals(numWriterThreads, sampleRepo.getNumThreadsLocked());
    // Attempt to insert another batch of samples
    for (int i = 0; i < 8; i++) {
        Sample s = new Sample(Timestamp.now(), x, "y", MetricType.COUNTER, new Counter(i));
        writer.insert(Lists.newArrayList(s));
    }
    ;
    // Unlock the writer threads and wait for the ring buffer to drain
    lock.unlock();
    writer.destroy();
    // Verify the number of inserted samples
    assertEquals(0, sampleRepo.getNumThreadsLocked());
    assertEquals(ringBufferSize, sampleRepo.getNumSamplesInserted());
}