Examples with MockConsumer org.apache.kafka.clients.consumer.MockConsumer used on opensource projects

Example 1 with MockConsumer

use of org.apache.kafka.clients.consumer.MockConsumer in project kafka by apache.

the class AbstractTaskTest method shouldThrowWakeupExceptionOnInitializeOffsetsWhenWakeupException.

@Test(expected = WakeupException.class)
public void shouldThrowWakeupExceptionOnInitializeOffsetsWhenWakeupException() throws Exception {
    final Consumer consumer = mockConsumer(new WakeupException());
    final AbstractTask task = createTask(consumer);
    task.initializeOffsetLimits();
}

Example 2 with MockConsumer

use of org.apache.kafka.clients.consumer.MockConsumer in project kafka by apache.

the class AbstractTaskTest method shouldThrowProcessorStateExceptionOnInitializeOffsetsWhenKafkaException.

@Test(expected = ProcessorStateException.class)
public void shouldThrowProcessorStateExceptionOnInitializeOffsetsWhenKafkaException() throws Exception {
    final Consumer consumer = mockConsumer(new KafkaException("blah"));
    final AbstractTask task = createTask(consumer);
    task.initializeOffsetLimits();
}

Example 3 with MockConsumer

use of org.apache.kafka.clients.consumer.MockConsumer in project kafka by apache.

the class StoreChangelogReaderTest method shouldFallbackToPartitionsForIfPartitionNotInAllPartitionsList.

@SuppressWarnings("unchecked")
@Test
public void shouldFallbackToPartitionsForIfPartitionNotInAllPartitionsList() throws Exception {
    final MockConsumer<byte[], byte[]> consumer = new MockConsumer(OffsetResetStrategy.EARLIEST) {

        @Override
        public List<PartitionInfo> partitionsFor(final String topic) {
            return Collections.singletonList(partitionInfo);
        }
    };
    final StoreChangelogReader changelogReader = new StoreChangelogReader(consumer, new MockTime(), 10);
    changelogReader.validatePartitionExists(topicPartition, "store");
}

Example 4 with MockConsumer

use of org.apache.kafka.clients.consumer.MockConsumer in project kafka by apache.

the class StoreChangelogReaderTest method shouldThrowStreamsExceptionIfTimeoutOccursDuringPartitionsFor.

@SuppressWarnings("unchecked")
@Test
public void shouldThrowStreamsExceptionIfTimeoutOccursDuringPartitionsFor() throws Exception {
    final MockConsumer<byte[], byte[]> consumer = new MockConsumer(OffsetResetStrategy.EARLIEST) {

        @Override
        public List<PartitionInfo> partitionsFor(final String topic) {
            throw new TimeoutException("KABOOM!");
        }
    };
    final StoreChangelogReader changelogReader = new StoreChangelogReader(consumer, new MockTime(), 5);
    try {
        changelogReader.validatePartitionExists(topicPartition, "store");
        fail("Should have thrown streams exception");
    } catch (final StreamsException e) {
    // pass
    }
}

Example 5 with MockConsumer

use of org.apache.kafka.clients.consumer.MockConsumer in project beam by apache.

the class KafkaIOTest method mkMockConsumer.

// Update mock consumer with records distributed among the given topics, each with given number
// of partitions. Records are assigned in round-robin order among the partitions.
private static MockConsumer<byte[], byte[]> mkMockConsumer(List<String> topics, int partitionsPerTopic, int numElements, OffsetResetStrategy offsetResetStrategy) {
    final List<TopicPartition> partitions = new ArrayList<>();
    final Map<TopicPartition, List<ConsumerRecord<byte[], byte[]>>> records = new HashMap<>();
    Map<String, List<PartitionInfo>> partitionMap = new HashMap<>();
    for (String topic : topics) {
        List<PartitionInfo> partIds = new ArrayList<>(partitionsPerTopic);
        for (int i = 0; i < partitionsPerTopic; i++) {
            TopicPartition tp = new TopicPartition(topic, i);
            partitions.add(tp);
            partIds.add(new PartitionInfo(topic, i, null, null, null));
            records.put(tp, new ArrayList<ConsumerRecord<byte[], byte[]>>());
        }
        partitionMap.put(topic, partIds);
    }
    int numPartitions = partitions.size();
    final long[] offsets = new long[numPartitions];
    for (int i = 0; i < numElements; i++) {
        int pIdx = i % numPartitions;
        TopicPartition tp = partitions.get(pIdx);
        records.get(tp).add(new ConsumerRecord<>(tp.topic(), tp.partition(), offsets[pIdx]++, // key is 4 byte record id
        ByteBuffer.wrap(new byte[4]).putInt(i).array(), // value is 8 byte record id
        ByteBuffer.wrap(new byte[8]).putLong(i).array()));
    }
    // This is updated when reader assigns partitions.
    final AtomicReference<List<TopicPartition>> assignedPartitions = new AtomicReference<>(Collections.<TopicPartition>emptyList());
    final MockConsumer<byte[], byte[]> consumer = new MockConsumer<byte[], byte[]>(offsetResetStrategy) {

        // override assign() in order to set offset limits & to save assigned partitions.
        //remove keyword '@Override' here, it can work with Kafka client 0.9 and 0.10 as:
        //1. SpEL can find this function, either input is List or Collection;
        //2. List extends Collection, so super.assign() could find either assign(List)
        //  or assign(Collection).
        public void assign(final List<TopicPartition> assigned) {
            super.assign(assigned);
            assignedPartitions.set(ImmutableList.copyOf(assigned));
            for (TopicPartition tp : assigned) {
                updateBeginningOffsets(ImmutableMap.of(tp, 0L));
                updateEndOffsets(ImmutableMap.of(tp, (long) records.get(tp).size()));
            }
        }

        // Override offsetsForTimes() in order to look up the offsets by timestamp.
        // Remove keyword '@Override' here, Kafka client 0.10.1.0 previous versions does not have
        // this method.
        // Should return Map<TopicPartition, OffsetAndTimestamp>, but 0.10.1.0 previous versions
        // does not have the OffsetAndTimestamp class. So return a raw type and use reflection
        // here.
        @SuppressWarnings("unchecked")
        public Map offsetsForTimes(Map<TopicPartition, Long> timestampsToSearch) {
            HashMap<TopicPartition, Object> result = new HashMap<>();
            try {
                Class<?> cls = Class.forName("org.apache.kafka.clients.consumer.OffsetAndTimestamp");
                // OffsetAndTimestamp(long offset, long timestamp)
                Constructor constructor = cls.getDeclaredConstructor(long.class, long.class);
                // In test scope, timestamp == offset.
                for (Map.Entry<TopicPartition, Long> entry : timestampsToSearch.entrySet()) {
                    long maxOffset = offsets[partitions.indexOf(entry.getKey())];
                    Long offset = entry.getValue();
                    if (offset >= maxOffset) {
                        offset = null;
                    }
                    result.put(entry.getKey(), constructor.newInstance(entry.getValue(), offset));
                }
                return result;
            } catch (ClassNotFoundException | IllegalAccessException | InstantiationException | NoSuchMethodException | InvocationTargetException e) {
                throw new RuntimeException(e);
            }
        }
    };
    for (String topic : topics) {
        consumer.updatePartitions(topic, partitionMap.get(topic));
    }
    // MockConsumer does not maintain any relationship between partition seek position and the
    // records added. e.g. if we add 10 records to a partition and then seek to end of the
    // partition, MockConsumer is still going to return the 10 records in next poll. It is
    // our responsibility to make sure currently enqueued records sync with partition offsets.
    // The following task will be called inside each invocation to MockConsumer.poll().
    // We enqueue only the records with the offset >= partition's current position.
    Runnable recordEnqueueTask = new Runnable() {

        @Override
        public void run() {
            // add all the records with offset >= current partition position.
            for (TopicPartition tp : assignedPartitions.get()) {
                long curPos = consumer.position(tp);
                for (ConsumerRecord<byte[], byte[]> r : records.get(tp)) {
                    if (r.offset() >= curPos) {
                        consumer.addRecord(r);
                    }
                }
            }
            consumer.schedulePollTask(this);
        }
    };
    consumer.schedulePollTask(recordEnqueueTask);
    return consumer;
}