Examples with Collections.emptyList java.util.Collections.emptyList used on opensource projects

Example 11 with Collections.emptyList

use of java.util.Collections.emptyList in project kafka by apache.

the class AbstractStickyAssignorTest method testAddRemoveConsumerOneTopic.

@Test
public void testAddRemoveConsumerOneTopic() {
    Map<String, Integer> partitionsPerTopic = new HashMap<>();
    partitionsPerTopic.put(topic, 3);
    subscriptions.put(consumer1, new Subscription(topics(topic)));
    Map<String, List<TopicPartition>> assignment = assignor.assign(partitionsPerTopic, subscriptions);
    assertEquals(partitions(tp(topic, 0), tp(topic, 1), tp(topic, 2)), assignment.get(consumer1));
    verifyValidityAndBalance(subscriptions, assignment, partitionsPerTopic);
    assertTrue(isFullyBalanced(assignment));
    subscriptions.put(consumer1, buildSubscription(topics(topic), assignment.get(consumer1)));
    subscriptions.put(consumer2, buildSubscription(topics(topic), Collections.emptyList()));
    assignment = assignor.assign(partitionsPerTopic, subscriptions);
    assertEquals(Collections.singletonMap(tp(topic, 2), consumer2), assignor.partitionsTransferringOwnership);
    verifyValidityAndBalance(subscriptions, assignment, partitionsPerTopic);
    assertEquals(partitions(tp(topic, 0), tp(topic, 1)), assignment.get(consumer1));
    assertEquals(partitions(tp(topic, 2)), assignment.get(consumer2));
    assertTrue(isFullyBalanced(assignment));
    subscriptions.remove(consumer1);
    subscriptions.put(consumer2, buildSubscription(topics(topic), assignment.get(consumer2)));
    assignment = assignor.assign(partitionsPerTopic, subscriptions);
    assertEquals(new HashSet<>(partitions(tp(topic, 2), tp(topic, 1), tp(topic, 0))), new HashSet<>(assignment.get(consumer2)));
    assertTrue(assignor.partitionsTransferringOwnership.isEmpty());
    verifyValidityAndBalance(subscriptions, assignment, partitionsPerTopic);
    assertTrue(isFullyBalanced(assignment));
}

Example 12 with Collections.emptyList

use of java.util.Collections.emptyList in project kafka by apache.

the class FetcherTest method testEmptyControlBatch.

@Test
public void testEmptyControlBatch() {
    buildFetcher(OffsetResetStrategy.EARLIEST, new ByteArrayDeserializer(), new ByteArrayDeserializer(), Integer.MAX_VALUE, IsolationLevel.READ_COMMITTED);
    ByteBuffer buffer = ByteBuffer.allocate(1024);
    int currentOffset = 1;
    // Empty control batch should not cause an exception
    DefaultRecordBatch.writeEmptyHeader(buffer, RecordBatch.MAGIC_VALUE_V2, 1L, (short) 0, -1, 0, 0, RecordBatch.NO_PARTITION_LEADER_EPOCH, TimestampType.CREATE_TIME, time.milliseconds(), true, true);
    currentOffset += appendTransactionalRecords(buffer, 1L, currentOffset, new SimpleRecord(time.milliseconds(), "key".getBytes(), "value".getBytes()), new SimpleRecord(time.milliseconds(), "key".getBytes(), "value".getBytes()));
    commitTransaction(buffer, 1L, currentOffset);
    buffer.flip();
    MemoryRecords records = MemoryRecords.readableRecords(buffer);
    assignFromUser(singleton(tp0));
    subscriptions.seek(tp0, 0);
    // normal fetch
    assertEquals(1, fetcher.sendFetches());
    assertFalse(fetcher.hasCompletedFetches());
    client.prepareResponse(body -> {
        FetchRequest request = (FetchRequest) body;
        assertEquals(IsolationLevel.READ_COMMITTED, request.isolationLevel());
        return true;
    }, fullFetchResponseWithAbortedTransactions(records, Collections.emptyList(), Errors.NONE, 100L, 100L, 0));
    consumerClient.poll(time.timer(0));
    assertTrue(fetcher.hasCompletedFetches());
    Map<TopicPartition, List<ConsumerRecord<byte[], byte[]>>> fetchedRecords = fetchedRecords();
    assertTrue(fetchedRecords.containsKey(tp0));
    assertEquals(fetchedRecords.get(tp0).size(), 2);
}

Example 13 with Collections.emptyList

use of java.util.Collections.emptyList in project open-kilda by telstra.

the class SwitchManager method dumpGroups.

private List<OFGroupDescStatsEntry> dumpGroups(IOFSwitch sw) {
    OFFactory ofFactory = sw.getOFFactory();
    OFGroupDescStatsRequest groupRequest = ofFactory.buildGroupDescStatsRequest().build();
    List<OFGroupDescStatsReply> replies;
    try {
        ListenableFuture<List<OFGroupDescStatsReply>> future = sw.writeStatsRequest(groupRequest);
        replies = future.get(10, TimeUnit.SECONDS);
    } catch (ExecutionException | TimeoutException e) {
        logger.error("Could not dump groups on switch {}.", sw.getId(), e);
        return Collections.emptyList();
    } catch (InterruptedException e) {
        logger.error("Could not dump groups on switch {}.", sw.getId(), e);
        Thread.currentThread().interrupt();
        return Collections.emptyList();
    }
    return replies.stream().map(OFGroupDescStatsReply::getEntries).flatMap(List::stream).collect(toList());
}