Examples with KsqlRequest io.confluent.ksql.rest.entity.KsqlRequest used on opensource projects

Example 11 with KsqlRequest

use of io.confluent.ksql.rest.entity.KsqlRequest in project ksql by confluentinc.

the class StreamedQueryResourceTest method testStreamQuery.

@Test
public void testStreamQuery() throws Throwable {
    final AtomicReference<Throwable> threadException = new AtomicReference<>(null);
    final Thread.UncaughtExceptionHandler threadExceptionHandler = (thread, exception) -> threadException.compareAndSet(null, exception);
    final String queryString = "SELECT * FROM test_stream;";
    final SynchronousQueue<KeyValue<String, GenericRow>> rowQueue = new SynchronousQueue<>();
    final LinkedList<GenericRow> writtenRows = new LinkedList<>();
    final Thread rowQueuePopulatorThread = new Thread(new Runnable() {

        @Override
        public void run() {
            try {
                for (int i = 0; ; i++) {
                    String key = Integer.toString(i);
                    GenericRow value = new GenericRow(Collections.singletonList(i));
                    synchronized (writtenRows) {
                        writtenRows.add(value);
                    }
                    rowQueue.put(new KeyValue<>(key, value));
                }
            } catch (InterruptedException exception) {
            // This should happen during the test, so it's fine
            }
        }
    }, "Row Queue Populator");
    rowQueuePopulatorThread.setUncaughtExceptionHandler(threadExceptionHandler);
    rowQueuePopulatorThread.start();
    final KafkaStreams mockKafkaStreams = mock(KafkaStreams.class);
    mockKafkaStreams.start();
    expectLastCall();
    mockKafkaStreams.setUncaughtExceptionHandler(anyObject(Thread.UncaughtExceptionHandler.class));
    expectLastCall();
    expect(mockKafkaStreams.state()).andReturn(KafkaStreams.State.NOT_RUNNING);
    mockKafkaStreams.close();
    expectLastCall();
    mockKafkaStreams.cleanUp();
    expectLastCall();
    final OutputNode mockOutputNode = mock(OutputNode.class);
    expect(mockOutputNode.getSchema()).andReturn(SchemaBuilder.struct().field("f1", SchemaBuilder.INT32_SCHEMA));
    final Map<String, Object> requestStreamsProperties = Collections.emptyMap();
    KsqlEngine mockKsqlEngine = mock(KsqlEngine.class);
    KafkaTopicClient mockKafkaTopicClient = mock(KafkaTopicClientImpl.class);
    expect(mockKsqlEngine.getTopicClient()).andReturn(mockKafkaTopicClient);
    final QueuedQueryMetadata queuedQueryMetadata = new QueuedQueryMetadata(queryString, mockKafkaStreams, mockOutputNode, "", rowQueue, DataSource.DataSourceType.KSTREAM, "", mockKafkaTopicClient, null);
    expect(mockKsqlEngine.buildMultipleQueries(queryString, requestStreamsProperties)).andReturn(Collections.singletonList(queuedQueryMetadata));
    mockKsqlEngine.removeTemporaryQuery(queuedQueryMetadata);
    expectLastCall();
    StatementParser mockStatementParser = mock(StatementParser.class);
    expect(mockStatementParser.parseSingleStatement(queryString)).andReturn(mock(Query.class));
    replay(mockKsqlEngine, mockStatementParser, mockKafkaStreams, mockOutputNode);
    StreamedQueryResource testResource = new StreamedQueryResource(mockKsqlEngine, mockStatementParser, 1000);
    Response response = testResource.streamQuery(new KsqlRequest(queryString, requestStreamsProperties));
    PipedOutputStream responseOutputStream = new EOFPipedOutputStream();
    PipedInputStream responseInputStream = new PipedInputStream(responseOutputStream, 1);
    StreamingOutput responseStream = (StreamingOutput) response.getEntity();
    final Thread queryWriterThread = new Thread(new Runnable() {

        @Override
        public void run() {
            try {
                responseStream.write(responseOutputStream);
            } catch (EOFException exception) {
            // It's fine
            } catch (IOException exception) {
                throw new RuntimeException(exception);
            }
        }
    }, "Query Writer");
    queryWriterThread.setUncaughtExceptionHandler(threadExceptionHandler);
    queryWriterThread.start();
    Scanner responseScanner = new Scanner(responseInputStream);
    ObjectMapper objectMapper = new ObjectMapper();
    for (int i = 0; i < 5; i++) {
        if (!responseScanner.hasNextLine()) {
            throw new Exception("Response input stream failed to have expected line available");
        }
        String responseLine = responseScanner.nextLine();
        if (responseLine.trim().isEmpty()) {
            i--;
        } else {
            GenericRow expectedRow;
            synchronized (writtenRows) {
                expectedRow = writtenRows.poll();
            }
            GenericRow testRow = objectMapper.readValue(responseLine, StreamedRow.class).getRow();
            assertEquals(expectedRow, testRow);
        }
    }
    responseOutputStream.close();
    queryWriterThread.join();
    rowQueuePopulatorThread.interrupt();
    rowQueuePopulatorThread.join();
    // Definitely want to make sure that the Kafka Streams instance has been closed and cleaned up
    verify(mockKafkaStreams);
    // If one of the other threads has somehow managed to throw an exception without breaking things up until this
    // point, we throw that exception now in the main thread and cause the test to fail
    Throwable exception = threadException.get();
    if (exception != null) {
        throw exception;
    }
}