Examples with StringDeserializer org.apache.kafka.common.serialization.StringDeserializer used on opensource projects

Example 6 with StringDeserializer

use of org.apache.kafka.common.serialization.StringDeserializer in project kafka by apache.

the class KafkaConsumerTest method testInterceptorConstructorClose.

@Test
public void testInterceptorConstructorClose() throws Exception {
    try {
        Properties props = new Properties();
        // test with client ID assigned by KafkaConsumer
        props.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9999");
        props.setProperty(ConsumerConfig.INTERCEPTOR_CLASSES_CONFIG, MockConsumerInterceptor.class.getName());
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(props, new StringDeserializer(), new StringDeserializer());
        assertEquals(1, MockConsumerInterceptor.INIT_COUNT.get());
        assertEquals(0, MockConsumerInterceptor.CLOSE_COUNT.get());
        consumer.close();
        assertEquals(1, MockConsumerInterceptor.INIT_COUNT.get());
        assertEquals(1, MockConsumerInterceptor.CLOSE_COUNT.get());
        // Cluster metadata will only be updated on calling poll.
        Assert.assertNull(MockConsumerInterceptor.CLUSTER_META.get());
    } finally {
        // cleanup since we are using mutable static variables in MockConsumerInterceptor
        MockConsumerInterceptor.resetCounters();
    }
}

Example 7 with StringDeserializer

use of org.apache.kafka.common.serialization.StringDeserializer in project kafka by apache.

the class KStreamAggregationDedupIntegrationTest method shouldReduceWindowed.

@Test
public void shouldReduceWindowed() throws Exception {
    long firstBatchTimestamp = System.currentTimeMillis() - 1000;
    produceMessages(firstBatchTimestamp);
    long secondBatchTimestamp = System.currentTimeMillis();
    produceMessages(secondBatchTimestamp);
    produceMessages(secondBatchTimestamp);
    groupedStream.reduce(reducer, TimeWindows.of(500L), "reduce-time-windows").toStream(new KeyValueMapper<Windowed<String>, String, String>() {

        @Override
        public String apply(Windowed<String> windowedKey, String value) {
            return windowedKey.key() + "@" + windowedKey.window().start();
        }
    }).to(Serdes.String(), Serdes.String(), outputTopic);
    startStreams();
    List<KeyValue<String, String>> windowedOutput = receiveMessages(new StringDeserializer(), new StringDeserializer(), 10);
    Comparator<KeyValue<String, String>> comparator = new Comparator<KeyValue<String, String>>() {

        @Override
        public int compare(final KeyValue<String, String> o1, final KeyValue<String, String> o2) {
            return KStreamAggregationDedupIntegrationTest.compare(o1, o2);
        }
    };
    Collections.sort(windowedOutput, comparator);
    long firstBatchWindow = firstBatchTimestamp / 500 * 500;
    long secondBatchWindow = secondBatchTimestamp / 500 * 500;
    assertThat(windowedOutput, is(Arrays.asList(new KeyValue<>("A@" + firstBatchWindow, "A"), new KeyValue<>("A@" + secondBatchWindow, "A:A"), new KeyValue<>("B@" + firstBatchWindow, "B"), new KeyValue<>("B@" + secondBatchWindow, "B:B"), new KeyValue<>("C@" + firstBatchWindow, "C"), new KeyValue<>("C@" + secondBatchWindow, "C:C"), new KeyValue<>("D@" + firstBatchWindow, "D"), new KeyValue<>("D@" + secondBatchWindow, "D:D"), new KeyValue<>("E@" + firstBatchWindow, "E"), new KeyValue<>("E@" + secondBatchWindow, "E:E"))));
}

Example 8 with StringDeserializer

use of org.apache.kafka.common.serialization.StringDeserializer in project kafka by apache.

the class KStreamAggregationIntegrationTest method shouldAggregate.

@Test
public void shouldAggregate() throws Exception {
    produceMessages(mockTime.milliseconds());
    groupedStream.aggregate(initializer, aggregator, Serdes.Integer(), "aggregate-by-selected-key").to(Serdes.String(), Serdes.Integer(), outputTopic);
    startStreams();
    produceMessages(mockTime.milliseconds());
    final List<KeyValue<String, Integer>> results = receiveMessages(new StringDeserializer(), new IntegerDeserializer(), 10);
    Collections.sort(results, new Comparator<KeyValue<String, Integer>>() {

        @Override
        public int compare(final KeyValue<String, Integer> o1, final KeyValue<String, Integer> o2) {
            return KStreamAggregationIntegrationTest.compare(o1, o2);
        }
    });
    assertThat(results, is(Arrays.asList(KeyValue.pair("A", 1), KeyValue.pair("A", 2), KeyValue.pair("B", 1), KeyValue.pair("B", 2), KeyValue.pair("C", 1), KeyValue.pair("C", 2), KeyValue.pair("D", 1), KeyValue.pair("D", 2), KeyValue.pair("E", 1), KeyValue.pair("E", 2))));
}

Example 9 with StringDeserializer

use of org.apache.kafka.common.serialization.StringDeserializer in project kafka by apache.

the class KStreamAggregationIntegrationTest method shouldReduce.

@Test
public void shouldReduce() throws Exception {
    produceMessages(mockTime.milliseconds());
    groupedStream.reduce(reducer, "reduce-by-key").to(Serdes.String(), Serdes.String(), outputTopic);
    startStreams();
    produceMessages(mockTime.milliseconds());
    final List<KeyValue<String, String>> results = receiveMessages(new StringDeserializer(), new StringDeserializer(), 10);
    Collections.sort(results, new Comparator<KeyValue<String, String>>() {

        @Override
        public int compare(final KeyValue<String, String> o1, final KeyValue<String, String> o2) {
            return KStreamAggregationIntegrationTest.compare(o1, o2);
        }
    });
    assertThat(results, is(Arrays.asList(KeyValue.pair("A", "A"), KeyValue.pair("A", "A:A"), KeyValue.pair("B", "B"), KeyValue.pair("B", "B:B"), KeyValue.pair("C", "C"), KeyValue.pair("C", "C:C"), KeyValue.pair("D", "D"), KeyValue.pair("D", "D:D"), KeyValue.pair("E", "E"), KeyValue.pair("E", "E:E"))));
}

Example 10 with StringDeserializer

use of org.apache.kafka.common.serialization.StringDeserializer in project kafka by apache.

the class KStreamAggregationIntegrationTest method shouldGroupByKey.

@Test
public void shouldGroupByKey() throws Exception {
    final long timestamp = mockTime.milliseconds();
    produceMessages(timestamp);
    produceMessages(timestamp);
    stream.groupByKey(Serdes.Integer(), Serdes.String()).count(TimeWindows.of(500L), "count-windows").toStream(new KeyValueMapper<Windowed<Integer>, Long, String>() {

        @Override
        public String apply(final Windowed<Integer> windowedKey, final Long value) {
            return windowedKey.key() + "@" + windowedKey.window().start();
        }
    }).to(Serdes.String(), Serdes.Long(), outputTopic);
    startStreams();
    final List<KeyValue<String, Long>> results = receiveMessages(new StringDeserializer(), new LongDeserializer(), 10);
    Collections.sort(results, new Comparator<KeyValue<String, Long>>() {

        @Override
        public int compare(final KeyValue<String, Long> o1, final KeyValue<String, Long> o2) {
            return KStreamAggregationIntegrationTest.compare(o1, o2);
        }
    });
    final long window = timestamp / 500 * 500;
    assertThat(results, is(Arrays.asList(KeyValue.pair("1@" + window, 1L), KeyValue.pair("1@" + window, 2L), KeyValue.pair("2@" + window, 1L), KeyValue.pair("2@" + window, 2L), KeyValue.pair("3@" + window, 1L), KeyValue.pair("3@" + window, 2L), KeyValue.pair("4@" + window, 1L), KeyValue.pair("4@" + window, 2L), KeyValue.pair("5@" + window, 1L), KeyValue.pair("5@" + window, 2L))));
}