io.vertx.reactivex.kafka.client.consumer

## Class KafkaConsumer<K,V>

- java.lang.Object
- - io.vertx.reactivex.kafka.client.consumer.KafkaConsumer<K,V>

- All Implemented Interfaces:
    ReadStream<KafkaConsumerRecord<K,V>>, StreamBase

      public class KafkaConsumer<K,V>
      extends Object
      implements ReadStream<KafkaConsumerRecord<K,V>>

  Vert.x Kafka consumer.

  You receive Kafka records by providing a `handler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecord<K, V>>)`. As messages arrive the handler will be called with the records.

  The `pause()` and `resume()` provides global control over reading the records from the consumer.

  The `pause()` and `resume()` provides finer grained control over reading records for specific Topic/Partition, these are Kafka's specific operations.

  NOTE: This class has been automatically generated from the `original` non RX-ified interface using Vert.x codegen.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static <any>` | `__TYPE_ARG`
    `<any>` | `__typeArg_0`
    `<any>` | `__typeArg_1`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `KafkaConsumer(KafkaConsumer delegate)`
    `KafkaConsumer(KafkaConsumer delegate, <any> typeArg_0, <any> typeArg_1)`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `KafkaConsumer<K,V>` | `assign(Set<TopicPartition> topicPartitions)` Manually assign a list of partition to this consumer.
    `KafkaConsumer<K,V>` | `assign(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Manually assign a list of partition to this consumer.
    `KafkaConsumer<K,V>` | `assign(TopicPartition topicPartition)` Manually assign a partition to this consumer.
    `KafkaConsumer<K,V>` | `assign(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Manually assign a partition to this consumer.
    `KafkaConsumer<K,V>` | `assignment(Handler<AsyncResult<Set<TopicPartition>>> handler)` Get the set of partitions currently assigned to this consumer.
    `KafkaConsumer<K,V>` | `batchHandler(Handler<KafkaConsumerRecords<K,V>> handler)` Set the handler to be used when batches of messages are fetched from the Kafka server.
    `void` | `beginningOffsets(TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the first offset for the given partitions.
    `void` | `close()` Close the consumer
    `void` | `close(Handler<AsyncResult<Void>> completionHandler)` Close the consumer
    `void` | `commit()` Commit current offsets for all the subscribed list of topics and partition.
    `void` | `commit(Handler<AsyncResult<Void>> completionHandler)` Commit current offsets for all the subscribed list of topics and partition.
    `void` | `committed(TopicPartition topicPartition, Handler<AsyncResult<OffsetAndMetadata>> handler)` Get the last committed offset for the given partition (whether the commit happened by this process or another).
    `static <K,V> KafkaConsumer<K,V>` | `create(Vertx vertx, Map<String,String> config)` Create a new KafkaConsumer instance
    `static <K,V> KafkaConsumer<K,V>` | `create(Vertx vertx, Map<String,String> config, Class<K> keyType, Class<V> valueType)` Create a new KafkaConsumer instance
    `KafkaConsumer<K,V>` | `endHandler(Handler<Void> endHandler)` Set an end handler.
    `void` | `endOffsets(TopicPartition topicPartition, Handler<AsyncResult<Long>> handler)` Get the last offset for the given partition.
    `boolean` | `equals(Object o)`
    `KafkaConsumer<K,V>` | `exceptionHandler(Handler<Throwable> handler)` Set an exception handler on the read stream.
    `ReadStream<KafkaConsumerRecord<K,V>>` | `fetch(long amount)` Fetch the specified `amount` of elements.
    `KafkaConsumer` | `getDelegate()`
    `KafkaConsumer<K,V>` | `handler(Handler<KafkaConsumerRecord<K,V>> handler)` Set a data handler.
    `int` | `hashCode()`
    `static <K,V> KafkaConsumer<K,V>` | `newInstance(KafkaConsumer arg)`
    `static <K,V> KafkaConsumer<K,V>` | `newInstance(KafkaConsumer arg, <any> __typeArg_K, <any> __typeArg_V)`
    `void` | `offsetsForTimes(TopicPartition topicPartition, Long timestamp, Handler<AsyncResult<OffsetAndTimestamp>> handler)` Look up the offset for the given partition by timestamp.
    `KafkaConsumer<K,V>` | `partitionsAssignedHandler(Handler<Set<TopicPartition>> handler)` Set the handler called when topic partitions are assigned to the consumer
    `KafkaConsumer<K,V>` | `partitionsFor(String topic, Handler<AsyncResult<List<PartitionInfo>>> handler)` Get metadata about the partitions for a given topic.
    `KafkaConsumer<K,V>` | `partitionsRevokedHandler(Handler<Set<TopicPartition>> handler)` Set the handler called when topic partitions are revoked to the consumer
    `KafkaConsumer<K,V>` | `pause()` Pause the `ReadStream`, it sets the buffer in `fetch` mode and clears the actual demand.
    `KafkaConsumer<K,V>` | `pause(Set<TopicPartition> topicPartitions)` Suspend fetching from the requested partitions.
    `KafkaConsumer<K,V>` | `pause(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Suspend fetching from the requested partitions.
    `KafkaConsumer<K,V>` | `pause(TopicPartition topicPartition)` Suspend fetching from the requested partition.
    `KafkaConsumer<K,V>` | `pause(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Suspend fetching from the requested partition.
    `void` | `paused(Handler<AsyncResult<Set<TopicPartition>>> handler)` Get the set of partitions that were previously paused by a call to pause(Set).
    `void` | `poll(long timeout, Handler<AsyncResult<KafkaConsumerRecords<K,V>>> handler)` Executes a poll for getting messages from Kafka
    `KafkaConsumer<K,V>` | `pollTimeout(long timeout)` Sets the poll timeout (in ms) for the underlying native Kafka Consumer.
    `void` | `position(TopicPartition partition, Handler<AsyncResult<Long>> handler)` Get the offset of the next record that will be fetched (if a record with that offset exists).
    `KafkaConsumer<K,V>` | `resume()` Resume reading, and sets the buffer in `flowing` mode.
    `KafkaConsumer<K,V>` | `resume(Set<TopicPartition> topicPartitions)` Resume specified partitions which have been paused with pause.
    `KafkaConsumer<K,V>` | `resume(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Resume specified partitions which have been paused with pause.
    `KafkaConsumer<K,V>` | `resume(TopicPartition topicPartition)` Resume specified partition which have been paused with pause.
    `KafkaConsumer<K,V>` | `resume(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Resume specified partition which have been paused with pause.
    `Completable` | `rxAssign(Set<TopicPartition> topicPartitions)` Manually assign a list of partition to this consumer.
    `Completable` | `rxAssign(TopicPartition topicPartition)` Manually assign a partition to this consumer.
    `Single<Set<TopicPartition>>` | `rxAssignment()` Get the set of partitions currently assigned to this consumer.
    `Single<Long>` | `rxBeginningOffsets(TopicPartition topicPartition)` Get the first offset for the given partitions.
    `Completable` | `rxClose()` Close the consumer
    `Completable` | `rxCommit()` Commit current offsets for all the subscribed list of topics and partition.
    `Single<OffsetAndMetadata>` | `rxCommitted(TopicPartition topicPartition)` Get the last committed offset for the given partition (whether the commit happened by this process or another).
    `Single<Long>` | `rxEndOffsets(TopicPartition topicPartition)` Get the last offset for the given partition.
    `Single<OffsetAndTimestamp>` | `rxOffsetsForTimes(TopicPartition topicPartition, Long timestamp)` Look up the offset for the given partition by timestamp.
    `Single<List<PartitionInfo>>` | `rxPartitionsFor(String topic)` Get metadata about the partitions for a given topic.
    `Completable` | `rxPause(Set<TopicPartition> topicPartitions)` Suspend fetching from the requested partitions.
    `Completable` | `rxPause(TopicPartition topicPartition)` Suspend fetching from the requested partition.
    `Single<Set<TopicPartition>>` | `rxPaused()` Get the set of partitions that were previously paused by a call to pause(Set).
    `Single<KafkaConsumerRecords<K,V>>` | `rxPoll(long timeout)` Executes a poll for getting messages from Kafka
    `Single<Long>` | `rxPosition(TopicPartition partition)` Get the offset of the next record that will be fetched (if a record with that offset exists).
    `Completable` | `rxResume(Set<TopicPartition> topicPartitions)` Resume specified partitions which have been paused with pause.
    `Completable` | `rxResume(TopicPartition topicPartition)` Resume specified partition which have been paused with pause.
    `Completable` | `rxSeek(TopicPartition topicPartition, long offset)` Overrides the fetch offsets that the consumer will use on the next poll.
    `Completable` | `rxSeekToBeginning(Set<TopicPartition> topicPartitions)` Seek to the first offset for each of the given partitions.
    `Completable` | `rxSeekToBeginning(TopicPartition topicPartition)` Seek to the first offset for each of the given partition.
    `Completable` | `rxSeekToEnd(Set<TopicPartition> topicPartitions)` Seek to the last offset for each of the given partitions.
    `Completable` | `rxSeekToEnd(TopicPartition topicPartition)` Seek to the last offset for each of the given partition.
    `Completable` | `rxSubscribe(Set<String> topics)` Subscribe to the given list of topics to get dynamically assigned partitions.
    `Completable` | `rxSubscribe(String topic)` Subscribe to the given topic to get dynamically assigned partitions.
    `Single<Set<String>>` | `rxSubscription()` Get the current subscription.
    `Completable` | `rxUnsubscribe()` Unsubscribe from topics currently subscribed with subscribe.
    `KafkaConsumer<K,V>` | `seek(TopicPartition topicPartition, long offset)` Overrides the fetch offsets that the consumer will use on the next poll.
    `KafkaConsumer<K,V>` | `seek(TopicPartition topicPartition, long offset, Handler<AsyncResult<Void>> completionHandler)` Overrides the fetch offsets that the consumer will use on the next poll.
    `KafkaConsumer<K,V>` | `seekToBeginning(Set<TopicPartition> topicPartitions)` Seek to the first offset for each of the given partitions.
    `KafkaConsumer<K,V>` | `seekToBeginning(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the first offset for each of the given partitions.
    `KafkaConsumer<K,V>` | `seekToBeginning(TopicPartition topicPartition)` Seek to the first offset for each of the given partition.
    `KafkaConsumer<K,V>` | `seekToBeginning(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Seek to the first offset for each of the given partition.
    `KafkaConsumer<K,V>` | `seekToEnd(Set<TopicPartition> topicPartitions)` Seek to the last offset for each of the given partitions.
    `KafkaConsumer<K,V>` | `seekToEnd(Set<TopicPartition> topicPartitions, Handler<AsyncResult<Void>> completionHandler)` Seek to the last offset for each of the given partitions.
    `KafkaConsumer<K,V>` | `seekToEnd(TopicPartition topicPartition)` Seek to the last offset for each of the given partition.
    `KafkaConsumer<K,V>` | `seekToEnd(TopicPartition topicPartition, Handler<AsyncResult<Void>> completionHandler)` Seek to the last offset for each of the given partition.
    `KafkaConsumer<K,V>` | `subscribe(Set<String> topics)` Subscribe to the given list of topics to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | `subscribe(Set<String> topics, Handler<AsyncResult<Void>> completionHandler)` Subscribe to the given list of topics to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | `subscribe(String topic)` Subscribe to the given topic to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | `subscribe(String topic, Handler<AsyncResult<Void>> completionHandler)` Subscribe to the given topic to get dynamically assigned partitions.
    `KafkaConsumer<K,V>` | `subscription(Handler<AsyncResult<Set<String>>> handler)` Get the current subscription.
    `Flowable<KafkaConsumerRecord<K,V>>` | `toFlowable()`
    `Observable<KafkaConsumerRecord<K,V>>` | `toObservable()`
    `String` | `toString()`
    `KafkaConsumer<K,V>` | `unsubscribe()` Unsubscribe from topics currently subscribed with subscribe.
    `KafkaConsumer<K,V>` | `unsubscribe(Handler<AsyncResult<Void>> completionHandler)` Unsubscribe from topics currently subscribed with subscribe.

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface io.vertx.reactivex.core.streams.ReadStream

      `newInstance, newInstance`

    - ### Methods inherited from interface io.vertx.reactivex.core.streams.StreamBase

      `newInstance`

- - ### Field Detail

    - #### __TYPE_ARG

          public static final <any> __TYPE_ARG

    - #### __typeArg_0

          public final <any> __typeArg_0

    - #### __typeArg_1

          public final <any> __typeArg_1

  - ### Constructor Detail

    - #### KafkaConsumer

          public KafkaConsumer(KafkaConsumer delegate)

    - #### KafkaConsumer

          public KafkaConsumer(KafkaConsumer delegate,
                               <any> typeArg_0,
                               <any> typeArg_1)

  - ### Method Detail

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### equals

          public boolean equals(Object o)

      Overrides:
        `equals` in class `Object`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `Object`

    - #### getDelegate

          public KafkaConsumer getDelegate()

      Specified by:
        `getDelegate` in interface `ReadStream<KafkaConsumerRecord<K,V>>`
      Specified by:
        `getDelegate` in interface `StreamBase`

    - #### toObservable

          public Observable<KafkaConsumerRecord<K,V>> toObservable()

      Specified by:
        `toObservable` in interface `ReadStream<KafkaConsumerRecord<K,V>>`

    - #### toFlowable

          public Flowable<KafkaConsumerRecord<K,V>> toFlowable()

      Specified by:
        `toFlowable` in interface `ReadStream<KafkaConsumerRecord<K,V>>`

    - #### fetch

          public ReadStream<KafkaConsumerRecord<K,V>> fetch(long amount)

      Fetch the specified `amount` of elements. If the `ReadStream` has been paused, reading will recommence with the specified `amount` of items, otherwise the specified `amount` will be added to the current stream demand.
      Specified by:
        `fetch` in interface `ReadStream<KafkaConsumerRecord<K,V>>`
      Parameters:
        `amount` -
      Returns:
        a reference to this, so the API can be used fluently

    - #### create

          public static <K,V> KafkaConsumer<K,V> create(Vertx vertx,
                                                        Map<String,String> config)

      Create a new KafkaConsumer instance
      Parameters:
        `vertx` - Vert.x instance to use
        `config` - Kafka consumer configuration
      Returns:
        an instance of the KafkaConsumer

    - #### create

          public static <K,V> KafkaConsumer<K,V> create(Vertx vertx,
                                                        Map<String,String> config,
                                                        Class<K> keyType,
                                                        Class<V> valueType)

      Create a new KafkaConsumer instance
      Parameters:
        `vertx` - Vert.x instance to use
        `config` - Kafka consumer configuration
        `keyType` - class type for the key deserialization
        `valueType` - class type for the value deserialization
      Returns:
        an instance of the KafkaConsumer

    - #### exceptionHandler

          public KafkaConsumer<K,V> exceptionHandler(Handler<Throwable> handler)

      Description copied from interface: `ReadStream`
      Set an exception handler on the read stream.
      Specified by:
        `exceptionHandler` in interface `ReadStream<KafkaConsumerRecord<K,V>>`
      Specified by:
        `exceptionHandler` in interface `StreamBase`
      Parameters:
        `handler` - the exception handler
      Returns:
        a reference to this, so the API can be used fluently

    - #### handler

          public KafkaConsumer<K,V> handler(Handler<KafkaConsumerRecord<K,V>> handler)

      Description copied from interface: `ReadStream`
      Set a data handler. As data is read, the handler will be called with the data.
      Specified by:
        `handler` in interface `ReadStream<KafkaConsumerRecord<K,V>>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### pause

          public KafkaConsumer<K,V> pause()

      Description copied from interface: `ReadStream`
      Pause the `ReadStream`, it sets the buffer in `fetch` mode and clears the actual demand.

      While it's paused, no data will be sent to the data `handler`.

      Specified by:
        `pause` in interface `ReadStream<KafkaConsumerRecord<K,V>>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### resume

          public KafkaConsumer<K,V> resume()

      Description copied from interface: `ReadStream`
      Resume reading, and sets the buffer in `flowing` mode.

      If the `ReadStream` has been paused, reading will recommence on it.
      Specified by:
        `resume` in interface `ReadStream<KafkaConsumerRecord<K,V>>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### endHandler

          public KafkaConsumer<K,V> endHandler(Handler<Void> endHandler)

      Description copied from interface: `ReadStream`
      Set an end handler. Once the stream has ended, and there is no more data to be read, this handler will be called.
      Specified by:
        `endHandler` in interface `ReadStream<KafkaConsumerRecord<K,V>>`
      Returns:
        a reference to this, so the API can be used fluently

    - #### subscribe

          public KafkaConsumer<K,V> subscribe(String topic)

      Subscribe to the given topic to get dynamically assigned partitions.
      Parameters:
        `topic` - topic to subscribe to
      Returns:
        current KafkaConsumer instance

    - #### subscribe

          public KafkaConsumer<K,V> subscribe(Set<String> topics)

      Subscribe to the given list of topics to get dynamically assigned partitions.
      Parameters:
        `topics` - topics to subscribe to
      Returns:
        current KafkaConsumer instance

    - #### subscribe

          public KafkaConsumer<K,V> subscribe(String topic,
                                              Handler<AsyncResult<Void>> completionHandler)

      Subscribe to the given topic to get dynamically assigned partitions.

      Due to internal buffering of messages, when changing the subscribed topic the old topic may remain in effect (as observed by the record handler}) until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new topic.

      Parameters:
        `topic` - topic to subscribe to
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSubscribe

          public Completable rxSubscribe(String topic)

      Subscribe to the given topic to get dynamically assigned partitions.

      Due to internal buffering of messages, when changing the subscribed topic the old topic may remain in effect (as observed by the record handler}) until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new topic.

      Parameters:
        `topic` - topic to subscribe to
      Returns:
        current KafkaConsumer instance

    - #### subscribe

          public KafkaConsumer<K,V> subscribe(Set<String> topics,
                                              Handler<AsyncResult<Void>> completionHandler)

      Subscribe to the given list of topics to get dynamically assigned partitions.

      Due to internal buffering of messages, when changing the subscribed topics the old set of topics may remain in effect (as observed by the record handler}) until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new set of topics.

      Parameters:
        `topics` - topics to subscribe to
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSubscribe

          public Completable rxSubscribe(Set<String> topics)

      Subscribe to the given list of topics to get dynamically assigned partitions.

      Due to internal buffering of messages, when changing the subscribed topics the old set of topics may remain in effect (as observed by the record handler}) until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new set of topics.

      Parameters:
        `topics` - topics to subscribe to
      Returns:
        current KafkaConsumer instance

    - #### assign

          public KafkaConsumer<K,V> assign(TopicPartition topicPartition)

      Manually assign a partition to this consumer.
      Parameters:
        `topicPartition` - partition which want assigned
      Returns:
        current KafkaConsumer instance

    - #### assign

          public KafkaConsumer<K,V> assign(Set<TopicPartition> topicPartitions)

      Manually assign a list of partition to this consumer.
      Parameters:
        `topicPartitions` - partitions which want assigned
      Returns:
        current KafkaConsumer instance

    - #### assign

          public KafkaConsumer<K,V> assign(TopicPartition topicPartition,
                                           Handler<AsyncResult<Void>> completionHandler)

      Manually assign a partition to this consumer.

      Due to internal buffering of messages, when reassigning the old partition may remain in effect (as observed by the record handler)} until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new partition.

      Parameters:
        `topicPartition` - partition which want assigned
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxAssign

          public Completable rxAssign(TopicPartition topicPartition)

      Manually assign a partition to this consumer.

      Due to internal buffering of messages, when reassigning the old partition may remain in effect (as observed by the record handler)} until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new partition.

      Parameters:
        `topicPartition` - partition which want assigned
      Returns:
        current KafkaConsumer instance

    - #### assign

          public KafkaConsumer<K,V> assign(Set<TopicPartition> topicPartitions,
                                           Handler<AsyncResult<Void>> completionHandler)

      Manually assign a list of partition to this consumer.

      Due to internal buffering of messages, when reassigning the old set of partitions may remain in effect (as observed by the record handler)} until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new set of partitions.

      Parameters:
        `topicPartitions` - partitions which want assigned
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxAssign

          public Completable rxAssign(Set<TopicPartition> topicPartitions)

      Manually assign a list of partition to this consumer.

      Due to internal buffering of messages, when reassigning the old set of partitions may remain in effect (as observed by the record handler)} until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new set of partitions.

      Parameters:
        `topicPartitions` - partitions which want assigned
      Returns:
        current KafkaConsumer instance

    - #### assignment

          public KafkaConsumer<K,V> assignment(Handler<AsyncResult<Set<TopicPartition>>> handler)

      Get the set of partitions currently assigned to this consumer.
      Parameters:
        `handler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxAssignment

          public Single<Set<TopicPartition>> rxAssignment()

      Get the set of partitions currently assigned to this consumer.
      Returns:
        current KafkaConsumer instance

    - #### unsubscribe

          public KafkaConsumer<K,V> unsubscribe()

      Unsubscribe from topics currently subscribed with subscribe.
      Returns:
        current KafkaConsumer instance

    - #### unsubscribe

          public KafkaConsumer<K,V> unsubscribe(Handler<AsyncResult<Void>> completionHandler)

      Unsubscribe from topics currently subscribed with subscribe.
      Parameters:
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxUnsubscribe

          public Completable rxUnsubscribe()

      Unsubscribe from topics currently subscribed with subscribe.
      Returns:
        current KafkaConsumer instance

    - #### subscription

          public KafkaConsumer<K,V> subscription(Handler<AsyncResult<Set<String>>> handler)

      Get the current subscription.
      Parameters:
        `handler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSubscription

          public Single<Set<String>> rxSubscription()

      Get the current subscription.
      Returns:
        current KafkaConsumer instance

    - #### pause

          public KafkaConsumer<K,V> pause(TopicPartition topicPartition)

      Suspend fetching from the requested partition.
      Parameters:
        `topicPartition` - topic partition from which suspend fetching
      Returns:
        current KafkaConsumer instance

    - #### pause

          public KafkaConsumer<K,V> pause(Set<TopicPartition> topicPartitions)

      Suspend fetching from the requested partitions.
      Parameters:
        `topicPartitions` - topic partition from which suspend fetching
      Returns:
        current KafkaConsumer instance

    - #### pause

          public KafkaConsumer<K,V> pause(TopicPartition topicPartition,
                                          Handler<AsyncResult<Void>> completionHandler)

      Suspend fetching from the requested partition.

      Due to internal buffering of messages, the will continue to observe messages from the given `topicPartition` until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will not see messages from the given `topicPartition`.

      Parameters:
        `topicPartition` - topic partition from which suspend fetching
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxPause

          public Completable rxPause(TopicPartition topicPartition)

      Suspend fetching from the requested partition.

      Due to internal buffering of messages, the will continue to observe messages from the given `topicPartition` until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will not see messages from the given `topicPartition`.

      Parameters:
        `topicPartition` - topic partition from which suspend fetching
      Returns:
        current KafkaConsumer instance

    - #### pause

          public KafkaConsumer<K,V> pause(Set<TopicPartition> topicPartitions,
                                          Handler<AsyncResult<Void>> completionHandler)

      Suspend fetching from the requested partitions.

      Due to internal buffering of messages, the will continue to observe messages from the given `topicPartitions` until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will not see messages from the given `topicPartitions`.

      Parameters:
        `topicPartitions` - topic partition from which suspend fetching
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxPause

          public Completable rxPause(Set<TopicPartition> topicPartitions)

      Suspend fetching from the requested partitions.

      Due to internal buffering of messages, the will continue to observe messages from the given `topicPartitions` until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will not see messages from the given `topicPartitions`.

      Parameters:
        `topicPartitions` - topic partition from which suspend fetching
      Returns:
        current KafkaConsumer instance

    - #### paused

          public void paused(Handler<AsyncResult<Set<TopicPartition>>> handler)

      Get the set of partitions that were previously paused by a call to pause(Set).
      Parameters:
        `handler` - handler called on operation completed

    - #### rxPaused

          public Single<Set<TopicPartition>> rxPaused()

      Get the set of partitions that were previously paused by a call to pause(Set).
      Returns:

    - #### resume

          public KafkaConsumer<K,V> resume(TopicPartition topicPartition)

      Resume specified partition which have been paused with pause.
      Parameters:
        `topicPartition` - topic partition from which resume fetching
      Returns:
        current KafkaConsumer instance

    - #### resume

          public KafkaConsumer<K,V> resume(Set<TopicPartition> topicPartitions)

      Resume specified partitions which have been paused with pause.
      Parameters:
        `topicPartitions` - topic partition from which resume fetching
      Returns:
        current KafkaConsumer instance

    - #### resume

          public KafkaConsumer<K,V> resume(TopicPartition topicPartition,
                                           Handler<AsyncResult<Void>> completionHandler)

      Resume specified partition which have been paused with pause.
      Parameters:
        `topicPartition` - topic partition from which resume fetching
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxResume

          public Completable rxResume(TopicPartition topicPartition)

      Resume specified partition which have been paused with pause.
      Parameters:
        `topicPartition` - topic partition from which resume fetching
      Returns:
        current KafkaConsumer instance

    - #### resume

          public KafkaConsumer<K,V> resume(Set<TopicPartition> topicPartitions,
                                           Handler<AsyncResult<Void>> completionHandler)

      Resume specified partitions which have been paused with pause.
      Parameters:
        `topicPartitions` - topic partition from which resume fetching
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxResume

          public Completable rxResume(Set<TopicPartition> topicPartitions)

      Resume specified partitions which have been paused with pause.
      Parameters:
        `topicPartitions` - topic partition from which resume fetching
      Returns:
        current KafkaConsumer instance

    - #### partitionsRevokedHandler

          public KafkaConsumer<K,V> partitionsRevokedHandler(Handler<Set<TopicPartition>> handler)

      Set the handler called when topic partitions are revoked to the consumer
      Parameters:
        `handler` - handler called on revoked topic partitions
      Returns:
        current KafkaConsumer instance

    - #### partitionsAssignedHandler

          public KafkaConsumer<K,V> partitionsAssignedHandler(Handler<Set<TopicPartition>> handler)

      Set the handler called when topic partitions are assigned to the consumer
      Parameters:
        `handler` - handler called on assigned topic partitions
      Returns:
        current KafkaConsumer instance

    - #### seek

          public KafkaConsumer<K,V> seek(TopicPartition topicPartition,
                                         long offset)

      Overrides the fetch offsets that the consumer will use on the next poll.
      Parameters:
        `topicPartition` - topic partition for which seek
        `offset` - offset to seek inside the topic partition
      Returns:
        current KafkaConsumer instance

    - #### seek

          public KafkaConsumer<K,V> seek(TopicPartition topicPartition,
                                         long offset,
                                         Handler<AsyncResult<Void>> completionHandler)

      Overrides the fetch offsets that the consumer will use on the next poll.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartition` - topic partition for which seek
        `offset` - offset to seek inside the topic partition
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSeek

          public Completable rxSeek(TopicPartition topicPartition,
                                    long offset)

      Overrides the fetch offsets that the consumer will use on the next poll.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartition` - topic partition for which seek
        `offset` - offset to seek inside the topic partition
      Returns:
        current KafkaConsumer instance

    - #### seekToBeginning

          public KafkaConsumer<K,V> seekToBeginning(TopicPartition topicPartition)

      Seek to the first offset for each of the given partition.
      Parameters:
        `topicPartition` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### seekToBeginning

          public KafkaConsumer<K,V> seekToBeginning(Set<TopicPartition> topicPartitions)

      Seek to the first offset for each of the given partitions.
      Parameters:
        `topicPartitions` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### seekToBeginning

          public KafkaConsumer<K,V> seekToBeginning(TopicPartition topicPartition,
                                                    Handler<AsyncResult<Void>> completionHandler)

      Seek to the first offset for each of the given partition.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartition` - topic partition for which seek
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSeekToBeginning

          public Completable rxSeekToBeginning(TopicPartition topicPartition)

      Seek to the first offset for each of the given partition.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartition` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### seekToBeginning

          public KafkaConsumer<K,V> seekToBeginning(Set<TopicPartition> topicPartitions,
                                                    Handler<AsyncResult<Void>> completionHandler)

      Seek to the first offset for each of the given partitions.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartitions` - topic partition for which seek
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSeekToBeginning

          public Completable rxSeekToBeginning(Set<TopicPartition> topicPartitions)

      Seek to the first offset for each of the given partitions.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartitions` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### seekToEnd

          public KafkaConsumer<K,V> seekToEnd(TopicPartition topicPartition)

      Seek to the last offset for each of the given partition.
      Parameters:
        `topicPartition` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### seekToEnd

          public KafkaConsumer<K,V> seekToEnd(Set<TopicPartition> topicPartitions)

      Seek to the last offset for each of the given partitions.
      Parameters:
        `topicPartitions` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### seekToEnd

          public KafkaConsumer<K,V> seekToEnd(TopicPartition topicPartition,
                                              Handler<AsyncResult<Void>> completionHandler)

      Seek to the last offset for each of the given partition.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartition` - topic partition for which seek
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSeekToEnd

          public Completable rxSeekToEnd(TopicPartition topicPartition)

      Seek to the last offset for each of the given partition.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartition` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### seekToEnd

          public KafkaConsumer<K,V> seekToEnd(Set<TopicPartition> topicPartitions,
                                              Handler<AsyncResult<Void>> completionHandler)

      Seek to the last offset for each of the given partitions.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartitions` - topic partition for which seek
        `completionHandler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxSeekToEnd

          public Completable rxSeekToEnd(Set<TopicPartition> topicPartitions)

      Seek to the last offset for each of the given partitions.

      Due to internal buffering of messages, the will continue to observe messages fetched with respect to the old offset until some time after the given `completionHandler` is called. In contrast, the once the given `completionHandler` is called the `batchHandler(io.vertx.core.Handler<io.vertx.reactivex.kafka.client.consumer.KafkaConsumerRecords<K, V>>)` will only see messages consistent with the new offset.

      Parameters:
        `topicPartitions` - topic partition for which seek
      Returns:
        current KafkaConsumer instance

    - #### commit

          public void commit()

      Commit current offsets for all the subscribed list of topics and partition.

    - #### commit

          public void commit(Handler<AsyncResult<Void>> completionHandler)

      Commit current offsets for all the subscribed list of topics and partition.
      Parameters:
        `completionHandler` - handler called on operation completed

    - #### rxCommit

          public Completable rxCommit()

      Commit current offsets for all the subscribed list of topics and partition.
      Returns:

    - #### committed

          public void committed(TopicPartition topicPartition,
                                Handler<AsyncResult<OffsetAndMetadata>> handler)

      Get the last committed offset for the given partition (whether the commit happened by this process or another).
      Parameters:
        `topicPartition` - topic partition for getting last committed offset
        `handler` - handler called on operation completed

    - #### rxCommitted

          public Single<OffsetAndMetadata> rxCommitted(TopicPartition topicPartition)

      Get the last committed offset for the given partition (whether the commit happened by this process or another).
      Parameters:
        `topicPartition` - topic partition for getting last committed offset
      Returns:

    - #### partitionsFor

          public KafkaConsumer<K,V> partitionsFor(String topic,
                                                  Handler<AsyncResult<List<PartitionInfo>>> handler)

      Get metadata about the partitions for a given topic.
      Parameters:
        `topic` - topic partition for which getting partitions info
        `handler` - handler called on operation completed
      Returns:
        current KafkaConsumer instance

    - #### rxPartitionsFor

          public Single<List<PartitionInfo>> rxPartitionsFor(String topic)

      Get metadata about the partitions for a given topic.
      Parameters:
        `topic` - topic partition for which getting partitions info
      Returns:
        current KafkaConsumer instance

    - #### batchHandler

          public KafkaConsumer<K,V> batchHandler(Handler<KafkaConsumerRecords<K,V>> handler)

      Set the handler to be used when batches of messages are fetched from the Kafka server. Batch handlers need to take care not to block the event loop when dealing with large batches. It is better to process records individually using the `#handler(Handler) record handler`.
      Parameters:
        `handler` - handler called when batches of messages are fetched
      Returns:
        current KafkaConsumer instance

    - #### close

          public void close()

      Close the consumer

    - #### close

          public void close(Handler<AsyncResult<Void>> completionHandler)

      Close the consumer
      Parameters:
        `completionHandler` - handler called on operation completed

    - #### rxClose

          public Completable rxClose()

      Close the consumer
      Returns:

    - #### position

          public void position(TopicPartition partition,
                               Handler<AsyncResult<Long>> handler)

      Get the offset of the next record that will be fetched (if a record with that offset exists).
      Parameters:
        `partition` - The partition to get the position for
        `handler` - handler called on operation completed

    - #### rxPosition

          public Single<Long> rxPosition(TopicPartition partition)

      Get the offset of the next record that will be fetched (if a record with that offset exists).
      Parameters:
        `partition` - The partition to get the position for
      Returns:

    - #### offsetsForTimes

          public void offsetsForTimes(TopicPartition topicPartition,
                                      Long timestamp,
                                      Handler<AsyncResult<OffsetAndTimestamp>> handler)

      Look up the offset for the given partition by timestamp. Note: the result might be null in case for the given timestamp no offset can be found -- e.g., when the timestamp refers to the future
      Parameters:
        `topicPartition` - TopicPartition to query.
        `timestamp` - Timestamp to be used in the query.
        `handler` - handler called on operation completed

    - #### rxOffsetsForTimes

          public Single<OffsetAndTimestamp> rxOffsetsForTimes(TopicPartition topicPartition,
                                                              Long timestamp)

      Look up the offset for the given partition by timestamp. Note: the result might be null in case for the given timestamp no offset can be found -- e.g., when the timestamp refers to the future
      Parameters:
        `topicPartition` - TopicPartition to query.
        `timestamp` - Timestamp to be used in the query.
      Returns:

    - #### beginningOffsets

          public void beginningOffsets(TopicPartition topicPartition,
                                       Handler<AsyncResult<Long>> handler)

      Get the first offset for the given partitions.
      Parameters:
        `topicPartition` - the partition to get the earliest offset.
        `handler` - handler called on operation completed. Returns the earliest available offset for the given partition

    - #### rxBeginningOffsets

          public Single<Long> rxBeginningOffsets(TopicPartition topicPartition)

      Get the first offset for the given partitions.
      Parameters:
        `topicPartition` - the partition to get the earliest offset.
      Returns:

    - #### endOffsets

          public void endOffsets(TopicPartition topicPartition,
                                 Handler<AsyncResult<Long>> handler)

      Get the last offset for the given partition. The last offset of a partition is the offset of the upcoming message, i.e. the offset of the last available message + 1.
      Parameters:
        `topicPartition` - the partition to get the end offset.
        `handler` - handler called on operation completed. The end offset for the given partition.

    - #### rxEndOffsets

          public Single<Long> rxEndOffsets(TopicPartition topicPartition)

      Get the last offset for the given partition. The last offset of a partition is the offset of the upcoming message, i.e. the offset of the last available message + 1.
      Parameters:
        `topicPartition` - the partition to get the end offset.
      Returns:

    - #### pollTimeout

          public KafkaConsumer<K,V> pollTimeout(long timeout)

      Sets the poll timeout (in ms) for the underlying native Kafka Consumer. Defaults to 1000. Setting timeout to a lower value results in a more 'responsive' client, because it will block for a shorter period if no data is available in the assigned partition and therefore allows subsequent actions to be executed with a shorter delay. At the same time, the client will poll more frequently and thus will potentially create a higher load on the Kafka Broker.
      Parameters:
        `timeout` - The time, in milliseconds, spent waiting in poll if data is not available in the buffer. If 0, returns immediately with any records that are available currently in the native Kafka consumer's buffer, else returns empty. Must not be negative.
      Returns:

    - #### poll

          public void poll(long timeout,
                           Handler<AsyncResult<KafkaConsumerRecords<K,V>>> handler)

      Executes a poll for getting messages from Kafka
      Parameters:
        `timeout` - The time, in milliseconds, spent waiting in poll if data is not available in the buffer. If 0, returns immediately with any records that are available currently in the native Kafka consumer's buffer, else returns empty. Must not be negative.
        `handler` - handler called after the poll with batch of records (can be empty).

    - #### rxPoll

          public Single<KafkaConsumerRecords<K,V>> rxPoll(long timeout)

      Executes a poll for getting messages from Kafka
      Parameters:
        `timeout` - The time, in milliseconds, spent waiting in poll if data is not available in the buffer. If 0, returns immediately with any records that are available currently in the native Kafka consumer's buffer, else returns empty. Must not be negative.
      Returns:

    - #### newInstance

          public static <K,V> KafkaConsumer<K,V> newInstance(KafkaConsumer arg)

    - #### newInstance

          public static <K,V> KafkaConsumer<K,V> newInstance(KafkaConsumer arg,
                                                             <any> __typeArg_K,
                                                             <any> __typeArg_V)

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