org.wikimedia.eventutilities.flink.stream

Class EventDataStreamFactory

java.lang.Object

org.wikimedia.eventutilities.flink.stream.EventDataStreamFactory

public class EventDataStreamFactory
extends Object

Wraps EventStreamFactory with Flink DataStream API to provide helper methods to instantiate DataStream of Row using EventStream JSONSchemas and other metadata. Examples: Instantiate a EventDataStreamFactory from URIs:

     EventDataStreamFactory factory = EventDataStreamFactory.from(
          Arrays.asList(
              "https://schema.wikimedia.org/repositories/primary/jsonschema",
              "https://schema.wikimedia.org/repositories/secondary/jsonschema",
          ),
          "https://meta.wikimedia.org/w/api.php"
     );
 

Get a KafkaSource for a declared event stream:

     KafkaSource<Row> eventStreamSource = factory.kafkaSourceBuilder(
          "test.event.example",  // EventStream name
          "localhost:9092",
          "my_consumer_group"
     ).build();
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	EventDataStreamFactory.Builder

Constructor Summary

Constructors

Constructor and Description
EventDataStreamFactory(EventStreamFactory eventStreamFactory, JsonEventGenerator eventGenerator) Deprecated. use builder()

Method Summary

Modifier and Type	Method and Description
static EventDataStreamFactory.Builder	builder()
JsonRowDeserializationSchema	deserializer(String streamName) Gets a JSON to Row DeserializationSchema by streamName and its latest schema version.
JsonRowDeserializationSchema	deserializer(String streamName, String version) Gets a JSON to Row DeserializationSchema by streamName.
org.apache.flink.streaming.api.datastream.DataStreamSource<org.apache.flink.types.Row>	fileDataStream(String streamName, org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env, org.apache.flink.api.common.eventtime.WatermarkStrategy<org.apache.flink.types.Row> watermarkStrategy, URI... files) Gets a DataStreamSource of Row for streamName that reads JSON events from files using the latest schema version to deserialize.
org.apache.flink.streaming.api.datastream.DataStreamSource<org.apache.flink.types.Row>	fileDataStream(String streamName, String schemaVersion, org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env, org.apache.flink.api.common.eventtime.WatermarkStrategy<org.apache.flink.types.Row> watermarkStrategy, URI... files) Gets a DataStreamSource of Row for streamName that reads JSON events from files.
org.apache.flink.connector.file.sink.FileSink.DefaultRowFormatBuilder<org.apache.flink.types.Row>	fileSinkBuilderRowFormat(String streamName, String schemaVersion, org.apache.flink.core.fs.Path path) A FileSink FileSink.RowFormatBuilder used to output serialize event Rows to JSON.
org.apache.flink.connector.file.sink.FileSink.DefaultRowFormatBuilder<org.apache.flink.types.Row>	fileSinkBuilderRowFormat(String streamName, String schemaVersion, String path) Shortcut helper for calling fileSinkBuilderRowFormat using a String path.
FileSinkJsonRowEncoder	fileSinkEncoder(String streamName, String schemaVersion) A Row to JSON string Encoder for use with FileSinks.
org.apache.flink.connector.file.src.FileSource.FileSourceBuilder<org.apache.flink.types.Row>	fileStreamSourceBuilder(String streamName, org.apache.flink.core.fs.Path... paths) Gets a FileSource.FileSourceBuilder that will generate Rows of events in JSON files.
org.apache.flink.connector.file.src.FileSource.FileSourceBuilder<org.apache.flink.types.Row>	fileStreamSourceBuilder(String streamName, String schemaVersion, org.apache.flink.core.fs.Path... paths) Gets a FileSource.FileSourceBuilder that will generate Rows of events in JSON files.
static EventDataStreamFactory	from(List<String> eventSchemaBaseUris, String eventStreamConfigUri) EventDataStreamFactory factory method.
static EventDataStreamFactory	from(List<String> eventSchemaBaseUris, String eventStreamConfigUri, Map<String,String> httpClientRoutes) EventDataStreamFactory factory method.
EventStreamFactory	getEventStreamFactory() Convenience method to get the EventStreamFactory used by this EventDataStreamFactory.
org.apache.flink.connector.kafka.sink.KafkaSinkBuilder<org.apache.flink.types.Row>	kafkaSinkBuilder(String streamName, String schemaVersion, String bootstrapServers, String topic, KafkaRecordTimestampStrategy timestampStrategy) Prepare a KafkaSinkBuilder with all the required components to produce to kafka using a json format matching the provided schema.
org.apache.flink.connector.kafka.sink.KafkaSinkBuilder<org.apache.flink.types.Row>	kafkaSinkBuilder(String streamName, String schemaVersion, String bootstrapServers, String topic, KafkaRecordTimestampStrategy timestampStrategy, org.apache.flink.connector.kafka.sink.KafkaPartitioner<org.apache.flink.types.Row> partitioner) Prepare a KafkaSinkBuilder with all the required components to produce to kafka using a json format matching the provided schema.
org.apache.flink.connector.kafka.source.KafkaSourceBuilder<org.apache.flink.types.Row>	kafkaSourceBuilder(String streamName, String bootstrapServers, String consumerGroup) Get a KafkaSourceBuilder that is primed with settings needed to consume the streamName from Kafka from the stream's configured topics that matching the topic filter or topic prefix using the latest schema version.
org.apache.flink.connector.kafka.source.KafkaSourceBuilder<org.apache.flink.types.Row>	kafkaSourceBuilder(String streamName, String bootstrapServers, String consumerGroup, List<String> topics) Get a KafkaSourceBuilder that is primed with settings needed to consume the streamName from Kafka using the latest schema version.
org.apache.flink.connector.kafka.source.KafkaSourceBuilder<org.apache.flink.types.Row>	kafkaSourceBuilder(String streamName, String schemaVersion, String bootstrapServers, String consumerGroup, List<String> topics) Get a KafkaSourceBuilder that is primed with settings needed to consume the streamName from Kafka.
EventRowTypeInfo	rowTypeInfo(String streamName) Gets the EventRowTypeInfo (which is a TypeInformation of Row) for the streamName.
EventRowTypeInfo	rowTypeInfo(String streamName, String version) Gets the EventRowTypeInfo (which is a TypeInformation of Row) for the streamName and a particular schema version.
JsonRowSerializationSchema	serializer(String streamName, String version) Create a SerializationSchema suited for producing json to the stream identified by streamName using the provided schema version.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EventDataStreamFactory

@Deprecated
public EventDataStreamFactory(EventStreamFactory eventStreamFactory,
                                          JsonEventGenerator eventGenerator)

Deprecated. use builder()

Method Detail

builder

public static EventDataStreamFactory.Builder builder()

from

public static EventDataStreamFactory from(@Nonnull
                                          List<String> eventSchemaBaseUris,
                                          @Nonnull
                                          String eventStreamConfigUri)

EventDataStreamFactory factory method.

Parameters:

eventSchemaBaseUris - URIs from which to fetch event JSONSchemas.

eventStreamConfigUri - URI from which to fetch event stream config.

from

public static EventDataStreamFactory from(@Nonnull
                                          List<String> eventSchemaBaseUris,
                                          @Nonnull
                                          String eventStreamConfigUri,
                                          Map<String,String> httpClientRoutes)

EventDataStreamFactory factory method.

Parameters:

eventSchemaBaseUris - URIs from which to fetch event JSONSchemas.

eventStreamConfigUri - URI from which to fetch event stream config.

httpClientRoutes - Map of source to dest http client routes. E.g. "https://meta.wikimedia.org" to "https://api-ro.wikimedia.org" If null, no special routing will be configured.

getEventStreamFactory

public EventStreamFactory getEventStreamFactory()

Convenience method to get the EventStreamFactory used by this EventDataStreamFactory.

rowTypeInfo

public EventRowTypeInfo rowTypeInfo(String streamName)

Gets the EventRowTypeInfo (which is a TypeInformation of Row) for the streamName. The corresponding schema is the latest obtained from the EventStream configuration identified by streamName.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

rowTypeInfo

public EventRowTypeInfo rowTypeInfo(String streamName,
                                    String version)

Gets the EventRowTypeInfo (which is a TypeInformation of Row) for the streamName and a particular schema version.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

version - Version of the schema to use

deserializer

public JsonRowDeserializationSchema deserializer(String streamName)

Gets a JSON to Row DeserializationSchema by streamName and its latest schema version.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

deserializer

public JsonRowDeserializationSchema deserializer(String streamName,
                                                 @Nullable
                                                 String version)

Gets a JSON to Row DeserializationSchema by streamName.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

version - Version of the schema to use. If null, the latest version will be used.

serializer

public JsonRowSerializationSchema serializer(String streamName,
                                             String version)

Create a SerializationSchema suited for producing json to the stream identified by streamName using the provided schema version.

kafkaSourceBuilder

public org.apache.flink.connector.kafka.source.KafkaSourceBuilder<org.apache.flink.types.Row> kafkaSourceBuilder(String streamName,
                                                                                                                 @Nullable
                                                                                                                 String schemaVersion,
                                                                                                                 String bootstrapServers,
                                                                                                                 String consumerGroup,
                                                                                                                 @Nullable
                                                                                                                 List<String> topics)

Get a KafkaSourceBuilder that is primed with settings needed to consume the streamName from Kafka. This sets the following: - bootstrapServers, - topics - consumer group id - value only deserializer that will deserialize to a Row conforming to streamName's JSONSchema at schemaVersion. - starting offsets will use committed offsets, resetting to LATEST if no offsets are committed. If you want to change any of these settings, then call the appropriate method on the returned KafkaSourceBuilder before calling build(). Note that Flink's KafkaSourceBuilder does not allow you to call setTopics() more than once, so if you need to override the topics used, be sure to provide them here as the topics parameter. Example:

     EventDataStreamFactory eventDataStreamFactory = EventDataStreamFactory.from(...)
     KafkaSource<Row> eventStreamSource = eventDataStreamFactory.kafkaSourceBuilder(
          "test.event.example",  // EventStream name
          "1.1.0",
          "localhost:9092",
          "my_consumer_group",
          Arrays.asList("topic1", "topic2")
     ).build();
 

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

schemaVersion - Version of the schema to use. If null, the latest schema version will be used.

bootstrapServers - Kafka bootstrap.servers property.

consumerGroup - Kafka consumer.group.id property.

topics - Optional List of Kafka topcis to subscribe to. If null, the topics from EventStreamConfig matching the topic filter or topic prefix for streamName will be used.

See Also:

EventDataStreamFactory.Builder.topicPrefix(String), Builder#topicFilter(Predicate)

kafkaSourceBuilder

public org.apache.flink.connector.kafka.source.KafkaSourceBuilder<org.apache.flink.types.Row> kafkaSourceBuilder(String streamName,
                                                                                                                 String bootstrapServers,
                                                                                                                 String consumerGroup,
                                                                                                                 @Nullable
                                                                                                                 List<String> topics)

Get a KafkaSourceBuilder that is primed with settings needed to consume the streamName from Kafka using the latest schema version.

See Also:

kafkaSourceBuilder(String, String, String, String, List)

kafkaSourceBuilder

public org.apache.flink.connector.kafka.source.KafkaSourceBuilder<org.apache.flink.types.Row> kafkaSourceBuilder(String streamName,
                                                                                                                 String bootstrapServers,
                                                                                                                 String consumerGroup)

Get a KafkaSourceBuilder that is primed with settings needed to consume the streamName from Kafka from the stream's configured topics that matching the topic filter or topic prefix using the latest schema version.

See Also:

kafkaSourceBuilder(String, String, String, String, List)

kafkaSinkBuilder

public org.apache.flink.connector.kafka.sink.KafkaSinkBuilder<org.apache.flink.types.Row> kafkaSinkBuilder(String streamName,
                                                                                                           @Nullable
                                                                                                           String schemaVersion,
                                                                                                           String bootstrapServers,
                                                                                                           String topic,
                                                                                                           KafkaRecordTimestampStrategy timestampStrategy)

Prepare a KafkaSinkBuilder with all the required components to produce to kafka using a json format matching the provided schema. Produces events to the default kafka partition.

See Also:

kafkaSinkBuilder(String, String, String, String, KafkaRecordTimestampStrategy, KafkaPartitioner)

kafkaSinkBuilder

public org.apache.flink.connector.kafka.sink.KafkaSinkBuilder<org.apache.flink.types.Row> kafkaSinkBuilder(String streamName,
                                                                                                           @Nullable
                                                                                                           String schemaVersion,
                                                                                                           String bootstrapServers,
                                                                                                           String topic,
                                                                                                           KafkaRecordTimestampStrategy timestampStrategy,
                                                                                                           @Nullable
                                                                                                           org.apache.flink.connector.kafka.sink.KafkaPartitioner<org.apache.flink.types.Row> partitioner)

Prepare a KafkaSinkBuilder with all the required components to produce to kafka using a json format matching the provided schema. The instantiated KafkaSink will produce snappy compressed records. The produced messages match the WMF Event Platform Rules: - the meta.dt field is filled and will be used as the kafka timestamp - the topic to produce to is one of the topics defined in the EventStream configuration - the provided schema must match the one defined in the EventStream configuration - the resulting json is validated against this schema - the dt (event time) field remains optional and must be set beforehand in the pipeline

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

schemaVersion - Version of the schema to use.

bootstrapServers - Kafka bootstrap.servers property.

topic - The Kafka topic to write to. If not one of the topics referenced by the EventStreamConfig, a warning will be logged.

timestampStrategy - The strategy to use regarding producer records timestamps and event time.

partitioner - An optional partioner

See Also:

KafkaRecordTimestampStrategy

fileStreamSourceBuilder

public org.apache.flink.connector.file.src.FileSource.FileSourceBuilder<org.apache.flink.types.Row> fileStreamSourceBuilder(String streamName,
                                                                                                                            @Nullable
                                                                                                                            String schemaVersion,
                                                                                                                            org.apache.flink.core.fs.Path... paths)

Gets a FileSource.FileSourceBuilder that will generate Rows of events in JSON files. The Rows will be deserialized using the JSONSchema of streamName. This is a slightly lower level method than fileDataStream(String, StreamExecutionEnvironment, WatermarkStrategy, URI...) You'll probably want to use fileDataStream, especially if you are just using this FileSource for testing purposes.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

schemaVersion - Version of the schema to use. If null, latest version will be used.

paths - Flink Paths from which to read JSON events.

fileStreamSourceBuilder

public org.apache.flink.connector.file.src.FileSource.FileSourceBuilder<org.apache.flink.types.Row> fileStreamSourceBuilder(String streamName,
                                                                                                                            org.apache.flink.core.fs.Path... paths)

Gets a FileSource.FileSourceBuilder that will generate Rows of events in JSON files.

See Also:

fileStreamSourceBuilder(String, String, Path...)

fileDataStream

public org.apache.flink.streaming.api.datastream.DataStreamSource<org.apache.flink.types.Row> fileDataStream(String streamName,
                                                                                                             @Nullable
                                                                                                             String schemaVersion,
                                                                                                             org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env,
                                                                                                             org.apache.flink.api.common.eventtime.WatermarkStrategy<org.apache.flink.types.Row> watermarkStrategy,
                                                                                                             URI... files)

Gets a DataStreamSource of Row for streamName that reads JSON events from files. Example:

     EventDataStreamFactory eventDataStreamFactory = EventDataStreamFactory.from(...)
     DataStreamSource<Row> eventFileSource = eventDataStreamFactory.dataStreamFromFiles(
          "test.event.example",       // EventStream name
          env,                        // Flink StreamExecutionEnvironment
          WatermarkStrategy.noWatermarks(),
          new URI("file:///path/to/test.events.json"
     );
 

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

schemaVersion - Version of the schema to use. If null, latest version will be used.

env - StreamExecutionEnvironment in which to call fromSource.

watermarkStrategy - For simple testing input from files, you'll likely want to use WatermarkStrategy.noWatermarks();

files - URIs to files of JSON events that conform to the JSONSchema of streamName. These will be converted to Flink Paths.

fileDataStream

public org.apache.flink.streaming.api.datastream.DataStreamSource<org.apache.flink.types.Row> fileDataStream(String streamName,
                                                                                                             org.apache.flink.streaming.api.environment.StreamExecutionEnvironment env,
                                                                                                             org.apache.flink.api.common.eventtime.WatermarkStrategy<org.apache.flink.types.Row> watermarkStrategy,
                                                                                                             URI... files)

Gets a DataStreamSource of Row for streamName that reads JSON events from files using the latest schema version to deserialize.

See Also:

fileDataStream(String, String, StreamExecutionEnvironment, WatermarkStrategy, URI...)

fileSinkEncoder

public FileSinkJsonRowEncoder fileSinkEncoder(String streamName,
                                              String schemaVersion)

A Row to JSON string Encoder for use with FileSinks.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

schemaVersion - Version of the schema to use when encoding.

fileSinkBuilderRowFormat

public org.apache.flink.connector.file.sink.FileSink.DefaultRowFormatBuilder<org.apache.flink.types.Row> fileSinkBuilderRowFormat(String streamName,
                                                                                                                                  String schemaVersion,
                                                                                                                                  String path)

Shortcut helper for calling fileSinkBuilderRowFormat using a String path.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

schemaVersion - Version of the schema to use when encoding.

path - Base directory path location in which to write partitioned directories and files. Must begin with a Flink supported file protocol, e.g. file://, hdfs:// etc.

fileSinkBuilderRowFormat

public org.apache.flink.connector.file.sink.FileSink.DefaultRowFormatBuilder<org.apache.flink.types.Row> fileSinkBuilderRowFormat(String streamName,
                                                                                                                                  String schemaVersion,
                                                                                                                                  org.apache.flink.core.fs.Path path)

A FileSink FileSink.RowFormatBuilder used to output serialize event Rows to JSON. If desired, customize the returned Builder with custom bucket assigners and rolling policies, and then call .build() to get a FileSink.

Parameters:

streamName - Name of the EventStream, must be declared in EventStreamConfig.

schemaVersion - Version of the schema to use when encoding.

path - Base directory path location in which to write partitioned directories and files.