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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.streams;
import org.apache.kafka.common.serialization.Deserializer;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.streams.errors.TopologyException;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.kstream.KTable;
import org.apache.kafka.streams.processor.ConnectedStoreProvider;
import org.apache.kafka.streams.processor.Processor;
import org.apache.kafka.streams.processor.ProcessorSupplier;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.processor.StreamPartitioner;
import org.apache.kafka.streams.processor.TimestampExtractor;
import org.apache.kafka.streams.processor.TopicNameExtractor;
import org.apache.kafka.streams.processor.internals.InternalTopologyBuilder;
import org.apache.kafka.streams.processor.internals.ProcessorNode;
import org.apache.kafka.streams.processor.internals.ProcessorTopology;
import org.apache.kafka.streams.processor.internals.SinkNode;
import org.apache.kafka.streams.processor.internals.SourceNode;
import org.apache.kafka.streams.state.StoreBuilder;
import java.util.Set;
import java.util.regex.Pattern;
/**
* A logical representation of a {@link ProcessorTopology}.
* A topology is an acyclic graph of sources, processors, and sinks.
* A {@link SourceNode source} is a node in the graph that consumes one or more Kafka topics and forwards them to its
* successor nodes.
* A {@link Processor processor} is a node in the graph that receives input records from upstream nodes, processes the
* records, and optionally forwarding new records to one or all of its downstream nodes.
* Finally, a {@link SinkNode sink} is a node in the graph that receives records from upstream nodes and writes them to
* a Kafka topic.
* A {@code Topology} allows you to construct an acyclic graph of these nodes, and then passed into a new
* {@link KafkaStreams} instance that will then {@link KafkaStreams#start() begin consuming, processing, and producing
* records}.
*/
public class Topology {
final InternalTopologyBuilder internalTopologyBuilder = new InternalTopologyBuilder();
/**
* Sets the {@code auto.offset.reset} configuration when
* {@link #addSource(AutoOffsetReset, String, String...) adding a source processor} or when creating {@link KStream}
* or {@link KTable} via {@link StreamsBuilder}.
*/
public enum AutoOffsetReset {
EARLIEST, LATEST
}
/**
* Add a new source that consumes the named topics and forward the records to child processor and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
* The default {@link TimestampExtractor} as specified in the {@link StreamsConfig config} is used.
*
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topics the name of one or more Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final String name,
final String... topics) {
internalTopologyBuilder.addSource(null, name, null, null, null, topics);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern
* and forward the records to child processor and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
* The default {@link TimestampExtractor} as specified in the {@link StreamsConfig config} is used.
*
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topicPattern regular expression pattern to match Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final String name,
final Pattern topicPattern) {
internalTopologyBuilder.addSource(null, name, null, null, null, topicPattern);
return this;
}
/**
* Add a new source that consumes the named topics and forward the records to child processor and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
* The default {@link TimestampExtractor} as specified in the {@link StreamsConfig config} is used.
*
* @param offsetReset the auto offset reset policy to use for this source if no committed offsets found; acceptable values earliest or latest
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topics the name of one or more Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final String name,
final String... topics) {
internalTopologyBuilder.addSource(offsetReset, name, null, null, null, topics);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern
* and forward the records to child processor and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
* The default {@link TimestampExtractor} as specified in the {@link StreamsConfig config} is used.
*
* @param offsetReset the auto offset reset policy value for this source if no committed offsets found; acceptable values earliest or latest.
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topicPattern regular expression pattern to match Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final String name,
final Pattern topicPattern) {
internalTopologyBuilder.addSource(offsetReset, name, null, null, null, topicPattern);
return this;
}
/**
* Add a new source that consumes the named topics and forward the records to child processor and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* @param timestampExtractor the stateless timestamp extractor used for this source,
* if not specified the default extractor defined in the configs will be used
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topics the name of one or more Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final TimestampExtractor timestampExtractor,
final String name,
final String... topics) {
internalTopologyBuilder.addSource(null, name, timestampExtractor, null, null, topics);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern
* and forward the records to child processor and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* @param timestampExtractor the stateless timestamp extractor used for this source,
* if not specified the default extractor defined in the configs will be used
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topicPattern regular expression pattern to match Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final TimestampExtractor timestampExtractor,
final String name,
final Pattern topicPattern) {
internalTopologyBuilder.addSource(null, name, timestampExtractor, null, null, topicPattern);
return this;
}
/**
* Add a new source that consumes the named topics and forward the records to child processor and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* @param offsetReset the auto offset reset policy to use for this source if no committed offsets found;
* acceptable values earliest or latest
* @param timestampExtractor the stateless timestamp extractor used for this source,
* if not specified the default extractor defined in the configs will be used
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topics the name of one or more Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final TimestampExtractor timestampExtractor,
final String name,
final String... topics) {
internalTopologyBuilder.addSource(offsetReset, name, timestampExtractor, null, null, topics);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern and forward the records to child processor
* and/or sink nodes.
* The source will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key deserializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value deserializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* @param offsetReset the auto offset reset policy value for this source if no committed offsets found;
* acceptable values earliest or latest.
* @param timestampExtractor the stateless timestamp extractor used for this source,
* if not specified the default extractor defined in the configs will be used
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param topicPattern regular expression pattern to match Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final TimestampExtractor timestampExtractor,
final String name,
final Pattern topicPattern) {
internalTopologyBuilder.addSource(offsetReset, name, timestampExtractor, null, null, topicPattern);
return this;
}
/**
* Add a new source that consumes the named topics and forwards the records to child processor and/or sink nodes.
* The source will use the specified key and value deserializers.
* The default {@link TimestampExtractor} as specified in the {@link StreamsConfig config} is used.
*
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}
* @param keyDeserializer key deserializer used to read this source, if not specified the default
* key deserializer defined in the configs will be used
* @param valueDeserializer value deserializer used to read this source,
* if not specified the default value deserializer defined in the configs will be used
* @param topics the name of one or more Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
public synchronized Topology addSource(final String name,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final String... topics) {
internalTopologyBuilder.addSource(null, name, null, keyDeserializer, valueDeserializer, topics);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern and forwards the records to child processor
* and/or sink nodes.
* The source will use the specified key and value deserializers.
* The provided de-/serializers will be used for all matched topics, so care should be taken to specify patterns for
* topics that share the same key-value data format.
* The default {@link TimestampExtractor} as specified in the {@link StreamsConfig config} is used.
*
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}
* @param keyDeserializer key deserializer used to read this source, if not specified the default
* key deserializer defined in the configs will be used
* @param valueDeserializer value deserializer used to read this source,
* if not specified the default value deserializer defined in the configs will be used
* @param topicPattern regular expression pattern to match Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by name
*/
public synchronized Topology addSource(final String name,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final Pattern topicPattern) {
internalTopologyBuilder.addSource(null, name, null, keyDeserializer, valueDeserializer, topicPattern);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern and forwards the records to child processor
* and/or sink nodes.
* The source will use the specified key and value deserializers.
* The provided de-/serializers will be used for all the specified topics, so care should be taken when specifying
* topics that share the same key-value data format.
*
* @param offsetReset the auto offset reset policy to use for this stream if no committed offsets found;
* acceptable values are earliest or latest
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}
* @param keyDeserializer key deserializer used to read this source, if not specified the default
* key deserializer defined in the configs will be used
* @param valueDeserializer value deserializer used to read this source,
* if not specified the default value deserializer defined in the configs will be used
* @param topics the name of one or more Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by name
*/
@SuppressWarnings("overloads")
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final String name,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final String... topics) {
internalTopologyBuilder.addSource(offsetReset, name, null, keyDeserializer, valueDeserializer, topics);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern and forwards the records to child processor
* and/or sink nodes.
* The source will use the specified key and value deserializers.
* The provided de-/serializers will be used for all matched topics, so care should be taken to specify patterns for
* topics that share the same key-value data format.
*
* @param offsetReset the auto offset reset policy to use for this stream if no committed offsets found;
* acceptable values are earliest or latest
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}
* @param keyDeserializer key deserializer used to read this source, if not specified the default
* key deserializer defined in the configs will be used
* @param valueDeserializer value deserializer used to read this source,
* if not specified the default value deserializer defined in the configs will be used
* @param topicPattern regular expression pattern to match Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by name
*/
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final String name,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final Pattern topicPattern) {
internalTopologyBuilder.addSource(offsetReset, name, null, keyDeserializer, valueDeserializer, topicPattern);
return this;
}
/**
* Add a new source that consumes the named topics and forwards the records to child processor and/or sink nodes.
* The source will use the specified key and value deserializers.
*
* @param offsetReset the auto offset reset policy to use for this stream if no committed offsets found;
* acceptable values are earliest or latest.
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param timestampExtractor the stateless timestamp extractor used for this source,
* if not specified the default extractor defined in the configs will be used
* @param keyDeserializer key deserializer used to read this source, if not specified the default
* key deserializer defined in the configs will be used
* @param valueDeserializer value deserializer used to read this source,
* if not specified the default value deserializer defined in the configs will be used
* @param topics the name of one or more Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by another source
*/
@SuppressWarnings("overloads")
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final String name,
final TimestampExtractor timestampExtractor,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final String... topics) {
internalTopologyBuilder.addSource(offsetReset, name, timestampExtractor, keyDeserializer, valueDeserializer, topics);
return this;
}
/**
* Add a new source that consumes from topics matching the given pattern and forwards the records to child processor
* and/or sink nodes.
* The source will use the specified key and value deserializers.
* The provided de-/serializers will be used for all matched topics, so care should be taken to specify patterns for
* topics that share the same key-value data format.
*
* @param offsetReset the auto offset reset policy to use for this stream if no committed offsets found;
* acceptable values are earliest or latest
* @param name the unique name of the source used to reference this node when
* {@link #addProcessor(String, ProcessorSupplier, String...) adding processor children}.
* @param timestampExtractor the stateless timestamp extractor used for this source,
* if not specified the default extractor defined in the configs will be used
* @param keyDeserializer key deserializer used to read this source, if not specified the default
* key deserializer defined in the configs will be used
* @param valueDeserializer value deserializer used to read this source,
* if not specified the default value deserializer defined in the configs will be used
* @param topicPattern regular expression pattern to match Kafka topics that this source is to consume
* @return itself
* @throws TopologyException if processor is already added or if topics have already been registered by name
*/
@SuppressWarnings("overloads")
public synchronized Topology addSource(final AutoOffsetReset offsetReset,
final String name,
final TimestampExtractor timestampExtractor,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final Pattern topicPattern) {
internalTopologyBuilder.addSource(offsetReset, name, timestampExtractor, keyDeserializer, valueDeserializer, topicPattern);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to the named Kafka topic.
* The sink will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* @param name the unique name of the sink
* @param topic the name of the Kafka topic to which this sink should write its records
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and write to its topic
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, StreamPartitioner, String...)
* @see #addSink(String, String, Serializer, Serializer, String...)
* @see #addSink(String, String, Serializer, Serializer, StreamPartitioner, String...)
*/
public synchronized Topology addSink(final String name,
final String topic,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topic, null, null, null, parentNames);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to the named Kafka topic,
* using the supplied partitioner.
* The sink will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* The sink will also use the specified {@link StreamPartitioner} to determine how records are distributed among
* the named Kafka topic's partitions.
* Such control is often useful with topologies that use {@link #addStateStore(StoreBuilder, String...) state
* stores} in its processors.
* In most other cases, however, a partitioner needs not be specified and Kafka will automatically distribute
* records among partitions using Kafka's default partitioning logic.
*
* @param name the unique name of the sink
* @param topic the name of the Kafka topic to which this sink should write its records
* @param partitioner the function that should be used to determine the partition for each record processed by the sink
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and write to its topic
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, String...)
* @see #addSink(String, String, Serializer, Serializer, String...)
* @see #addSink(String, String, Serializer, Serializer, StreamPartitioner, String...)
*/
public synchronized Topology addSink(final String name,
final String topic,
final StreamPartitioner partitioner,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topic, null, null, partitioner, parentNames);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to the named Kafka topic.
* The sink will use the specified key and value serializers.
*
* @param name the unique name of the sink
* @param topic the name of the Kafka topic to which this sink should write its records
* @param keySerializer the {@link Serializer key serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param valueSerializer the {@link Serializer value serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and write to its topic
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, String...)
* @see #addSink(String, String, StreamPartitioner, String...)
* @see #addSink(String, String, Serializer, Serializer, StreamPartitioner, String...)
*/
public synchronized Topology addSink(final String name,
final String topic,
final Serializer keySerializer,
final Serializer valueSerializer,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topic, keySerializer, valueSerializer, null, parentNames);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to the named Kafka topic.
* The sink will use the specified key and value serializers, and the supplied partitioner.
*
* @param name the unique name of the sink
* @param topic the name of the Kafka topic to which this sink should write its records
* @param keySerializer the {@link Serializer key serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param valueSerializer the {@link Serializer value serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param partitioner the function that should be used to determine the partition for each record processed by the sink
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and write to its topic
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, String...)
* @see #addSink(String, String, StreamPartitioner, String...)
* @see #addSink(String, String, Serializer, Serializer, String...)
*/
public synchronized Topology addSink(final String name,
final String topic,
final Serializer keySerializer,
final Serializer valueSerializer,
final StreamPartitioner partitioner,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topic, keySerializer, valueSerializer, partitioner, parentNames);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to Kafka topics based on {@code topicExtractor}.
* The topics that it may ever send to should be pre-created.
* The sink will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* @param name the unique name of the sink
* @param topicExtractor the extractor to determine the name of the Kafka topic to which this sink should write for each record
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and dynamically write to topics
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, StreamPartitioner, String...)
* @see #addSink(String, String, Serializer, Serializer, String...)
* @see #addSink(String, String, Serializer, Serializer, StreamPartitioner, String...)
*/
public synchronized Topology addSink(final String name,
final TopicNameExtractor topicExtractor,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topicExtractor, null, null, null, parentNames);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to Kafka topics based on {@code topicExtractor},
* using the supplied partitioner.
* The topics that it may ever send to should be pre-created.
* The sink will use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} and
* {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}.
*
* The sink will also use the specified {@link StreamPartitioner} to determine how records are distributed among
* the named Kafka topic's partitions.
* Such control is often useful with topologies that use {@link #addStateStore(StoreBuilder, String...) state
* stores} in its processors.
* In most other cases, however, a partitioner needs not be specified and Kafka will automatically distribute
* records among partitions using Kafka's default partitioning logic.
*
* @param name the unique name of the sink
* @param topicExtractor the extractor to determine the name of the Kafka topic to which this sink should write for each record
* @param partitioner the function that should be used to determine the partition for each record processed by the sink
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and dynamically write to topics
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, String...)
* @see #addSink(String, String, Serializer, Serializer, String...)
* @see #addSink(String, String, Serializer, Serializer, StreamPartitioner, String...)
*/
public synchronized Topology addSink(final String name,
final TopicNameExtractor topicExtractor,
final StreamPartitioner partitioner,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topicExtractor, null, null, partitioner, parentNames);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to Kafka topics based on {@code topicExtractor}.
* The topics that it may ever send to should be pre-created.
* The sink will use the specified key and value serializers.
*
* @param name the unique name of the sink
* @param topicExtractor the extractor to determine the name of the Kafka topic to which this sink should write for each record
* @param keySerializer the {@link Serializer key serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param valueSerializer the {@link Serializer value serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and dynamically write to topics
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, String...)
* @see #addSink(String, String, StreamPartitioner, String...)
* @see #addSink(String, String, Serializer, Serializer, StreamPartitioner, String...)
*/
public synchronized Topology addSink(final String name,
final TopicNameExtractor topicExtractor,
final Serializer keySerializer,
final Serializer valueSerializer,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topicExtractor, keySerializer, valueSerializer, null, parentNames);
return this;
}
/**
* Add a new sink that forwards records from upstream parent processor and/or source nodes to Kafka topics based on {@code topicExtractor}.
* The topics that it may ever send to should be pre-created.
* The sink will use the specified key and value serializers, and the supplied partitioner.
*
* @param name the unique name of the sink
* @param topicExtractor the extractor to determine the name of the Kafka topic to which this sink should write for each record
* @param keySerializer the {@link Serializer key serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_KEY_SERDE_CLASS_CONFIG default key serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param valueSerializer the {@link Serializer value serializer} used when consuming records; may be null if the sink
* should use the {@link StreamsConfig#DEFAULT_VALUE_SERDE_CLASS_CONFIG default value serializer} specified in the
* {@link StreamsConfig stream configuration}
* @param partitioner the function that should be used to determine the partition for each record processed by the sink
* @param parentNames the name of one or more source or processor nodes whose output records this sink should consume
* and dynamically write to topics
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
* @see #addSink(String, String, String...)
* @see #addSink(String, String, StreamPartitioner, String...)
* @see #addSink(String, String, Serializer, Serializer, String...)
*/
public synchronized Topology addSink(final String name,
final TopicNameExtractor topicExtractor,
final Serializer keySerializer,
final Serializer valueSerializer,
final StreamPartitioner partitioner,
final String... parentNames) {
internalTopologyBuilder.addSink(name, topicExtractor, keySerializer, valueSerializer, partitioner, parentNames);
return this;
}
/**
* Add a new processor node that receives and processes records output by one or more parent source or processor
* node.
* Any new record output by this processor will be forwarded to its child processor or sink nodes.
* If {@code supplier} provides stores via {@link ConnectedStoreProvider#stores()}, the provided {@link StoreBuilder}s
* will be added to the topology and connected to this processor automatically.
*
* @param name the unique name of the processor node
* @param supplier the supplier used to obtain this node's {@link Processor} instance
* @param parentNames the name of one or more source or processor nodes whose output records this processor should receive
* and process
* @return itself
* @throws TopologyException if parent processor is not added yet, or if this processor's name is equal to the parent's name
*/
@SuppressWarnings("rawtypes")
public synchronized Topology addProcessor(final String name,
final ProcessorSupplier supplier,
final String... parentNames) {
internalTopologyBuilder.addProcessor(name, supplier, parentNames);
final Set> stores = supplier.stores();
if (stores != null) {
for (final StoreBuilder storeBuilder : stores) {
internalTopologyBuilder.addStateStore(storeBuilder, name);
}
}
return this;
}
/**
* Adds a state store.
*
* @param storeBuilder the storeBuilder used to obtain this state store {@link StateStore} instance
* @param processorNames the names of the processors that should be able to access the provided store
* @return itself
* @throws TopologyException if state store supplier is already added
*/
public synchronized Topology addStateStore(final StoreBuilder storeBuilder,
final String... processorNames) {
internalTopologyBuilder.addStateStore(storeBuilder, processorNames);
return this;
}
/**
* Adds a global {@link StateStore} to the topology.
* The {@link StateStore} sources its data from all partitions of the provided input topic.
* There will be exactly one instance of this {@link StateStore} per Kafka Streams instance.
*
* A {@link SourceNode} with the provided sourceName will be added to consume the data arriving from the partitions
* of the input topic.
*
* The provided {@link ProcessorSupplier} will be used to create an {@link ProcessorNode} that will receive all
* records forwarded from the {@link SourceNode}.
* This {@link ProcessorNode} should be used to keep the {@link StateStore} up-to-date.
* The default {@link TimestampExtractor} as specified in the {@link StreamsConfig config} is used.
*
* @param storeBuilder user defined state store builder
* @param sourceName name of the {@link SourceNode} that will be automatically added
* @param keyDeserializer the {@link Deserializer} to deserialize keys with
* @param valueDeserializer the {@link Deserializer} to deserialize values with
* @param topic the topic to source the data from
* @param processorName the name of the {@link ProcessorSupplier}
* @param stateUpdateSupplier the instance of {@link ProcessorSupplier}
* @return itself
* @throws TopologyException if the processor of state is already registered
*/
public synchronized Topology addGlobalStore(final StoreBuilder storeBuilder,
final String sourceName,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final String topic,
final String processorName,
final ProcessorSupplier stateUpdateSupplier) {
internalTopologyBuilder.addGlobalStore(
storeBuilder,
sourceName,
null,
keyDeserializer,
valueDeserializer,
topic,
processorName,
stateUpdateSupplier
);
return this;
}
/**
* Adds a global {@link StateStore} to the topology.
* The {@link StateStore} sources its data from all partitions of the provided input topic.
* There will be exactly one instance of this {@link StateStore} per Kafka Streams instance.
*
* A {@link SourceNode} with the provided sourceName will be added to consume the data arriving from the partitions
* of the input topic.
*
* The provided {@link ProcessorSupplier} will be used to create an {@link ProcessorNode} that will receive all
* records forwarded from the {@link SourceNode}.
* This {@link ProcessorNode} should be used to keep the {@link StateStore} up-to-date.
*
* @param storeBuilder user defined key value store builder
* @param sourceName name of the {@link SourceNode} that will be automatically added
* @param timestampExtractor the stateless timestamp extractor used for this source,
* if not specified the default extractor defined in the configs will be used
* @param keyDeserializer the {@link Deserializer} to deserialize keys with
* @param valueDeserializer the {@link Deserializer} to deserialize values with
* @param topic the topic to source the data from
* @param processorName the name of the {@link ProcessorSupplier}
* @param stateUpdateSupplier the instance of {@link ProcessorSupplier}
* @return itself
* @throws TopologyException if the processor of state is already registered
*/
public synchronized Topology addGlobalStore(final StoreBuilder storeBuilder,
final String sourceName,
final TimestampExtractor timestampExtractor,
final Deserializer keyDeserializer,
final Deserializer valueDeserializer,
final String topic,
final String processorName,
final ProcessorSupplier stateUpdateSupplier) {
internalTopologyBuilder.addGlobalStore(
storeBuilder,
sourceName,
timestampExtractor,
keyDeserializer,
valueDeserializer,
topic,
processorName,
stateUpdateSupplier
);
return this;
}
/**
* Connects the processor and the state stores.
*
* @param processorName the name of the processor
* @param stateStoreNames the names of state stores that the processor uses
* @return itself
* @throws TopologyException if the processor or a state store is unknown
*/
public synchronized Topology connectProcessorAndStateStores(final String processorName,
final String... stateStoreNames) {
internalTopologyBuilder.connectProcessorAndStateStores(processorName, stateStoreNames);
return this;
}
/**
* Returns a description of the specified {@code Topology}.
*
* @return a description of the topology.
*/
public synchronized TopologyDescription describe() {
return internalTopologyBuilder.describe();
}
}