org.apache.kafka.streams.processor.internals.SinkNode Maven / Gradle / Ivy
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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.processor.internals;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.streams.processor.StreamPartitioner;
import org.apache.kafka.streams.processor.TopicNameExtractor;
import org.apache.kafka.streams.processor.api.Record;
import static org.apache.kafka.streams.kstream.internals.WrappingNullableUtils.prepareKeySerializer;
import static org.apache.kafka.streams.kstream.internals.WrappingNullableUtils.prepareValueSerializer;
public class SinkNode extends ProcessorNode {
private Serializer keySerializer;
private Serializer valSerializer;
private final TopicNameExtractor topicExtractor;
private final StreamPartitioner partitioner;
private InternalProcessorContext context;
SinkNode(final String name,
final TopicNameExtractor topicExtractor,
final Serializer keySerializer,
final Serializer valSerializer,
final StreamPartitioner partitioner) {
super(name);
this.topicExtractor = topicExtractor;
this.keySerializer = keySerializer;
this.valSerializer = valSerializer;
this.partitioner = partitioner;
}
/**
* @throws UnsupportedOperationException if this method adds a child to a sink node
*/
@Override
public void addChild(final ProcessorNode child) {
throw new UnsupportedOperationException("sink node does not allow addChild");
}
@Override
public void init(final InternalProcessorContext context) {
super.init(context);
this.context = context;
keySerializer = prepareKeySerializer(keySerializer, context, this.name());
valSerializer = prepareValueSerializer(valSerializer, context, this.name());
}
@Override
public void process(final Record record) {
final RecordCollector collector = ((RecordCollector.Supplier) context).recordCollector();
final KIn key = record.key();
final VIn value = record.value();
final long timestamp = record.timestamp();
final ProcessorRecordContext contextForExtraction =
new ProcessorRecordContext(
timestamp,
context.offset(),
context.partition(),
context.topic(),
record.headers()
);
final String topic = topicExtractor.extract(key, value, contextForExtraction);
collector.send(
topic,
key,
value,
record.headers(),
timestamp,
keySerializer,
valSerializer,
name(),
context,
partitioner);
}
/**
* @return a string representation of this node, useful for debugging.
*/
@Override
public String toString() {
return toString("");
}
/**
* @return a string representation of this node starting with the given indent, useful for debugging.
*/
@Override
public String toString(final String indent) {
final StringBuilder sb = new StringBuilder(super.toString(indent));
sb.append(indent).append("\ttopic:\t\t");
sb.append(topicExtractor);
sb.append("\n");
return sb.toString();
}
}