/
StreamSourceNode.java
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/
StreamSourceNode.java
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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.kstream.internals.graph;
import org.apache.kafka.streams.Topology.AutoOffsetReset;
import org.apache.kafka.streams.errors.TopologyException;
import org.apache.kafka.streams.kstream.internals.ConsumedInternal;
import org.apache.kafka.streams.processor.internals.InternalTopologyBuilder;
import java.util.Collection;
import java.util.Properties;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class StreamSourceNode<K, V> extends SourceGraphNode<K, V> {
private final Logger log = LoggerFactory.getLogger(StreamSourceNode.class);
public StreamSourceNode(final String nodeName,
final Collection<String> topicNames,
final ConsumedInternal<K, V> consumedInternal) {
super(nodeName, topicNames, consumedInternal);
}
public StreamSourceNode(final String nodeName,
final Pattern topicPattern,
final ConsumedInternal<K, V> consumedInternal) {
super(nodeName, topicPattern, consumedInternal);
}
public void merge(final StreamSourceNode<?, ?> other) {
final AutoOffsetReset resetPolicy = consumedInternal().offsetResetPolicy();
final AutoOffsetReset otherResetPolicy = other.consumedInternal().offsetResetPolicy();
if (resetPolicy != null && !resetPolicy.equals(otherResetPolicy)
|| otherResetPolicy != null && !otherResetPolicy.equals(resetPolicy)) {
log.error("Tried to merge source nodes {} and {} which are subscribed to the same topic/pattern, but "
+ "the offset reset policies do not match", this, other);
throw new TopologyException("Can't configure different offset reset policies on the same input topic(s)");
}
for (final GraphNode otherChild : other.children()) {
other.removeChild(otherChild);
addChild(otherChild);
}
}
@Override
public String toString() {
return "StreamSourceNode{" +
"topicNames=" + topicNames() +
", topicPattern=" + topicPattern() +
", consumedInternal=" + consumedInternal() +
"} " + super.toString();
}
@Override
public void writeToTopology(final InternalTopologyBuilder topologyBuilder, final Properties props) {
if (topicPattern() != null) {
topologyBuilder.addSource(consumedInternal().offsetResetPolicy(),
nodeName(),
consumedInternal().timestampExtractor(),
consumedInternal().keyDeserializer(),
consumedInternal().valueDeserializer(),
topicPattern());
} else {
topologyBuilder.addSource(consumedInternal().offsetResetPolicy(),
nodeName(),
consumedInternal().timestampExtractor(),
consumedInternal().keyDeserializer(),
consumedInternal().valueDeserializer(),
topicNames().toArray(new String[0]));
}
}
}