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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.foreignkeyjoin;
import org.apache.kafka.common.metrics.Sensor;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.streams.kstream.internals.Change;
import org.apache.kafka.streams.processor.AbstractProcessor;
import org.apache.kafka.streams.processor.Processor;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.ProcessorSupplier;
import org.apache.kafka.streams.processor.internals.metrics.StreamsMetricsImpl;
import org.apache.kafka.streams.processor.internals.metrics.TaskMetrics;
import org.apache.kafka.streams.state.internals.Murmur3;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Arrays;
import java.util.function.Function;
import java.util.function.Supplier;
import static org.apache.kafka.streams.kstream.internals.foreignkeyjoin.SubscriptionWrapper.Instruction.DELETE_KEY_AND_PROPAGATE;
import static org.apache.kafka.streams.kstream.internals.foreignkeyjoin.SubscriptionWrapper.Instruction.DELETE_KEY_NO_PROPAGATE;
import static org.apache.kafka.streams.kstream.internals.foreignkeyjoin.SubscriptionWrapper.Instruction.PROPAGATE_NULL_IF_NO_FK_VAL_AVAILABLE;
import static org.apache.kafka.streams.kstream.internals.foreignkeyjoin.SubscriptionWrapper.Instruction.PROPAGATE_ONLY_IF_FK_VAL_AVAILABLE;
public class ForeignJoinSubscriptionSendProcessorSupplier implements ProcessorSupplier> {
private static final Logger LOG = LoggerFactory.getLogger(ForeignJoinSubscriptionSendProcessorSupplier.class);
private final Function foreignKeyExtractor;
private final Supplier foreignKeySerdeTopicSupplier;
private final Supplier valueSerdeTopicSupplier;
private final boolean leftJoin;
private Serializer foreignKeySerializer;
private Serializer valueSerializer;
public ForeignJoinSubscriptionSendProcessorSupplier(final Function foreignKeyExtractor,
final Supplier foreignKeySerdeTopicSupplier,
final Supplier valueSerdeTopicSupplier,
final Serde foreignKeySerde,
final Serializer valueSerializer,
final boolean leftJoin) {
this.foreignKeyExtractor = foreignKeyExtractor;
this.foreignKeySerdeTopicSupplier = foreignKeySerdeTopicSupplier;
this.valueSerdeTopicSupplier = valueSerdeTopicSupplier;
this.valueSerializer = valueSerializer;
this.leftJoin = leftJoin;
foreignKeySerializer = foreignKeySerde == null ? null : foreignKeySerde.serializer();
}
@Override
public Processor> get() {
return new UnbindChangeProcessor();
}
private class UnbindChangeProcessor extends AbstractProcessor> {
private Sensor droppedRecordsSensor;
private String foreignKeySerdeTopic;
private String valueSerdeTopic;
@SuppressWarnings("unchecked")
@Override
public void init(final ProcessorContext context) {
super.init(context);
foreignKeySerdeTopic = foreignKeySerdeTopicSupplier.get();
valueSerdeTopic = valueSerdeTopicSupplier.get();
// get default key serde if it wasn't supplied directly at construction
if (foreignKeySerializer == null) {
foreignKeySerializer = (Serializer) context.keySerde().serializer();
}
if (valueSerializer == null) {
valueSerializer = (Serializer) context.valueSerde().serializer();
}
droppedRecordsSensor = TaskMetrics.droppedRecordsSensorOrSkippedRecordsSensor(
Thread.currentThread().getName(),
context.taskId().toString(),
(StreamsMetricsImpl) context.metrics()
);
}
@Override
public void process(final K key, final Change change) {
final long[] currentHash = change.newValue == null ?
null :
Murmur3.hash128(valueSerializer.serialize(valueSerdeTopic, change.newValue));
if (change.oldValue != null) {
final KO oldForeignKey = foreignKeyExtractor.apply(change.oldValue);
if (oldForeignKey == null) {
LOG.warn(
"Skipping record due to null foreign key. value=[{}] topic=[{}] partition=[{}] offset=[{}]",
change.oldValue, context().topic(), context().partition(), context().offset()
);
droppedRecordsSensor.record();
return;
}
if (change.newValue != null) {
final KO newForeignKey = foreignKeyExtractor.apply(change.newValue);
if (newForeignKey == null) {
LOG.warn(
"Skipping record due to null foreign key. value=[{}] topic=[{}] partition=[{}] offset=[{}]",
change.newValue, context().topic(), context().partition(), context().offset()
);
droppedRecordsSensor.record();
return;
}
final byte[] serialOldForeignKey =
foreignKeySerializer.serialize(foreignKeySerdeTopic, oldForeignKey);
final byte[] serialNewForeignKey =
foreignKeySerializer.serialize(foreignKeySerdeTopic, newForeignKey);
if (!Arrays.equals(serialNewForeignKey, serialOldForeignKey)) {
//Different Foreign Key - delete the old key value and propagate the new one.
//Delete it from the oldKey's state store
context().forward(oldForeignKey, new SubscriptionWrapper<>(currentHash, DELETE_KEY_NO_PROPAGATE, key));
//Add to the newKey's state store. Additionally, propagate null if no FK is found there,
//since we must "unset" any output set by the previous FK-join. This is true for both INNER
//and LEFT join.
}
context().forward(newForeignKey, new SubscriptionWrapper<>(currentHash, PROPAGATE_NULL_IF_NO_FK_VAL_AVAILABLE, key));
} else {
//A simple propagatable delete. Delete from the state store and propagate the delete onwards.
context().forward(oldForeignKey, new SubscriptionWrapper<>(currentHash, DELETE_KEY_AND_PROPAGATE, key));
}
} else if (change.newValue != null) {
//change.oldValue is null, which means it was deleted at least once before, or it is brand new.
//In either case, we only need to propagate if the FK_VAL is available, as the null from the delete would
//have been propagated otherwise.
final SubscriptionWrapper.Instruction instruction;
if (leftJoin) {
//Want to send info even if RHS is null.
instruction = PROPAGATE_NULL_IF_NO_FK_VAL_AVAILABLE;
} else {
instruction = PROPAGATE_ONLY_IF_FK_VAL_AVAILABLE;
}
final KO newForeignKey = foreignKeyExtractor.apply(change.newValue);
if (newForeignKey == null) {
LOG.warn(
"Skipping record due to null foreign key. value=[{}] topic=[{}] partition=[{}] offset=[{}]",
change.newValue, context().topic(), context().partition(), context().offset()
);
droppedRecordsSensor.record();
} else {
context().forward(newForeignKey, new SubscriptionWrapper<>(currentHash, instruction, key));
}
}
}
}
}
