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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;
import org.apache.kafka.common.metrics.Sensor;
import org.apache.kafka.streams.kstream.ValueJoiner;
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.To;
import org.apache.kafka.streams.processor.internals.metrics.StreamsMetricsImpl;
import org.apache.kafka.streams.state.ValueAndTimestamp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.kafka.streams.processor.internals.metrics.TaskMetrics.droppedRecordsSensorOrSkippedRecordsSensor;
import static org.apache.kafka.streams.processor.internals.RecordQueue.UNKNOWN;
import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
class KTableKTableLeftJoin extends KTableKTableAbstractJoin {
private static final Logger LOG = LoggerFactory.getLogger(KTableKTableLeftJoin.class);
KTableKTableLeftJoin(final KTableImpl table1,
final KTableImpl table2,
final ValueJoiner joiner) {
super(table1, table2, joiner);
}
@Override
public Processor> get() {
return new KTableKTableLeftJoinProcessor(valueGetterSupplier2.get());
}
@Override
public KTableValueGetterSupplier view() {
return new KTableKTableLeftJoinValueGetterSupplier(valueGetterSupplier1, valueGetterSupplier2);
}
private class KTableKTableLeftJoinValueGetterSupplier extends KTableKTableAbstractJoinValueGetterSupplier {
KTableKTableLeftJoinValueGetterSupplier(final KTableValueGetterSupplier valueGetterSupplier1,
final KTableValueGetterSupplier valueGetterSupplier2) {
super(valueGetterSupplier1, valueGetterSupplier2);
}
public KTableValueGetter get() {
return new KTableKTableLeftJoinValueGetter(valueGetterSupplier1.get(), valueGetterSupplier2.get());
}
}
private class KTableKTableLeftJoinProcessor extends AbstractProcessor> {
private final KTableValueGetter valueGetter;
private StreamsMetricsImpl metrics;
private Sensor droppedRecordsSensor;
KTableKTableLeftJoinProcessor(final KTableValueGetter valueGetter) {
this.valueGetter = valueGetter;
}
@Override
public void init(final ProcessorContext context) {
super.init(context);
metrics = (StreamsMetricsImpl) context.metrics();
droppedRecordsSensor = droppedRecordsSensorOrSkippedRecordsSensor(Thread.currentThread().getName(), context.taskId().toString(), metrics);
valueGetter.init(context);
}
@Override
public void process(final K key, final Change change) {
// we do join iff keys are equal, thus, if key is null we cannot join and just ignore the record
if (key == null) {
LOG.warn(
"Skipping record due to null key. change=[{}] topic=[{}] partition=[{}] offset=[{}]",
change, context().topic(), context().partition(), context().offset()
);
droppedRecordsSensor.record();
return;
}
R newValue = null;
final long resultTimestamp;
R oldValue = null;
final ValueAndTimestamp valueAndTimestampRight = valueGetter.get(key);
final V2 value2 = getValueOrNull(valueAndTimestampRight);
final long timestampRight;
if (value2 == null) {
if (change.newValue == null && change.oldValue == null) {
return;
}
timestampRight = UNKNOWN;
} else {
timestampRight = valueAndTimestampRight.timestamp();
}
resultTimestamp = Math.max(context().timestamp(), timestampRight);
if (change.newValue != null) {
newValue = joiner.apply(change.newValue, value2);
}
if (sendOldValues && change.oldValue != null) {
oldValue = joiner.apply(change.oldValue, value2);
}
context().forward(key, new Change<>(newValue, oldValue), To.all().withTimestamp(resultTimestamp));
}
@Override
public void close() {
valueGetter.close();
}
}
private class KTableKTableLeftJoinValueGetter implements KTableValueGetter {
private final KTableValueGetter valueGetter1;
private final KTableValueGetter valueGetter2;
KTableKTableLeftJoinValueGetter(final KTableValueGetter valueGetter1,
final KTableValueGetter valueGetter2) {
this.valueGetter1 = valueGetter1;
this.valueGetter2 = valueGetter2;
}
@Override
public void init(final ProcessorContext context) {
valueGetter1.init(context);
valueGetter2.init(context);
}
@Override
public ValueAndTimestamp get(final K key) {
final ValueAndTimestamp valueAndTimestamp1 = valueGetter1.get(key);
final V1 value1 = getValueOrNull(valueAndTimestamp1);
if (value1 != null) {
final ValueAndTimestamp valueAndTimestamp2 = valueGetter2.get(key);
final V2 value2 = getValueOrNull(valueAndTimestamp2);
final long resultTimestamp;
if (valueAndTimestamp2 == null) {
resultTimestamp = valueAndTimestamp1.timestamp();
} else {
resultTimestamp = Math.max(valueAndTimestamp1.timestamp(), valueAndTimestamp2.timestamp());
}
return ValueAndTimestamp.make(joiner.apply(value1, value2), resultTimestamp);
} else {
return null;
}
}
@Override
public void close() {
valueGetter1.close();
valueGetter2.close();
}
}
}
