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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.clients.consumer.ConsumerRecord;
import org.apache.kafka.common.metrics.Sensor;
import org.apache.kafka.streams.kstream.Aggregator;
import org.apache.kafka.streams.kstream.Initializer;
import org.apache.kafka.streams.kstream.Window;
import org.apache.kafka.streams.kstream.Windowed;
import org.apache.kafka.streams.kstream.Windows;
import org.apache.kafka.streams.processor.internals.InternalProcessorContext;
import org.apache.kafka.streams.processor.internals.metrics.StreamsMetricsImpl;
import org.apache.kafka.streams.state.TimestampedWindowStore;
import org.apache.kafka.streams.state.ValueAndTimestamp;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Map;
import static org.apache.kafka.streams.processor.internals.metrics.TaskMetrics.droppedRecordsSensor;
import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
@SuppressWarnings("deprecation") // Old PAPI. Needs to be migrated.
public class KStreamWindowAggregate implements KStreamAggProcessorSupplier, V, Agg> {
private final Logger log = LoggerFactory.getLogger(getClass());
private final String storeName;
private final Windows windows;
private final Initializer initializer;
private final Aggregator aggregator;
private boolean sendOldValues = false;
public KStreamWindowAggregate(final Windows windows,
final String storeName,
final Initializer initializer,
final Aggregator aggregator) {
this.windows = windows;
this.storeName = storeName;
this.initializer = initializer;
this.aggregator = aggregator;
}
@Override
public org.apache.kafka.streams.processor.Processor get() {
return new KStreamWindowAggregateProcessor();
}
public Windows windows() {
return windows;
}
@Override
public void enableSendingOldValues() {
sendOldValues = true;
}
private class KStreamWindowAggregateProcessor extends org.apache.kafka.streams.processor.AbstractProcessor {
private TimestampedWindowStore windowStore;
private TimestampedTupleForwarder, Agg> tupleForwarder;
private Sensor droppedRecordsSensor;
private long observedStreamTime = ConsumerRecord.NO_TIMESTAMP;
@Override
public void init(final org.apache.kafka.streams.processor.ProcessorContext context) {
super.init(context);
final InternalProcessorContext internalProcessorContext = (InternalProcessorContext) context;
final StreamsMetricsImpl metrics = internalProcessorContext.metrics();
final String threadId = Thread.currentThread().getName();
droppedRecordsSensor = droppedRecordsSensor(threadId, context.taskId().toString(), metrics);
windowStore = context.getStateStore(storeName);
tupleForwarder = new TimestampedTupleForwarder<>(
windowStore,
context,
new TimestampedCacheFlushListener<>(context),
sendOldValues);
}
@Override
public void process(final K key, final V value) {
if (key == null) {
log.warn(
"Skipping record due to null key. value=[{}] topic=[{}] partition=[{}] offset=[{}]",
value, context().topic(), context().partition(), context().offset()
);
droppedRecordsSensor.record();
return;
}
// first get the matching windows
final long timestamp = context().timestamp();
observedStreamTime = Math.max(observedStreamTime, timestamp);
final long closeTime = observedStreamTime - windows.gracePeriodMs();
final Map matchedWindows = windows.windowsFor(timestamp);
// try update the window, and create the new window for the rest of unmatched window that do not exist yet
for (final Map.Entry entry : matchedWindows.entrySet()) {
final Long windowStart = entry.getKey();
final long windowEnd = entry.getValue().end();
if (windowEnd > closeTime) {
final ValueAndTimestamp oldAggAndTimestamp = windowStore.fetch(key, windowStart);
Agg oldAgg = getValueOrNull(oldAggAndTimestamp);
final Agg newAgg;
final long newTimestamp;
if (oldAgg == null) {
oldAgg = initializer.apply();
newTimestamp = context().timestamp();
} else {
newTimestamp = Math.max(context().timestamp(), oldAggAndTimestamp.timestamp());
}
newAgg = aggregator.apply(key, value, oldAgg);
// update the store with the new value
windowStore.put(key, ValueAndTimestamp.make(newAgg, newTimestamp), windowStart);
tupleForwarder.maybeForward(
new Windowed<>(key, entry.getValue()),
newAgg,
sendOldValues ? oldAgg : null,
newTimestamp);
} else {
log.warn(
"Skipping record for expired window. " +
"key=[{}] " +
"topic=[{}] " +
"partition=[{}] " +
"offset=[{}] " +
"timestamp=[{}] " +
"window=[{},{}) " +
"expiration=[{}] " +
"streamTime=[{}]",
key,
context().topic(),
context().partition(),
context().offset(),
context().timestamp(),
windowStart, windowEnd,
closeTime,
observedStreamTime
);
droppedRecordsSensor.record();
}
}
}
}
@Override
public KTableValueGetterSupplier, Agg> view() {
return new KTableValueGetterSupplier, Agg>() {
public KTableValueGetter, Agg> get() {
return new KStreamWindowAggregateValueGetter();
}
@Override
public String[] storeNames() {
return new String[] {storeName};
}
};
}
private class KStreamWindowAggregateValueGetter implements KTableValueGetter, Agg> {
private TimestampedWindowStore windowStore;
@Override
public void init(final org.apache.kafka.streams.processor.ProcessorContext context) {
windowStore = context.getStateStore(storeName);
}
@SuppressWarnings("unchecked")
@Override
public ValueAndTimestamp get(final Windowed windowedKey) {
final K key = windowedKey.key();
final W window = (W) windowedKey.window();
return windowStore.fetch(key, window.start());
}
}
}
