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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.serialization.Serde;
import org.apache.kafka.streams.errors.StreamsException;
import org.apache.kafka.streams.kstream.JoinWindows;
import org.apache.kafka.streams.kstream.KStream;
import org.apache.kafka.streams.kstream.StreamJoined;
import org.apache.kafka.streams.kstream.ValueJoiner;
import org.apache.kafka.streams.kstream.internals.graph.ProcessorGraphNode;
import org.apache.kafka.streams.kstream.internals.graph.ProcessorParameters;
import org.apache.kafka.streams.kstream.internals.graph.StreamStreamJoinNode;
import org.apache.kafka.streams.kstream.internals.graph.StreamsGraphNode;
import org.apache.kafka.streams.state.StoreBuilder;
import org.apache.kafka.streams.state.Stores;
import org.apache.kafka.streams.state.WindowBytesStoreSupplier;
import org.apache.kafka.streams.state.WindowStore;
import java.time.Duration;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
class KStreamImplJoin {
private final InternalStreamsBuilder builder;
private final boolean leftOuter;
private final boolean rightOuter;
KStreamImplJoin(final InternalStreamsBuilder builder,
final boolean leftOuter,
final boolean rightOuter) {
this.builder = builder;
this.leftOuter = leftOuter;
this.rightOuter = rightOuter;
}
public KStream join(final KStream lhs,
final KStream other,
final ValueJoiner joiner,
final JoinWindows windows,
final StreamJoined streamJoined) {
final StreamJoinedInternal streamJoinedInternal = new StreamJoinedInternal<>(streamJoined);
final NamedInternal renamed = new NamedInternal(streamJoinedInternal.name());
final String joinThisSuffix = rightOuter ? "-outer-this-join" : "-this-join";
final String joinOtherSuffix = leftOuter ? "-outer-other-join" : "-other-join";
final String thisWindowStreamProcessorName = renamed.suffixWithOrElseGet(
"-this-windowed", builder, KStreamImpl.WINDOWED_NAME);
final String otherWindowStreamProcessorName = renamed.suffixWithOrElseGet(
"-other-windowed", builder, KStreamImpl.WINDOWED_NAME);
final String joinThisGeneratedName = rightOuter ? builder.newProcessorName(KStreamImpl.OUTERTHIS_NAME) : builder.newProcessorName(KStreamImpl.JOINTHIS_NAME);
final String joinOtherGeneratedName = leftOuter ? builder.newProcessorName(KStreamImpl.OUTEROTHER_NAME) : builder.newProcessorName(KStreamImpl.JOINOTHER_NAME);
final String joinThisName = renamed.suffixWithOrElseGet(joinThisSuffix, joinThisGeneratedName);
final String joinOtherName = renamed.suffixWithOrElseGet(joinOtherSuffix, joinOtherGeneratedName);
final String joinMergeName = renamed.suffixWithOrElseGet(
"-merge", builder, KStreamImpl.MERGE_NAME);
final StreamsGraphNode thisStreamsGraphNode = ((AbstractStream) lhs).streamsGraphNode;
final StreamsGraphNode otherStreamsGraphNode = ((AbstractStream) other).streamsGraphNode;
final StoreBuilder> thisWindowStore;
final StoreBuilder> otherWindowStore;
final String userProvidedBaseStoreName = streamJoinedInternal.storeName();
final WindowBytesStoreSupplier thisStoreSupplier = streamJoinedInternal.thisStoreSupplier();
final WindowBytesStoreSupplier otherStoreSupplier = streamJoinedInternal.otherStoreSupplier();
assertUniqueStoreNames(thisStoreSupplier, otherStoreSupplier);
if (thisStoreSupplier == null) {
final String thisJoinStoreName = userProvidedBaseStoreName == null ? joinThisGeneratedName : userProvidedBaseStoreName + joinThisSuffix;
thisWindowStore = joinWindowStoreBuilder(thisJoinStoreName, windows, streamJoinedInternal.keySerde(), streamJoinedInternal.valueSerde());
} else {
assertWindowSettings(thisStoreSupplier, windows);
thisWindowStore = joinWindowStoreBuilderFromSupplier(thisStoreSupplier, streamJoinedInternal.keySerde(), streamJoinedInternal.valueSerde());
}
if (otherStoreSupplier == null) {
final String otherJoinStoreName = userProvidedBaseStoreName == null ? joinOtherGeneratedName : userProvidedBaseStoreName + joinOtherSuffix;
otherWindowStore = joinWindowStoreBuilder(otherJoinStoreName, windows, streamJoinedInternal.keySerde(), streamJoinedInternal.otherValueSerde());
} else {
assertWindowSettings(otherStoreSupplier, windows);
otherWindowStore = joinWindowStoreBuilderFromSupplier(otherStoreSupplier, streamJoinedInternal.keySerde(), streamJoinedInternal.otherValueSerde());
}
final KStreamJoinWindow thisWindowedStream = new KStreamJoinWindow<>(thisWindowStore.name());
final ProcessorParameters thisWindowStreamProcessorParams = new ProcessorParameters<>(thisWindowedStream, thisWindowStreamProcessorName);
final ProcessorGraphNode thisWindowedStreamsNode = new ProcessorGraphNode<>(thisWindowStreamProcessorName, thisWindowStreamProcessorParams);
builder.addGraphNode(thisStreamsGraphNode, thisWindowedStreamsNode);
final KStreamJoinWindow otherWindowedStream = new KStreamJoinWindow<>(otherWindowStore.name());
final ProcessorParameters otherWindowStreamProcessorParams = new ProcessorParameters<>(otherWindowedStream, otherWindowStreamProcessorName);
final ProcessorGraphNode otherWindowedStreamsNode = new ProcessorGraphNode<>(otherWindowStreamProcessorName, otherWindowStreamProcessorParams);
builder.addGraphNode(otherStreamsGraphNode, otherWindowedStreamsNode);
final KStreamKStreamJoin joinThis = new KStreamKStreamJoin<>(
otherWindowStore.name(),
windows.beforeMs,
windows.afterMs,
joiner,
leftOuter
);
final KStreamKStreamJoin joinOther = new KStreamKStreamJoin<>(
thisWindowStore.name(),
windows.afterMs,
windows.beforeMs,
AbstractStream.reverseJoiner(joiner),
rightOuter
);
final PassThrough joinMerge = new PassThrough<>();
final StreamStreamJoinNode.StreamStreamJoinNodeBuilder joinBuilder = StreamStreamJoinNode.streamStreamJoinNodeBuilder();
final ProcessorParameters joinThisProcessorParams = new ProcessorParameters<>(joinThis, joinThisName);
final ProcessorParameters joinOtherProcessorParams = new ProcessorParameters<>(joinOther, joinOtherName);
final ProcessorParameters joinMergeProcessorParams = new ProcessorParameters<>(joinMerge, joinMergeName);
joinBuilder.withJoinMergeProcessorParameters(joinMergeProcessorParams)
.withJoinThisProcessorParameters(joinThisProcessorParams)
.withJoinOtherProcessorParameters(joinOtherProcessorParams)
.withThisWindowStoreBuilder(thisWindowStore)
.withOtherWindowStoreBuilder(otherWindowStore)
.withThisWindowedStreamProcessorParameters(thisWindowStreamProcessorParams)
.withOtherWindowedStreamProcessorParameters(otherWindowStreamProcessorParams)
.withValueJoiner(joiner)
.withNodeName(joinMergeName);
final StreamsGraphNode joinGraphNode = joinBuilder.build();
builder.addGraphNode(Arrays.asList(thisStreamsGraphNode, otherStreamsGraphNode), joinGraphNode);
final Set allSourceNodes = new HashSet<>(((KStreamImpl) lhs).subTopologySourceNodes);
allSourceNodes.addAll(((KStreamImpl) other).subTopologySourceNodes);
// do not have serde for joined result;
// also for key serde we do not inherit from either since we cannot tell if these two serdes are different
return new KStreamImpl<>(joinMergeName, streamJoinedInternal.keySerde(), null, allSourceNodes, false, joinGraphNode, builder);
}
private void assertWindowSettings(final WindowBytesStoreSupplier supplier, final JoinWindows joinWindows) {
if (!supplier.retainDuplicates()) {
throw new StreamsException("The StoreSupplier must set retainDuplicates=true, found retainDuplicates=false");
}
final boolean allMatch = supplier.retentionPeriod() == (joinWindows.size() + joinWindows.gracePeriodMs()) &&
supplier.windowSize() == joinWindows.size();
if (!allMatch) {
throw new StreamsException(String.format("Window settings mismatch. WindowBytesStoreSupplier settings %s must match JoinWindows settings %s" +
" for the window size and retention period", supplier, joinWindows));
}
}
private void assertUniqueStoreNames(final WindowBytesStoreSupplier supplier,
final WindowBytesStoreSupplier otherSupplier) {
if (supplier != null
&& otherSupplier != null
&& supplier.name().equals(otherSupplier.name())) {
throw new StreamsException("Both StoreSuppliers have the same name. StoreSuppliers must provide unique names");
}
}
private static StoreBuilder> joinWindowStoreBuilder(final String storeName,
final JoinWindows windows,
final Serde keySerde,
final Serde valueSerde) {
return Stores.windowStoreBuilder(
Stores.persistentWindowStore(
storeName + "-store",
Duration.ofMillis(windows.size() + windows.gracePeriodMs()),
Duration.ofMillis(windows.size()),
true
),
keySerde,
valueSerde
);
}
private static StoreBuilder> joinWindowStoreBuilderFromSupplier(final WindowBytesStoreSupplier storeSupplier,
final Serde keySerde,
final Serde valueSerde) {
return Stores.windowStoreBuilder(
storeSupplier,
keySerde,
valueSerde
);
}
}
