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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.streams.kstream.ValueMapperWithKey;
import org.apache.kafka.streams.processor.api.Processor;
import org.apache.kafka.streams.processor.api.ProcessorContext;
import org.apache.kafka.streams.processor.api.Record;
import org.apache.kafka.streams.state.ValueAndTimestamp;
import org.apache.kafka.streams.state.internals.KeyValueStoreWrapper;
import static org.apache.kafka.streams.state.ValueAndTimestamp.getValueOrNull;
import static org.apache.kafka.streams.state.VersionedKeyValueStore.PUT_RETURN_CODE_NOT_PUT;
import static org.apache.kafka.streams.state.internals.KeyValueStoreWrapper.PUT_RETURN_CODE_IS_LATEST;
class KTableMapValues implements KTableProcessorSupplier {
private final KTableImpl parent;
private final ValueMapperWithKey mapper;
private final String queryableName;
private boolean sendOldValues = false;
KTableMapValues(final KTableImpl parent,
final ValueMapperWithKey mapper,
final String queryableName) {
this.parent = parent;
this.mapper = mapper;
this.queryableName = queryableName;
}
@Override
public Processor, KIn, Change> get() {
return new KTableMapValuesProcessor();
}
@Override
public KTableValueGetterSupplier view() {
// if the KTable is materialized, use the materialized store to return getter value;
// otherwise rely on the parent getter and apply map-values on-the-fly
if (queryableName != null) {
return new KTableMaterializedValueGetterSupplier<>(queryableName);
} else {
return new KTableValueGetterSupplier() {
final KTableValueGetterSupplier parentValueGetterSupplier = parent.valueGetterSupplier();
public KTableValueGetter get() {
return new KTableMapValuesValueGetter(parentValueGetterSupplier.get());
}
@Override
public String[] storeNames() {
return parentValueGetterSupplier.storeNames();
}
};
}
}
@Override
public boolean enableSendingOldValues(final boolean forceMaterialization) {
if (queryableName != null) {
sendOldValues = true;
return true;
}
if (parent.enableSendingOldValues(forceMaterialization)) {
sendOldValues = true;
}
return sendOldValues;
}
private VOut computeValue(final KIn key, final VIn value) {
VOut newValue = null;
if (value != null) {
newValue = mapper.apply(key, value);
}
return newValue;
}
private ValueAndTimestamp computeValueAndTimestamp(final KIn key, final ValueAndTimestamp valueAndTimestamp) {
VOut newValue = null;
long timestamp = 0;
if (valueAndTimestamp != null) {
newValue = mapper.apply(key, valueAndTimestamp.value());
timestamp = valueAndTimestamp.timestamp();
}
return ValueAndTimestamp.make(newValue, timestamp);
}
private class KTableMapValuesProcessor implements Processor, KIn, Change> {
private ProcessorContext> context;
private KeyValueStoreWrapper store;
private TimestampedTupleForwarder tupleForwarder;
@Override
public void init(final ProcessorContext> context) {
this.context = context;
if (queryableName != null) {
store = new KeyValueStoreWrapper<>(context, queryableName);
tupleForwarder = new TimestampedTupleForwarder<>(
store.getStore(),
context,
new TimestampedCacheFlushListener<>(context),
sendOldValues);
}
}
@Override
public void process(final Record> record) {
final VOut newValue = computeValue(record.key(), record.value().newValue);
final VOut oldValue = computeOldValue(record.key(), record.value());
if (queryableName != null) {
final long putReturnCode = store.put(record.key(), newValue, record.timestamp());
// if not put to store, do not forward downstream either
if (putReturnCode != PUT_RETURN_CODE_NOT_PUT) {
tupleForwarder.maybeForward(record.withValue(new Change<>(newValue, oldValue, putReturnCode == PUT_RETURN_CODE_IS_LATEST)));
}
} else {
context.forward(record.withValue(new Change<>(newValue, oldValue, record.value().isLatest)));
}
}
private VOut computeOldValue(final KIn key, final Change change) {
if (!sendOldValues) {
return null;
}
return queryableName != null
? getValueOrNull(store.get(key))
: computeValue(key, change.oldValue);
}
}
private class KTableMapValuesValueGetter implements KTableValueGetter {
private final KTableValueGetter parentGetter;
KTableMapValuesValueGetter(final KTableValueGetter parentGetter) {
this.parentGetter = parentGetter;
}
@Override
public void init(final ProcessorContext context) {
parentGetter.init(context);
}
@Override
public ValueAndTimestamp get(final KIn key) {
return computeValueAndTimestamp(key, parentGetter.get(key));
}
@Override
public ValueAndTimestamp get(final KIn key, final long asOfTimestamp) {
return computeValueAndTimestamp(key, parentGetter.get(key, asOfTimestamp));
}
@Override
public boolean isVersioned() {
return parentGetter.isVersioned();
}
@Override
public void close() {
parentGetter.close();
}
}
}
