/*
* 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.state.internals;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.internals.ProcessorStateManager;
import org.apache.kafka.streams.processor.internals.RecordCollector;
import org.apache.kafka.streams.state.StateSerdes;
/**
* Note that the use of array-typed keys is discouraged because they result in incorrect caching behavior.
* If you intend to work on byte arrays as key, for example, you may want to wrap them with the {@code Bytes} class,
* i.e. use {@code RocksDBStore<Bytes, ...>} rather than {@code RocksDBStore<byte[], ...>}.
*
* @param <K>
* @param <V>
*/
class StoreChangeLogger<K, V> {
protected final StateSerdes<K, V> serialization;
private final String topic;
private final int partition;
private final ProcessorContext context;
private final RecordCollector collector;
StoreChangeLogger(String storeName, ProcessorContext context, StateSerdes<K, V> serialization) {
this(storeName, context, context.taskId().partition, serialization);
}
private StoreChangeLogger(String storeName, ProcessorContext context, int partition, StateSerdes<K, V> serialization) {
this.topic = ProcessorStateManager.storeChangelogTopic(context.applicationId(), storeName);
this.context = context;
this.partition = partition;
this.serialization = serialization;
this.collector = ((RecordCollector.Supplier) context).recordCollector();
}
void logChange(final K key, final V value) {
if (collector != null) {
final Serializer<K> keySerializer = serialization.keySerializer();
final Serializer<V> valueSerializer = serialization.valueSerializer();
collector.send(this.topic, key, value, this.partition, context.timestamp(), keySerializer, valueSerializer);
}
}
}