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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.state.internals;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.processor.StateStoreContext;
import org.apache.kafka.streams.processor.internals.InternalProcessorContext;
import org.apache.kafka.streams.state.KeyValueIterator;
import org.apache.kafka.streams.state.KeyValueStore;
import java.util.List;
import static org.apache.kafka.streams.processor.internals.ProcessorContextUtils.asInternalProcessorContext;
public class ChangeLoggingKeyValueBytesStore
extends WrappedStateStore, byte[], byte[]>
implements KeyValueStore {
InternalProcessorContext context;
ChangeLoggingKeyValueBytesStore(final KeyValueStore inner) {
super(inner);
}
@Deprecated
@Override
public void init(final ProcessorContext context,
final StateStore root) {
this.context = asInternalProcessorContext(context);
super.init(context, root);
maybeSetEvictionListener();
}
@Override
public void init(final StateStoreContext context,
final StateStore root) {
this.context = asInternalProcessorContext(context);
super.init(context, root);
maybeSetEvictionListener();
}
private void maybeSetEvictionListener() {
// if the inner store is an LRU cache, add the eviction listener to log removed record
if (wrapped() instanceof MemoryLRUCache) {
((MemoryLRUCache) wrapped()).setWhenEldestRemoved((key, value) -> {
// pass null to indicate removal
log(key, null, context.timestamp());
});
}
}
@Override
public long approximateNumEntries() {
return wrapped().approximateNumEntries();
}
@Override
public void put(final Bytes key,
final byte[] value) {
wrapped().put(key, value);
log(key, value, context.timestamp());
}
@Override
public byte[] putIfAbsent(final Bytes key,
final byte[] value) {
final byte[] previous = wrapped().putIfAbsent(key, value);
if (previous == null) {
// then it was absent
log(key, value, context.timestamp());
}
return previous;
}
@Override
public void putAll(final List> entries) {
wrapped().putAll(entries);
for (final KeyValue entry : entries) {
log(entry.key, entry.value, context.timestamp());
}
}
@Override
public , P> KeyValueIterator prefixScan(final P prefix,
final PS prefixKeySerializer) {
return wrapped().prefixScan(prefix, prefixKeySerializer);
}
@Override
public byte[] delete(final Bytes key) {
final byte[] oldValue = wrapped().delete(key);
log(key, null, context.timestamp());
return oldValue;
}
@Override
public byte[] get(final Bytes key) {
return wrapped().get(key);
}
@Override
public KeyValueIterator range(final Bytes from,
final Bytes to) {
return wrapped().range(from, to);
}
@Override
public KeyValueIterator reverseRange(final Bytes from,
final Bytes to) {
return wrapped().reverseRange(from, to);
}
@Override
public KeyValueIterator all() {
return wrapped().all();
}
@Override
public KeyValueIterator reverseAll() {
return wrapped().reverseAll();
}
void log(final Bytes key, final byte[] value, final long timestamp) {
context.logChange(name(), key, value, timestamp, wrapped().getPosition());
}
}