dev.responsive.kafka.internal.db.SessionKeySpec Maven / Gradle / Ivy
/*
* Copyright 2024 Responsive Computing, Inc.
*
* Licensed 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 dev.responsive.kafka.internal.db;
import static org.apache.kafka.streams.state.StateSerdes.TIMESTAMP_SIZE;
import dev.responsive.kafka.internal.utils.SessionKey;
import java.nio.ByteBuffer;
import java.util.function.Predicate;
import org.apache.kafka.clients.consumer.ConsumerRecord;
public class SessionKeySpec implements KeySpec {
private final Predicate withinRetention;
public SessionKeySpec(final Predicate withinRetention) {
this.withinRetention = withinRetention;
}
@Override
public SessionKey keyFromRecord(final ConsumerRecord record) {
final byte[] key = record.key();
return new SessionKey(
extractKeyBytes(key),
extractStartTimestamp(key),
extractEndTimestamp(key)
);
}
@Override
public boolean retain(final SessionKey key) {
return withinRetention.test(key);
}
/*
* Inspired from KafkaStream internal functions within SessionKeySchema.
*/
@Override
public int sizeInBytes(final SessionKey key) {
return (key == null ? 0 : key.key.get().length) + 2 * TIMESTAMP_SIZE;
}
/*
* Inspired from KafkaStream internal functions within SessionKeySchema.
*/
private static byte[] extractKeyBytes(final byte[] binaryKey) {
final byte[] bytes = new byte[binaryKey.length - 2 * TIMESTAMP_SIZE];
System.arraycopy(binaryKey, 0, bytes, 0, bytes.length);
return bytes;
}
/*
* Inspired from KafkaStream internal functions within SessionKeySchema.
*/
private static long extractEndTimestamp(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getLong(binaryKey.length - 2 * TIMESTAMP_SIZE);
}
/*
* Inspired from KafkaStream internal functions within SessionKeySchema.
*/
private static long extractStartTimestamp(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getLong(binaryKey.length - TIMESTAMP_SIZE);
}
}