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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.Deserializer;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.kstream.Window;
import org.apache.kafka.streams.kstream.Windowed;
import org.apache.kafka.streams.kstream.internals.SessionWindow;
import static org.apache.kafka.streams.state.StateSerdes.TIMESTAMP_SIZE;
import java.nio.ByteBuffer;
import java.util.List;
public class SessionKeySchema implements SegmentedBytesStore.KeySchema {
private static final int SUFFIX_SIZE = 2 * TIMESTAMP_SIZE;
private static final byte[] MIN_SUFFIX = new byte[SUFFIX_SIZE];
public static int keyByteLength(final Bytes key) {
return (key == null ? 0 : key.get().length) + 2 * TIMESTAMP_SIZE;
}
@Override
public Bytes upperRangeFixedSize(final Bytes key, final long to) {
final Windowed sessionKey = upperRangeFixedWindow(key, to);
return SessionKeySchema.toBinary(sessionKey);
}
public static Windowed upperRangeFixedWindow(final K key, final long to) {
return new Windowed(key, new SessionWindow(to, Long.MAX_VALUE));
}
@Override
public Bytes lowerRangeFixedSize(final Bytes key, final long from) {
final Windowed sessionKey = lowerRangeFixedWindow(key, from);
return SessionKeySchema.toBinary(sessionKey);
}
public static Windowed lowerRangeFixedWindow(final K key, final long from) {
return new Windowed(key, new SessionWindow(0, Math.max(0, from)));
}
@Override
public Bytes upperRange(final Bytes key, final long to) {
if (key == null) {
return null;
}
final byte[] maxSuffix = ByteBuffer.allocate(SUFFIX_SIZE)
// the end timestamp can be as large as possible as long as it's larger than start time
.putLong(Long.MAX_VALUE)
// this is the start timestamp
.putLong(to)
.array();
return OrderedBytes.upperRange(key, maxSuffix);
}
@Override
public Bytes lowerRange(final Bytes key, final long from) {
if (key == null) {
return null;
}
return OrderedBytes.lowerRange(key, MIN_SUFFIX);
}
@Override
public long segmentTimestamp(final Bytes key) {
return SessionKeySchema.extractEndTimestamp(key.get());
}
@Override
public HasNextCondition hasNextCondition(final Bytes binaryKeyFrom, final Bytes binaryKeyTo, final long from, final long to, final boolean forward) {
return iterator -> {
while (iterator.hasNext()) {
final Bytes bytes = iterator.peekNextKey();
final Windowed windowedKey = SessionKeySchema.from(bytes);
if ((binaryKeyFrom == null || windowedKey.key().compareTo(binaryKeyFrom) >= 0)
&& (binaryKeyTo == null || windowedKey.key().compareTo(binaryKeyTo) <= 0)
&& windowedKey.window().end() >= from
&& windowedKey.window().start() <= to) {
return true;
}
iterator.next();
}
return false;
};
}
@Override
public List segmentsToSearch(final Segments segments,
final long from,
final long to,
final boolean forward) {
return segments.segments(from, Long.MAX_VALUE, forward);
}
private static K extractKey(final byte[] binaryKey,
final Deserializer deserializer,
final String topic) {
return deserializer.deserialize(topic, extractKeyBytes(binaryKey));
}
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;
}
static long extractEndTimestamp(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getLong(binaryKey.length - 2 * TIMESTAMP_SIZE);
}
static long extractStartTimestamp(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getLong(binaryKey.length - TIMESTAMP_SIZE);
}
static Window extractWindow(final byte[] binaryKey) {
final ByteBuffer buffer = ByteBuffer.wrap(binaryKey);
final long start = buffer.getLong(binaryKey.length - TIMESTAMP_SIZE);
final long end = buffer.getLong(binaryKey.length - 2 * TIMESTAMP_SIZE);
return new SessionWindow(start, end);
}
public static Windowed from(final byte[] binaryKey,
final Deserializer keyDeserializer,
final String topic) {
final K key = extractKey(binaryKey, keyDeserializer, topic);
final Window window = extractWindow(binaryKey);
return new Windowed<>(key, window);
}
public static Windowed from(final Bytes bytesKey) {
final byte[] binaryKey = bytesKey.get();
final Window window = extractWindow(binaryKey);
return new Windowed<>(Bytes.wrap(extractKeyBytes(binaryKey)), window);
}
public static Windowed from(final Windowed keyBytes,
final Deserializer keyDeserializer,
final String topic) {
final K key = keyDeserializer.deserialize(topic, keyBytes.key().get());
return new Windowed<>(key, keyBytes.window());
}
public static byte[] toBinary(final Windowed sessionKey,
final Serializer serializer,
final String topic) {
final byte[] bytes = serializer.serialize(topic, sessionKey.key());
return toBinary(Bytes.wrap(bytes), sessionKey.window().start(), sessionKey.window().end()).get();
}
public static Bytes toBinary(final Windowed sessionKey) {
return toBinary(sessionKey.key(), sessionKey.window().start(), sessionKey.window().end());
}
public static Bytes toBinary(final Bytes key,
final long startTime,
final long endTime) {
final ByteBuffer buf = ByteBuffer.allocate(keyByteLength(key));
writeBinary(buf, key, startTime, endTime);
return Bytes.wrap(buf.array());
}
public static void writeBinary(final ByteBuffer buf, final Windowed sessionKey) {
writeBinary(buf, sessionKey.key(), sessionKey.window().start(), sessionKey.window().end());
}
public static void writeBinary(final ByteBuffer buf,
final Bytes key,
final long startTime,
final long endTime) {
// we search for the session window that can overlap with the [ESET, LSST] range
// since the session window length can vary, we define the search boundary as:
// lower: [0, ESET]
// upper: [LSST, INF]
// and by putting the end time first and then the start time, the serialized search boundary
// is: [(ESET-0), (INF-LSST)]
buf.put(key.get());
buf.putLong(endTime);
buf.putLong(startTime);
}
}
