kafka PrefixedWindowKeySchemas 源码
kafka PrefixedWindowKeySchemas 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/internals/PrefixedWindowKeySchemas.java
/*
* 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 java.util.Arrays;
import org.apache.kafka.common.serialization.Deserializer;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.kstream.Window;
import org.apache.kafka.streams.kstream.Windowed;
import java.nio.ByteBuffer;
import java.util.List;
import org.apache.kafka.streams.state.StateSerdes;
import org.apache.kafka.streams.state.internals.SegmentedBytesStore.KeySchema;
import static org.apache.kafka.streams.state.StateSerdes.TIMESTAMP_SIZE;
import static org.apache.kafka.streams.state.internals.WindowKeySchema.timeWindowForSize;
public class PrefixedWindowKeySchemas {
private static final int PREFIX_SIZE = 1;
private static final byte TIME_FIRST_PREFIX = 0;
private static final byte KEY_FIRST_PREFIX = 1;
private static final int SEQNUM_SIZE = 4;
private static byte extractPrefix(final byte[] binaryBytes) {
return binaryBytes[0];
}
public static boolean isTimeFirstSchemaKey(final byte[] binaryBytes) {
return binaryBytes.length > 0 && binaryBytes[0] == TIME_FIRST_PREFIX;
}
public static class TimeFirstWindowKeySchema implements KeySchema {
@Override
public Bytes upperRange(final Bytes key, final long to) {
if (key == null) {
// Put next prefix instead of null so that we can start from right prefix
// when scanning backwards
final byte nextPrefix = TIME_FIRST_PREFIX + 1;
return Bytes.wrap(ByteBuffer.allocate(PREFIX_SIZE).put(nextPrefix).array());
}
final byte[] maxKey = new byte[key.get().length];
Arrays.fill(maxKey, (byte) 0xFF);
return Bytes.wrap(ByteBuffer.allocate(PREFIX_SIZE + TIMESTAMP_SIZE + maxKey.length + SEQNUM_SIZE)
.put(TIME_FIRST_PREFIX)
.putLong(to)
.put(maxKey).putInt(Integer.MAX_VALUE)
.array());
}
@Override
public Bytes lowerRange(final Bytes key, final long from) {
if (key == null) {
return Bytes.wrap(ByteBuffer.allocate(PREFIX_SIZE + TIMESTAMP_SIZE)
.put(TIME_FIRST_PREFIX)
.putLong(from)
.array());
}
/*
* Larger timestamp or key's byte order can't be smaller than this lower range. Reason:
* 1. Timestamp is fixed length (with big endian byte order). Since we put timestamp
* first, larger timestamp will have larger byte order.
* 2. If timestamp is the same but key (k1) is larger than this lower range key (k2):
* a. If k2 is not a prefix of k1, then k1 will always have larger byte order no
* matter what seqnum k2 has
* b. If k2 is a prefix of k1, since k2's seqnum is 0, after k1 appends seqnum,
* it will always be larger than (k1 + seqnum).
*/
return Bytes.wrap(ByteBuffer.allocate(PREFIX_SIZE + TIMESTAMP_SIZE + key.get().length)
.put(TIME_FIRST_PREFIX)
.putLong(from)
.put(key.get())
.array());
}
@Override
public Bytes lowerRangeFixedSize(final Bytes key, final long from) {
return toStoreKeyBinary(key, Math.max(0, from), 0);
}
@Override
public Bytes upperRangeFixedSize(final Bytes key, final long to) {
return toStoreKeyBinary(key, to, Integer.MAX_VALUE);
}
@Override
public long segmentTimestamp(final Bytes key) {
return extractStoreTimestamp(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 byte prefix = extractPrefix(bytes.get());
if (prefix != TIME_FIRST_PREFIX) {
return false;
}
final long time = TimeFirstWindowKeySchema.extractStoreTimestamp(bytes.get());
// We can return false directly here since keys are sorted by time and if
// we get time larger than `to`, there won't be time within range.
if (forward && time > to) {
return false;
}
if (!forward && time < from) {
return false;
}
final Bytes keyBytes = Bytes.wrap(
TimeFirstWindowKeySchema.extractStoreKeyBytes(bytes.get()));
if ((binaryKeyFrom == null || keyBytes.compareTo(binaryKeyFrom) >= 0)
&& (binaryKeyTo == null || keyBytes.compareTo(binaryKeyTo) <= 0)
&& time >= from && time <= to) {
return true;
}
iterator.next();
}
return false;
};
}
@Override
public <S extends Segment> List<S> segmentsToSearch(final Segments<S> segments,
final long from,
final long to,
final boolean forward) {
return segments.segments(from, to, forward);
}
static byte[] extractStoreKeyBytes(final byte[] binaryKey) {
final byte[] bytes = new byte[binaryKey.length - TIMESTAMP_SIZE - SEQNUM_SIZE - PREFIX_SIZE];
System.arraycopy(binaryKey, TIMESTAMP_SIZE + PREFIX_SIZE, bytes, 0, bytes.length);
return bytes;
}
static long extractStoreTimestamp(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getLong(PREFIX_SIZE);
}
public static Bytes toStoreKeyBinary(final Windowed<Bytes> timeKey,
final int seqnum) {
return toStoreKeyBinary(timeKey.key().get(), timeKey.window().start(), seqnum);
}
public static <K> Windowed<K> fromStoreKey(final byte[] binaryKey,
final long windowSize,
final Deserializer<K> deserializer,
final String topic) {
final K key = deserializer.deserialize(topic, extractStoreKeyBytes(binaryKey));
final Window window = extractStoreWindow(binaryKey, windowSize);
return new Windowed<>(key, window);
}
public static <K> Bytes toStoreKeyBinary(final Windowed<K> timeKey,
final int seqnum,
final StateSerdes<K, ?> serdes) {
final byte[] serializedKey = serdes.rawKey(timeKey.key());
return toStoreKeyBinary(serializedKey, timeKey.window().start(), seqnum);
}
public static <K> Bytes toStoreKeyBinary(final K key,
final long timestamp,
final int seqnum,
final StateSerdes<K, ?> serdes) {
final byte[] serializedKey = serdes.rawKey(key);
return toStoreKeyBinary(serializedKey, timestamp, seqnum);
}
// for store serdes
public static Bytes toStoreKeyBinary(final Bytes key,
final long timestamp,
final int seqnum) {
return toStoreKeyBinary(key.get(), timestamp, seqnum);
}
static Bytes toStoreKeyBinary(final byte[] serializedKey,
final long timestamp,
final int seqnum) {
final ByteBuffer buf = ByteBuffer.allocate(
PREFIX_SIZE + TIMESTAMP_SIZE + serializedKey.length + SEQNUM_SIZE);
buf.put(TIME_FIRST_PREFIX);
buf.putLong(timestamp);
buf.put(serializedKey);
buf.putInt(seqnum);
return Bytes.wrap(buf.array());
}
public static Windowed<Bytes> fromStoreBytesKey(final byte[] binaryKey,
final long windowSize) {
final Bytes key = Bytes.wrap(extractStoreKeyBytes(binaryKey));
final Window window = extractStoreWindow(binaryKey, windowSize);
return new Windowed<>(key, window);
}
static Window extractStoreWindow(final byte[] binaryKey,
final long windowSize) {
final long start = extractStoreTimestamp(binaryKey);
return timeWindowForSize(start, windowSize);
}
static int extractStoreSequence(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getInt(binaryKey.length - SEQNUM_SIZE);
}
public static byte[] fromNonPrefixWindowKey(final byte[] binaryKey) {
final ByteBuffer buffer = ByteBuffer.allocate(PREFIX_SIZE + binaryKey.length).put(TIME_FIRST_PREFIX);
// Put timestamp
buffer.put(binaryKey, binaryKey.length - SEQNUM_SIZE - TIMESTAMP_SIZE, TIMESTAMP_SIZE);
buffer.put(binaryKey, 0, binaryKey.length - SEQNUM_SIZE - TIMESTAMP_SIZE);
buffer.put(binaryKey, binaryKey.length - SEQNUM_SIZE, SEQNUM_SIZE);
return buffer.array();
}
}
public static class KeyFirstWindowKeySchema implements KeySchema {
@Override
public Bytes upperRange(final Bytes key, final long to) {
final Bytes noPrefixBytes = new WindowKeySchema().upperRange(key, to);
return wrapPrefix(noPrefixBytes, true);
}
@Override
public Bytes lowerRange(final Bytes key, final long from) {
final Bytes noPrefixBytes = new WindowKeySchema().lowerRange(key, from);
// Wrap at least prefix even key is null
return wrapPrefix(noPrefixBytes, false);
}
@Override
public Bytes lowerRangeFixedSize(final Bytes key, final long from) {
final Bytes noPrefixBytes = WindowKeySchema.toStoreKeyBinary(key, Math.max(0, from), 0);
return wrapPrefix(noPrefixBytes, false);
}
@Override
public Bytes upperRangeFixedSize(final Bytes key, final long to) {
final Bytes noPrefixBytes = WindowKeySchema.toStoreKeyBinary(key, to, Integer.MAX_VALUE);
return wrapPrefix(noPrefixBytes, true);
}
@Override
public long segmentTimestamp(final Bytes key) {
return extractStoreTimestamp(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 byte prefix = extractPrefix(bytes.get());
if (prefix != KEY_FIRST_PREFIX) {
return false;
}
final Bytes keyBytes = Bytes.wrap(KeyFirstWindowKeySchema.extractStoreKeyBytes(bytes.get()));
final long time = KeyFirstWindowKeySchema.extractStoreTimestamp(bytes.get());
if ((binaryKeyFrom == null || keyBytes.compareTo(binaryKeyFrom) >= 0)
&& (binaryKeyTo == null || keyBytes.compareTo(binaryKeyTo) <= 0)
&& time >= from
&& time <= to) {
return true;
}
iterator.next();
}
return false;
};
}
@Override
public <S extends Segment> List<S> segmentsToSearch(final Segments<S> segments,
final long from,
final long to,
final boolean forward) {
return segments.segments(from, to, forward);
}
public static <K> Bytes toStoreKeyBinary(final K key,
final long timestamp,
final int seqnum,
final StateSerdes<K, ?> serdes) {
final byte[] serializedKey = serdes.rawKey(key);
return toStoreKeyBinary(serializedKey, timestamp, seqnum);
}
public static Bytes toStoreKeyBinary(final Windowed<Bytes> timeKey,
final int seqnum) {
return toStoreKeyBinary(timeKey.key().get(), timeKey.window().start(), seqnum);
}
public static <K> Bytes toStoreKeyBinary(final Windowed<K> timeKey,
final int seqnum,
final StateSerdes<K, ?> serdes) {
final byte[] serializedKey = serdes.rawKey(timeKey.key());
return toStoreKeyBinary(serializedKey, timeKey.window().start(), seqnum);
}
public static Bytes toStoreKeyBinary(final Bytes key,
final long timestamp,
final int seqnum) {
return toStoreKeyBinary(key.get(), timestamp, seqnum);
}
// package private for testing
public static Bytes toStoreKeyBinary(final byte[] serializedKey,
final long timestamp,
final int seqnum) {
final ByteBuffer buf = ByteBuffer.allocate(PREFIX_SIZE + serializedKey.length + TIMESTAMP_SIZE + SEQNUM_SIZE);
buf.put(KEY_FIRST_PREFIX);
buf.put(serializedKey);
buf.putLong(timestamp);
buf.putInt(seqnum);
return Bytes.wrap(buf.array());
}
static byte[] extractStoreKeyBytes(final byte[] binaryKey) {
final byte[] bytes = new byte[binaryKey.length - TIMESTAMP_SIZE - SEQNUM_SIZE - PREFIX_SIZE];
System.arraycopy(binaryKey, PREFIX_SIZE, bytes, 0, bytes.length);
return bytes;
}
public static Windowed<Bytes> fromStoreBytesKey(final byte[] binaryKey,
final long windowSize) {
final Bytes key = Bytes.wrap(extractStoreKeyBytes(binaryKey));
final Window window = extractStoreWindow(binaryKey, windowSize);
return new Windowed<>(key, window);
}
static long extractStoreTimestamp(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getLong(binaryKey.length - TIMESTAMP_SIZE - SEQNUM_SIZE);
}
static int extractStoreSequence(final byte[] binaryKey) {
return ByteBuffer.wrap(binaryKey).getInt(binaryKey.length - SEQNUM_SIZE);
}
static Window extractStoreWindow(final byte[] binaryKey,
final long windowSize) {
final long start = KeyFirstWindowKeySchema.extractStoreTimestamp(binaryKey);
return timeWindowForSize(start, windowSize);
}
public static <K> Windowed<K> fromStoreKey(final byte[] binaryKey,
final long windowSize,
final Deserializer<K> deserializer,
final String topic) {
final K key = deserializer.deserialize(topic, extractStoreKeyBytes(binaryKey));
final Window window = extractStoreWindow(binaryKey, windowSize);
return new Windowed<>(key, window);
}
private static Bytes wrapPrefix(final Bytes noPrefixKey, final boolean upperRange) {
// Need to scan from prefix even key is null
if (noPrefixKey == null) {
final byte prefix = upperRange ? KEY_FIRST_PREFIX + 1 : KEY_FIRST_PREFIX;
final byte[] ret = ByteBuffer.allocate(PREFIX_SIZE)
.put(prefix)
.array();
return Bytes.wrap(ret);
}
final byte[] ret = ByteBuffer.allocate(PREFIX_SIZE + noPrefixKey.get().length)
.put(KEY_FIRST_PREFIX)
.put(noPrefixKey.get())
.array();
return Bytes.wrap(ret);
}
public static byte[] fromNonPrefixWindowKey(final byte[] binaryKey) {
return wrapPrefix(Bytes.wrap(binaryKey), false).get();
}
}
}
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