reswqa commented on code in PR #24398: URL: https://github.com/apache/flink/pull/24398#discussion_r1521091212
########## flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/sortpartition/FixedLengthByteKeyAndValueComparator.java: ########## @@ -0,0 +1,176 @@ +/* + * 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.flink.streaming.api.operators.sortpartition; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.api.common.typeutils.TypeComparator; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.core.memory.DataInputView; +import org.apache.flink.core.memory.DataOutputView; +import org.apache.flink.core.memory.MemorySegment; + +import java.io.IOException; +import java.util.Arrays; + +/** + * The {@link FixedLengthByteKeyAndValueComparator} is used by {@link KeyedSortPartitionOperator} to + * compare records according to both the record key and record value. The length of record key must + * be fixed and will be initialized when the {@link FixedLengthByteKeyAndValueComparator} is + * created. + */ +@Internal +public class FixedLengthByteKeyAndValueComparator<INPUT> + extends TypeComparator<Tuple2<byte[], INPUT>> { + + private final int serializedKeyLength; + + private final TypeComparator<INPUT> valueComparator; + + private byte[] keyReference; + + private INPUT valueReference; + + FixedLengthByteKeyAndValueComparator( + int serializedKeyLength, TypeComparator<INPUT> valueComparator) { + this.serializedKeyLength = serializedKeyLength; + this.valueComparator = valueComparator; + } + + @Override + public int hash(Tuple2<byte[], INPUT> record) { + return record.hashCode(); + } + + @Override + public void setReference(Tuple2<byte[], INPUT> toCompare) { + this.keyReference = toCompare.f0; + this.valueReference = toCompare.f1; + } + + @Override + public boolean equalToReference(Tuple2<byte[], INPUT> candidate) { + return Arrays.equals(keyReference, candidate.f0) && valueReference == candidate.f1; + } + + @Override + public int compareToReference(TypeComparator<Tuple2<byte[], INPUT>> referencedComparator) { + byte[] otherKey = + ((FixedLengthByteKeyAndValueComparator<INPUT>) referencedComparator).keyReference; + INPUT otherValue = + ((FixedLengthByteKeyAndValueComparator<INPUT>) referencedComparator).valueReference; + int keyCmp = compare(otherKey, this.keyReference); + if (keyCmp != 0) { + return keyCmp; + } + return valueComparator.compare(this.valueReference, otherValue); + } + + @Override + public int compare(Tuple2<byte[], INPUT> first, Tuple2<byte[], INPUT> second) { + int keyCmp = compare(first.f0, second.f0); + if (keyCmp != 0) { + return keyCmp; + } + return valueComparator.compare(first.f1, second.f1); + } + + private int compare(byte[] first, byte[] second) { + for (int i = 0; i < serializedKeyLength; i++) { + int cmp = Byte.compare(first[i], second[i]); + if (cmp != 0) { + return cmp < 0 ? -1 : 1; + } + } + return 0; + } + + @Override + public int compareSerialized(DataInputView firstSource, DataInputView secondSource) + throws IOException { + int minCount = serializedKeyLength; + while (minCount-- > 0) { + byte firstValue = firstSource.readByte(); + byte secondValue = secondSource.readByte(); + int cmp = Byte.compare(firstValue, secondValue); + if (cmp != 0) { + return cmp < 0 ? -1 : 1; + } + } + return valueComparator.compareSerialized(firstSource, secondSource); + } + + @Override + public boolean supportsNormalizedKey() { Review Comment: Thanks for the explanation. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
