frankgh commented on code in PR #45: URL: https://github.com/apache/cassandra-sidecar/pull/45#discussion_r1194174015
########## cassandra40/src/main/java/org/apache/cassandra/sidecar/cassandra40/TokenRangeReplicas.java: ########## @@ -0,0 +1,417 @@ +/* + * 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.cassandra.sidecar.cassandra40; + +import java.math.BigInteger; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Set; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import com.google.common.base.Objects; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.jetbrains.annotations.NotNull; + + +/** + * Representation of a token range and the corresponding mapping to replica-set hosts + */ +public class TokenRangeReplicas implements Comparable<TokenRangeReplicas> +{ + private final BigInteger start; + private final BigInteger end; + + private final Partitioner partitioner; + + private final Set<String> replicaSet; + + private static final Logger LOGGER = LoggerFactory.getLogger(TokenRangeReplicas.class); + + public TokenRangeReplicas(BigInteger start, BigInteger end, Partitioner partitioner, Set<String> replicaSet) + { + this.start = start; + this.end = end; + this.partitioner = partitioner; + this.replicaSet = replicaSet; + } + + + public BigInteger start() + { + return start; + } + + public BigInteger end() + { + return end; + } + + public Set<String> replicaSet() + { + return replicaSet; + } + + /** + * {@inheritDoc} + */ + @Override + public int compareTo(@NotNull TokenRangeReplicas other) + { + if (this.partitioner != other.partitioner) + throw new IllegalStateException("Token ranges being compared do not have the same partitioner"); + + // TODO + BigInteger maxValue = this.partitioner.maxToken; + if (this.start.compareTo(other.start) == 0) + { + if (this.end.equals(maxValue)) return 1; + else if (other.end.equals(maxValue)) return -1; + else return this.end.compareTo(other.end); + } + else return this.start.compareTo(other.start); + } + + /** + * {@inheritDoc} + */ + @Override + public boolean equals(Object o) + { + if (!(o instanceof TokenRangeReplicas)) + { + return false; + } + TokenRangeReplicas that = (TokenRangeReplicas) o; + return (this.start.equals(that.start) && this.end.equals(that.end) && this.partitioner == that.partitioner); + } + + /** + * {@inheritDoc} + */ + @Override + public int hashCode() + { + return Objects.hashCode(start, end, partitioner); + } + + private boolean isWrapAround() + { + return start.compareTo(end) >= 0; + } + + private boolean isSubsetOf(TokenRangeReplicas other) + { + if (this.partitioner != other.partitioner) + throw new IllegalStateException("Token ranges being compared do not have the same partitioner"); + + BigInteger maxValue = this.partitioner.maxToken; + if (this.start.compareTo(other.start) >= 0) + { + // TODO: + if (other.end.equals(maxValue)) return true; + if (this.end.equals(maxValue)) return false; + if (this.end.compareTo(other.end) <= 0) return true; + } + return false; + } + + /** + * For subset ranges, this is used to determine if a range is larger than the other by comparing start-end lengths + * If both ranges end at the min, we compare starting points to determine the result. + * When the left range is the only one ending at min, it is always the larger one since all subsequent ranges + * in the sorted range list have to be smaller. + * + * @param other the next range in the range list to compare + * @return true if "this" range is larger than the other + */ + private boolean isLarger(TokenRangeReplicas other) + { + if (this.partitioner != other.partitioner) + throw new IllegalStateException("Token ranges being compared do not have the same partitioner"); + + // If both ranges end at min, we compare start of ranges + if (this.end.equals(partitioner.maxToken) && other.end.equals(partitioner.maxToken)) + { + return this.start.compareTo(other.start) < 0; + } + + if (this.end.equals(partitioner.maxToken)) return true; + if (other.end.equals(partitioner.maxToken)) return false; + + return this.end.subtract(this.start).compareTo(other.end.subtract(other.start)) > 0; + } + + /** + * Determines intersection if the next range starts before the current range ends. + * When the current range ending at min, we determine intersection merely if the next range starts after the current + * since all subsequent ranges have to be subsets. + * + * @param other the range we are currently processing to check if "this" intersects it + * @return true if "this" range intersects the other + */ + private boolean intersects(TokenRangeReplicas other) + { + return (other.end.compareTo(partitioner.maxToken) == 0 && this.start.compareTo(other.start) > 0) || + this.start.compareTo(other.end) < 0; + } Review Comment: Adding this test and providing a fixed implementation -- This is an automated message from the Apache Git Service. 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