denis-chudov commented on code in PR #2115: URL: https://github.com/apache/ignite-3/pull/2115#discussion_r1211358362
########## modules/affinity/src/main/java/org/apache/ignite/internal/affinity/Assignments.java: ########## @@ -0,0 +1,228 @@ +/* + * 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.ignite.internal.affinity; + +import static org.apache.ignite.internal.affinity.Assignment.forLearner; +import static org.apache.ignite.internal.affinity.Assignment.forPeer; + +import java.nio.ByteBuffer; +import java.nio.charset.StandardCharsets; +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashSet; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.function.Function; + +/** + * Represents affinity assignments. + */ +public class Assignments { + private final List<Set<Assignment>> assignments; + + public Assignments(List<Set<Assignment>> assignments) { + this.assignments = assignments; + } + + public List<Set<Assignment>> assignments() { + return assignments; + } + + /** + * Partitions count. + * + * @return Partitions count. + */ + public int size() { + return assignments.size(); + } + + /** + * Gets an assignments for the given partition. + * + * @param part Partition. + * @return Assignments for the given partition. + */ + public Set<Assignment> get(int part) { + return assignments.get(part); + } + + /** + * Sets an assignment for the given partition. + * + * @param part Partition. + * @param assignment Assignments for the given partition. + */ + public void set(int part, Set<Assignment> assignment) { + assignments.set(part, assignment); + } + + /** + * Bytes representation of the assignments. + * + * @return Bytes representation of the assignments. + */ + public byte[] bytes() { + Map<String, Integer> consistentIds = new LinkedHashMap<>(); + + int idx = 0; + for (Set<Assignment> assignmentSet : assignments) { + for (Assignment a : assignmentSet) { + if (consistentIds.putIfAbsent(a.consistentId(), idx) == null) { + idx++; + } + } + } + + byte[] consistentIdsBytes = collectionToBytes(consistentIds.keySet(), String::getBytes); + + byte[] assignmentsBytes = collectionToBytes( + assignments, + set -> collectionToBytes(set, a -> assignmentToBytes(a, consistentIds::get)) + ); + + ByteBuffer buf = ByteBuffer.allocate(Integer.BYTES * 2 + consistentIdsBytes.length + assignmentsBytes.length); + + buf.putInt(consistentIdsBytes.length); + buf.put(consistentIdsBytes); + buf.putInt(assignmentsBytes.length); + buf.put(assignmentsBytes); + + return buf.array(); + } + + /** + * Creates {@link Assignments} from the given byte array. + * + * @param bytes Byte array representation of the assignments. + * @return Assignments. + */ + public static Assignments fromBytes(byte[] bytes) { + ByteBuffer buf = ByteBuffer.wrap(bytes); + + int consistentIdsBytesLength = buf.getInt(); + byte[] consistentIdsBytes = new byte[consistentIdsBytesLength]; + buf.get(consistentIdsBytes); + + int assignmentsBytesLength = buf.getInt(); + byte[] assignmentsBytes = new byte[assignmentsBytesLength]; + buf.get(assignmentsBytes); + + List<String> consistentIds = bytesToList(consistentIdsBytes, b -> new String(b, StandardCharsets.UTF_8)); + + List<Set<Assignment>> assignments = bytesToList( + assignmentsBytes, + b -> new HashSet<>(bytesToList(b, ab -> bytesToAssignment(ab, consistentIds::get))) + ); + + return new Assignments(assignments); + } + + /** + * Serializes collection to bytes. + * + * @param collection Collection. + * @param transform Tranform function for the collection element. + * @return Byte array. + */ + private <T> byte[] collectionToBytes(Collection<T> collection, Function<T, byte[]> transform) { + int bytesObjects = 0; + List<byte[]> objects = new ArrayList<>(); + + for (T o : collection) { + byte[] b = transform.apply(o); + objects.add(b); + bytesObjects += b.length; + } + + bytesObjects += Short.BYTES * (objects.size() + 1); + + ByteBuffer buf = ByteBuffer.allocate(bytesObjects); + + buf.putShort((short) objects.size()); + + for (byte[] o : objects) { + buf.putShort((short) o.length); + buf.put(o); + } + + return buf.array(); + } + + /** + * Deserializes the list from byte array. + * + * @param bytes Byte array. + * @param transform Transform function to create list element. + * @return List. + */ + private static <T> List<T> bytesToList(byte[] bytes, Function<byte[], T> transform) { + ByteBuffer buf = ByteBuffer.wrap(bytes); + + short length = buf.getShort(); + assert length >= 0 : "Negative collection size: " + length; + + List<T> result = new ArrayList<>(length); + + for (int i = 0; i < length; i++) { + short size = buf.getShort(); + assert size >= 0 : "Negative object size: " + size + ", index=" + i; + byte[] arr = new byte[size]; + buf.get(arr); + result.add(transform.apply(arr)); + } + + return result; + } + + private static byte[] assignmentToBytes(Assignment assignment, Function<String, Integer> consistentIdToIndex) { + ByteBuffer buf = ByteBuffer.allocate(Integer.BYTES + Byte.BYTES); + buf.putInt(consistentIdToIndex.apply(assignment.consistentId())); + buf.put((byte) (assignment.isPeer() ? 1 : 0)); + return buf.array(); + } + + private static Assignment bytesToAssignment(byte[] bytes, Function<Integer, String> indexToConsistentId) { + ByteBuffer buf = ByteBuffer.wrap(bytes); + int index = buf.getInt(); + boolean isPeer = buf.get() == 1; + String consistentId = indexToConsistentId.apply(index); + return isPeer ? forPeer(consistentId) : forLearner(consistentId); + } + + @Override + public boolean equals(Object o) { + if (this == o) { + return true; + } + if (o == null || getClass() != o.getClass()) { + return false; + } + + Assignments that = (Assignments) o; + + return assignments != null ? assignments.equals(that.assignments) : that.assignments == null; Review Comment: It can't. 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