| /* |
| * 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.db.tries; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| import java.util.Random; |
| import java.util.SortedMap; |
| import java.util.TreeMap; |
| |
| import org.junit.Test; |
| |
| import org.apache.cassandra.utils.bytecomparable.ByteComparable; |
| |
| import static org.apache.cassandra.db.tries.InMemoryTrieTestBase.*; |
| |
| public class MergeTrieTest |
| { |
| private static final int COUNT = 15000; |
| Random rand = new Random(); |
| |
| @Test |
| public void testDirect() |
| { |
| ByteComparable[] src1 = generateKeys(rand, COUNT); |
| ByteComparable[] src2 = generateKeys(rand, COUNT); |
| SortedMap<ByteComparable, ByteBuffer> content1 = new TreeMap<>((bytes1, bytes2) -> ByteComparable.compare(bytes1, bytes2, VERSION)); |
| SortedMap<ByteComparable, ByteBuffer> content2 = new TreeMap<>((bytes1, bytes2) -> ByteComparable.compare(bytes1, bytes2, VERSION)); |
| |
| InMemoryTrie<ByteBuffer> trie1 = makeInMemoryTrie(src1, content1, true); |
| InMemoryTrie<ByteBuffer> trie2 = makeInMemoryTrie(src2, content2, true); |
| |
| content1.putAll(content2); |
| Trie<ByteBuffer> union = trie1.mergeWith(trie2, (x, y) -> x); |
| |
| assertSameContent(union, content1); |
| } |
| |
| @Test |
| public void testWithDuplicates() |
| { |
| ByteComparable[] src1 = generateKeys(rand, COUNT); |
| ByteComparable[] src2 = generateKeys(rand, COUNT); |
| SortedMap<ByteComparable, ByteBuffer> content1 = new TreeMap<>((bytes1, bytes2) -> ByteComparable.compare(bytes1, bytes2, VERSION)); |
| SortedMap<ByteComparable, ByteBuffer> content2 = new TreeMap<>((bytes1, bytes2) -> ByteComparable.compare(bytes1, bytes2, VERSION)); |
| |
| InMemoryTrie<ByteBuffer> trie1 = makeInMemoryTrie(src1, content1, true); |
| InMemoryTrie<ByteBuffer> trie2 = makeInMemoryTrie(src2, content2, true); |
| |
| addToInMemoryTrie(generateKeys(new Random(5), COUNT), content1, trie1, true); |
| addToInMemoryTrie(generateKeys(new Random(5), COUNT), content2, trie2, true); |
| |
| content1.putAll(content2); |
| Trie<ByteBuffer> union = trie1.mergeWith(trie2, (x, y) -> y); |
| |
| assertSameContent(union, content1); |
| } |
| |
| @Test |
| public void testDistinct() |
| { |
| ByteComparable[] src1 = generateKeys(rand, COUNT); |
| SortedMap<ByteComparable, ByteBuffer> content1 = new TreeMap<>((bytes1, bytes2) -> ByteComparable.compare(bytes1, bytes2, VERSION)); |
| InMemoryTrie<ByteBuffer> trie1 = makeInMemoryTrie(src1, content1, true); |
| |
| ByteComparable[] src2 = generateKeys(rand, COUNT); |
| src2 = removeDuplicates(src2, content1); |
| SortedMap<ByteComparable, ByteBuffer> content2 = new TreeMap<>((bytes1, bytes2) -> ByteComparable.compare(bytes1, bytes2, VERSION)); |
| InMemoryTrie<ByteBuffer> trie2 = makeInMemoryTrie(src2, content2, true); |
| |
| content1.putAll(content2); |
| Trie<ByteBuffer> union = new MergeTrie.Distinct<>(trie1, trie2); |
| |
| assertSameContent(union, content1); |
| } |
| |
| static ByteComparable[] removeDuplicates(ByteComparable[] keys, SortedMap<ByteComparable, ByteBuffer> content1) |
| { |
| return Arrays.stream(keys) |
| .filter(key -> !content1.containsKey(key)) |
| .toArray(ByteComparable[]::new); |
| } |
| } |