swamirishi commented on code in PR #4678: URL: https://github.com/apache/ozone/pull/4678#discussion_r1223564028
########## hadoop-ozone/ozone-manager/src/test/java/org/apache/hadoop/ozone/om/snapshot/SnapshotTestUtils.java: ########## @@ -0,0 +1,190 @@ +/* + * 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 + * <p> + * http://www.apache.org/licenses/LICENSE-2.0 + * <p> + * 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.hadoop.ozone.om.snapshot; + +import org.apache.hadoop.util.ClosableIterator; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.Iterator; +import java.util.Map; +import java.util.Optional; +import java.util.Set; + +/** + * Util classes for Snapshot Persistent DataStructures for tests. + */ +public class SnapshotTestUtils { + + /** + * Test CloseableIterator containing iterators. + */ + private static class DummyCloseableIterator<T> implements + ClosableIterator<T> { + private Iterator<T> iterator; + + DummyCloseableIterator(Iterator<T> iterator) { + this.iterator = iterator; + } + + @Override + public void close() { + + } + + @Override + public boolean hasNext() { + return this.iterator.hasNext(); + } + + @Override + public T next() { + return this.iterator.next(); + } + } + + /** + * HashMap based Persistent Map for testing. + * @param <K> + * @param <V> + */ + public static class HashPersistentMap<K, V> implements PersistentMap<K, V> { + + private Map<String, Map.Entry<K, V>> map; + + public HashPersistentMap(Map<K, V> map) { + this(); + map.entrySet().iterator().forEachRemaining(i -> + this.put(i.getKey(), i.getValue())); + } + + public HashPersistentMap() { + this.map = new HashMap<>(); + } + + private String getStringKey(K key) { + if (key.getClass().isArray()) { + Class<?> componentType = key.getClass().getComponentType(); + if (componentType == byte.class) { + return Arrays.toString((byte[])key); + } else if (componentType == int.class) { + return Arrays.toString((int[])key); + } else if (componentType == long.class) { + return Arrays.toString((long[])key); + } else if (componentType == float.class) { + return Arrays.toString((float[])key); + } else if (componentType == double.class) { + return Arrays.toString((double[])key); + } else if (componentType == char.class) { + return Arrays.toString((char[])key); + } else { + return Arrays.toString((Object[])key); + } + } + return key.toString(); + } + + @Override + public V get(K key) { + return Optional.ofNullable(this.map.get(getStringKey(key))) + .map(Map.Entry::getValue).orElse(null); + } + + @Override + public void put(K key, V value) { + this.map.put(getStringKey(key), new Map.Entry<K, V>() { + @Override + public K getKey() { + return key; + } + + @Override + public V getValue() { + return value; + } + + @Override + public V setValue(V v) { + return value; + } + }); + } + + @Override + public void remove(K key) { + this.map.remove(getStringKey(key)); + } + + @Override + public ClosableIterator<Map.Entry<K, V>> iterator() { + return new DummyCloseableIterator<>( + this.map.values().stream().iterator()); + } + } + + /** + * HashMap based Persistent Set for testing. + * @param <K> + */ + public static class HashPersistentSet<K> implements PersistentSet<K> { + private HashPersistentMap<K, Void> map; + + public HashPersistentSet(Set<K> map) { + this(); + map.iterator().forEachRemaining(this::add); + } + + public HashPersistentSet() { + this.map = new HashPersistentMap(); + } + + @Override + public void add(K entry) { + map.put(entry, null); + } + + @Override + public ClosableIterator<K> iterator() { + return new DummyCloseableIterator<>(map.map.values().stream() + .map(Map.Entry::getKey).iterator()); + } + } + + /** + * ArrayList based Persistent List for testing. + * @param <K> + */ + public static class ArrayPersistentList<K> extends ArrayList<K> + implements PersistentList<K> { + + @Override + public boolean addAll(PersistentList<K> from) { + boolean[] ret = {true}; Review Comment: changed it. -- This is an automated message from the Apache Git Service. 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