szehon-ho commented on code in PR #8755: URL: https://github.com/apache/iceberg/pull/8755#discussion_r1434014371
########## data/src/main/java/org/apache/iceberg/data/BaseDeleteLoader.java: ########## @@ -0,0 +1,260 @@ +/* + * 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.iceberg.data; + +import java.io.IOException; +import java.io.UncheckedIOException; +import java.util.Queue; +import java.util.concurrent.ConcurrentLinkedQueue; +import java.util.concurrent.ExecutorService; +import java.util.function.Function; +import java.util.function.Supplier; +import org.apache.iceberg.DeleteFile; +import org.apache.iceberg.FileFormat; +import org.apache.iceberg.MetadataColumns; +import org.apache.iceberg.Schema; +import org.apache.iceberg.StructLike; +import org.apache.iceberg.avro.Avro; +import org.apache.iceberg.data.avro.DataReader; +import org.apache.iceberg.data.orc.GenericOrcReader; +import org.apache.iceberg.data.parquet.GenericParquetReaders; +import org.apache.iceberg.deletes.Deletes; +import org.apache.iceberg.deletes.PositionDeleteIndex; +import org.apache.iceberg.deletes.PositionDeleteIndexUtil; +import org.apache.iceberg.expressions.Expression; +import org.apache.iceberg.expressions.Expressions; +import org.apache.iceberg.io.CloseableIterable; +import org.apache.iceberg.io.DeleteSchemaUtil; +import org.apache.iceberg.io.InputFile; +import org.apache.iceberg.orc.ORC; +import org.apache.iceberg.orc.OrcRowReader; +import org.apache.iceberg.parquet.Parquet; +import org.apache.iceberg.parquet.ParquetValueReader; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.Iterables; +import org.apache.iceberg.relocated.com.google.common.math.LongMath; +import org.apache.iceberg.types.TypeUtil; +import org.apache.iceberg.util.CharSequenceMap; +import org.apache.iceberg.util.StructLikeSet; +import org.apache.iceberg.util.Tasks; +import org.apache.iceberg.util.ThreadPools; +import org.apache.orc.TypeDescription; +import org.apache.parquet.schema.MessageType; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +public class BaseDeleteLoader implements DeleteLoader { + + private static final Logger LOG = LoggerFactory.getLogger(BaseDeleteLoader.class); + private static final Schema POS_DELETE_SCHEMA = DeleteSchemaUtil.pathPosSchema(); + + private final Function<DeleteFile, InputFile> loadInputFile; + private final ExecutorService workerPool; + + public BaseDeleteLoader(Function<DeleteFile, InputFile> loadInputFile) { + this(loadInputFile, ThreadPools.getDeleteWorkerPool()); + } + + public BaseDeleteLoader( + Function<DeleteFile, InputFile> loadInputFile, ExecutorService workerPool) { + this.loadInputFile = loadInputFile; + this.workerPool = workerPool; + } + + /** + * Checks if the given number of bytes can be cached. + * + * <p>Implementations should override this method if they support caching. It is also recommended + * to use the provided size as a guideline to decide whether the value is eligible for caching. + * For instance, it may be beneficial to discard values that are too large to optimize the cache + * performance and utilization. + */ + protected boolean canCache(long size) { + return false; + } + + /** + * Gets the cached value for the key or populates the cache with a new mapping. + * + * <p>If the value for the specified key is in the cache, it should be returned. If the value is + * not in the cache, implementations should compute the value using the provided supplier, cache + * it, and then return it. + * + * <p>This method will be called only if {@link #canCache(long)} returned true. + */ + protected <V> V get(String key, Supplier<V> valueSupplier, long valueSize) { Review Comment: get() is a bit confusing, can we call it getOrLoad (like on the calling method), or maybe better computeIfAbsent()? -- This is an automated message from the Apache Git Service. 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