InvisibleProgrammer commented on code in PR #5606: URL: https://github.com/apache/hive/pull/5606#discussion_r1951608656
########## standalone-metastore/metastore-catalog/src/main/java/org/apache/iceberg/HiveCachingCatalog.java: ########## @@ -0,0 +1,333 @@ +/* + * 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; + +import com.github.benmanes.caffeine.cache.Cache; +import com.github.benmanes.caffeine.cache.Caffeine; +import com.github.benmanes.caffeine.cache.RemovalCause; +import com.github.benmanes.caffeine.cache.RemovalListener; +import com.github.benmanes.caffeine.cache.Ticker; +import java.time.Duration; +import java.util.List; +import java.util.Locale; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.atomic.AtomicBoolean; +import org.apache.iceberg.catalog.Catalog; +import org.apache.iceberg.catalog.Namespace; +import org.apache.iceberg.catalog.SupportsNamespaces; +import org.apache.iceberg.catalog.TableIdentifier; +import org.apache.iceberg.exceptions.AlreadyExistsException; +import org.apache.iceberg.exceptions.NamespaceNotEmptyException; +import org.apache.iceberg.exceptions.NoSuchNamespaceException; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + + + +/** + * Class that wraps an Iceberg Catalog to cache tables. + * Initial code in: + * https://github.com/apache/iceberg/blob/1.3.x/core/src/main/java/org/apache/iceberg/CachingCatalog.java + * Main difference is the SupportsNamespace. + * + * <p>See {@link CatalogProperties#CACHE_EXPIRATION_INTERVAL_MS} for more details regarding special + * values for {@code expirationIntervalMillis}. + * @param <CATALOG> the catalog class + */ +public class HiveCachingCatalog<CATALOG extends Catalog & SupportsNamespaces> implements Catalog, SupportsNamespaces { Review Comment: @aturoczy >Personally I do not like even the original implementation in the iceberg lib. The original one is pretty much like a quick and dirty code. For a quick solution is fine. We can argue about to inherit and override the methods, but still the original structure is not as good. I would say if in the long term we change it to our style maybe it is better to copy it. From OOP perspective sure the inherit is nicer. That sword has two edges: what happens when Iceberg changes the code in the original implementation? Who ensures that the future code change in the Iceberg repository will be synced in the Hive Metastore? When we extend the original class, we will be automatically get a compile error when an interface changes. And also, we will know how many methods containing Hive specific code: as they will be overwritten. If we just copy-paste the original code we have only hope. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org
