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Update PolarisEclipseLinkStore to work with more databases (#247)
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...n/java/org/apache/polaris/extension/persistence/impl/eclipselink/PolarisSequenceUtil.java
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| /* | ||
| * 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.polaris.extension.persistence.impl.eclipselink; | ||
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|
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| import jakarta.persistence.*; | ||
| import java.util.Optional; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
| import org.apache.polaris.core.persistence.models.ModelSequenceId; | ||
| import org.eclipse.persistence.internal.jpa.EntityManagerImpl; | ||
| import org.eclipse.persistence.platform.database.DatabasePlatform; | ||
| import org.eclipse.persistence.platform.database.PostgreSQLPlatform; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
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| /** | ||
| * Used to generate sequence IDs for Polaris entities. If the legacy `POLARIS_SEQ` generator is | ||
| * available it will be used then cleaned up. In all other cases the `POLARIS_SEQUENCE` table is | ||
| * used directly. | ||
| */ | ||
| class PolarisSequenceUtil { | ||
| private static final Logger LOGGER = LoggerFactory.getLogger(PolarisSequenceUtil.class); | ||
|
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| private static final AtomicBoolean initialized = new AtomicBoolean(false); | ||
|
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| private PolarisSequenceUtil() {} | ||
|
|
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| /* If `initialize` was never called, throw an exception */ | ||
| private static void throwIfNotInitialized() { | ||
| if (!initialized.get()) { | ||
| throw new IllegalStateException("Sequence util has not been initialized"); | ||
| } | ||
| } | ||
|
|
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| /* Get the database platform associated with the `EntityManager` */ | ||
| private static DatabasePlatform getDatabasePlatform(EntityManager session) { | ||
| EntityManagerImpl entityManagerImpl = session.unwrap(EntityManagerImpl.class); | ||
| return entityManagerImpl.getDatabaseSession().getPlatform(); | ||
| } | ||
|
|
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| private static void removeSequence(EntityManager session) { | ||
| LOGGER.info("Renaming legacy sequence `POLARIS_SEQ` to `POLARIS_SEQ_UNUSED`"); | ||
| String renameSequenceQuery = "ALTER SEQUENCE POLARIS_SEQ RENAME TO POLARIS_SEQ_UNUSED"; | ||
| session.createNativeQuery(renameSequenceQuery).executeUpdate(); | ||
| } | ||
|
|
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| /** | ||
| * Prepare the `PolarisSequenceUtil` to generate IDs. This may run a failing query, so it should | ||
| * be called for the first time outside the context of a transaction. This method should be called | ||
| * before any other methods. TODO: after a sufficient this can eventually be removed or altered | ||
| */ | ||
| public static void initialize(EntityManager session) { | ||
| // Trigger cleanup of the POLARIS_SEQ if it is present | ||
| DatabasePlatform databasePlatform = getDatabasePlatform(session); | ||
| if (!initialized.get()) { | ||
| if (databasePlatform instanceof PostgreSQLPlatform) { | ||
| Optional<Long> result = Optional.empty(); | ||
| LOGGER.info("Checking if the sequence POLARIS_SEQ exists"); | ||
| String checkSequenceQuery = | ||
| "SELECT COUNT(*) FROM information_schema.sequences WHERE sequence_name IN " | ||
| + "('polaris_seq', 'POLARIS_SEQ')"; | ||
| int sequenceExists = | ||
| ((Number) session.createNativeQuery(checkSequenceQuery).getSingleResult()).intValue(); | ||
|
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| if (sequenceExists > 0) { | ||
| LOGGER.info("POLARIS_SEQ exists, calling NEXTVAL"); | ||
| long queryResult = | ||
| (long) session.createNativeQuery("SELECT NEXTVAL('POLARIS_SEQ')").getSingleResult(); | ||
| result = Optional.of(queryResult); | ||
| } else { | ||
| LOGGER.info("POLARIS_SEQ does not exist, skipping NEXTVAL"); | ||
| } | ||
| result.ifPresent( | ||
| r -> { | ||
| ModelSequenceId modelSequenceId = new ModelSequenceId(); | ||
| modelSequenceId.setId(r); | ||
|
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| // Persist the new ID: | ||
| session.persist(modelSequenceId); | ||
| session.flush(); | ||
|
|
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| // Clean the sequence: | ||
| removeSequence(session); | ||
| }); | ||
| } | ||
| initialized.set(true); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Generates a new ID from `POLARIS_SEQUENCE` or `POLARIS_SEQ` depending on availability. | ||
| * `initialize` should be called before this method. | ||
| */ | ||
| public static Long getNewId(EntityManager session) { | ||
| throwIfNotInitialized(); | ||
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| ModelSequenceId modelSequenceId = new ModelSequenceId(); | ||
|
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| // Persist the new ID: | ||
| session.persist(modelSequenceId); | ||
| session.flush(); | ||
|
|
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| return modelSequenceId.getId(); | ||
| } | ||
| } |
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