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86
...keycloak/connections/jpa/updater/liquibase/lock/CustomLockDatabaseChangeLogGenerator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * Copyright 2016 Red Hat, Inc. and/or its affiliates | ||
| * and other contributors as indicated by the @author tags. | ||
| * | ||
| * Licensed 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. | ||
| */ | ||
|
|
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| package org.keycloak.connections.jpa.updater.liquibase.lock; | ||
|
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| import liquibase.database.Database; | ||
| import liquibase.database.core.DB2Database; | ||
| import liquibase.database.core.H2Database; | ||
| import liquibase.database.core.MSSQLDatabase; | ||
| import liquibase.database.core.MySQLDatabase; | ||
| import liquibase.database.core.OracleDatabase; | ||
| import liquibase.database.core.PostgresDatabase; | ||
| import liquibase.sql.Sql; | ||
| import liquibase.sql.UnparsedSql; | ||
| import liquibase.sqlgenerator.SqlGeneratorChain; | ||
| import liquibase.sqlgenerator.core.LockDatabaseChangeLogGenerator; | ||
| import liquibase.statement.core.LockDatabaseChangeLogStatement; | ||
| import org.jboss.logging.Logger; | ||
|
|
||
| /** | ||
| * We use "SELECT FOR UPDATE" pessimistic locking (Same algorithm like Hibernate LockMode.PESSIMISTIC_WRITE ) | ||
| * | ||
| * @author <a href="mailto:mposolda@redhat.com">Marek Posolda</a> | ||
| */ | ||
| public class CustomLockDatabaseChangeLogGenerator extends LockDatabaseChangeLogGenerator { | ||
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| private static final Logger logger = Logger.getLogger(CustomLockDatabaseChangeLogGenerator.class); | ||
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| @Override | ||
| public int getPriority() { | ||
| return super.getPriority() + 1; // Ensure bigger priority than LockDatabaseChangeLogGenerator | ||
| } | ||
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| @Override | ||
| public Sql[] generateSql(LockDatabaseChangeLogStatement statement, Database database, SqlGeneratorChain sqlGeneratorChain) { | ||
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| Sql selectForUpdateSql = generateSelectForUpdate(database); | ||
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| return new Sql[] { selectForUpdateSql }; | ||
| } | ||
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| private Sql generateSelectForUpdate(Database database) { | ||
| String catalog = database.getLiquibaseCatalogName(); | ||
| String schema = database.getLiquibaseSchemaName(); | ||
| String rawLockTableName = database.getDatabaseChangeLogLockTableName(); | ||
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| String lockTableName = database.escapeTableName(catalog, schema, rawLockTableName); | ||
| String idColumnName = database.escapeColumnName(catalog, schema, rawLockTableName, "ID"); | ||
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| String sqlBase = "SELECT " + idColumnName + " FROM " + lockTableName; | ||
| String sqlWhere = " WHERE " + idColumnName + "=1"; | ||
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| String sql; | ||
| if (database instanceof MySQLDatabase || database instanceof PostgresDatabase || database instanceof H2Database || | ||
| database instanceof OracleDatabase) { | ||
| sql = sqlBase + sqlWhere + " FOR UPDATE"; | ||
| } else if (database instanceof MSSQLDatabase) { | ||
| sql = sqlBase + " WITH (UPDLOCK, ROWLOCK)" + sqlWhere; | ||
| } else if (database instanceof DB2Database) { | ||
| sql = sqlBase + sqlWhere + " FOR READ ONLY WITH RS USE AND KEEP UPDATE LOCKS"; | ||
| } else { | ||
| sql = sqlBase + sqlWhere; | ||
| logger.warnf("No direct support for database %s . Database lock may not work correctly", database.getClass().getName()); | ||
| } | ||
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| logger.debugf("SQL command for pessimistic lock: %s", sql); | ||
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| return new UnparsedSql(sql); | ||
| } | ||
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| } |
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