InformixTable.java

/*-
 * ========================LICENSE_START=================================
 * flyway-database-informix
 * ========================================================================
 * Copyright (C) 2010 - 2026 Red Gate Software Ltd
 * ========================================================================
 * 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.
 * =========================LICENSE_END==================================
 */
package org.flywaydb.database.informix;

import lombok.CustomLog;
import org.flywaydb.core.internal.database.base.Table;
import org.flywaydb.core.internal.jdbc.JdbcTemplate;

import java.sql.SQLException;

@CustomLog
public class InformixTable extends Table<InformixDatabase, InformixSchema> {
    /**
     * Creates a new Informix table.
     *
     * @param jdbcTemplate The Jdbc Template for communicating with the DB.
     * @param database The database-specific support.
     * @param schema The schema this table lives in.
     * @param name The name of the table.
     */
    InformixTable(JdbcTemplate jdbcTemplate, InformixDatabase database, InformixSchema schema, String name) {
        super(jdbcTemplate, database, schema, name);
    }

    private static final int MAX_RETRIES = 10;
    private static final int RETRY_DELAY_MS = 1000;

    @Override
    protected void doDrop() throws SQLException {
        for (int attempt = 0; attempt <= MAX_RETRIES; attempt++) {
            try {
                jdbcTemplate.execute("DROP TABLE " + name);
                return;
            } catch (SQLException e) {
                if (attempt >= MAX_RETRIES || !isRetryableFileLockError(e)) {
                    throw e;
                }
                LOG.warn("Retrying DROP TABLE " + name + " due to ISAM file lock (attempt " + (attempt + 1) + "): " + e.getMessage());
                try {
                    Thread.sleep(RETRY_DELAY_MS);
                } catch (InterruptedException ie) {
                    Thread.currentThread().interrupt();
                    throw e;
                }
            }
        }
    }

    private static boolean isRetryableFileLockError(SQLException e) {
        Throwable t = e;
        while (t != null) {
            String message = t.getMessage();
            if (message != null && message.contains("file is locked")) {
                return true;
            }
            t = t.getCause();
        }
        return false;
    }

    @Override
    protected boolean doExists() throws SQLException {
        return exists(null, schema, name);
    }

    @Override
    protected void doLock() throws SQLException {
        jdbcTemplate.update("lock table " + this + " in exclusive mode");
    }

    @Override
    public String toString() {
        return name;
    }
}