seatunnel-core/seatunnel-core-flink-sql/src/main/java/org/apache/seatunnel/core/sql/classloader/CustomClassLoader.java

/*
 * 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.seatunnel.core.sql.classloader;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Path;

// TODO: maybe a unified plugin-style discovery mechanism is better.
public class CustomClassLoader extends URLClassLoader {

    private static final Logger LOGGER = LoggerFactory.getLogger(CustomClassLoader.class);

    public CustomClassLoader() {
        super(new URL[0]);
    }

    /*
     * If the table declared in 'create table' with connector 'xxx' and the table is not referenced in the job, namely,
     * used in the 'insert into' statement, the connector 'xxx' will not be needed by Flink.
     * So it might be ok fail to load it. If it's needed, we can see the error in Flink logs.
     *
     * Refer https://github.com/apache/incubator-seatunnel/pull/1850
     */
    public void addJar(Path jarPath) {
        try {
            this.addURL(jarPath.toUri().toURL());
        } catch (MalformedURLException e) {
            LOGGER.error("Failed to add jar to classloader. Jar: {}", jarPath, e);
        }
    }
}