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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.dinky.shaded.paimon.fs;

import org.dinky.shaded.paimon.catalog.CatalogContext;
import org.dinky.shaded.paimon.options.Options;

import java.io.IOException;

/**
 * A {@link FileIO} for plugin jar. {@link FileIO} is serializable, so plugin FileIO should be
 * transient.
 */
public abstract class PluginFileIO implements FileIO {

    private static final long serialVersionUID = 1L;

    protected Options options;

    private transient volatile FileIO lazyFileIO;

    @Override
    public void configure(CatalogContext context) {
        // Do not get Hadoop Configuration in CatalogOptions
        // The class is in different classloader from pluginClassLoader!
        this.options = context.options();
    }

    @Override
    public SeekableInputStream newInputStream(Path path) throws IOException {
        return wrap(() -> fileIO(path).newInputStream(path));
    }

    @Override
    public PositionOutputStream newOutputStream(Path path, boolean overwrite) throws IOException {
        return wrap(() -> fileIO(path).newOutputStream(path, overwrite));
    }

    @Override
    public FileStatus getFileStatus(Path path) throws IOException {
        return wrap(() -> fileIO(path).getFileStatus(path));
    }

    @Override
    public FileStatus[] listStatus(Path path) throws IOException {
        return wrap(() -> fileIO(path).listStatus(path));
    }

    @Override
    public boolean exists(Path path) throws IOException {
        return wrap(() -> fileIO(path).exists(path));
    }

    @Override
    public boolean delete(Path path, boolean recursive) throws IOException {
        return wrap(() -> fileIO(path).delete(path, recursive));
    }

    @Override
    public boolean mkdirs(Path path) throws IOException {
        return wrap(() -> fileIO(path).mkdirs(path));
    }

    @Override
    public boolean rename(Path src, Path dst) throws IOException {
        return wrap(() -> fileIO(src).rename(src, dst));
    }

    private FileIO fileIO(Path path) throws IOException {
        if (lazyFileIO == null) {
            synchronized (this) {
                if (lazyFileIO == null) {
                    lazyFileIO = wrap(() -> createFileIO(path));
                }
            }
        }
        return lazyFileIO;
    }

    protected abstract FileIO createFileIO(Path path);

    protected abstract ClassLoader pluginClassLoader();

    private  T wrap(Func func) throws IOException {
        ClassLoader cl = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(pluginClassLoader());
            return func.apply();
        } finally {
            Thread.currentThread().setContextClassLoader(cl);
        }
    }

    /** Apply function with wrapping classloader. */
    @FunctionalInterface
    protected interface Func {
        T apply() throws IOException;
    }
}