org.apache.flink.table.filesystem.SerializationSchemaAdapter Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of flink-table-runtime-blink_2.12 Show documentation

This module contains classes that are required by a task manager for execution of table programs. The content of this module is work-in-progress. It will replace the runtime classes contained in flink-table-planner once it is stable. See FLINK-11439 and FLIP-32 for more details.

The newest version!

/*
 * 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.flink.table.filesystem;

import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.serialization.Encoder;
import org.apache.flink.api.common.serialization.SerializationSchema;
import org.apache.flink.metrics.MetricGroup;
import org.apache.flink.table.data.RowData;
import org.apache.flink.util.UserCodeClassLoader;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.StandardCharsets;

/** Adapter to turn a {@link SerializationSchema} into a {@link Encoder}. */
@Internal
public class SerializationSchemaAdapter implements Encoder {

    private static final long serialVersionUID = 1L;

    static final byte LINE_DELIMITER = "\n".getBytes(StandardCharsets.UTF_8)[0];

    private final SerializationSchema serializationSchema;

    private transient boolean open;

    public SerializationSchemaAdapter(SerializationSchema serializationSchema) {
        this.serializationSchema = serializationSchema;
    }

    @Override
    public void encode(RowData element, OutputStream stream) throws IOException {
        checkOpened();
        stream.write(serializationSchema.serialize(element));
        stream.write(LINE_DELIMITER);
    }

    private void checkOpened() throws IOException {
        if (!open) {
            try {
                serializationSchema.open(
                        new SerializationSchema.InitializationContext() {
                            @Override
                            public MetricGroup getMetricGroup() {
                                throw new UnsupportedOperationException(
                                        "MetricGroup is unsupported in BulkFormat.");
                            }

                            @Override
                            public UserCodeClassLoader getUserCodeClassLoader() {
                                return (UserCodeClassLoader)
                                        Thread.currentThread().getContextClassLoader();
                            }
                        });
            } catch (Exception e) {
                throw new IOException(e);
            }
            open = true;
        }
    }
}