org.apache.flink.streaming.connectors.pulsar.internal.TopicSubscriptionSerializer Maven / Gradle / Ivy

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/*
 * 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.
 */

package org.apache.flink.streaming.connectors.pulsar.internal;

import org.apache.flink.api.common.typeutils.SimpleTypeSerializerSnapshot;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.TypeSerializerSnapshot;
import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

/**
 * TopicSubscription Serializer for flink state.
 */
public class TopicSubscriptionSerializer extends TypeSerializer {

    public static final TopicSubscriptionSerializer INSTANCE = new TopicSubscriptionSerializer();

    @Override
    public boolean isImmutableType() {
        return true;
    }

    @Override
    public TypeSerializer duplicate() {
        return this;
    }

    @Override
    public TopicSubscription createInstance() {
        return new TopicSubscription();
    }

    @Override
    public TopicSubscription copy(TopicSubscription from) {
        return TopicSubscription.builder()
                .topic(from.getTopic())
                .subscriptionName(from.getSubscriptionName())
                .range(from.getRange())
                .build();
    }

    @Override
    public TopicSubscription copy(TopicSubscription from, TopicSubscription reuse) {
        return copy(from);
    }

    @Override
    public int getLength() {
        return -1;
    }

    @Override
    public void serialize(TopicSubscription record, DataOutputView target) throws IOException {
        final byte[] bytes = record.getTopic().getBytes();
        target.writeInt(bytes.length);
        target.write(bytes);
        final byte[] range = toBytes(record.getRange());
        target.writeInt(range.length);
        target.write(range);

        final String subscriptionName = record.getSubscriptionName();
        if (subscriptionName == null) {
            target.writeInt(0);
            return;
        }
        final byte[] subscriptionNameBytes = subscriptionName.getBytes();
        target.writeInt(subscriptionNameBytes.length);
        target.write(subscriptionNameBytes);

    }

    private byte[] toBytes(SerializableRange range) throws IOException {
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
             ObjectOutputStream out = new ObjectOutputStream(baos)) {
            out.writeObject(range);
            out.flush();
            return baos.toByteArray();
        }
    }

    private SerializableRange toObject(byte[] serialized) throws IOException {
        try (ByteArrayInputStream bais = new ByteArrayInputStream(serialized);
             ObjectInputStream in = new ObjectInputStream(bais)) {
            try {
                return (SerializableRange) in.readObject();
            } catch (ClassNotFoundException e) {
                throw new IllegalStateException(e);
            }
        }
    }

    @Override
    public TopicSubscription deserialize(DataInputView source) throws IOException {
        final TopicSubscription.TopicSubscriptionBuilder builder = TopicSubscription.builder();
        int length = source.readInt();
        byte[] serialized = new byte[length];
        source.read(serialized);
        builder.topic(new String(serialized));

        length = source.readInt();
        serialized = new byte[length];
        source.read(serialized);
        builder.range(toObject(serialized));

        length = source.readInt();
        if (length != 0) {
            serialized = new byte[length];
            source.read(serialized);
            builder.subscriptionName(new String(serialized));
        }
        return builder.build();
    }

    @Override
    public TopicSubscription deserialize(TopicSubscription reuse, DataInputView source) throws IOException {
        return deserialize(source);
    }

    @Override
    public void copy(DataInputView source, DataOutputView target) throws IOException {
        serialize(deserialize(source), target);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        } else {
            return obj != null && this.getClass() == obj.getClass();
        }
    }

    @Override
    public int hashCode() {
        return this.getClass().hashCode();
    }

    @Override
    public TypeSerializerSnapshot snapshotConfiguration() {
        return new TopicSubscriptionSerializer.TopicSubscriptionSerializerSnapshot();
    }

    // ------------------------------------------------------------------------

    /**
     * Serializer configuration snapshot for compatibility and format evolution.
     */
    @SuppressWarnings("WeakerAccess")
    public static final class TopicSubscriptionSerializerSnapshot
            extends SimpleTypeSerializerSnapshot {

        public TopicSubscriptionSerializerSnapshot() {
            super(() -> INSTANCE);
        }
    }
}