flink-state-backends/flink-statebackend-heap-spillable/src/test/java/org/apache/flink/runtime/state/heap/SkipListSerializerTest.java

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package org.apache.flink.runtime.state.heap;

import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.api.common.typeutils.base.StringSerializer;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.core.memory.ByteArrayInputStreamWithPos;
import org.apache.flink.core.memory.DataInputViewStreamWrapper;
import org.apache.flink.core.memory.MemorySegment;
import org.apache.flink.core.memory.MemorySegmentFactory;
import org.apache.flink.util.TestLogger;

import org.junit.Test;

import java.io.IOException;

import static org.junit.Assert.assertEquals;

/** Tests for {@link SkipListKeySerializer}. */
public class SkipListSerializerTest extends TestLogger {
    private static final TypeSerializer<String> keySerializer = StringSerializer.INSTANCE;
    private static final TypeSerializer<String> namespaceSerializer = StringSerializer.INSTANCE;
    private static final SkipListKeySerializer<String, String> skipListKeySerializer =
            new SkipListKeySerializer<>(keySerializer, namespaceSerializer);
    private static final TypeSerializer<String> stateSerializer = StringSerializer.INSTANCE;
    private static final SkipListValueSerializer<String> skipListValueSerializer =
            new SkipListValueSerializer<>(stateSerializer);

    @Test
    public void testSkipListKeySerializerBasicOp() throws IOException {
        testSkipListKeySerializer(0);
    }

    @Test
    public void testSkipListKeySerializerStateless() throws IOException {
        for (int i = 0; i < 10; i++) {
            testSkipListKeySerializer(i);
        }
    }

    private void testSkipListKeySerializer(int delta) throws IOException {
        String key = "key-abcdedg" + delta;
        String namespace = "namespace-dfsfdafd" + delta;

        byte[] skipListKey = skipListKeySerializer.serialize(key, namespace);
        int offset = 10;
        byte[] data = new byte[10 + skipListKey.length];
        System.arraycopy(skipListKey, 0, data, offset, skipListKey.length);
        MemorySegment skipListKeySegment = MemorySegmentFactory.wrap(data);
        assertEquals(
                key,
                skipListKeySerializer.deserializeKey(
                        skipListKeySegment, offset, skipListKey.length));
        assertEquals(
                namespace,
                skipListKeySerializer.deserializeNamespace(
                        skipListKeySegment, offset, skipListKey.length));

        Tuple2<byte[], byte[]> serializedKeyAndNamespace =
                skipListKeySerializer.getSerializedKeyAndNamespace(skipListKeySegment, offset);
        assertEquals(key, deserialize(keySerializer, serializedKeyAndNamespace.f0));
        assertEquals(namespace, deserialize(namespaceSerializer, serializedKeyAndNamespace.f1));

        byte[] serializedNamespace = skipListKeySerializer.serializeNamespace(namespace);
        assertEquals(namespace, deserialize(namespaceSerializer, serializedNamespace));
    }

    @Test
    public void testSkipListValueSerializerBasicOp() throws IOException {
        testSkipListValueSerializer(0);
    }

    @Test
    public void testSkipListValueSerializerStateless() throws IOException {
        for (int i = 0; i < 10; i++) {
            testSkipListValueSerializer(i);
        }
    }

    private void testSkipListValueSerializer(int i) throws IOException {
        String state = "value-" + i;
        byte[] value = skipListValueSerializer.serialize(state);
        int offset = 10;
        byte[] data = new byte[10 + value.length];
        System.arraycopy(value, 0, data, offset, value.length);
        assertEquals(state, deserialize(stateSerializer, value));
        assertEquals(
                state,
                skipListValueSerializer.deserializeState(
                        MemorySegmentFactory.wrap(data), offset, value.length));
    }

    private <T> T deserialize(TypeSerializer<T> serializer, byte[] data) throws IOException {
        ByteArrayInputStreamWithPos inputStream = new ByteArrayInputStreamWithPos(data);
        DataInputViewStreamWrapper inputView = new DataInputViewStreamWrapper(inputStream);
        return serializer.deserialize(inputView);
    }
}