66 lines
1.7 KiB
Java
66 lines
1.7 KiB
Java
package it.cavallium.dbengine.database.serialization;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.ByteBufAllocator;
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import io.netty.buffer.ByteBufUtil;
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import io.netty.buffer.PooledByteBufAllocator;
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import java.nio.charset.StandardCharsets;
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import org.jetbrains.annotations.NotNull;
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public interface Serializer<A, B> {
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@NotNull A deserialize(@NotNull B serialized);
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@NotNull B serialize(@NotNull A deserialized);
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Serializer<ByteBuf, ByteBuf> NOOP_SERIALIZER = new Serializer<>() {
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@Override
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public @NotNull ByteBuf deserialize(@NotNull ByteBuf serialized) {
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try {
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return serialized.retainedSlice();
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} finally {
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serialized.release();
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}
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}
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@Override
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public @NotNull ByteBuf serialize(@NotNull ByteBuf deserialized) {
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try {
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return deserialized.retainedSlice();
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} finally {
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deserialized.release();
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}
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}
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};
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static Serializer<ByteBuf, ByteBuf> noop() {
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return NOOP_SERIALIZER;
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}
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static Serializer<String, ByteBuf> utf8(ByteBufAllocator allocator) {
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return new Serializer<>() {
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@Override
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public @NotNull String deserialize(@NotNull ByteBuf serialized) {
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try {
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var length = serialized.readInt();
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var result = serialized.toString(serialized.readerIndex(), length, StandardCharsets.UTF_8);
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serialized.readerIndex(serialized.readerIndex() + length);
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return result;
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} finally {
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serialized.release();
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}
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}
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@Override
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public @NotNull ByteBuf serialize(@NotNull String deserialized) {
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// UTF-8 uses max. 3 bytes per char, so calculate the worst case.
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int length = ByteBufUtil.utf8Bytes(deserialized);
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ByteBuf buf = allocator.buffer(Integer.BYTES + length);
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buf.writeInt(length);
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ByteBufUtil.writeUtf8(buf, deserialized);
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return buf;
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}
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};
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}
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}
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