132 lines
4.2 KiB
Java
132 lines
4.2 KiB
Java
/*
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* FileSponge
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* Copyright (C) 2021 Andrea Cavalli
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.warp.filesponge;
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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.ByteBufInputStream;
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import io.netty.buffer.ByteBufOutputStream;
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import io.netty.buffer.PooledByteBufAllocator;
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import io.netty.buffer.api.Buffer;
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import io.netty.buffer.api.BufferAllocator;
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import io.netty.buffer.api.Send;
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import it.cavallium.dbengine.database.serialization.BufferDataInput;
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import it.cavallium.dbengine.database.serialization.BufferDataOutput;
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import it.cavallium.dbengine.database.serialization.Serializer;
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import it.unimi.dsi.fastutil.booleans.BooleanArrayList;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import org.apache.commons.lang3.SerializationException;
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import org.jetbrains.annotations.NotNull;
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/**
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* size -1 = unknown size
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*/
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public record DiskMetadata(int size, BooleanArrayList downloadedBlocks) {
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public boolean isDownloadedFully() {
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boolean downloadedFullyVal;
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// Ensure blocks count is valid by calling getBlocksCount()
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getBlocksCount();
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// It's fully downloaded if every block is true
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downloadedFullyVal = !this.downloadedBlocks().contains(false);
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return downloadedFullyVal;
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}
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@SuppressWarnings("UnusedReturnValue")
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private int getBlocksCount() {
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if (size == -1) {
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return downloadedBlocks().size();
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}
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var expectedBlocksCount = getBlocksCount(size, FileSponge.BLOCK_SIZE);
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if (this.downloadedBlocks().size() != expectedBlocksCount) {
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throw new IllegalStateException(
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"Blocks array length (" + this.downloadedBlocks().size() + ") != expected blocks count ("
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+ expectedBlocksCount + ")");
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}
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return expectedBlocksCount;
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}
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public static int getBlocksCount(int size, int blockSize) {
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if (size == -1) {
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return 0;
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}
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return (size + (blockSize - size % blockSize)) / blockSize;
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}
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public Metadata asMetadata() {
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return new Metadata(size);
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}
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public boolean isDownloadedBlock(int id) {
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if (size == -1 && downloadedBlocks().size() <= id) {
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return false;
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} else {
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return downloadedBlocks().getBoolean(id);
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}
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}
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public static class DiskMetadataSerializer implements Serializer<DiskMetadata> {
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private final BufferAllocator allocator;
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public DiskMetadataSerializer(BufferAllocator allocator) {
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this.allocator = allocator;
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}
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@Override
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public @NotNull DeserializationResult<DiskMetadata> deserialize(@NotNull Send<Buffer> serialized) {
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var dis = new BufferDataInput(serialized);
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int size = dis.readInt();
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int blocksCount;
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if (size == -1) {
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blocksCount = dis.readShort();
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} else {
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blocksCount = getBlocksCount(size, FileSponge.BLOCK_SIZE);
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}
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var downloadedBlocks = new BooleanArrayList(blocksCount);
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for (int i = 0; i < blocksCount; i++) {
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downloadedBlocks.add(dis.readBoolean());
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}
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return new DeserializationResult<>(new DiskMetadata(size, downloadedBlocks), dis.getReadBytesCount());
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}
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@Override
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public @NotNull Send<Buffer> serialize(@NotNull DiskMetadata deserialized) {
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try (var buffer = allocator.allocate(64)) {
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var dos = new BufferDataOutput(buffer);
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dos.writeInt(deserialized.size());
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if (deserialized.size == -1) {
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dos.writeShort(deserialized.getBlocksCount());
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} else {
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deserialized.getBlocksCount();
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}
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for (boolean downloadedBlock : deserialized.downloadedBlocks()) {
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dos.writeBoolean(downloadedBlock);
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}
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return buffer.send();
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}
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}
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}
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}
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