43 lines
1.0 KiB
Java
43 lines
1.0 KiB
Java
package it.cavallium.strangedb.database;
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import it.cavallium.strangedb.BlockInfo;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import static it.cavallium.strangedb.database.IBlocksMetadata.EMPTY_BLOCK_ID;
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public class DatabaseBlocksIO implements IBlocksIO {
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private final DatabaseFileIO fileIO;
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private final IBlocksMetadata blocksMetadata;
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public DatabaseBlocksIO(DatabaseFileIO fileIO, IBlocksMetadata blocksMetadata) {
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this.fileIO = fileIO;
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this.blocksMetadata = blocksMetadata;
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}
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@Override
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public long newBlock(int size, ByteBuffer data) throws IOException {
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if (size == 0) {
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return EMPTY_BLOCK_ID;
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}
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long index = fileIO.writeAtEnd(size, data);
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return blocksMetadata.newBlock(index, size);
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}
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@Override
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public ByteBuffer readBlock(long blockId) throws IOException {
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if (blockId == EMPTY_BLOCK_ID) {
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return ByteBuffer.wrap(new byte[0]);
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}
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BlockInfo blockInfo = blocksMetadata.getBlockInfo(blockId);
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return fileIO.readAt(blockInfo.getIndex(), blockInfo.getSize());
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}
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@Override
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public void close() {
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}
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}
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