| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.hyracks.storage.common.file; |
| |
| import java.nio.ByteBuffer; |
| import java.util.concurrent.BlockingQueue; |
| |
| import org.apache.hyracks.api.compression.ICompressorDecompressor; |
| import org.apache.hyracks.api.exceptions.HyracksDataException; |
| import org.apache.hyracks.api.io.FileReference; |
| import org.apache.hyracks.api.io.IIOManager; |
| import org.apache.hyracks.storage.common.buffercache.BufferCache; |
| import org.apache.hyracks.storage.common.buffercache.BufferCacheHeaderHelper; |
| import org.apache.hyracks.storage.common.buffercache.CachedPage; |
| import org.apache.hyracks.storage.common.buffercache.IPageReplacementStrategy; |
| import org.apache.hyracks.storage.common.compression.file.CompressedFileManager; |
| import org.apache.hyracks.storage.common.compression.file.CompressedFileReference; |
| import org.apache.hyracks.storage.common.compression.file.ICompressedPageWriter; |
| |
| public class CompressedBufferedFileHandle extends BufferedFileHandle { |
| private final FileReference lafFileRef; |
| private volatile CompressedFileManager compressedFileManager; |
| |
| protected CompressedBufferedFileHandle(int fileId, FileReference lafFileRef, BufferCache bufferCache, |
| IIOManager ioManager, BlockingQueue<BufferCacheHeaderHelper> headerPageCache, |
| IPageReplacementStrategy pageReplacementStrategy) { |
| super(fileId, bufferCache, ioManager, headerPageCache, pageReplacementStrategy); |
| this.lafFileRef = lafFileRef; |
| } |
| |
| @Override |
| public void read(CachedPage cPage) throws HyracksDataException { |
| final BufferCacheHeaderHelper header = checkoutHeaderHelper(); |
| try { |
| compressedFileManager.setCompressedPageInfo(cPage); |
| long bytesRead = readToBuffer(header.prepareRead(cPage.getCompressedPageSize()), getFirstPageOffset(cPage)); |
| |
| if (!verifyBytesRead(cPage.getCompressedPageSize(), bytesRead)) { |
| return; |
| } |
| final ByteBuffer cBuffer = header.processHeader(cPage); |
| final ByteBuffer uBuffer = cPage.getBuffer(); |
| fixBufferPointers(uBuffer, 0); |
| if (cPage.getCompressedPageSize() < bufferCache.getPageSizeWithHeader()) { |
| uncompressToPageBuffer(cBuffer, uBuffer); |
| } else { |
| cPage.getBuffer().put(cBuffer); |
| } |
| |
| final int totalPages = cPage.getFrameSizeMultiplier(); |
| if (totalPages > 1) { |
| pageReplacementStrategy.fixupCapacityOnLargeRead(cPage); |
| readExtraPages(cPage, cBuffer); |
| } |
| } finally { |
| returnHeaderHelper(header); |
| } |
| } |
| |
| private void readExtraPages(CachedPage cPage, ByteBuffer cBuffer) throws HyracksDataException { |
| final ByteBuffer uBuffer = cPage.getBuffer(); |
| |
| final int totalPages = cPage.getFrameSizeMultiplier(); |
| for (int i = 1; i < totalPages; i++) { |
| fixBufferPointers(uBuffer, i); |
| compressedFileManager.setExtraCompressedPageInfo(cPage, i - 1); |
| if (cPage.getCompressedPageSize() < bufferCache.getPageSize()) { |
| cBuffer.position(0); |
| cBuffer.limit(cPage.getCompressedPageSize()); |
| readToBuffer(cBuffer, getExtraPageOffset(cPage)); |
| cBuffer.flip(); |
| uncompressToPageBuffer(cBuffer, cPage.getBuffer()); |
| } else { |
| readToBuffer(uBuffer, getExtraPageOffset(cPage)); |
| } |
| } |
| } |
| |
| @Override |
| protected void write(CachedPage cPage, BufferCacheHeaderHelper header, int totalPages, int extraBlockPageId) |
| throws HyracksDataException { |
| try { |
| final ByteBuffer cBuffer = header.prepareWrite(cPage, getRequiredBufferSize()); |
| final ByteBuffer uBuffer = cPage.getBuffer(); |
| final long pageId = cPage.getDiskPageId(); |
| |
| final long bytesWritten; |
| final long expectedBytesWritten; |
| |
| fixBufferPointers(uBuffer, 0); |
| if (compressToWriteBuffer(uBuffer, cBuffer) < bufferCache.getPageSize()) { |
| cBuffer.position(0); |
| final long offset = compressedFileManager.writePageInfo(pageId, cBuffer.remaining()); |
| expectedBytesWritten = cBuffer.limit(); |
| bytesWritten = writeToFile(cBuffer, offset); |
| } else { |
| //Compression did not gain any savings |
| final ByteBuffer[] buffers = header.prepareWrite(cPage); |
| final long offset = compressedFileManager.writePageInfo(pageId, bufferCache.getPageSizeWithHeader()); |
| expectedBytesWritten = buffers[0].limit() + (long) buffers[1].limit(); |
| bytesWritten = writeToFile(buffers, offset); |
| } |
| |
| verifyBytesWritten(expectedBytesWritten, bytesWritten); |
| |
| //Write extra pages |
| if (totalPages > 1) { |
| writeExtraCompressedPages(cPage, cBuffer, totalPages, extraBlockPageId); |
| } |
| |
| } finally { |
| returnHeaderHelper(header); |
| } |
| } |
| |
| private void writeExtraCompressedPages(CachedPage cPage, ByteBuffer cBuffer, int totalPages, int extraBlockPageId) |
| throws HyracksDataException { |
| final ByteBuffer uBuffer = cPage.getBuffer(); |
| long expectedBytesWritten = 0; |
| long bytesWritten = 0; |
| for (int i = 1; i < totalPages; i++) { |
| fixBufferPointers(uBuffer, i); |
| cBuffer.position(0); |
| |
| final ByteBuffer writeBuffer; |
| if (compressToWriteBuffer(uBuffer, cBuffer) < bufferCache.getPageSize()) { |
| writeBuffer = cBuffer; |
| } else { |
| writeBuffer = uBuffer; |
| } |
| final int length = writeBuffer.remaining(); |
| final long offset = compressedFileManager.writeExtraPageInfo(extraBlockPageId, length, i - 1); |
| expectedBytesWritten += length; |
| bytesWritten += writeToFile(writeBuffer, offset); |
| } |
| |
| verifyBytesWritten(expectedBytesWritten, bytesWritten); |
| |
| } |
| |
| @Override |
| public void open(FileReference fileRef) throws HyracksDataException { |
| final CompressedFileReference cFileRef = (CompressedFileReference) fileRef; |
| compressedFileManager = new CompressedFileManager(bufferCache, cFileRef, ioManager); |
| compressedFileManager.open(); |
| super.open(fileRef); |
| } |
| |
| /** |
| * Decrement the reference counter for LAF file. |
| * It is up to {@link BufferCache} to physically close the file. |
| * see {@link BufferCache#deleteFile(FileReference)} and {@link BufferCache#purgeHandle(int)} |
| */ |
| @Override |
| public void close() throws HyracksDataException { |
| if (hasBeenOpened()) { |
| compressedFileManager.close(); |
| } |
| super.close(); |
| } |
| |
| @Override |
| public void purge() throws HyracksDataException { |
| compressedFileManager.purge(); |
| super.purge(); |
| } |
| |
| @Override |
| public void markAsDeleted() throws HyracksDataException { |
| if (hasBeenOpened()) { |
| compressedFileManager.delete(); |
| compressedFileManager = null; |
| } else { |
| bufferCache.deleteFile(lafFileRef); |
| } |
| super.markAsDeleted(); |
| } |
| |
| @Override |
| public void force(boolean metadata) throws HyracksDataException { |
| compressedFileManager.force(metadata); |
| super.force(metadata); |
| } |
| |
| @Override |
| public int getNumberOfPages() { |
| return compressedFileManager.getNumberOfPages(); |
| } |
| |
| @Override |
| protected long getFirstPageOffset(CachedPage cPage) { |
| return cPage.getCompressedPageOffset(); |
| } |
| |
| @Override |
| protected long getExtraPageOffset(CachedPage cPage) { |
| return getFirstPageOffset(cPage); |
| } |
| |
| @Override |
| public ICompressedPageWriter getCompressedPageWriter() { |
| return compressedFileManager.getCompressedPageWriter(); |
| } |
| |
| /* ******************************** |
| * Compression methods |
| * ******************************** |
| */ |
| |
| private void fixBufferPointers(ByteBuffer uBuffer, int i) { |
| //Fix the uncompressed buffer to point at the i^th extra page |
| uBuffer.position(bufferCache.getPageSize() * i); |
| //Similarly, fix the limit to a page-worth of data from the i^th page |
| uBuffer.limit(uBuffer.position() + bufferCache.getPageSize()); |
| } |
| |
| private void uncompressToPageBuffer(ByteBuffer cBuffer, ByteBuffer uBuffer) throws HyracksDataException { |
| final ICompressorDecompressor compDecomp = compressedFileManager.getCompressorDecompressor(); |
| compDecomp.uncompress(cBuffer, uBuffer); |
| verifyUncompressionSize(bufferCache.getPageSize(), uBuffer.remaining()); |
| } |
| |
| private int compressToWriteBuffer(ByteBuffer uBuffer, ByteBuffer cBuffer) throws HyracksDataException { |
| final ICompressorDecompressor compDecomp = compressedFileManager.getCompressorDecompressor(); |
| compDecomp.compress(uBuffer, cBuffer); |
| return cBuffer.remaining(); |
| } |
| |
| private int getRequiredBufferSize() { |
| final ICompressorDecompressor compDecomp = compressedFileManager.getCompressorDecompressor(); |
| return compDecomp.computeCompressedBufferSize(bufferCache.getPageSize()); |
| } |
| |
| private void verifyUncompressionSize(int expected, int actual) { |
| if (expected != actual) { |
| throwException("Uncompressed", expected, actual); |
| } |
| } |
| |
| } |