| /* |
| * 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.cassandra.io.util; |
| |
| import com.google.common.util.concurrent.RateLimiter; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.config.Config; |
| import org.apache.cassandra.config.DatabaseDescriptor; |
| import org.apache.cassandra.io.compress.CompressedRandomAccessReader; |
| import org.apache.cassandra.io.compress.CompressedSequentialWriter; |
| import org.apache.cassandra.io.compress.CompressionMetadata; |
| import org.apache.cassandra.utils.JVMStabilityInspector; |
| import org.apache.cassandra.utils.concurrent.Ref; |
| |
| public class CompressedSegmentedFile extends SegmentedFile implements ICompressedFile |
| { |
| private static final Logger logger = LoggerFactory.getLogger(CompressedSegmentedFile.class); |
| private static final boolean useMmap = DatabaseDescriptor.getDiskAccessMode() == Config.DiskAccessMode.mmap; |
| |
| public final CompressionMetadata metadata; |
| private final MmappedRegions regions; |
| |
| public CompressedSegmentedFile(ChannelProxy channel, int bufferSize, CompressionMetadata metadata) |
| { |
| this(channel, |
| bufferSize, |
| metadata, |
| useMmap |
| ? MmappedRegions.map(channel, metadata) |
| : null); |
| } |
| |
| public CompressedSegmentedFile(ChannelProxy channel, int bufferSize, CompressionMetadata metadata, MmappedRegions regions) |
| { |
| super(new Cleanup(channel, metadata, regions), channel, bufferSize, metadata.dataLength, metadata.compressedFileLength); |
| this.metadata = metadata; |
| this.regions = regions; |
| } |
| |
| private CompressedSegmentedFile(CompressedSegmentedFile copy) |
| { |
| super(copy); |
| this.metadata = copy.metadata; |
| this.regions = copy.regions; |
| } |
| |
| public ChannelProxy channel() |
| { |
| return channel; |
| } |
| |
| public MmappedRegions regions() |
| { |
| return regions; |
| } |
| |
| private static final class Cleanup extends SegmentedFile.Cleanup |
| { |
| final CompressionMetadata metadata; |
| private final MmappedRegions regions; |
| |
| protected Cleanup(ChannelProxy channel, CompressionMetadata metadata, MmappedRegions regions) |
| { |
| super(channel); |
| this.metadata = metadata; |
| this.regions = regions; |
| } |
| public void tidy() |
| { |
| Throwable err = regions == null ? null : regions.close(null); |
| if (err != null) |
| { |
| JVMStabilityInspector.inspectThrowable(err); |
| |
| // This is not supposed to happen |
| logger.error("Error while closing mmapped regions", err); |
| } |
| |
| metadata.close(); |
| |
| super.tidy(); |
| } |
| } |
| |
| public CompressedSegmentedFile sharedCopy() |
| { |
| return new CompressedSegmentedFile(this); |
| } |
| |
| public void addTo(Ref.IdentityCollection identities) |
| { |
| super.addTo(identities); |
| metadata.addTo(identities); |
| } |
| |
| public static class Builder extends SegmentedFile.Builder |
| { |
| final CompressedSequentialWriter writer; |
| public Builder(CompressedSequentialWriter writer) |
| { |
| this.writer = writer; |
| } |
| |
| protected CompressionMetadata metadata(String path, long overrideLength) |
| { |
| if (writer == null) |
| return CompressionMetadata.create(path); |
| |
| return writer.open(overrideLength); |
| } |
| |
| public SegmentedFile complete(ChannelProxy channel, int bufferSize, long overrideLength) |
| { |
| return new CompressedSegmentedFile(channel, bufferSize, metadata(channel.filePath(), overrideLength)); |
| } |
| } |
| |
| public void dropPageCache(long before) |
| { |
| if (before >= metadata.dataLength) |
| super.dropPageCache(0); |
| super.dropPageCache(metadata.chunkFor(before).offset); |
| } |
| |
| public RandomAccessReader createReader() |
| { |
| return new CompressedRandomAccessReader.Builder(this).build(); |
| } |
| |
| public RandomAccessReader createReader(RateLimiter limiter) |
| { |
| return new CompressedRandomAccessReader.Builder(this).limiter(limiter).build(); |
| } |
| |
| public CompressionMetadata getMetadata() |
| { |
| return metadata; |
| } |
| } |