org.apache.cassandra.io.compress.SnappyCompressor Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of cassandra-unit-shaded Show documentation
Show all versions of cassandra-unit-shaded Show documentation
Shaded version of cassandra-unit
/*
* 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.compress;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xerial.snappy.Snappy;
import org.xerial.snappy.SnappyError;
import org.apache.cassandra.utils.JVMStabilityInspector;
public class SnappyCompressor implements ICompressor
{
public static final SnappyCompressor instance = new SnappyCompressor();
private static Logger logger = LoggerFactory.getLogger(SnappyCompressor.class);
static
{
if (!isAvailable())
logger.warn("Cannot initialize native Snappy library. Compression on new sstables will be disabled.");
}
public static SnappyCompressor create(Map compressionOptions)
{
// this would throw java.lang.NoClassDefFoundError if Snappy class
// wasn't found at runtime which should be processed by calling method
Snappy.getNativeLibraryVersion();
// no specific options supported so far
return instance;
}
public static boolean isAvailable()
{
try
{
create(Collections.emptyMap());
return true;
}
catch (Exception e)
{
JVMStabilityInspector.inspectThrowable(e);
return false;
}
catch (NoClassDefFoundError | SnappyError | UnsatisfiedLinkError e)
{
return false;
}
}
public Set supportedOptions()
{
return Collections.emptySet();
}
public int initialCompressedBufferLength(int chunkLength)
{
return Snappy.maxCompressedLength(chunkLength);
}
public void compress(ByteBuffer input, ByteBuffer output) throws IOException
{
int dlimit = output.limit();
Snappy.compress(input, output);
// Snappy doesn't match the ICompressor contract w/regards to state it leaves dest ByteBuffer's counters in
output.position(output.limit());
output.limit(dlimit);
input.position(input.limit());
}
public int uncompress(byte[] input, int inputOffset, int inputLength, byte[] output, int outputOffset) throws IOException
{
return Snappy.rawUncompress(input, inputOffset, inputLength, output, outputOffset);
}
public void uncompress(ByteBuffer input, ByteBuffer output)
throws IOException
{
int dlimit = output.limit();
Snappy.uncompress(input, output);
// Snappy doesn't match the ICompressor contract w/regards to state it leaves dest ByteBuffer's counters in
output.position(output.limit());
output.limit(dlimit);
input.position(input.limit());
}
public BufferType preferredBufferType()
{
return BufferType.OFF_HEAP;
}
public boolean supports(BufferType bufferType)
{
// Snappy can't deal with different input and output buffer types.
// To avoid possible problems, pretend it can't support array-backed at all.
return bufferType == BufferType.OFF_HEAP;
}
}