public Compressor getCompressor() {
CompressionCodec codec = getCodec(conf);
if (codec != null) {
Compressor compressor = CodecPool.getCompressor(codec);
if (LOG.isTraceEnabled()) LOG.trace("Retrieved compressor " + compressor + " from pool.");
if (compressor != null) {
if (compressor.finished()) {
// Somebody returns the compressor to CodecPool but is still using it.
LOG.warn("Compressor obtained from CodecPool is already finished()");
}
compressor.reset();
}
return compressor;
}
return null;
}
public Compressor getCompressor() {
CompressionCodec codec = getCodec(conf);
if (codec != null) {
Compressor compressor = CodecPool.getCompressor(codec);
if (compressor != null) {
if (compressor.finished()) {
// Somebody returns the compressor to CodecPool but is still using
// it.
LOG.warn("Compressor obtained from CodecPool is already finished()");
// throw new AssertionError(
// "Compressor obtained from CodecPool is already finished()");
}
compressor.reset();
}
return compressor;
}
return null;
}
/**
* Find the size of compressed data assuming that buffer will be compressed using given algorithm.
*
* @param algo compression algorithm
* @param compressor compressor already requested from codec
* @param inputBuffer Array to be compressed.
* @param offset Offset to beginning of the data.
* @param length Length to be compressed.
* @return Size of compressed data in bytes.
* @throws IOException
*/
public static int getCompressedSize(
Algorithm algo, Compressor compressor, byte[] inputBuffer, int offset, int length)
throws IOException {
DataOutputStream compressedStream = new DataOutputStream(new IOUtils.NullOutputStream());
if (compressor != null) {
compressor.reset();
}
OutputStream compressingStream = null;
try {
compressingStream = algo.createCompressionStream(compressedStream, compressor, 0);
compressingStream.write(inputBuffer, offset, length);
compressingStream.flush();
return compressedStream.size();
} finally {
if (compressingStream != null) compressingStream.close();
}
}