| /* |
| * 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.hadoop.io.compress.bzip2; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeys; |
| import org.apache.hadoop.util.NativeCodeLoader; |
| |
| import org.apache.hadoop.io.compress.Compressor; |
| import org.apache.hadoop.io.compress.Decompressor; |
| import org.apache.hadoop.io.compress.bzip2.Bzip2Compressor; |
| import org.apache.hadoop.io.compress.bzip2.Bzip2Decompressor; |
| import org.apache.hadoop.io.compress.bzip2.BZip2DummyCompressor; |
| import org.apache.hadoop.io.compress.bzip2.BZip2DummyDecompressor; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * A collection of factories to create the right |
| * bzip2 compressor/decompressor instances. |
| * |
| */ |
| public class Bzip2Factory { |
| private static final Logger LOG = LoggerFactory.getLogger(Bzip2Factory.class); |
| |
| private static String bzip2LibraryName = ""; |
| private static boolean nativeBzip2Loaded; |
| |
| /** |
| * Check if native-bzip2 code is loaded & initialized correctly and |
| * can be loaded for this job. |
| * |
| * @param conf configuration |
| * @return <code>true</code> if native-bzip2 is loaded & initialized |
| * and can be loaded for this job, else <code>false</code> |
| */ |
| public static synchronized boolean isNativeBzip2Loaded(Configuration conf) { |
| String libname = conf.get("io.compression.codec.bzip2.library", |
| "system-native"); |
| if (!bzip2LibraryName.equals(libname)) { |
| nativeBzip2Loaded = false; |
| bzip2LibraryName = libname; |
| if (libname.equals("java-builtin")) { |
| LOG.info("Using pure-Java version of bzip2 library"); |
| } else if (conf.getBoolean( |
| CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_KEY, |
| CommonConfigurationKeys.IO_NATIVE_LIB_AVAILABLE_DEFAULT) && |
| NativeCodeLoader.isNativeCodeLoaded()) { |
| try { |
| // Initialize the native library. |
| Bzip2Compressor.initSymbols(libname); |
| Bzip2Decompressor.initSymbols(libname); |
| nativeBzip2Loaded = true; |
| LOG.info("Successfully loaded & initialized native-bzip2 library " + |
| libname); |
| } catch (Throwable t) { |
| LOG.warn("Failed to load/initialize native-bzip2 library " + |
| libname + ", will use pure-Java version"); |
| } |
| } |
| } |
| return nativeBzip2Loaded; |
| } |
| |
| public static String getLibraryName(Configuration conf) { |
| if (isNativeBzip2Loaded(conf)) { |
| return Bzip2Compressor.getLibraryName(); |
| } else { |
| return bzip2LibraryName; |
| } |
| } |
| |
| /** |
| * Return the appropriate type of the bzip2 compressor. |
| * |
| * @param conf configuration |
| * @return the appropriate type of the bzip2 compressor. |
| */ |
| public static Class<? extends Compressor> |
| getBzip2CompressorType(Configuration conf) { |
| return isNativeBzip2Loaded(conf) ? |
| Bzip2Compressor.class : BZip2DummyCompressor.class; |
| } |
| |
| /** |
| * Return the appropriate implementation of the bzip2 compressor. |
| * |
| * @param conf configuration |
| * @return the appropriate implementation of the bzip2 compressor. |
| */ |
| public static Compressor getBzip2Compressor(Configuration conf) { |
| return isNativeBzip2Loaded(conf)? |
| new Bzip2Compressor(conf) : new BZip2DummyCompressor(); |
| } |
| |
| /** |
| * Return the appropriate type of the bzip2 decompressor. |
| * |
| * @param conf configuration |
| * @return the appropriate type of the bzip2 decompressor. |
| */ |
| public static Class<? extends Decompressor> |
| getBzip2DecompressorType(Configuration conf) { |
| return isNativeBzip2Loaded(conf) ? |
| Bzip2Decompressor.class : BZip2DummyDecompressor.class; |
| } |
| |
| /** |
| * Return the appropriate implementation of the bzip2 decompressor. |
| * |
| * @param conf configuration |
| * @return the appropriate implementation of the bzip2 decompressor. |
| */ |
| public static Decompressor getBzip2Decompressor(Configuration conf) { |
| return isNativeBzip2Loaded(conf) ? |
| new Bzip2Decompressor() : new BZip2DummyDecompressor(); |
| } |
| |
| public static void setBlockSize(Configuration conf, int blockSize) { |
| conf.setInt("bzip2.compress.blocksize", blockSize); |
| } |
| |
| public static int getBlockSize(Configuration conf) { |
| return conf.getInt("bzip2.compress.blocksize", |
| Bzip2Compressor.DEFAULT_BLOCK_SIZE); |
| } |
| |
| public static void setWorkFactor(Configuration conf, int workFactor) { |
| conf.setInt("bzip2.compress.workfactor", workFactor); |
| } |
| |
| public static int getWorkFactor(Configuration conf) { |
| return conf.getInt("bzip2.compress.workfactor", |
| Bzip2Compressor.DEFAULT_WORK_FACTOR); |
| } |
| |
| } |