hadoop JarBuilder 源码

haddop JarBuilder 代码

文件路径：/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/JarBuilder.java

/**
 * 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.streaming;

import java.io.*;
import java.util.*;
import java.util.jar.*;
import java.util.zip.ZipException;

/**
 * This class is the main class for generating job.jar
 * for Hadoop Streaming jobs. It includes the files specified 
 * with the -file option and includes them in the jar. Also,
 * hadoop-streaming is a user level appplication, so all the classes
 * with hadoop-streaming that are needed in the job are also included
 * in the job.jar.
 */
public class JarBuilder {

  public JarBuilder() {
  }

  public void setVerbose(boolean v) {
    this.verbose = v;
  }

  public void merge(List srcNames, List srcUnjar, String dstJar) throws IOException {
    String source = null;
    JarOutputStream jarOut = null;
    JarFile jarSource = null;
    jarOut = new JarOutputStream(new FileOutputStream(dstJar));
    boolean throwing = false;
    try {
      if (srcNames != null) {
        Iterator iter = srcNames.iterator();
        while (iter.hasNext()) {
          source = (String) iter.next();
          File fsource = new File(source);
          String base = getBasePathInJarOut(source);
          if (!fsource.exists()) {
            throwing = true;
            throw new FileNotFoundException(fsource.getAbsolutePath());
          }
          if (fsource.isDirectory()) {
            addDirectory(jarOut, base, fsource, 0);
          } else {
            addFileStream(jarOut, base, fsource);
          }
        }
      }
      if (srcUnjar != null) {
        Iterator iter = srcUnjar.iterator();
        while (iter.hasNext()) {
          source = (String) iter.next();
          jarSource = new JarFile(source);
          addJarEntries(jarOut, jarSource);
          jarSource.close();
        }

      }
    } finally {
      try {
        jarOut.close();
      } catch (ZipException z) {
        if (!throwing) {
          throw new IOException(z.toString());
        }
      }
    }
  }

  protected String fileExtension(String file) {
    int leafPos = file.lastIndexOf('/');
    if (leafPos == file.length() - 1) return "";
    String leafName = file.substring(leafPos + 1);
    int dotPos = leafName.lastIndexOf('.');
    if (dotPos == -1) return "";
    String ext = leafName.substring(dotPos + 1);
    return ext;
  }

  /** @return empty or a jar base path. Must not start with '/' */
  protected String getBasePathInJarOut(String sourceFile) {
    // TaskRunner will unjar and append to classpath: .:classes/:lib/*    	
    String ext = fileExtension(sourceFile);
    if (ext.equals("class")) {
      return "classes/"; // or ""
    } else if (ext.equals("jar") || ext.equals("zip")) {
      return "lib/";
    } else {
      return "";
    }
  }

  private void addJarEntries(JarOutputStream dst, JarFile src) throws IOException {
    Enumeration entries = src.entries();
    JarEntry entry = null;
    while (entries.hasMoreElements()) {
      entry = (JarEntry) entries.nextElement();
      //if (entry.getName().startsWith("META-INF/")) continue; 
      InputStream in = src.getInputStream(entry);
      addNamedStream(dst, entry.getName(), in);
    }
  }

  /** @param name path in jar for this jar element. Must not start with '/' */
  void addNamedStream(JarOutputStream dst, String name, InputStream in) throws IOException {
    if (verbose) {
      System.err.println("JarBuilder.addNamedStream " + name);
    }
    try {
      dst.putNextEntry(new JarEntry(name));
      int bytesRead = 0;
      while ((bytesRead = in.read(buffer, 0, BUFF_SIZE)) != -1) {
        dst.write(buffer, 0, bytesRead);
      }
    } catch (ZipException ze) {
      if (ze.getMessage().indexOf("duplicate entry") >= 0) {
        if (verbose) {
          System.err.println(ze + " Skip duplicate entry " + name);
        }
      } else {
        throw ze;
      }
    } finally {
      in.close();
      dst.flush();
      dst.closeEntry();
    }
  }

  void addFileStream(JarOutputStream dst, String jarBaseName, File file) throws IOException {
    FileInputStream in = new FileInputStream(file);
    try {
      String name = jarBaseName + file.getName();
      addNamedStream(dst, name, in);
    } finally {
      in.close();
    }
  }

  void addDirectory(JarOutputStream dst, String jarBaseName, File dir, int depth) throws IOException {
    File[] contents = dir.listFiles();
    if (contents != null) {
      for (int i = 0; i < contents.length; i++) {
        File f = contents[i];
        String fBaseName = (depth == 0) ? "" : dir.getName();
        if (jarBaseName.length() > 0) {
          fBaseName = jarBaseName + "/" + fBaseName;
        }
        if (f.isDirectory()) {
          addDirectory(dst, fBaseName, f, depth + 1);
        } else {
          addFileStream(dst, fBaseName + "/", f);
        }
      }
    }
  }

  /** Test program */
  public static void main(String args[]) {
    // args = new String[] { "C:/Temp/merged.jar", "C:/jdk1.5.0/jre/lib/ext/dnsns.jar",  "/Temp/addtojar2.log", "C:/jdk1.5.0/jre/lib/ext/mtest.jar", "C:/Temp/base"};
    if (args.length < 2) {
      System.err.println("Usage: JarFiles merged.jar [src.jar | dir | file ]+");
    } else {
      JarBuilder jarFiles = new JarBuilder();
      List names = new ArrayList();
      List unjar = new ArrayList();
      for (int i = 1; i < args.length; i++) {
        String f = args[i];
        String ext = jarFiles.fileExtension(f);
        boolean expandAsJar = ext.equals("jar") || ext.equals("zip");
        if (expandAsJar) {
          unjar.add(f);
        } else {
          names.add(f);
        }
      }
      try {
        jarFiles.merge(names, unjar, args[0]);
        Date lastMod = new Date(new File(args[0]).lastModified());
        System.out.println("Merge done to " + args[0] + " " + lastMod);
      } catch (Exception ge) {
        ge.printStackTrace(System.err);
      }
    }
  }

  private static final int BUFF_SIZE = 32 * 1024;
  private byte buffer[] = new byte[BUFF_SIZE];
  protected boolean verbose = false;
}

相关信息

hadoop 源码目录

相关文章

hadoop AutoInputFormat 源码

hadoop DumpTypedBytes 源码

hadoop Environment 源码

hadoop HadoopStreaming 源码

hadoop LoadTypedBytes 源码

hadoop PathFinder 源码

hadoop PipeCombiner 源码

hadoop PipeMapRed 源码

hadoop PipeMapRunner 源码

hadoop PipeMapper 源码