| /** |
| * 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.tools; |
| |
| import java.io.BufferedReader; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.InputStreamReader; |
| import java.io.RandomAccessFile; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.cassandra.io.DataOutputBuffer; |
| import org.apache.cassandra.utils.BloomFilter; |
| |
| |
| public class ThreadListBuilder |
| { |
| private final static int bufSize_ = 64*1024*1024; |
| private final static int count_ = 128*1024*1024; |
| |
| public static void main(String[] args) throws Throwable |
| { |
| if ( args.length != 2 ) |
| { |
| System.out.println("Usage : java org.apache.cassandra.tools.ThreadListBuilder <directory containing files to be processed> <directory to dump the bloom filter in.>"); |
| System.exit(1); |
| } |
| |
| File directory = new File(args[0]); |
| File[] files = directory.listFiles(); |
| List<DataOutputBuffer> buffers = new ArrayList<DataOutputBuffer>(); |
| BloomFilter bf = new BloomFilter(count_, 8); |
| int keyCount = 0; |
| |
| /* Process the list of files. */ |
| for ( File file : files ) |
| { |
| System.out.println("Processing file " + file); |
| BufferedReader bufReader = new BufferedReader( new InputStreamReader( new FileInputStream(file) ), ThreadListBuilder.bufSize_ ); |
| String line = null; |
| |
| while ( (line = bufReader.readLine()) != null ) |
| { |
| /* After accumulating count_ keys reset the bloom filter. */ |
| if ( keyCount > 0 && keyCount % count_ == 0 ) |
| { |
| DataOutputBuffer bufOut = new DataOutputBuffer(); |
| BloomFilter.serializer().serialize(bf, bufOut); |
| System.out.println("Finished serializing the bloom filter"); |
| buffers.add(bufOut); |
| bf = new BloomFilter(count_, 8); |
| } |
| line = line.trim(); |
| bf.add(line); |
| ++keyCount; |
| } |
| } |
| |
| /* Add the bloom filter assuming the last one was left out */ |
| DataOutputBuffer bufOut = new DataOutputBuffer(); |
| BloomFilter.serializer().serialize(bf, bufOut); |
| buffers.add(bufOut); |
| |
| |
| int size = buffers.size(); |
| for ( int i = 0; i < size; ++i ) |
| { |
| DataOutputBuffer buffer = buffers.get(i); |
| String file = args[1] + File.separator + "Bloom-Filter-" + i + ".dat"; |
| RandomAccessFile raf = new RandomAccessFile(file, "rw"); |
| raf.write(buffer.getData(), 0, buffer.getLength()); |
| raf.close(); |
| buffer.close(); |
| } |
| System.out.println("Done writing the bloom filter to disk"); |
| } |
| } |