Lucene example source code file (TestHugeRamFile.java)

This example Lucene source code file (TestHugeRamFile.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Lucene tags/keywords

denseramfile, denseramfile, hashmap, io, ioexception, l-j, max_value, max_value, override, ramfile, raminputstream, raminputstream, ramoutputstream, ramoutputstream, testhugeramfile, util

The Lucene TestHugeRamFile.java source code

package org.apache.lucene.store;

/**
 * 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.
 */

import java.io.IOException;
import java.util.HashMap;

import org.apache.lucene.util.LuceneTestCase;

/** Test huge RAMFile with more than Integer.MAX_VALUE bytes. */
public class TestHugeRamFile extends LuceneTestCase {
  
  private static final long MAX_VALUE = (long) 2 * (long) Integer.MAX_VALUE;

  /** Fake a huge ram file by using the same byte buffer for all 
   * buffers under maxint. */
  private static class DenseRAMFile extends RAMFile {
    private long capacity = 0;
    private HashMap<Integer,byte[]> singleBuffers = new HashMap();
    @Override
    protected byte[] newBuffer(int size) {
      capacity += size;
      if (capacity <= MAX_VALUE) {
        // below maxint we reuse buffers
        byte buf[] = singleBuffers.get(Integer.valueOf(size));
        if (buf==null) {
          buf = new byte[size]; 
          //System.out.println("allocate: "+size);
          singleBuffers.put(Integer.valueOf(size),buf);
        }
        return buf;
      }
      //System.out.println("allocate: "+size); System.out.flush();
      return new byte[size];
    }
  }
  
  /** Test huge RAMFile with more than Integer.MAX_VALUE bytes. (LUCENE-957) */
  public void testHugeFile() throws IOException {
    DenseRAMFile f = new DenseRAMFile();
    // output part
    RAMOutputStream out = new RAMOutputStream(f);
    byte b1[] = new byte[RAMOutputStream.BUFFER_SIZE];
    byte b2[] = new byte[RAMOutputStream.BUFFER_SIZE / 3];
    for (int i = 0; i < b1.length; i++) {
      b1[i] = (byte) (i & 0x0007F);
    }
    for (int i = 0; i < b2.length; i++) {
      b2[i] = (byte) (i & 0x0003F);
    }
    long n = 0;
    assertEquals("output length must match",n,out.length());
    while (n <= MAX_VALUE - b1.length) {
      out.writeBytes(b1,0,b1.length);
      out.flush();
      n += b1.length;
      assertEquals("output length must match",n,out.length());
    }
    //System.out.println("after writing b1's, length = "+out.length()+" (MAX_VALUE="+MAX_VALUE+")");
    int m = b2.length;
    long L = 12;
    for (int j=0; j<L; j++) {
      for (int i = 0; i < b2.length; i++) {
        b2[i]++;
      }
      out.writeBytes(b2,0,m);
      out.flush();
      n += m;
      assertEquals("output length must match",n,out.length());
    }
    out.close();
    // input part
    RAMInputStream in = new RAMInputStream(f);
    assertEquals("input length must match",n,in.length());
    //System.out.println("input length = "+in.length()+" % 1024 = "+in.length()%1024);
    for (int j=0; j<L; j++) {
      long loc = n - (L-j)*m; 
      in.seek(loc/3);
      in.seek(loc);
      for (int i=0; i<m; i++) {
        byte bt = in.readByte();
        byte expected = (byte) (1 + j + (i & 0x0003F));
        assertEquals("must read same value that was written! j="+j+" i="+i,expected,bt);
      }
    }
  }
}