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Lucene example source code file (TestByteSlices.java)

This example Lucene source code file (TestByteSlices.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

arraylist, byteblockallocator, byteblockpool, byteblockpool, byteslicereader, byteslicewriter, byteslicewriter, override, override, random_multiplier, testbyteslices, throwable, util, verbose, verbose

The Lucene TestByteSlices.java source code

package org.apache.lucene.index;

/**
 * Licensed 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.util.ArrayList;
import java.util.List;

import org.apache.lucene.util.LuceneTestCase;

public class TestByteSlices extends LuceneTestCase {

  private static class ByteBlockAllocator extends ByteBlockPool.Allocator {
    ArrayList<byte[]> freeByteBlocks = new ArrayList();
    
    /* Allocate another byte[] from the shared pool */
    @Override
    synchronized byte[] getByteBlock() {
      final int size = freeByteBlocks.size();
      final byte[] b;
      if (0 == size)
        b = new byte[DocumentsWriter.BYTE_BLOCK_SIZE];
      else
        b =  freeByteBlocks.remove(size-1);
      return b;
    }

    /* Return a byte[] to the pool */
    @Override
    synchronized void recycleByteBlocks(byte[][] blocks, int start, int end) {
      for(int i=start;i<end;i++)
        freeByteBlocks.add(blocks[i]);
    }

    @Override
    synchronized void recycleByteBlocks(List<byte[]> blocks) {
      final int size = blocks.size();
      for(int i=0;i<size;i++)
        freeByteBlocks.add(blocks.get(i));
    }
  }

  public void testBasic() throws Throwable {
    ByteBlockPool pool = new ByteBlockPool(new ByteBlockAllocator());

    final int NUM_STREAM = 100 * RANDOM_MULTIPLIER;

    ByteSliceWriter writer = new ByteSliceWriter(pool);

    int[] starts = new int[NUM_STREAM];
    int[] uptos = new int[NUM_STREAM];
    int[] counters = new int[NUM_STREAM];

    ByteSliceReader reader = new ByteSliceReader();

    for(int ti=0;ti<100;ti++) {

      for(int stream=0;stream<NUM_STREAM;stream++) {
        starts[stream] = -1;
        counters[stream] = 0;
      }
      
      int num = 10000 * RANDOM_MULTIPLIER;
      for (int iter = 0; iter < num; iter++) {
        int stream = random.nextInt(NUM_STREAM);
        if (VERBOSE)
          System.out.println("write stream=" + stream);

        if (starts[stream] == -1) {
          final int spot = pool.newSlice(ByteBlockPool.FIRST_LEVEL_SIZE);
          starts[stream] = uptos[stream] = spot + pool.byteOffset;
          if (VERBOSE)
            System.out.println("  init to " + starts[stream]);
        }

        writer.init(uptos[stream]);
        int numValue = random.nextInt(20);
        for(int j=0;j<numValue;j++) {
          if (VERBOSE)
            System.out.println("    write " + (counters[stream]+j));
          // write some large (incl. negative) ints:
          writer.writeVInt(random.nextInt());
          writer.writeVInt(counters[stream]+j);
        }
        counters[stream] += numValue;
        uptos[stream] = writer.getAddress();
        if (VERBOSE)
          System.out.println("    addr now " + uptos[stream]);
      }
    
      for(int stream=0;stream<NUM_STREAM;stream++) {
        if (VERBOSE)
          System.out.println("  stream=" + stream + " count=" + counters[stream]);

        if (starts[stream] != -1 && starts[stream] != uptos[stream]) {
          reader.init(pool, starts[stream], uptos[stream]);
          for(int j=0;j<counters[stream];j++) {
            reader.readVInt();
            assertEquals(j, reader.readVInt()); 
          }
        }
      }

      pool.reset();
    }
  }
}

Other Lucene examples (source code examples)

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