Examples of org.infinispan.lucene.testutils.RepeatableLongByteSequence

org.infinispan.lucene.testutils.RepeatableLongByteSequence
RepeatableLongByteSequence is a testing utility to get a source of bytes. Use nextByte() to produce them. The generated sequence is similar to a random generated sequence, but will always generate the same sequence and avoid immediate repetitions of bytes and close repetitive patterns (they might occur in large scale). After having written such a stream from one instance, create a second instance to assert equality of contents (see test) as the source is not random and will generate the same sequence. @author Sanne Grinovero @since 4.0

      assert BUFFER_SIZE < FILE_SIZE;
      createFileWithRepeatableContent(dir, "RandomSampleFile.txt", FILE_SIZE);


      IndexInput indexInput = dir.openInput("RandomSampleFile.txt");
      assert indexInput.length() == FILE_SIZE;
      RepeatableLongByteSequence bytesGenerator = new RepeatableLongByteSequence();


      Random r = new Random();
      long seekPoint = 0;
      // Now it reads some random byte and it compares to the expected byte
      for (int i = 0; i < FILE_SIZE; i++) {
         if (seekPoint == i) {
            byte expectedByte = bytesGenerator.nextByte();
            byte actualByte = indexInput.readByte();
            assert expectedByte == actualByte;
            seekPoint = indexInput.getFilePointer() + r.nextInt(10);
            indexInput.seek(seekPoint);
         } else {
            bytesGenerator.nextByte();
         }


      }
      indexInput.close();
      dir.close();

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   private void assertReadBytesWorkingCorrectly(Directory dir, String fileName,
            final int contentFileSizeExpected, final int arrayLengthToRead) throws IOException {
      IndexInput indexInput = dir.openInput(fileName);
      AssertJUnit.assertEquals(contentFileSizeExpected, indexInput.length());


      RepeatableLongByteSequence bytesGenerator = new RepeatableLongByteSequence();


      byte[] readBytes = new byte[arrayLengthToRead];
      byte[] expectedBytes = new byte[arrayLengthToRead];


      long toRead = contentFileSizeExpected;
      while (toRead > 0) {
         // the condition is satisfied when the file is close to the end
         if (toRead < arrayLengthToRead) {
            readBytes = new byte[(int) toRead];
            expectedBytes = new byte[(int) toRead];
         }
         int nextBytesToRead = (int) Math.min(toRead, arrayLengthToRead);


         bytesGenerator.nextBytes(expectedBytes);
         indexInput.readBytes(readBytes, 0, nextBytesToRead);


         assert Arrays.equals(expectedBytes, readBytes);


         toRead = toRead - nextBytesToRead;

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    */
   private void assertReadByteWorkingCorrectly(Directory dir, String fileName,
            final int contentFileSizeExpected) throws IOException {
      IndexInput indexInput = dir.openInput(fileName);
      AssertJUnit.assertEquals(contentFileSizeExpected, indexInput.length());
      RepeatableLongByteSequence bytesGenerator = new RepeatableLongByteSequence();


      for (int i = 0; i < contentFileSizeExpected; i++) {
         AssertJUnit.assertEquals(bytesGenerator.nextByte(), indexInput.readByte());
      }
      indexInput.close();
   }

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    *           The size content file to create
    * @throws IOException
    */
   private void createFileWithRepeatableContent(Directory dir, String fileName, final int contentFileSize) throws IOException {
      IndexOutput indexOutput = dir.createOutput(fileName);
      RepeatableLongByteSequence bytesGenerator = new RepeatableLongByteSequence();
      for (int i = 0; i < contentFileSize; i++) {
         indexOutput.writeByte(bytesGenerator.nextByte());
      }
      indexOutput.close();
   }

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